Puffed floating feed for pomfret in growing period and preparation method of puffed floating feed

Abstract

The invention belongs to the technical field of pomfret breeding, and particularly relates to puffed floating feed for a pomfret breeding period and a preparation method of the puffed floating feed. The puffed floating feed is prepared from the following raw materials in parts by weight: 35 to 45 parts of Peru super brown fishmeal, 6 to 16.6 parts of chicken meal, 3 to 6 parts of enzymolysis chicken slurry, 5 to 9 parts of whole egg powder, 7 to 13 parts of rice protein powder, 9 to 12 parts of corn starch, 3.2 to 5 parts of sardine fish oil, 1 to 5 parts of schizochytrium limacinum oil, 0.6 to 1.5 parts of compound amino acid and 1.5 to 2.5 parts of a macroelement premix. 1.0 to 1.5 parts of trace element premix, 0.4 to 1.0 part of vitamin premix and 4.3 to 4.9 parts of bacterium enzyme oil compound. The puffed floating feed for the pomfret in the breeding period has the effects of high feeding rate, high survival rate, high growth speed and high fatness, can meet the growth requirements of the pomfret in the breeding period, and improves the quality and specification of fishes on the market.

Description

Technical Field

[0001] The invention belongs to the technical field of silver pomfret breeding, and particularly relates to an expanded floating feed for silver pomfret during the grow-out period and a preparation method thereof. Background Art

[0002] The silver pomfret is a warm-water pelagic fish of the family Pomfretidae in the order Perciformes. It ranges from 85 mm to 260 mm in length, with a short, tall, and laterally compressed body that is slightly diamond-shaped. It has a small, slightly oblique mouth, no ventral fins, and a deeply forked caudal fin. Its lower lobe is longer than the upper, resembling a swallow's tail. Its body is silvery-white with a slight yellow-gray tint above. Its scales are very small, and most are dotted with tiny black dots. Its name stems from its silvery-white color.

[0003] Silver pomfret has an underdeveloped stomach, numerous pyloric caeca, a high intestinal index, and a unique esophageal lateral sac structure, making it a carnivorous, omnivorous species. In natural waters, wild silver pomfret prefers to chase and nibble on floating bait such as jellyfish at the surface. In captivity, it has also been found to prefer feeding in the upper layers of the water, disliking food that sinks to the bottom.

[0004] Currently, silver pomfret are fed a slow-sinking flounder feed on aquaculture vessels, and in factory farming, they are periodically fed a slow-sinking flounder feed or wet pellet feed. However, silver pomfret have poor stress tolerance and are intolerant to high temperatures. During the farming process, feeding these feeds results in low feeding rates, low survival rates, and slow growth. Therefore, there is still a lack of specialized feeds tailored to the habits of silver pomfret, and there is an urgent need to develop a feed tailored to these characteristics to address these issues. Summary of the Invention

[0005] To address the existing problems with silver pomfret feeds, which often result in low feeding rates, survival rates, and growth, the present invention aims to develop a specialized compound feed tailored to the habits of silver pomfret. This invention also provides an expanded, floating feed for silver pomfret growout and a method for preparing it. To achieve this objective, the present invention employs the following technical solutions.

[0006] The present invention provides an expanded floating feed for silver pomfret during the grow-out period. The expanded floating feed for silver pomfret during the grow-out period is prepared from the following raw materials in parts by weight: Peruvian super red fish meal 35-45 parts, chicken meal 6-16.6 parts, enzymatic chicken pulp 3-6 parts, whole egg powder 5-9 parts, rice protein powder 7-13 parts, corn starch 9-12 parts, sardine oil 3.2-5 parts, schizochytrid oil 1-5 parts, complex amino acids 0.6-1.5 parts, macroelement premix 1.5-2.5 parts, trace element premix 1.0-1.5 parts, vitamin premix 0.4-1.0 parts and bacterial enzyme oil complex 4.3-4.9 parts.

[0007] The major element premix is ​​prepared from the following raw materials in parts by weight: 20-30 parts of sodium dihydrogen phosphate, 20-30 parts of potassium dihydrogen phosphate, 20-30 parts of calcium lactate and 20-30 parts of calcium gluconate.

