143 results about "Trachinotus ovatus" patented technology

The invention relates to a marine-fish environmental protective compound feed, consisting of the following materials in weight ratio: 13 to 20 portions of domestic fish powder, 8 to 15 portions of biological fish meal ABP600, 8 to 12 portions of soybean meal, 10 to 18 portions of peanut bran, 3 to 10 portions of corn, 3 to 7 portions of cotton seed meal, 3 to 7 portions of rapeseeds meal, 3 to 5 portions of meat and bone meal, 3 to 5 portionsof squid bowels powder, 20 to 30 portions of high gluten flour, 1.0 to 3.0 portions of blood meal, 1.0 to 2.0 portions of soybean lecithin, 2.0 to 3.0 portions of marine-fish oil, 0.3 to 0.6 portions of choline chloride (50%), 0.05 to 0.1 portions of Vitamin C phosphate (35%), 0.15 to 1.5 portions of calcium biphosphate, 0.2 to 0.5 portions of compound multiplex vitamin, 0.5 to 1.5 portions of compound mineral salt, 0.1 to 0.3 portions of feed attractant, 0.1 to 0.3 portions of micro-bio-preparation, 0.03 to 0.08 portions of A3Alpha peptidoglycan, 0.01 to 0.04 portions of phytase, and 0.04 to 0.08 portions of non-starch polysaccharase. The compound foodstuff can meet the nutrition demands of such high density cultivated marine fishes such as weever, large yellow croaker, American red fish, sparidae fishes, and trachinotus ovatus and rudd etc, and the cultivated objects can rapidly grow and has high foodstuff conversion rate; the compound foodstuff can intensify the immunity and anti-stress ability of fishes and endow them with good vitality, vivid body color and high survival rate; compared with marine fished cultivated by other foodstuffs, the excretion rates of nitrogen and phosphorous of the marine fishes cultivated by the compound foodstuffs is lowered by 10 to 15 percent, and cause smaller contamination to the cultivation water body.

The invention relates to a feed additive premix for low-salinity cultured marine fishes. The feed additive premix for the low-salinity cultured marine fishes consists of multi-vitamins and composite trace elements, and 20 to 30kg of feed additive premix is added into each ton of marine fish feed, wherein the multi-vitamins are 5 to 10kg and the composite trace elements are 15 to 25kg. Long-term tests of the low-salinity cultured marine fishes in the Pearl River Delta, such as trachinotus ovatus, Japanese sea bass, sciaenops ocellatus, sparus latus, sparus macrocephalus, latescalcarfer and the like, prove that the feed additive premix for the low-salinity cultured marine fishes has comprehensive nutrition and can meet the requirement of various marine fishes on total nutrition in a low-salinity culture environment; the feed additive premix is safe and high-efficiency, does not have any toxic or side effect, makes cultured objects grow rapidly and has high feed conversion rate and good culture benefit if taken for a long time; meanwhile, the additive can obviously enhance the immunologic function and anti-stress capability of the cultured objects, and the cultured marine fishes have high vigor, bright body color and high survival rate.

The invention relates to a feed additive, in particular to a feed promoting agent for seawater cultured fishes, which comprises the raw materials in weight ratio in the terms of addition per ton of feed: 300-1200g of crystal taurine, 300-1000g of L-glycine, 500-1000g of L-alanine, 500-1200g of L-glutamic acid, 800-1500g of L-aspartate, 500-3000g of betaine hydrochloride, 1000-2000g of dimethyl-beta-propiothetin (DMPT) crude powder and 1100-8000g of degreased condensed fish soluble protein powder. Proved by multiple culture tests in seawater fish feeds, such as Japanese sea bass, sciaenops ocellatus, trachinotus ovatus, garrupa and the like, the feed promoting agent for seawater cultured fishes is capable of remarkably enhancing the food intake of the seawater fishes to the composite feed by above 10 percent and quickening the intake speed as well as remarkably improving the stress-resisting capability of the cultured objects; and the cultured the seawater fishes have the advantages of high survival rate, bright color and strong stress resistance.

