RU2366265C1 - Method of forage preparation for early fry of salmon - Google Patents

Abstract

FIELD: agriculture.

SUBSTANCE: invention concerns fish breeding. Method involves obtainment of proteolytic fermentative protein hydrolysate without separation of non-fermented protein residue, mixture with vegetable components, fish oil, vitamin and mineral premix, and mix drying to achieve end product humidity of 10% or lower. Waste of hydrobiont processing and king crab hepatopancreas enzymes as proteolytic agent are used as raw material, protein hydrolysate is prepared at 1:1 ratio of raw material and water and 1:0.010-1:0.030 or 1:0.001-1:0.003 weight ratio of raw material and raw hepatopancreas proteolytic agent or preparation obtained from it respectively, at 50-55°C and natural pH for 1.5-2 hours to achieve 12-20% hydrolysis grade. Protein hydrolysate with up to 90% weight part of water, prepared for application, is mixed to achieve homogenous mass with minced fish out of low-value fish species, flour production waste, sea-weed flour and premix. Obtained homogenous mass is delivered for drying by continuous flow to vibrofluidised layer at 80-95°C and dried in several stages not exceeding 1 minute each until the end product is ready.

EFFECT: enhanced biological value of forage, reduced labour and power cost.

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Description

The invention relates to fish farming and can be used in the preparation of starter feed, in particular feed for early juvenile salmon fish.

According to modern concepts in the field of physiology and biochemistry of fish nutrition, the feed composition is significantly affected by the fractional composition of their protein component. This determines the efficiency of assimilation of food and, in turn, affects the growth rate and survival of larvae.

At present, the domestic feed industry is experiencing an acute shortage of high-quality feed raw materials, especially in protein components. The problem was stopped by the cessation of production of microbiological synthesis products.

Fishmeal - a traditional protein component of feed, manufactured using modern technology, does not fully meet the requirements for feed to meet the nutritional needs of salmon fish in early ontogenesis. In addition, in the production of animal feed by extrusion or expansion, some irreplaceable batteries are partially destroyed, which also necessitates the search for new unconventional technologies and components.

It is known that during the mixed feeding period of Atlantic salmon in fish, the activity of digestive enzymes is still rather weak. The transition of fish larvae to active nutrition during the resorption of the yolk sac is a critical stage of ontogenesis, accompanied by the most massive mortality. This is due to the formation of the morphological and functional organization of the digestive system, depletion of nutrient reserves of the yolk sac and the low digestibility of the gastrointestinal tract of juvenile fish. Under natural conditions, mortality at this stage is an instrument of natural selection. Under the conditions of artificial fish farming, the replacement of high molecular weight native proteins in products of their partial hydrolysis should be considered a promising direction for solving this problem. Enzymatic protein hydrolysates of varying degrees of cleavage and in different doses were introduced into starter feeds for cyprinids (Auth. St. USSR 1575333; Turetsky V.I., Ilyina I.D. Nutritional requirements of carp larvae for hydrolyzed (degraded protein products). Reports of the All-Union Conference on Industrial Fisheries and Problems of Feed, Feed Production and Fish Feeding. - M., VNIIPRKh, 1985. - P.155-158), whitefish (fish meal hydrolysates in starter feeds for whitefish larvae as a leading factor in feeding efficiency / Kanidiev A.N., Turetsky V.I., Ponomare S.V. et al. // Biological foundations of rational feeding of fish. - M. - 1986. - S.121-126), sturgeon (Razumovskaya R.G., Bigzhi A.I. Development of technology for producing hydrolyzate - the main ingredient of feed for juvenile sturgeon fish // Fish and seafood processing: Informpack / VNIERH. - M., 2000. - P.18), and salmon (Berge GM, Storebakken T. Fish protein hydrolyzate in starter diets for Atlantic salmon Saimo salar fru // Aquaculture. - 1996. - Vol. 145, N1. - P.205-212) fish and in all experiments noted positive trends in the change in the main fish breeding indicators: survival, growth, feed coefficient.