[0008] The bacteria-enzyme-oil complex is prepared from the following raw materials in parts by weight: 3 to 9 parts of alkaline protease, 3 to 6 parts of lipase, 3 to 6 parts of glucose oxidase, 5 to 11 parts of Bacillus subtilis, 5 to 14 parts of Clostridium butyricum, and 60 to 75 parts of soybean oil.

[0009] The puffed floating feed for silver pomfret during the grow-out period provided by the present invention is prepared from the following raw materials in parts by weight: 35-45 parts of Peruvian super red fish meal, 6-16.6 parts of chicken meal, 3-6 parts of enzymatically hydrolyzed chicken pulp, 5-9 parts of whole egg powder, 7-13 parts of rice protein powder, 9-12 parts of corn starch, 3.2-5 parts of sardine oil, 1-5 parts of schizochytrid oil, 0.6-1.5 parts of complex amino acids, 1.5-2.5 parts of a major element premix, 1.0-1.5 parts of a trace element premix, 0.4-1.0 parts of a vitamin premix, and 4.3-4.9 parts of a bacterial enzyme-oil complex. The macroelement premix is ​​prepared from the following raw materials in parts by weight: 20-30 parts sodium dihydrogen phosphate, 20-30 parts potassium dihydrogen phosphate, 20-30 parts calcium lactate, and 20-30 parts calcium gluconate; the bacterial enzyme oil complex is prepared from the following raw materials in parts by weight: 3-9 parts alkaline protease, 3-6 parts lipase, 3-6 parts glucose oxidase, 5-11 parts Bacillus subtilis, 5-14 parts Clostridium butyricum, and 60-75 parts soybean oil. The puffed floating feed for silver pomfret grow-out provided by the present invention is a special compound feed that is suitable for the habits of silver pomfret by combining the raw materials in the above formula. The puffed floating feed for silver pomfret during the grow-out period provided by the present invention is suitable for the silver pomfret's poor stress resistance and high-temperature intolerance. During the breeding process, the silver pomfret's feed intake rate can be increased, especially the feed intake during high and low temperature periods. The rich nutritional composition can ensure the silver pomfret's survival rate and growth performance, thereby solving the problem in the prior art that the feed currently fed to silver pomfret results in a low feed intake rate, a low survival rate, and a slow growth rate.

[0010] Preferably, the puffed floating feed for silver pomfret during the grow-out period is prepared from the following raw materials in parts by weight: 40-42.5 parts of Peruvian super red fish meal, 9-12 parts of chicken meal, 4-5 parts of enzymatic chicken pulp, 6.5-8 parts of whole egg powder, 9-11 parts of rice protein powder, 9.5-10.5 parts of corn starch, 3.5-4 parts of sardine oil, 2.3-4 parts of schizochytrid oil, 0.9-1.2 parts of complex amino acids, 1.8-2.2 parts of macroelement premix, 1.2-1.3 parts of trace element premix, 0.6-0.8 parts of vitamin premix and 4.5-4.7 parts of bacterial enzyme oil complex.

[0011] In one embodiment of the present invention, the puffed floating feed for silver pomfret during the grow-out period is prepared from the following raw materials in parts by weight: 42.5 parts of Peruvian super red fish meal, 9 parts of chicken meal, 4 parts of enzymatic chicken pulp, 6.5 parts of whole egg powder, 11 parts of rice protein powder, 10.5 parts of corn starch, 3.5 parts of sardine oil, 4 parts of schizochytrid oil, 0.9 parts of complex amino acids, 1.8 parts of macroelement premix, 1.2 parts of trace element premix, 0.6 parts of vitamin premix and 4.5 parts of bacterial enzyme oil complex.

[0012] In one embodiment of the present invention, the puffed floating feed for silver pomfret during the grow-out period is prepared from the following raw materials in parts by weight: 40 parts of Peruvian super red fish meal, 12 parts of chicken meal, 5 parts of enzymatic chicken pulp, 8 parts of whole egg powder, 9 parts of rice protein powder, 9.5 parts of corn starch, 4 parts of sardine oil, 2.3 parts of schizochytrid oil, 1.2 parts of complex amino acids, 2.2 parts of macroelement premix, 1.3 parts of trace element premix, 0.8 parts of vitamin premix and 4.7 parts of bacterial enzyme oil complex.

