Method for domesticating eleutheronema tetradactylum to eat artificial compound feed

Abstract

The invention discloses a method for domesticating eleutheronema tetradactylum to ingest artificial compound feed, which comprises the following steps: (1) domesticating food: domesticating and ingesting artificial compound feed with different specifications at different growth and development stages from 0.7-0.8 cm of fry; (2) screening: screening the domesticated and ingestion eleutheronema tetradactylum for three times to obtain domesticated fishes which are high in adaptability to artificial compound feed and high in ingestion speed; (3) carrying out artificial breeding on the domesticated fish, and repeating the operations of the step (1) and the step (2) on filial generations; through two generations of domestication and screening, an improved eleutheronema tetradactylum breed capable of ingestion of artificial compound feed in the whole process is obtained, larvae of eleutheronema tetradactylum can be directly and completely fed with the artificial compound feed after being transited from ingestion of plankton bait to normal ingestion of the compound feed, and domestication is not needed. The obtained eleutheronema tetradactylum fine breed covers the whole industry, the condition of feeding chilled trash fish for breeding is changed, the low-carbon, efficient and green breeding effect is achieved, and industrial development is greatly promoted.

Description

Technical Field

[0001] The invention belongs to the technical field of fish breeding, and particularly relates to a method for taming four-fingered threadfin bream to eat artificial compound feed. Background Art

[0002] Four-finger threadfin mackerel (Elentheronema tetradactylum), commonly known as Elentheronema tetradactylum, is distributed in the Indian Ocean and the western Pacific Ocean. It is found along the coast of my country, especially in the south. It is a tropical and temperate marine fish. The fish has thick meat, few bones, good taste and rich nutrition. Due to its high economic value and strong market demand, it has become a precious seafood in my country. However, in recent years, due to overfishing, the resources of four-finger threadfin mackerel have declined significantly, and coupled with the deterioration of the marine environment, its resources have declined more rapidly.

[0003] In 2012, the South China Sea Fisheries Research Institute of the Chinese Academy of Fishery Sciences was the first in China to break through the large-scale artificial breeding and farming technology of four-fingered mackerel; however, four-fingered mackerel is a carnivorous fish with voracious nature. Under natural conditions, wild individuals mainly feed on young fish, followed by larger organisms such as isopods, shrimps and squids. Therefore, in the early stage of research and development, wild fish and ice-fresh fish need to be used as bait, which means that the breeding and farming costs of four-fingered mackerel are relatively high, and it also limits the expansion and promotion of four-fingered mackerel farming. In addition, feeding ice-fresh fish has a great impact on water quality and puts pressure on the farming environment; ice-fresh fish contain bacteria and parasites, which increases the risk of disease in fry and farmed fish.

[0004] Therefore, it is a major trend in the industry to innovate breeding and production technology, domesticate carnivorous fish such as the family Threadfin to eat artificial compound feeds instead of wild fish and fresh ice fish, create favorable conditions for the development of threadfin fry breeding and production towards high efficiency and sustainability, and realize the industrialization of deep-sea breeding. However, the traditional method of domesticating carnivorous fish to eat artificial compound feeds requires domestication in each breeding cycle, which increases the breeding cost; in other words, domestication must be repeated each time the fry are cultured. Therefore, at the beginning of studying the large-scale breeding and breeding technology of threadfin fry, the present invention studies the scheme of domesticating four-fingered threadfin fry to eat artificial compound feed, which not only achieves the purpose of domestication, but also solves the problem that domestication is required in each breeding cycle in the traditional method. Summary of the invention

[0005] The purpose of the present invention is to provide a method for taming four-fingered threadfin bream to eat artificial compound feed, so as to obtain improved four-fingered threadfin bream with the characteristic of eating artificial compound feed 100% throughout the whole process.

[0006] To achieve the above objectives, the present invention adopts the following technical solutions.