The present invention provides compound feed for the polyculture of Litopenaeus vannamei and Trachinotus ovatus and a preparation method thereof. The compound feed is characterized by comprising the following ingredients in parts by weight: 15-25 parts of fish meal, 5-10 parts of meat and bone meal, 1-5 parts of maggot powder, 15-25 parts of soybean meal, 5-10 parts of peanut bran, 1-5 parts of soybean protein concentrate, 1-5 parts of cottonseed meal, 1-5 parts of corn gluten meal, 1-3 parts of molasses yeast, 1-3 parts of corn DDGS, 1-3 parts of squid paste, 1-3 parts of shrimp shell powder, 20-25 parts of high-gluten flour, 1-2 parts of sea fish oil, 1-2 parts of soybean oil, 1-2 parts of soy lecithin, 0.5-1 parts of calcium dihydrogen phosphate, 0.1-0.3 parts of choline chloride, 0.1-0.3 parts of cholesterol, 0.05-0.1 parts of L-ascorbate-2-monophosphate, 0.1-0.3 parts of coated lysine, 0.1-0.3 parts of coated methionine, 0.1-0.3 parts of Bacillus subtilis, 0.1-0.3 parts of mannan, 0.1-0.5 parts of complex vitamins, 0.1-0.5 parts of complex mineral salts. Experiments show that the compound feed for the polyculture of Litopenaeus vannamei and Trachinotus ovatus of the present invention can effectively meet the comprehensive nutrient needs of both Litopenaeus vannamei and Trachinotus ovatus, significantly improves the effective utilization of the feed, and has a relatively low food coefficient.

The invention relates to disease-resistant highly-effective expanded compound feed for trachinotus ovatus. The feed is made of raw materials in the following weight ratios: imported steam fish meal 13-40, imported straight fire fish meal 10-30, biological fish meal ABP600 5-8, soybean meal 5-10, fermented soybean meal 5-8, soya meal 2-4, cotton seed meal 3-5, rape seed meal 3-5, meat and bone meal 3-8, cuttlefish meal 2-5, strong flour 25-33, blood meal 1.0-3.0, soybean lecithin 1.0-3.0, harp seal oil 2.0-5.0, choline chloride (5 percent) 0.4-1.0, vitamin C-phosphate ester (35 percent) 0.1-0.3, calcium dihydrogen phosphate 0.5-1.5, compound vitamins 0.2-0.5, compound mineral salt 0.5-1.5, phagostimulant 0.1-0.3, micro-ecological preparation 0.1-0.3, Beta-1,3 glucan 0.1-0.3, A3Alpha peptidoglycan 0.03-0.08, phytase 0.01-0.04, and non-starch polysaccharase 0.04-0.08. Cultivation experiments prove that the compound feed can meet all the requirements on nutrition of trachinotus ovatus cultivation in mesh cages and ponds, the cultivated trachinotus ovatus grow rapidly, the feed conversion rate is high, the color of the feed is vivid, the feed coefficient is between 1.8-2.1, the cultivation benefit is remarkable, the vitality of the cultivated trachinotus ovatus is good, the survival rate thereof is 6.0-10.5 percent higher than the survival rate when feed of other brands is used, and the death rate during long-distance transportation is reduced by over 60 percent.

The invention discloses a method for producing a microencapsulated starter diet for Trachinotus ovatus fries. The method comprises the following steps of: metering imported fish meal, soybean meal, shrimp meal, cuttlefish liver paste, flour and mineral substances, crushing, mixing uniformly, and feeding the mixture into an expanding machine and performing expansion pretreatment; performing ultrafine crushing after expansion pretreatment, wherein a crushed object is a core material; mixing spirulina, fish oil and various vitamins, dissolving in aqueous solution of gelatin, and homogenizing by using a colloid mill to obtain a product serving as a wall material coating; and preparing a microencapsulated bait from the wall material and the core material in a ratio of (1-10):100 by a spray drying method, screening the prepared microencapsulated bait according to particle sizes required by various growth periods of Trachinotus ovatus, packaging and warehousing. The method has the advantages that: through the experiment, the microencapsulated bait prepared from main raw materials which are subjected to expansion pretreatment and enveloping has good feeding attraction, is easy to digest and absorb, can effectively keep the stability and suspension property of a bait in water, and is favorable for the intake of the Trachinotus ovatus fries, so that the broad application prospect of the starter diet for the Trachinotus ovatus fries in marine fish feeds is opened up.