[0013] Preferably, the composite amino acid is prepared from the following raw materials in parts by weight: 15 to 30 parts of L-lysine, 5 to 20 parts of hydroxymethionine calcium, 10 to 25 parts of L-threonine, 5 to 20 parts of L-arginine, and 5 to 65 parts of taurine.

[0014] Preferably, the trace element premix is ​​a commercially available trace element premix for marine fish.

[0015] Preferably, the vitamin premix is ​​a commercially available marine fish vitamin premix.

[0016] The present invention also provides a method for preparing the puffed floating feed for silver pomfret during the grow-out period, comprising the following steps: The raw materials are weighed according to the formula amount, the powdered raw materials are crushed, sieved, and mixed evenly to obtain a powdered mixture; wherein the powdered raw materials include Peruvian super red fish meal, chicken meal, whole egg powder, rice protein powder, corn starch, complex amino acids, macroelement premix, trace element premix and vitamin premix.

[0017] The enzymatically hydrolyzed chicken pulp, the sardine oil and the Schizochytrium oil are added to the powdery mixture, and the mixture is evenly mixed to obtain a powdery mixture.

[0018] According to the mass ratio of the powder mixture to water being 4:1, the water is added to the powder mixture, mixed evenly, and then puffed to obtain puffed feed.

[0019] The puffed feed is then dried until its water content is 8%, and then the bacteria-enzyme-oil complex is sprayed onto its surface. After cooling, the puffed floating feed for the silver pomfret growing period is obtained.

[0020] Preferably, the temperature during puffing is 80° C. to 160° C., and the time during puffing is 28 seconds to 32 seconds.

[0021] Preferably, after puffing, the obtained material is cut to obtain the puffed feed.

[0022] The puffed feed is in the form of spherical particles, and the diameter of the particles is 1.0 mm to 3.0 mm.

[0023] Preferably, sieving refers to sieving through an 80-mesh sieve.

[0024] Preferably, the temperature during the drying is 78°C to 82°C.

[0025] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides an expanded floating feed for silver pomfret during the grow-out period. The expanded floating feed for silver pomfret provided by the present invention is prepared from the following raw materials in parts by weight: 35-45 parts of Peruvian super red fish meal, 6-16.6 parts of chicken meal, 3-6 parts of enzymatically hydrolyzed chicken pulp, 5-9 parts of whole egg powder, 7-13 parts of rice protein powder, 9-12 parts of corn starch, 3.2-5 parts of sardine oil, 1-5 parts of schizochytrid oil, 0.6-1.5 parts of complex amino acids, 1.5-2.5 parts of a macroelement premix, 1.0-1.5 parts of a trace element premix, 0.4-1.0 parts of a vitamin premix, and 4.3-4.9 parts of a bacterial enzyme-oil complex. The macroelement premix is ​​prepared from the following raw materials in parts by weight: 20-30 parts sodium dihydrogen phosphate, 20-30 parts potassium dihydrogen phosphate, 20-30 parts calcium lactate, and 20-30 parts calcium gluconate; the bacterial enzyme oil complex is prepared from the following raw materials in parts by weight: 3-9 parts alkaline protease, 3-6 parts lipase, 3-6 parts glucose oxidase, 5-11 parts Bacillus subtilis, 5-14 parts Clostridium butyricum, and 60-75 parts soybean oil. The puffed floating feed for silver pomfret grow-out provided by the present invention is a special compound feed that is suitable for the habits of silver pomfret by combining the raw materials in the above formula. The puffed floating feed for silver pomfret during the grow-out period provided by the present invention is suitable for the silver pomfret's poor stress resistance and high-temperature intolerance. During the breeding process, the silver pomfret's feed intake rate can be increased, especially the feed intake during high and low temperature periods. The rich nutritional composition can ensure the silver pomfret's survival rate and growth performance, thereby solving the problem in the prior art that the feed currently fed to silver pomfret results in a low feed intake rate, a low survival rate, and a slow growth rate.