[0007] A method for domesticating the fourfinger threadfin Eleutheronema tetradactylum to feed on artificial compound feed, comprising the following steps:

[0008] (1) Feeding training:

[0009] a. From the time when the fry start to feed until they reach a total length of 0.7 cm to 0.8 cm, mainly feed live animal baits such as rotifers and copepods; starting from 0.7 cm to 0.8 cm, supplement with fish fry opening powder to train the fry to gradually start feeding on artificial compound feed; the feeding proportion of the fish fry opening powder is gradually increased until it finally replaces the live bait and mainly feeds on the opening powder;

[0010] b. When the fry grow to a total length of 1.0 cm to 1.2 cm, start feeding commercially available seawater fish opening feed with a protein content of more than 45%, and at the same time feed floating wet feed in a lump shape to train the fry to bite by themselves;

[0011] c. At different growth stages of juvenile fish, young fish and adult fish, timely replace artificial compound feeds of different specifications, adjust the feeding proportion of the artificial compound feed, and at the same time, according to the situation of the fish feeding on the artificial compound feed, supplement with fish mince or fish meat;

[0012] (2) Screening:

[0013] a. When the fourfinger threadfin Eleutheronema tetradactylum is fed with artificial compound feed until it reaches 240 - 250 g, conduct the first screening, and the excellent selection rate is 20%; the screening indicators are strong adaptability to artificial compound feed, specifically fast feeding speed, fast growth speed, good fatness, high meat yield, bright body color and healthy physique;

[0014] Culture the fish with excellent traits screened out in a special pond and continue to feed them with artificial compound feed;

[0015] b. When the fish cultured in the special pond grow to about 500 g, conduct the second screening, and the excellent selection rate is 50%, and select the best from the excellent according to the aforementioned screening indicators;

[0016] The fish with excellent traits screened out continue to be cultured in a special pond;

[0017] c. When the fish cultured in the special pond grow to about 1000 g, conduct the third screening according to the aforementioned screening indicators; the excellent selection rate for the third time is 80%;

[0018] The fish that can completely feed on and adapt to artificial feed after three screenings are transferred to the reserve broodstock pond and cultured in a special pond as reserve broodstock;

[0019] (3) Offspring breeding:

[0020] When culturing reserve broodstock in a dedicated pond, artificial compound feed is fed throughout the whole process, and nutritional fortified feed is supplemented during the mature stage of the broodstock; after the broodstock spawns and hatches, the feeding training operation in step (1) and the screening operation in step (2) are repeated.

[0021] After two complete generations of feeding training, screening and breeding, when the offspring bred from the obtained broodstock transition from feeding on planktonic bait to normal feeding of compound feed, compound feed can be directly fed, and they have the characteristic of 100% full-course feeding on artificial compound feed.

[0022] The offspring of Eleutheronema tetradactylum domesticated by the method of the present invention have the characteristic of 100% full-course feeding on artificial compound feed, and can be completely fed with artificial compound feed without supplementing with fish mince or fish meat.

[0023] Preferably, in step (1), 7 - 10 days before fry stocking, a water cultivating agent is used for whole-pond spraying to fertilize the water to cultivate sufficient biological bait, and fry can be stocked after the biological bait reproduction reaches the peak.

[0024] Preferably, the fry starter powder contains components such as high-quality fish meal, α-starch, probiotics, attractants, fish oil, and vegetable dry powder. Therefore, it is rich in highly unsaturated fatty acids, various vitamins, abundant calcium and phosphorus, with a protein content of more than 46%. The plant protein and animal protein are evenly matched, which can effectively help the fry digest and promote the development of the fry; the raw materials of the vegetable dry powder include eggplant, cauliflower, radish, spinach, and broccoli; the attractants include but are not limited to umami amino acids and umami oligopeptides, which have good fragrance and palatability and good attractant properties; α-starch makes the feed have good adhesiveness, reduces the loss of fish meal in water, and does not pollute the water quality.

[0025] The dough-like floating wet feed is prepared by mixing the fry starter powder with water and kneading it into a dough. It has good adhesiveness, floating property, flexibility, elasticity and palatability, is easy to bite, and is not easily soluble in water, reducing losses. Preferably, the dough-like floating wet feed is also mixed with probiotics and active polysaccharides. Specifically, the dough-like floating wet feed is prepared by mixing 500 grams of "Dingru Shuangtai" strain and 500 grams of "active polysaccharide" with every 100 catties of the fry starter powder, then adding water and kneading it into a dough.