The invention discloses trachinotus ovatus juvenile compound feed with animal-vegetable compound protein replacing fish meal and a preparation method of the trachinotus ovatus juvenile compound feed,and relates to the field of component improvement of fish feed. The feed is prepared from fish meal, animal-vegetable compound protein, fat, tapioca starch, soybean lecithin, choline chloride, vitaminpremix, mineral premix, ethoxyquin, monocalcium phosphate, betaine, microcrystalline cellulose, L-lysine, L-methionine and L-arginine; the components are compounded in certain proportion according tothe principle of amino acid balance to obtain a protein source. Compared with existing trachinotus ovatus juvenile compound feed, the addition amount of fish meal in the feed formula disclosed by theinvention is reduced by 40%, and the feed cost is reduced by 11.6%; meanwhile, the weight gain rate of the trachinotus ovatus juvenile is increased by 16.7%, and the feed coefficient is reduced by 13.04%.

The invention discloses a trachinotus ovatus preservation processing technology which comprises the following steps: I, adding a protection liquid into a holding pond, covering the holding pond with a blue transparent PET (Polyethylene Terephthalate) film with fine holes, treating for 4-6 hours, further adding the protection liquid, covering the holding pond with a completely lightproof black PET film with fine holes, treating for 1-2 hours, removing the black PET film, storing for 1-2 hours, and conveying CO below the liquid level of the holding pond; II, freezing trachinotus ovatus for 2-5 minutes; III, cutting the trachinotus ovatus into fish slices, performing sterilization treatment in ozone water, and further soaking in a preservative solution for two times; IV, soaking in a color fasting liquid, treating in a magnetic field for 10 minutes, and washing with icy water; and V, performing quick freezing and frozen storage. The trachinotus ovatus preservation processing technology has the beneficial effects that after frozen storage for 90 days, the fish slices are still solid and elastic, flesh sections are still glossy, and after frozen storage for 360 days, the flesh can be still kept fresh, and the expiration date of the fish slices can be retarded.

The invention discloses a method for judging the sex of trachinotus ovatus at an early stage. Young trachinotus ovatus is selected, the left body wall is cut off, sex gland is found out, characteristics of the sex gland are observed in situ, the sex gland is taken out and dissected, the characteristics of the dissection face of the sex gland are observed, and the sex of the trachinotus ovatus is judged by analyzing the characteristics of the sex gland According to the method, the instrument is simple, operation is rapid, the result is accurate, toxic chemical agents are not used, the method for judging the sex of the trachinotus ovatus at the early stage is convenient to carry out efficient, and reliable materials can be provided for molecular marker research for further searching for sex specialty of the trachinotus ovatus.

The invention discloses an ssDNA nucleic acid aptamer and application thereof to detect pathogenic vibrio alginolyticus. The nucleotide sequence of the ssDNA nucleic acid aptamer is 5'-GACGCTTACTCAGGTGTGACTCGCGTTTTATTGGTGTGGGGCTGGGGCGGTGGGTGGCTCTACTGGTTCCGTTCGAAGGACGCAGATGAAGTCTC-3'(SEQ ID NO:1). The ssDNA nucleic acid aptamer is specific for and highly sensitive to the trachinotus ovatus source pathogenic vibrio alginolyticus, and has no immunogenicity. The ssDNA nucleic acid aptamer is stable in structure and easy to modify, facilitates synthesis and preservation, and can rapidly and accurately detect and diagnose the trachinotus ovatus source pathogenic vibrio alginolyticus.