[0026] The puffed floating feed for the silver pomfret cultivation period provided by the present invention belongs to a cultivation feed, and the raw materials in its formula interact and influence each other. Among them, Peruvian super red fish meal is a high-quality marine protein source and the main protein source of silver pomfret cultivation feed. Its rich nutritional composition can ensure the survival rate and growth performance of silver pomfret; chicken meal, enzymatic chicken pulp and whole egg powder all come from terrestrial poultry. The replacement of marine raw materials with terrestrial animal raw materials can reduce the excessive dependence of silver pomfret feed on sea-caught raw materials and also reduce feed costs; in preliminary experiments, it was found that enzymatic chicken pulp has a good appetite for silver pomfret. Adding enzymatic chicken pulp to silver pomfret feed can increase its feeding rate on compound feed, especially the feeding amount during high and low temperature periods; silver pomfret is prone to disease during cultivation and has a high mortality rate. Whole egg powder can improve the anti-stress ability of silver pomfret and reduce the increased mortality rate caused by high temperature stress in summer. Silver pomfret are intolerant to plant-derived anti-nutritional factors. Rice protein powder is the primary protein source in this feed formula, alongside animal protein sources. Because it contains no anti-nutritional factors, rice protein powder improves the digestibility and absorption of plant protein by silver pomfret, while also reducing feed formulation costs. Corn starch acts as a binder and bulking agent in the formula. After high-temperature puffing, it improves the feed's stability in water and ensures the feed's floatability. Farmed silver pomfret has lower fat content and less plumpness than wild silver pomfret, resulting in lower quality and a lower commercial price. The judicious combination of sardine oil and schizochytrid oil ensures sufficient fat and highly unsaturated fatty acids in silver pomfret feed, improving the plumpness of commercial silver pomfret and increasing its market value. The combination of terrestrial animal protein sources (chicken meal) and plant protein sources (rice protein powder) in the feed results in an imbalanced amino acid profile. The use of a complex amino acid profile improves the balance and ensures a high feed conversion rate. Silver pomfret scales are small and easily detached due to friction or handling. The macroelement premix, composed of sodium dihydrogen phosphate, potassium dihydrogen phosphate, calcium lactate, and calcium gluconate, provides silver pomfret with more easily absorbed and utilized ionic calcium and ionic phosphorus, thereby improving scale firmness and reducing scale loss that can occur during feeding, during net changes, and in windy and choppy weather. Silver pomfret has a short digestive tract and weak digestive ability, so a bacterial enzyme-oil complex is formulated using alkaline protease, lipase, glucose oxidase, Bacillus subtilis, Clostridium butyricum, and soybean oil. Alkaline protease, lipase, and glucose oxidase improve the digestibility and absorption rate of feed. Bacillus subtilis and Clostridium butyricum can improve the composition of intestinal flora, promote intestinal health, reduce intestinal inflammation, alleviate flatulence, and reduce deaths caused by indigestion and intestinal flatulence. Soybean oil, as a fluid carrier and its inherent lipid nutrition, also facilitates spraying the bacterial enzyme mixture onto the feed surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The invention discloses a self-made puffed floating feed for silver pomfret during the grow-out period.

[0028] Figure 2 It is the silver pomfret in the present invention.

[0029] Figure 3 This is the breeding experimental pond and the experimental silver pomfret in the present invention.

[0030] Figure 4 The figure is a comparison of the daily food intake of different feeds in the present invention.

[0031] Figure 5 The following is a comparison of the survival rates of different feeds in the present invention.

[0032] Figure 6 The figure is a comparison of the weight gain rates of different feeds in the present invention.

[0033] Figure 7 The figure shows the fatness comparison of different feeds in the present invention.

[0034] Figure 8 The figure shows the comparison of feed coefficients of different feeds in the present invention.

[0035] Figure 9 The following is a comparison of the feed costs for raising 1 kg of fish using different feeds in the present invention. DETAILED DESCRIPTION

[0036] The present invention will be described in detail below with reference to the accompanying drawings and specific examples, but they should not be construed as limiting the present invention. Unless otherwise specified, the technical means used in the following examples are conventional means well known to those skilled in the art, and the materials, reagents, etc. used in the following examples, unless otherwise specified, can be obtained from commercial sources.

[0037] Example 1: Preparation of expanded floating feed for silver pomfret during the grow-out period 1. Methods 1. Feed formula Four types of silver pomfret grow-out experimental feeds (L1–L4) were designed. The feed formulas and nutritional components are shown in Table 1. The silver pomfret grow-out experimental feeds are also known as silver pomfret grow-out-specific extruded floating pellet feed, extruded floating pellet feed, and silver pomfret grow-out extruded floating feed.