It has been established that the introduction of the waste of processing Icelandic scallop (OPT) into the starting feed of the enzymatic hydrolyzate has a positive effect on the survival of juvenile salmon during mixed feeding (age 550-700 τs). Replacing 20% of fishmeal in feed with OPT hydrolyzate can increase by 20-30% the mass fraction of soluble protein components and, as a result, the survival of fry at the age of 50-120 days (550-1300 τs) (Mukhin V.A., Novikov V. Yu, Proteolysis and proteolytic enzymes in tissues of marine invertebrates. - Murmansk: Pinro Publishing House, 2002. - P.86-87).

The results of studies also showed that in the case of feeding juveniles with feeds with 5 and 10% dry protein hydrolyzate (BG), fish grew faster than in feed with 20% BG, but the largest weight gain was obtained on the Finnish feed Respons (control). The differences in the average daily gain of fish contained in the control feed and feed using 5 and 10% BG were insignificant and amounted to 0.20 and 0.23%, respectively.

The introduction of 20% BG in 2 times increased fish survival compared to using 5% BG. Superiority of the studied feed with a content of 10; 5 and 20% of BG in this indicator over the control feed increased in the indicated sequence, and the differences in survival rates were 1.3; 10.0 and 22.6 respectively.

However, studies also showed that the control food had a higher protein content and feeding with Finnish food was accompanied by more intensive accumulation of protein in the tissues, the content of which during the growing period increased by 18.3 (by dry weight) versus 1.9 in fish fed with 10% BG (Mukhina I.N. Composition and effectiveness of starter feed RESPONS and domestic analogues containing protein hydrolysates / Fisheries, 2005. - No. 2. - P.72).

The results obtained allowed us to conclude that the studied feeds should be improved and balanced through the use of modern technologies to preserve the native properties of raw materials, and the introduction of the functional ingredients containing a high level of biologically active substances that are vital at this stage of fish development ( low molecular weight peptides, essential amino acids, PUFAs, phospholipids, carotenoids, etc.).

The closest in technical essence to the proposed solution is a method of preparing starter feed for juvenile sturgeon fish (Pat. RF №2159556, 7 A23K 1/10 Method for preparing feed for juvenile sturgeon fish / Razumovskaya R.G., Amir B.I .; patent holder ASTU, z. No. 99117275/13, application. September 6, 1999: published on December 27, 2000, Bull. No. 36).

The method involves the introduction of a hydrolyzate as a substitute for fish meal without separation of the unfermented protein residue obtained from low-value and substandard fish with a non-protein nitrogen hydrolysis depth of 23-41% of the total nitrogen of the feedstock. Hydrolysis is carried out at a dose of water of 30% by weight of minced meat and a temperature of 55-60 ° C, pH 6.6, based on autoproteolysis or with the addition of proteolytic preparations. Inactivate by heating to 90 ° C. Bone residue is removed by rubbing.

The resulting mass is dried at a temperature of 80 ° C to a moisture content of 35-40%. Dried fish hydrolyzate without separation of the unfermented protein residue is introduced into the feed in an amount of 50-60% by weight of the feed mixture and mixed with other components, for example, in accordance with the composition: wheat flour 6.0%, soybean meal 10.0% (vegetable components) dry return 8.0%, yeast 22.0%, sunflower oil 2.5%, premix 3-1.5%, while the ingredients of the feed are moistened. The resulting mixture is dried at a temperature of 60 ° C to a moisture content of 10% and fractionated to grits, depending on the size of the pharynx in juvenile sturgeon fish.

The food is physiologically complete for sturgeon larvae: when switching to active nutrition, due to the biological value of the feed, the feed costs are reduced (1.2-1.5 units), the larval survival is increased up to 95% (compared to feed containing fishmeal).

The disadvantages of the method include the fact that rather expensive components were introduced into the feed composition: oil, flour, reverse, and minced fish was used to prepare the hydrolyzate. The feed is intended for a specific species - sturgeon and takes into account the nutritional characteristics of this particular species of fish.

The efficiency of starter feeds for early juvenile fish, which include new sources of the protein component - hydrolysates, increases compared to the well-known domestic feeds containing fishmeal, due to a higher digestibility of feed nutrients and, as a consequence, increased survival of juveniles at the time of transition active nutrition, as well as by reducing the cost of their production. The results obtained served as the basis for the development of methods for the manufacture of experimental feed.