The invention relates to a production method for cryptocaryon irritant prevention trachinotus ovatus seedlings, and belongs to the field of disease resistance fry production, and specifically relates to the field of cryptocaryon irritant prevention fry production. A method of varying temperature infection and varying temperature culture is firstly used to produce disease resistance trachinotus ovatus seedlings. Water temperature in infection and cultivation water temperature in 10 days after infection keep certain temperature difference, so as to enhance immune effect of cryptocaryon irritant live larva, to further combine with rotational culture. The method obtains cryptocaryon irritant prevention trachinotus ovatus seedlings in a relatively long effective immune protection period. In the eighth month after immunity, the seedlings still have relative protection rate of 52%, and in the ninth month, the seedlings still have relative protection rate of 28%.

The invention discloses an efficient growth-promoting mixed feed for Trachinotus ovatus, which comprises the following raw material components by mass percent: 0-40% of fish meal, 10-19% of bean pulp, 0-18% of corn protein powder, 10-24% of soybean protein concentrate, 7% of peanut pulp, 13.7-17.9% of flour, 3% of sleeve-fish visceral meal, 6.5-8.4% of fish oil, 1% of lecithin, 2% of vitamin complex, 2% of composite mineral, 0.5% of choline chloride, 0.1% of high-stability vitamin C, 0-1% of crystal lysine and 0-0.3% of crystal methionine. The mixed feed has good feeding promoting property, is balanced in nutrients, strong in disease resistance and high in digestivity, improves the culture survival rate, accelerates growth and can lower the feed coefficient.

The invention discloses a compound feed for promoting digestion and growth of trachinotus ovatus. The compound feed for promoting the digestion and growth of the trachinotus ovatus comprises the following components in percentage by weight: 27-32% of white fish meal, 14-22% of soybean protein concentrate, 7-9% of soybean meal, 4-7% of peanut meal, 23-27% of flour, 5.5-7% of soybean oil, 3-8% of fish oil, 0.85-1.2% of calcium dihydrogen phoshate, 0.85-1.0% of vitamin premix, 0.8-0.9% of mineral substance premix, 0.35-0.55% of choline chloride, 0.3-0.7% of lecithin and 0.03-0.04% of rhodotorula mucilaginosa. The compound feed for promoting the digestion and growth of the trachinotus ovatus has the advantages that food calling property is good, the nutrition is balanced, and the growth of the trachinotus ovatus can be obviously promoted; after feeding, the protein content of a trachinotus ovatus body is increased, the activeness of digestive ferments in liver and intestinal tracts is obviously enhanced, the digestion of protein and starch and the absorption and the utilization of the feed are promoted, and the economic benefit of breeding and ecological benefit of the environment can be increased.

The invention belongs to the field of aquaculture and relates to a method for preventing and controlling a shrimp infectious disease by using Trachinotus ovatus. The method comprises the following steps of: throwing 80,000 to 100,000 prawn seeds into per mu of a sea area with high-salinity seawater; and when each prawn is bred to be 0.3 to 0.7 gram, throwing 20 to 30 pieces of the Trachinotus ovatus into per mu of the sea area with high-salinity seawater, wherein each piece of the Trachinotus ovatus is 0.15 to 0.35 kilogram. A large number of tests prove that the Trachinotus ovatus of 0.15 to 0.35 kilogram eats the prawns dying of illness in a prawn culture pond, and the probability of eating the healthy prawns is very small due to the habits of the healthy prawns. The problem of low survival rate of the cultured prawns because the healthy prawns are eaten is solved.

The invention discloses a production method of seafood sauce. The seafood sauce is characterized by comprising 5g-10g of soybean sauce, 2g-3g of light soy sauce, 0.5g-1g of caraway juice, 0.5g-1g of ginger juice, 0-0.5g of garlic juice, 1g-2g of crab juice, 0.5g of chicken powder, 3g-4g of white sugar, 0.1g-0.2g of ground pepper, 2g-3g of oyster sauce, 2g-3g of sesame oil, 1g-2g of table salt and 20ml-30ml of trachinotus ovatus pureed soup. The production method of the seafood sauce is simple and convenient and can be matched according to different tastes; and meanwhile, the produced sauce is delicious and the appetite of people can be effectively stimulated.