[0038] Table 1 Formula and nutritional composition of expanded floating pellet feed for silver pomfret cultivation (% wet basis weight) Note: “%” refers to the percentage of wet weight. The control feed (a commercially available brand of turbot grow-out feed) was purchased from Qingdao Qihao Nutrition Technology Co., Ltd.

[0039] Among them, the Peruvian super red fish meal in Table 1 was purchased from Qingdao Qihao Nutrition Technology Co., Ltd.

[0040] The chicken powder in Table 1 was purchased from Qingdao Qihao Nutrition Technology Co., Ltd.

[0041] The enzymatically hydrolyzed chicken pulp in Table 1 was purchased from Qingdao Baiwei Yingge Biotechnology Co., Ltd.

[0042] The whole egg powder in Table 1 was purchased from Bozhou Haichuan Egg Products Co., Ltd.

[0043] The rice protein powder in Table 1 was purchased from Jiangxi Hengding Food Co., Ltd.

[0044] The corn starch in Table 1 was purchased from Jilin COFCO Biochemical Energy Sales Co., Ltd.

[0045] The sardine oil and Schizochytrium oil in Table 1 were purchased from Rongcheng Haoshun Biotechnology Co., Ltd.

[0046] The trace element premix in Table 1 is a commercially available trace element premix for marine fish, which was purchased from Qingdao Master Biotechnology Co., Ltd.

[0047] The vitamin premix in Table 1 is a commercially available marine fish vitamin premix, which was purchased from Qingdao Master Biotechnology Co., Ltd.

[0048] The formula of the composite premix in Table 1 is shown in Table 2.

[0049] Table 2 Formula of compound premix in extruded feed for silver pomfret grow-out period (% wet basis) Note: “%” refers to the percentage of wet weight. Alkaline protease, lipase, glucose oxidase, Bacillus subtilis, and Clostridium butyricum were purchased from Qingdao Jingxuan Sanchen Biotechnology Co., Ltd.

[0050] 2. Processing technology of expanded floating feed for silver pomfret during grow-out period According to the formula in Table 2, L-lysine, calcium hydroxymethionine, L-threonine, L-arginine, and taurine were weighed and mixed evenly to prepare a composite amino acid; According to the formula in Table 2, sodium dihydrogen phosphate, potassium dihydrogen phosphate, calcium lactate and calcium gluconate were weighed and mixed uniformly to prepare a major element premix; According to the formula in Table 2, alkaline protease, lipase, glucose oxidase, Bacillus subtilis and Clostridium butyricum were weighed and mixed evenly, soybean oil was added, and stirred evenly to prepare a bacteria-enzyme-oil complex.

[0051] Weigh each raw material according to the formula in Table 1, grind the powdered raw material through an 80-mesh sieve with a universal grinder, and mix the powdered raw materials evenly according to the formula ratio to obtain a powdered mixture; wherein the powdered raw materials include Peruvian super red fish meal, chicken meal, whole egg powder, rice protein powder, corn starch, compound amino acids, macroelement premix, trace element premix, and vitamin premix; Enzymatically hydrolyzed chicken pulp, sardine oil and schizochytrid oil are added to the powdery mixture, and the mixture is stirred evenly with a blender to obtain a powdery mixture.

[0052] Water was added to the powdered mixture at a mass ratio of 4:1 and the mixture was stirred evenly in a blender. The test feed was prepared using a twin-screw extruder. The mixed material was fed through the feed port. The extrusion chamber temperature was adjusted to 80°C, 100°C, 140°C, 160°C, 140°C, 120°C, and 100°C, with an extrusion time of 30 seconds. A 1.5mm die was used, and the discharged material was cut with a rotary cutter to produce the extruded floating feed.

[0053] The expanded feed was placed in a constant temperature drying oven at 80℃ and dried to 8% moisture. Then the bacteria enzyme oil complex was sprayed on the surface of the feed. After cooling, it was stored in a black plastic bag. The expanded floating feed for silver pomfret growing period was obtained (see Figure 1 ).

[0054] The above feed is suitable for silver pomfret weighing 50g~400g, and can be fed manually or with an automatic pellet feeding machine.

[0055] 3. Breeding experiment The fry species are artificially bred silver pomfret fry (see Figure 2 ), sourced from Jiangsu Marine Fisheries Research Institute.