[0026] Preferably, in step (1), sampling is carried out at different growth stages of juvenile fish, young fish and adult fish, morphological measurement and histological dissection are performed, and according to the morphological and histological changes of the morphological measurement, mouth diameter size and digestive tract structure of the fish, artificial compound feeds of different specifications are replaced in a timely manner, and the feeding ratio of the artificial compound feed is adjusted; specifically, when the fish grows further and the mouth diameter becomes larger, the corresponding specification of pellet feed should be replaced in time. At the same time, observe the feeding situation of Eleutheronema tetradactylum on artificial compound feed during each feeding. When its feeding on artificial compound feed is not active and the amount of artificial compound feed eaten is less than the normal feeding amount, it is necessary to supplement with an appropriate amount of fish mince or fish meat. The specific feeding amount of fish mince or fish meat can be 30-80% of the total feeding amount. When Eleutheronema tetradactylum actively grabs artificial compound feed, and sampling confirms that the percentage of intestinal length to body length (intestinal length ratio) of the fish becomes larger, the intestinal wall thickens significantly, and the mucosal folds on the inner surface of the digestive tract become more, higher and narrower, the feeding should be adjusted to 100% artificial compound feed, and fish mince or fish meat should no longer be supplemented.

[0027] Compared with the prior art of the present invention, the present invention has the following beneficial effects:

[0028] (1) At the beginning of the research on the large-scale breeding and cultivation technology of Eleutheronema tetradactylum fry, the research team of the present invention studied and formulated a method and screening plan for domesticating Eleutheronema tetradactylum to feed on artificial compound feed. After two complete generations of domestication and breeding, a good variety of Eleutheronema tetradactylum with the characteristic of feeding on artificial compound feed throughout the whole process with 100% was obtained, successfully replacing the feeding of live bait such as juvenile fish and frozen fresh fish, so that Eleutheronema tetradactylum does not need to be fed with live bait during the whole cultivation cycle; moreover, the Eleutheronema tetradactylum fed with artificial compound feed has no difference in growth performance, fatness and meat quality compared with Eleutheronema tetradactylum fed with juvenile fish and frozen fresh fish, and is even better. The good variety of Eleutheronema tetradactylum with the characteristic of feeding on artificial compound feed throughout the whole process with 100% obtained by the method of the present invention has been popularized in the industry, and currently, the whole Eleutheronema tetradactylum breeding and cultivation industry feeds compound feed.

[0029] (2) After domestication and selection, the digestive system of the obtained Eleutheronema tetradactylum has enhanced digestion of compound feed, and its digestive function has transformed into omnivorous. After the larval stage of its offspring feeds on planktonic bait, it can be directly and completely fed with artificial compound feed without going through a complex and time-consuming domestication process.

[0030] (3) The present invention successfully domesticates Eleutheronema tetradactylum to feed on artificial compound feed, avoiding the cost waste caused by unbalanced nutrients in feeding frozen fresh fish and other live bait, making the proportion of various nutrients in the feed appropriate, fully meeting the nutritional needs of different growth stages, and maximizing the production potential of Eleutheronema tetradactylum; at the same time, avoiding the negative impacts of feeding frozen fresh fish and other live bait, reducing the occurrence of fish diseases, and reducing the impact of cultivation on the environment.

[0031] (4) The present invention has successfully domesticated the four - finger threadfin (Eleutheronema tetradactylum) to feed on artificial compound feed, which simplifies the production labor of farmers and saves the input of labor and equipment in aquaculture farms.

[0032] (5) The present invention has successfully domesticated the four - finger threadfin to feed on artificial compound feed, enabling enterprises to make full use of the leftovers from the oil - pressing industry, grain - processing industry, slaughter industry, fermentation and brewing industry, pharmaceutical industry, etc., promoting the development of feed resources, saving grain, and reducing feed costs.

[0033] (6) Through multiple generations of domestication and screening, the present invention has changed the carnivorous habit of the four - finger threadfin and obtained fine varieties of the four - finger threadfin with omnivorous characteristics and the ability to feed on artificial compound feed throughout the whole process. After the breeding and cultivation of the four - finger threadfin change from feeding on planktonic biological bait by fry to normal feeding on compound feed, they can be directly and completely fed with artificial compound feed without going through a complex and time - consuming food - training process. The fine varieties of the four - finger threadfin obtained by the present invention have been popularized and now cover the whole industry, changing the situation of feeding fresh and live bait in the four - finger threadfin aquaculture, optimizing the aquaculture technology, achieving the aquaculture effects of low - carbon, high - efficiency, green, and ecological, and greatly promoting the development of the industry. Detailed implementation manners

[0034] To more clearly illustrate the technical solutions of the present invention, the following examples are listed for description.