The invention relates to a molecular biological method of identifying trachiontus ovatus. The method of identifying the trachinotus ovatus comprises steps as below: designing a general primer pair of perciformes fish; carrying out augmented sequencing of deoxyribonucleic acid (DNA) samples of common valuable and rare perciformes fish through the general primer pair; selecting unique DNA fragments of each kind of common valuable and rare perciformes fish according to the sequencing result; screening out one specific primer of the trachinotus ovatus out of the DNA fragments; matching one primer of the general primer pair with a specific primer of the trachinotus ovatus to form a specific primer pair of the trachinotus ovatus; carrying out augmentation of the samples of the common valuable and rare perciformes fish through the specific primer pair of the trachinotus ovatus; mixing the general primer pair with one specific primer pair of the trachinotus ovatus to form a mixed primer; carrying out augmentation of the DNA samples of fish needing to be identified by using the mixed primer pair; obtaining the species identification result of samples according to comparison between the electrophoretic band and the identification standard electrophoretic band.

The invention discloses a trachinotus ovatus sex specific molecular marker primer. The primer comprises a forward primer and a reverse primer, wherein a base sequence of the forward primer is as shownin SEQ ID NO: 1, and a base sequence of the reverse primer is as shown in SEQ ID NO: 2. The invention also discloses a method for identifying male and female of trachinotus ovatus by using the aboveprimer, and an application of the above primer or method in preparing a kit or biological preparation for identifying male and female of trachinotus ovatus. The primer has good specificity, and the identification method is convenient to operate, is simple and easy to implement, is high in identification success rate, does not harm the live body of trachinotus ovatus, can quickly and accurately identify the sex of trachinotus ovatus in batches at once, and has important scientific research value and practical application value.

The invention provides a culture method of selenium-enriched Trachinotus ovatus, and belongs to the technical field of aquaculture. The culture method comprises the following steps of disinfection, water culture, seedling dropping and culture. Culture cost of the Trachinotus ovatus is high due to the fact that the Trachinotus ovatus is fierce, food intake is large, growth is fast and stocking density is low. According to the culture method, the Trachinotus ovatus and shrimps are mixed to culture, the polyculture shrimps eat feed residue of the Trachinotus ovatus, water pollution is reduced, resources are reasonably utilized, and the Trachinotus ovatus culture cost is reduced. In addition, the reasonable feeding mode is combined with selenium-enriched feed, selenium contents of the shrimps and Trachinotus ovatus are increased, and resistance and edibleness of the Trachinotus ovatus are improved.

The invention discloses a trachinotus ovatus gender specific molecular marker primer. The primer is a primer P2 which comprises a forward primer P2-F and a reverse primer P2-R; and the base sequencesof the forward primer P2-F and the reverse primer P2-R are respectively as shown in SEQ ID NO: 1 and SEQ ID NO: 2. The invention also discloses a test kit used for gender determination of trachinotusovatus, and an application of the above-mentioned primer or the test kit in gender determination of the trachinotus ovatus. The primer provided by the invention is good in specificity, high in sensitivity and high in accuracy, does not harm trachinotus ovatus living bodies, can quickly and accurately identify the gender of the trachinotus ovatus in batches at a time, and has important scientific research value and practical application value.

The invention discloses a specific molecular marker primer for genders of trachinotus ovatus. The specific molecular marker primer is a primer P1 including a forward primer P1-F and a backward primerP1-R, and base sequences of the forward primer P1-F and a backward primer P1-R are respectively represented by SEQ ID NO:1 and SEQ ID NO:2. The invention further discloses a kit for identifying the genders of the trachinotus ovatus and application of the primer or the kit in identification of the genders of the trachinotus ovatus. The specific molecular marker primer is good in specificity and high in sensitivity and accuracy, is harmless to living trachinotus ovatus, can be used for rapidly and accurately identifying the genders of the trachinotus ovatus in batch at a time and has important scientific research values and practical application values.