[0056] Aquaculture experiments were conducted in an underground marine aquaculture system in Qingdao, Shandong Province (see Figure 3 The culture container is a cement pond (3m×2m×1m), with a water depth of 80cm, a salinity of 25, and a water temperature of 25°C. The daily water exchange rate is maintained at more than 50% (v / v).

[0057] Before the formal experiment, healthy fish with an average initial weight of 56.7 g were randomly assigned to tanks, with 150 fish per tank. Each tank was fed one of five formulated diets (L1–L4 and a control diet) twice daily (8:00 and 17:00) using a satiation diet. The experimental period lasted 6 weeks.

[0058] Among them, the expanded slow-sinking feed group served as the control feed group, referring to the fish fed with commercial turbot feed; the expanded floating feed group referred to the fish fed with L1~L4.

[0059] After the experiment, the number of fish in each tank was counted, the average weight of the fish was measured, and the survival rate, weight gain rate, specific growth rate, fatness, daily feed intake, feed coefficient, and feed cost per kg of fish were calculated. The specific calculation formula is as follows:

[0060] Weight gain rate = 100×(W t -W0) / W0; In the above formula, the unit of weight gain rate is %; W0 is the initial average weight of juvenile fish, in g, W t is the final average body weight, in g; t is the number of experimental days; Specific growth rate = (LnW t –LnW0)×100 / t; In the above formula, the unit of specific growth rate is % / d; W0 is the initial average weight of juveniles, in g, and W t is the final average body weight, in g; t is the number of experimental days; Survival rate = (final number of fish - initial number of fish) / initial number of fish × 100; In the above formula, the unit of survival rate is %; Fatness = W t / L 3 ×100; In the above formula, the unit of fatness is % W t is the terminal mean body weight in g, L is the terminal mean body length in cm; Daily food intake (g / day / tail) = W f / final number of fish / t; In the above formula, the unit of daily food intake is g / tail / day; W f is the amount of feed ingested by fish, in g; Feed coefficient = W f / (W t -W0); In the above formula, W0 is the initial average weight of juvenile fish, in g, W t is the final average body weight, in g; W f is the amount of feed consumed by fish, in g; t is the number of experimental days; The feed cost of raising 1kg of fish = feed coefficient × feed unit price.

[0061] The results are shown in Table 3.

[0062] Table 3 Comparison of growth performance of five types of silver pomfret grow-out feeds As shown in Table 3, the daily feed intake of silver pomfret in the L1-L4 puffed floating feed groups (see Figure 4 ), survival rate (see Figure 5 ), weight gain rate (see Figure 6 ), specific growth rate, fatness index (see Figure 7 ) were higher than those in the control feed group (commercial turbot feed), and the feed coefficient (see Figure 8 ) and feed costs per kg of fish (see Figure 9 ) were lower than those in the control group.

[0063] The present invention provides an expanded floating feed for silver pomfret during its grow-out period. The expanded floating feed for silver pomfret provided by the present invention is prepared from the following raw materials: Peruvian super red fish meal, chicken meal, enzymatically hydrolyzed chicken pulp, whole egg powder, rice protein powder, corn starch, sardine oil, schizochytrid oil, complex amino acids, macroelement premix, trace element premix, vitamin premix, and a bacterial enzyme-oil complex. The expanded floating feed for silver pomfret provided by the present invention is prepared from the following raw materials: Peruvian super red fish meal, chicken meal, enzymatically hydrolyzed chicken pulp, whole egg powder, rice protein powder, corn starch, sardine oil, schizochytrid oil, complex amino acids, macroelement premix, trace element premix, vitamin premix, and a bacterial enzyme-oil complex. The raw materials in the above formula are combined to form a special compound feed that suits the habits of silver pomfret. The puffed floating feed for silver pomfret during the grow-out period provided by the present invention is suitable for the silver pomfret's poor stress resistance and high-temperature intolerance. During the breeding process, the silver pomfret's feed intake rate can be increased, especially the feed intake during high and low temperature periods. The rich nutritional composition can ensure the silver pomfret's survival rate and growth performance, thereby solving the problem in the prior art that the feed currently fed to silver pomfret results in low feed intake, low survival rate and slow growth rate of the silver pomfret.