[0035] Example 1

[0036] The steps for domesticating the four - finger threadfin to feed on artificial compound feed are as follows:

[0037] (1) Food - training:

[0038] a. 7 - 10 days before fry stocking, use the water - cultivating agents "Zhuduobao" and "Beijiamei" sold by the South China Sea Fisheries Research Institute. Stir them evenly at a combined dosage of 5 kg each per 10 - 15 mu of water surface and then splash them all over the pond to fertilize the water and cultivate sufficient biological bait. After the reproduction of biological bait reaches the peak, fry of the four - finger threadfin hatched for 2 - 3 days can be stocked. From the time when the fry start to feed until their total length reaches 0.7 cm - 0.8 cm, the fry mainly feed on animal live biological bait such as rotifers and copepods in the water.

[0039] Starting from fry with a length of 0.7 cm to 0.8 cm, supplemented by feeding fry opening powder to train the larvae to gradually start feeding on artificial feed; the fry opening powder contains components such as high-quality fish meal, α-starch, probiotics, attractants, fish oil, and vegetable dry powder, so it is rich in highly unsaturated fatty acids, various vitamins, abundant calcium and phosphorus, with a protein content of more than 46%, and a balanced combination of plant protein and animal protein, effectively helping the larvae digest and promoting the development of the larvae; the raw materials of the vegetable dry powder include various vegetables such as eggplant, cauliflower, radish, spinach, and broccoli; adding umami amino acids, various amino acids, and small peptides as attractants has a good aroma and palatability, and good attractiveness; α-starch makes the feed have good adhesiveness, reduces the loss of fish meal in water, and does not pollute the water quality.

[0040] Feed three times a day, at 6 am, 11 am, and 5 pm respectively; the feeding method of the self-made opening powder is: use a long-handled small spoon to sprinkle the fish meal on the pond water surface to train the larvae to gradually start feeding on artificial feed; the feeding amount should be such that the fish can finish eating immediately each time, and the proportion of the self-made opening powder fed is increased day by day until mainly feeding on the opening powder.

[0041] b. When the fry grow to a total length of 1.0 cm to 1.2 cm, start feeding commercially available powdered seawater fish opening feed with a protein content of more than 45%, feed three times a day, at 6 am, 11 am, and 5 pm respectively; at the same time, cooperate with feeding floating wet feed in a mass to train the fry to bite by themselves;

[0042] Among them, the preparation method of the floating wet feed in a mass is: add 500 grams of the strain "Dingru Shuangtai" produced by the South China Sea Fisheries Research Institute and 500 grams of "active polysaccharide" to every 100 catties of fry opening powder, then mix with water and knead into a mass; the prepared floating wet feed in a mass has good adhesiveness, floating property, flexibility, elasticity, and palatability, is easy to bite, is not easily soluble in water, and reduces losses.

[0043] The feed is regularly and fixedly put into the water surface of the fry pond; after the first powder feeding, place the floating wet feed in a mass in a small floating frame of 400 mm × 400 mm at a fixed point, and let the fry freely bite. The floating frame is towed by a nylon rope on a bamboo pole by the pool side.

[0044] c. At different growth stages of juvenile fish, young fish, and adult fish, sample, conduct morphological measurements and histological dissections, and formulate different feeding strategies according to the morphological and histological changes of the fish's morphological measurements, mouth diameter size, and digestive tract structure, and timely replace artificial compound feeds for seawater fish of different specifications and adjust the feeding ratio of the artificial compound feeds; that is, when the fish grows further and the mouth diameter becomes larger, the corresponding granular feed of the appropriate specification should be replaced in a timely manner;

[0045] Specifically, in this embodiment, the feed specifications corresponding to fish of different specifications are roughly as follows:

[0046] ① For juvenile and young fish with a body weight of less than 10 g, feed them with powder feed or microcapsule feed with a particle size of 0.5 mm to 1.5 mm;

[0047] ② When the total length is 10 cm to 30 cm, select and feed expanded pellet feed with a particle size of 3.0 mm;

[0048] ③ When the total length is more than 30 cm, switch to feeding expanded pellet feed with a particle size of 5.0 mm.