The invention discloses a preparation method of trachinotus ovatus slices. The preparation method comprises the following steps: I, placing fish slices into ozone water for sterilization treatment, then immersing the fish slices into a passivation solution, feeding nitrogen, putting the fish slices into a preservative solution for soaking, performing drip washing, putting the fish slices into a preservative solution, in which no fish slices are soaked, for secondary soaking, and performing drip washing again; II, soaking the fish slices into a color protection solution, placing in a magnetic field for working, and performing drip washing again; III, refrigerating the fish slices under a condition of 4 DEG C, freezing the fish slices under a condition of -40 DEG C to -30 DEG C, placing the fish slices into spacer fluid for soaking in an iced water bath for 10 to 20 seconds, freezing the fish slices under a condition of -20 DEG C to -15 DEG C, then placing the fish slices into the spacer fluid for soaking in the iced water bath for 10 to 20 seconds, and freezing the fish slices under a condition of -40 DEG C to -30 DEG C; and IV, performing vacuumizing packaging and refrigeration. The preparation method has the beneficial effects that after the fish slices are refrigerated after 180 days, fresh fish meat taste, bright color and first-order freshness still can be kept, and the guarantee period is long.

The invention discloses a cDNA of a trachinotus ovatus thioredoxin gene. The nucleotide of the cDNA is as shown in the SEQ ID NO.1 in the description. The invention further discloses an expression vector containing the trachinotus ovatus thioredoxin gene, a recombinant microorganism transformed by utilizing the vector, and a method for preparing the trachinotus ovatus thioredoxin gene by utilizing the microorganism.

The present invention discloses a trachinotus ovatus body color improving compound feed which consists of the following components (in weight percentage): 30%-35% of white fish meal, 10%-14% of peanut meal, 8.5%-12% of soybean protein concentrate, 10.5%-13.5% of soybean meal, 14%-18% of wheat middling, 2%-5% of squid viscera powder, 3%-5% of beer yeast, 4%-8% of fish oil, 1.5%-2.5% of soybean lecithin, 0.65%-0.95% of choline chloride, 1.2%-2% of mineral substance premix, 1%-2% of vitamin premix and 2%-5% of spirulina. Feeding the trachinotus ovatus compound feed for about eight weeks can significantly improve the body color of the trachinotus ovatus, enable the trachinotus ovatus a closer body color to wild fish, effectively improve the commercial value of the trachinotus ovatus; and the compound feed has adequate nutrition, strong palatability, can meet all the nutritional needs of trachinotus ovatus under artificial breeding condition, has high feed utilization rate, stable source of used raw materials, and is conducive for industrial production; and at the same time, the feed preparation method is simple and convenient.

The present invention discloses an trachinotus ovatus with a formula feed by adding a squid paste to improve the feeding rate,including the following weight percentage of raw materials:27% - 28.5% of fish meal , 19.5% - 20% of soy protein concentrate, 8% - 9% of soybean meal, 6% of peanut meal, 22.2% - 23.6% of secondary powder, 7.8% - 7.9 % of fish oil, 2% of calcium dihydrogen phosphate, 1% of vitamin premix, 1% of mineral premix, 0.5% of choline chloride, 0.5% of lecithin, 1.5% - 3% of squid paste. The technical proposal of the invention improves the feeding rate of the trachinotus ovatus in the low fishmeal condition and the palatability of the feed by adding the squid paste to the common trachinotus ovatus feed;It is proved that the oval pomfret can be used to improve the feeding rate of oval pomfret and promote the growth of oval pomfret and improve the utilization rate of feed, At the same time to improve the oval pomfret disease resistance and antioxidant capacity, effectively reduce farming costs, improve farming income. It is proved that the trachinotus ovatus with a formula feed by adding a squid paste to reduce the fishmeal content of its formula, effectively improve the feeding rate of oval pomfret, promote the growth of oval pomfret, improve feed utilization, meanwhile, it can improve disease resistance of the trachinotus ovatus and antioxidant capacity, effectively reduce farming costs, improve farming income.