[0064] It should be noted that when the present invention involves a numerical range, it should be understood that both endpoints of each numerical range and any value between the two endpoints can be selected. To avoid redundancy, the present invention describes a preferred embodiment.

[0065] Although preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once the basic inventive concepts become known, and all such changes and modifications fall within the scope of the present invention.

Claims

1. An expanded floating feed for silver pomfret during the grow-out period, characterized in that: The puffed floating feed for silver pomfret during the grow-out period is prepared from the following raw materials in parts by weight: Peruvian super red fish meal 35-45 parts, chicken meal 6-16.6 parts, enzymatic chicken pulp 3-6 parts, whole egg powder 5-9 parts, rice protein powder 7-13 parts, corn starch 9-12 parts, sardine oil 3.2-5 parts, schizochytrid oil 1-5 parts, complex amino acids 0.6-1.5 parts, macroelement premix 1.5-2.5 parts, trace element premix 1.0-1.5 parts, vitamin premix 0.4-1.0 parts, and bacterial enzyme oil complex 4.3-4.9 parts; The major element premix is ​​prepared from the following raw materials in parts by weight: 20-30 parts of sodium dihydrogen phosphate, 20-30 parts of potassium dihydrogen phosphate, 20-30 parts of calcium lactate and 20-30 parts of calcium gluconate; The bacteria-enzyme-oil complex is prepared from the following raw materials in parts by weight: 3 to 9 parts of alkaline protease, 3 to 6 parts of lipase, 3 to 6 parts of glucose oxidase, 5 to 11 parts of Bacillus subtilis, 5 to 14 parts of Clostridium butyricum, and 60 to 75 parts of soybean oil.

2. The method for preparing the expanded floating feed for silver pomfret during the grow-out period according to claim 1, wherein: The puffed floating feed for silver pomfret during the grow-out period is prepared from the following raw materials in parts by weight: 40-42.5 parts of Peruvian super red fish meal, 9-12 parts of chicken meal, 4-5 parts of enzymatic chicken pulp, 6.5-8 parts of whole egg powder, 9-11 parts of rice protein powder, 9.5-10.5 parts of corn starch, 3.5-4 parts of sardine oil, 2.3-4 parts of schizochytrid oil, 0.9-1.2 parts of complex amino acids, 1.8-2.2 parts of macroelement premix, 1.2-1.3 parts of trace element premix, 0.6-0.8 parts of vitamin premix and 4.5-4.7 parts of bacterial enzyme oil complex.

3. The method for preparing the expanded floating feed for silver pomfret during the grow-out period according to claim 1, wherein: The composite amino acid is prepared from the following raw materials in parts by weight: 15 to 30 parts of L-lysine, 5 to 20 parts of hydroxymethionine calcium, 10 to 25 parts of L-threonine, 5 to 20 parts of L-arginine, and 5 to 65 parts of taurine.

4. The method for preparing the expanded floating feed for silver pomfret during the grow-out period according to claim 1, wherein: The steps include: Weighing the raw materials according to the formula amount, crushing the powdered raw materials, sieving, and mixing them evenly to obtain a powdered mixture; wherein the powdered raw materials include Peruvian super red fish meal, chicken meal, whole egg powder, rice protein powder, corn starch, complex amino acids, macroelement premix, trace element premix, and vitamin premix; adding the enzymatically hydrolyzed chicken pulp, the sardine oil, and the Schizochytrium oil to the powdered mixture, and mixing evenly to obtain a powdered mixture; According to the mass ratio of the powder mixture to water being 4:1, the water is added to the powder mixture, mixed evenly, and then puffed to obtain puffed feed; The puffed feed is then dried until its water content is 8%, and then the bacteria-enzyme-oil complex is sprayed onto its surface. After cooling, the puffed floating feed for the silver pomfret growing period is obtained.

5. The preparation method according to claim 4, characterized in that The temperature during puffing is 80°C~160°C; the time during puffing is 28s~32s.

6. The preparation method according to claim 4, characterized in that After puffing, the obtained material is cut to obtain the puffed feed; The puffed feed is in the form of spherical particles, and the diameter of the particles is 1.0 mm to 3.0 mm.

7. The preparation method according to claim 4, characterized in that Sieving refers to passing through an 80-mesh sieve.

8. The preparation method according to claim 4, characterized in that The temperature during the drying is 78° C. to 82° C.

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