[0049] Adjust the feeding frequency at this stage to 2 times a day, once at 7:00 - 8:00 am and once at 17:00 - 18:00 pm; observe the feeding situation of Eleutheronema tetradactylum on artificial formulated feed during feeding. When its feeding on artificial formulated feed is not active and the amount of artificial formulated feed ingested is less than the normal feeding amount, supplement with an appropriate amount of fish mince or fish meat, and the proportion of fish mince or fish meat in the total feed amount varies from 30% to 80%, and make flexible adjustments according to the active situation of the fish feeding on artificial formulated feed.

[0050] When Eleutheronema tetradactylum actively grabs artificial formulated feed, and the percentage of intestinal length to body length (intestinal length ratio) of the fish sampled and confirmed becomes larger, the intestinal wall thickens significantly, and the mucosal folds on the inner surface of the digestive tract become numerous, high, and narrow, it should be adjusted to 100% feeding of artificial formulated pellet feed, and no longer supplement with fish mince or fish meat.

[0051] That is, in this embodiment, during the initial feeding training, at different growth stages of juvenile, young, and adult fish, in addition to timely replacing artificial formulated feed for seawater fish of different specifications, it is also necessary to supplement with an appropriate amount of fish mince or fish meat, and the proportion of fish mince or fish meat varies from 30% to 80%, and make flexible adjustments according to the active situation of the fish feeding on the feed; when the percentage of intestinal length to body length (intestinal length ratio) of the fish becomes larger, the intestinal wall thickens significantly, and the mucosal folds on the inner surface of the digestive tract become numerous, high, and narrow, the digestive function of the digestive system on the formulated feed is enhanced, and the digestive function of the fish has transformed into omnivorous. At this time, it should be adjusted to 100% feeding of pellet feed, and there is no need to supplement with fresh live bait.

[0052] (2) Screening:

[0053] a. When the above-mentioned Eleutheronema tetradactylum is fed with artificial formulated feed until its body weight reaches about 250 g, conduct the first screening, and the excellent selection rate is 20%.

[0054] The screening index is strong adaptability to artificial formulated feed, specifically fast feeding speed, fast growth speed, good fatness, high meat yield, bright body color, and healthy physique. Sample and dissect the selected fish. Compared with the non-domesticated control group, the percentage of intestinal length to body length (intestinal length ratio) of the domesticated fish becomes larger, the intestinal wall thickens significantly, and the mucosal folds on the inner surface of the digestive tract become numerous, high, and narrow;

[0055] The selected fish with excellent traits are cultured in a dedicated pond and continue to be trained to eat artificial compound feed.

[0056] b. When the fish cultured in the dedicated pond grow to about 500 g in weight, a second screening is carried out.

[0057] The optimal selection rate is 50%; the best are selected from the excellent according to the aforementioned screening indicators.

[0058] The selected fish with excellent traits are continued to be cultured in a dedicated pond.

[0059] c. When the selected fish grow to 1000 g, a third screening is carried out according to the aforementioned screening indicators; the retention ratio for screening is 80%.

[0060] The selected fish that can completely eat and adapt to artificial feed are transferred to the reserve broodstock pond and cultured in a dedicated pond as reserve broodstock.

[0061] (3) Offspring breeding:

[0062] During the dedicated pond culture of reserve broodstock, artificial compound feed is fed throughout the whole process; when the gonads of the broodstock reach the mature stage, while feeding artificial compound feed, vitamin E and vitamin C are appropriately increased.

[0063] After the broodstock are mature, lay eggs and hatch, repeat the feeding training operation in step (1) and the three screening operations in step (2);

[0064] After two complete generations of feeding training, screening and breeding, after the offspring of the obtained broodstock transition from feeding on planktonic biological bait to normally feeding on artificial compound feed, they can be directly and completely fed with artificial compound feed without going through a gradual feeding training process, and have the characteristic of 100% full-course feeding on artificial compound feed.