The invention relates to a low-carbon type trachinotus ovatus compound feed which mainly comprises brown fishmeal, shrimp powder, chicken powder, peeled bean pulp, peanut bran, cuttlefish liver powder, cottonseed protein powder, corn, strong flour, spray-dried animal blood cells, seawater fish oil, soyabean lecithin powder, soybean oil, tagetes erecta linn powder, choline chloride with the concentration being 50%, vitamin C phosphate, taurine, microecologics, high temperature resistant phytase, bile acid sodium, a phagostimulant, a monocalcium phosphate composite vitamin premix and a composite multi-mineral substance pre-mix. The compound feed is complete in nutrition, can meet the nutrition demands the trachinotus ovatus during the growth, has the characteristics of strong eating attraction, high palatability, low food coefficient and the like, and can excavate the growth potential of the trachinotus ovatus to the maximum extent, reduce the cultivation cost and improve the economic benefits.

The invention discloses a processing method for back-opened trachinotus ovatus, and belongs to the technical field of seafood preliminary processing. The processing method comprises keeping fresh of the raw material, and choosing; unfreezing and scaling; opening the back; removing cheek and removing viscera; sterilizing and cleaning; cleaning and draining water; singly freezing and cladding with ice cloth; weighing and putting in a disc; and packaging and refrigerating. According to the processing method for back-opened trachinotus ovatus, back-opened trachinotus ovatus is always at a low-temperature cold fresh state from transportation to processing and further to finished-product packaging, the delicious taste of trachinotus ovatus flesh is furthest kept, and by removing viscera and performing refrigeration processing on the whole trachinotus ovatus, trachinotus ovatus flesh keeps white and clean, and the whole trachinotus ovatus can be directly cooked through steaming in a clear soup or braising in soy sauce. The processed trachinotus ovatus is relatively high in nutrition value and economic value, and high-quality wild trachinotus ovatus can be sold far to inland areas.

The invention relates to fish feed premixes and in particular to a premix for preventing irritation gill damage of trachinotus ovatus as well as a preparation method and application of the premix. The premix is prepared from the following components in parts by weight: 5-10 parts of a motherwort extract, 15-35 parts of a bitter orange extract, 10-15 parts of a plantain herb extract and 0.1-0.5 part of composite synergism substances, wherein the composite synergism substances comprise mint leaf powder, calcium chloride, citric acid and gallnuts at a weight ratio of (100-130):(1-1.5):(1-2.5):(10-18). Compared with a nutrient premix used in a trachinotus ovatus feed, the premix has a remarkable prevention function on irritation gill damage of the trachinotus ovatus, is capable of effectively alleviating symptoms of irritation gill damage of the trachinotus ovatus and effectively reducing the death rate caused by irritation gill damage of the trachinotus ovatus as multiple active factors are obtained through a unique fermentation technique and the composite synergism substances are compounded to synergistically improve prevention effects.

The invention discloses a trachinotus ovatus fattening feed capable of protecting livers and intestines and a preparation method thereof. Puerarin and protocatechuic acid are combined with compoundedvitamin, compounded minerals, amino acid and a high-temperature resistance micro-ecology preparation to achieve synergistic interaction; the feed has balanced nutrition and can improve liver lipid metabolism, reduce slight oxygen damage, adjust intestinal flora balance and reinforce the body immunity of trachinotus ovatus, and the significant effect of protecting trachinotus ovatus liver and intestine health is comprehensively achieved; in addition, by adopting a vacuum freeze-drying technology, Chinese herbal medicine extract, the compounded vitamin, mixed oil and the like do not suffer fromhigh-temperature oxidative deterioration, the feed is high in effective component content and good in rehydration rate, the situation is avoided that trachinotus ovatus is fed with a large amount of dry feed, and the pressure on the digestive system of trachinotus ovatus is reduced; through an oil out-spray technology and a fat regulation technology and by adding shrimp meal and corn gluten meal,the trachinotus ovatus fattening feed also has a good food calling effect, bred trachinotus ovatus is rapidly fattened and comes into the market, the shape and color of bred trachinotus ovatus are close to those of wild trachinotus ovatus, and therefore bred trachinotus ovatus is popular in the market.