[0065] (4) Using the method of the present invention to domesticate Eleutheronema tetradactylum to eat artificial compound feed, through sampling and determination at each stage, the following scientific findings are obtained:

[0066] a. Morphological and anatomical characteristics: After multiple generations of feeding training and screening, the fish have a significant omnivorous tendency, and the percentage of intestinal length to body length (specific intestinal length) becomes larger.

[0067] b. Histological characteristics: After multiple generations of feeding training and screening, compared with the fish without feeding training and screening, the intestinal wall of the fish is significantly thickened, and the mucosal folds on the inner surface of the digestive tract become more, higher and narrower.

[0068] Example 2

[0069] After multiple generations of feeding training and screening of the fish in Example 1, the artificial breeding population of the fish already has the excellent trait of omnivory and can be completely fed with artificial compound feed without further feeding training. The daily feeding management technology is as follows:

[0070] a. Seven to ten days before releasing the fry, use the water quality improvers "Zhuduobao" and "Beijiamei" sold by the South China Sea Fisheries Research Institute. Mix them evenly at a combined dosage of 5 kg each for every 10 - 15 mu of water surface and then splash them all over the pond to fertilize the water and cultivate sufficient live biological baits such as rotifers. After the reproduction of the biological baits reaches its peak, fry of Eleutheronema tetradactylum that have hatched for 2 - 3 days can be released. From the time the fry start feeding until their total length reaches 0.7 cm - 0.8 cm, the fry mainly feed on live animal biological baits such as rotifers and copepods, and no additional feeding is required.

[0071] b. Starting from 0.7 cm - 0.8 cm in total length, supplement with commercially available fry starter powder or eel powder, etc., and feed 3 times a day, at 6 am, 11 am, and 5 pm respectively. The feeding method is to use a long - handled small spoon to splash the powder onto the pond water surface, and the feeding amount should be such that the fish can finish it immediately each time.

[0072] c. When the fry grow to a total length of 1.0 cm - 1.2 cm and have transitioned from feeding on planktonic biological baits to normal feeding on artificial compound feeds, they can be directly fed commercially available seawater fish feeds or self - made compound feeds according to daily feeding management.

[0073] The feed specifications corresponding to fish of different specifications are roughly as follows:

[0074] ① When the total length is 1.0 cm - 1.2 cm, feed powdered seawater fish starter feed with a protein content of more than 45%.

[0075] ② For juvenile and young fish with a body weight of less than 10 g, feed powder or micro - encapsulated feed with a particle size of 0.5 mm - 1.5 mm.

[0076] ③ When the total length is 10 cm - 30 cm, choose to feed expanded pellet feed with a particle size of 3.0 mm.

[0077] ④ When the total length is more than 30 cm, switch to feeding expanded pellet feed with a particle size of 5.0 mm.

[0078] Throughout this example, no fresh baits such as fish mince or fish meat need to be fed, and artificial compound feeds are used to replace fresh baits. Moreover, the cultured Eleutheronema tetradactylum has basically no difference in growth performance, condition factor, and meat quality compared with those fed with frozen miscellaneous fish in the past. Since no fresh baits need to be fed in this example, the occurrence of fish diseases is reduced, the yield of Eleutheronema tetradactylum is increased to a certain extent, and the breeding cost is reduced without the need for domestication, thus improving the breeding efficiency.

[0079] The above embodiments have elaborated on different implementation processes of the present invention in detail. However, the implementation manners of the present invention are not limited thereto. Those of ordinary skill in the art can achieve the purpose of the present invention based on the content disclosed in the present invention. Any improvements and modifications made based on the concept of the present invention fall within the protection scope of the present invention.

Claims

1. A method for taming four-fingered threadfin bream to eat artificial compound feed, characterized in that: The following steps are involved: (1) Food Taming: a. From the time the fry start to eat until they are 0.7cm to 0.8cm in length, they are mainly fed with live biological baits of rotifers and copepods; from 0.7cm to 0.8cm, they are supplemented with feeding fish flower starter feed to train the fry to slowly start eating artificial compound feeds; the feeding ratio of fish flower starter feed is gradually increased, and eventually biological baits are replaced and the starter feed is mainly fed; b. When the fry grow to a total length of 1.0cm to 1.2cm, start feeding them with marine fish starter feed with a protein content of more than 45%, and at the same time feed them with floating wet feed in a ball shape to train the fry to bite and feed on their own; c. At different growth stages of juveniles, young fish and adult fish, timely change the artificial feeds of different specifications and adjust the feeding ratio of artificial feeds. At the same time, feed fish paste or fish meat according to the fish's intake of artificial feeds; (2) Screening: a. When the four-fingered threadfin bream is fed with artificial compound feed to 240-250g, the first screening is carried out, and the preferential screening rate is 20%; the screening index is strong adaptability to artificial compound feed, specifically fast feeding speed, fast growth rate, good fatness, high meat yield, bright body color and healthy physique; The selected fish with good traits are cultured in special ponds and continue to be fed with artificial compound feed; b. When the fish in the special pond grow to about 500g, a second screening is conducted, the selection rate is 50%, and the selection is carried out according to the aforementioned screening indicators; The fish selected for excellent traits continue to be cultured in special ponds; c. When the fish in the special pond grow to about 1000g, the third screening is carried out according to the aforementioned screening indicators; the third selection rate is 80%; The fish that have been screened three times and can fully eat and adapt to artificial feed are transferred to the reserve broodstock pond and cultivated as reserve broodstock in a special pond; (3) Offspring breeding: The reserve broodstock are fed with artificial compound feeds throughout the whole process of cultivation in the special pond, and are supplemented with nutritionally fortified feeds during the mature stage of the broodstock; after the broodstock lay eggs and hatch, the feeding operation of step (1) and the screening operation of step (2) are repeated; After two complete generations of domestication, screening and breeding, the offspring of the resulting bred fish transition from feeding on plankton bait to feeding on compound feed normally, and can then be fed directly with compound feed, with the characteristic of consuming 100% artificial compound feed throughout the entire process.

2. The method for taming four-fingered threadfin bream to eat artificial compound feed according to claim 1, characterized in that: In step (1), samples are collected at different growth stages of juveniles, young fish and adult fish, and morphological measurements and histological dissections are performed. According to the morphological measurements, mouth sizes and morphological and histological changes of the digestive tract structure of the fish, different specifications of artificial compound feeds are replaced in a timely manner, and the feeding ratio of the artificial compound feeds is adjusted; specifically, when the fish grows further and the mouth size becomes larger, the granular feed of the corresponding specifications should be replaced in a timely manner.

3. The method for taming four-fingered threadfin bream to eat artificial compound feed according to claim 2, characterized in that At different growth stages of juveniles, young fish and adult fish, observe the feeding situation of four-fingered threadfin fry in artificial compound feed every time feeding. When it is not active in eating artificial compound feed, and the amount of artificial compound feed eaten is less than the normal feeding amount, it is necessary to feed it with fish paste or fish meat, and the specific amount of fish paste or fish meat fed is 30-80% of the total feeding amount. When the four-fingered threadfin fry actively eats artificial compound feed, and sampling confirms that the percentage of the fish's intestine length to body length increases, the intestinal wall is obviously thickened, and the mucosal folds on the inner surface of the digestive tract become more numerous, high and narrow, it should be adjusted to 100% feeding of artificial compound feed, and no longer feed fish paste or fish meat.

4. The method for taming four-fingered threadfin bream to eat artificial compound feed according to claim 3, characterized in that: The fish flower powder contains fish meal, alpha starch, probiotics, attractants, fish oil, and vegetable dry powder, and its protein content is more than 46%; the raw materials of the vegetable dry powder include eggplant, cauliflower, radish, spinach, and broccoli.

5. The method for taming four-fingered threadfin bream to eat artificial compound feed according to claim 4, characterized in that: In step (1), 7 to 10 days before stocking, a water cultivation agent is sprayed throughout the pond to cultivate sufficient biological bait, and the stocking can be carried out after the biological bait reproduction reaches its peak.

6. The method for taming four-fingered threadfin bream to eat artificial compound feed according to claim 5, characterized in that: The ball-shaped floating wet feed is prepared by mixing the fish flower opening powder with water and kneading them into a ball; the ball-shaped floating wet feed is also mixed with probiotics and active polysaccharides.