The purpose of the invention is to increase the efficiency of starter feeds and improve fish breeding indicators by improving the method of preparation and introducing balanced biologically active components in the composition of the feed intended for feeding a certain type of fish: early salmon juveniles in a critical period of her life - the moment of transfer to external feed.

During experimental salmon cultivation, we have established the feasibility of a complete replacement of fish meal with minced fish with the addition of protein hydrolyzate and wheat germ (wheat germ flakes and / or bagasse from them after oil separation), as well as the efficiency of application of feed drying in a vibratory boiling layer, which allows maximum preservation native properties of raw materials and the content of biologically active substances in it.

The proposed method for the manufacture of feed for early juvenile salmon fish involves the preparation of feed components: minced fish from fillets of low-value fish species and enzymatic protein hydrolyzate from waste products of hydrobionts, their subsequent mixing with plant components - waste from flour milling (OMP): wheat germ flakes and / or cake of them - Vitazar, and algal flour, fish oil, premix with a ratio of mixed components, in wt.%:

Hydrolyzate from waste products of hydrobionts, in terms of dry matter, in which mass fraction of water less than 10% 10-15, Minced fish (fillet of low-value fish species) 45-50 Fish fat 7-8 Flour milling waste (PZH or Vitazar) 30-31 Algal flour one Vitamin Premix one

It was found that food prepared with a ratio of components according to the invention meets the physiological needs of salmon larvae.

The introduction of an enzymatic protein hydrolyzate into the feed made it possible to ensure a high level of complete protein and an increased content of low molecular weight peptides in the feed, which are easily absorbed by the underdeveloped digestive system of early juvenile salmon (larvae). The protein hydrolysates included in the feed with a certain depth of hydrolysis (12-20%), characterized by a low content of free amino acids and a high level of easily digestible oligo - and polypeptides, are for larvae a source of protein with a relatively low molecular weight, which contributes to their more efficient use of this component feed and, as a consequence, the rapid growth and formation of the digestive tract of early juveniles.

Protein hydrolysates prepared from marine hydrobionts, as a rule, contain from 6 to 19% lipids and from 66 to 76% protein with a complete set of amino acids. Proteins of enzymatic hydrolysates are characterized by a high content of low molecular weight peptides with an MM of less than 2 kDa (up to 95%).

With the addition of flour milling waste (OMP): wheat germ flakes or Vitazar product, which is obtained during partial separation by pressing germ oil, the optimum level of functional ingredients was achieved in the feed due to the relatively high content of phospholipids, short chain polyenic fatty acids in wheat germ products: linoleic and linolenic, fat-soluble vitamins and β-carotene.

It is known that OMP proteins are 60-80% composed of easily digestible, water- and salt-soluble fractions (albumin, globulin), which increases their accessibility to the action of the digestive enzymes of juvenile fish. By their biological value, proteins of WMD are close to proteins of casein, milk powder, eggs and beef.

Wheat germ flakes and Vitazar (oilcake) contain up to 36% of high-grade protein and from 7 to 12% lipids with a favorable ratio of polyene fatty acids, the amount of which reaches 70% of the total, of which linolenic acid is 8%.

An additional introduction of algal flour to the feed contributes to the fullest satisfaction of the needs of young salmon fish for vitamins, macro- and microelements.

The biochemical characteristics of the composition that we noted made it expedient to use new components of biologically active action in feed and the possibility of excluding expensive fish meal from the composition of the feed that did not satisfy the physiological needs of salmon larvae.

Fillet of low-value fish species, for example, perch Sebastes goodie and herring Clupea harengus membras, etc., which is crushed to obtain a homogeneous homogenate, is used as raw material for the preparation of minced fish.

The raw material for obtaining protein hydrolysates can be waste after filleting of low-value fish species, for example, perch and Baltic herring, and processing of marine hydrobionts, for example, soft wastes (mantle, gonads, gills) of the Icelandic scallop Clamys islandicus. etc.

The breakdown of protein-containing wastes during hydrolysis is carried out by the hepatopancreas enzymes of king crab.

Raw materials for hydrolysis are crushed to obtain a homogenate, to which water is added at a ratio of the masses of raw materials and water 1: 1 and a proteolytic agent: raw hepatopancreas or a preparation obtained from it at a ratio of 1: 0.010 - 1: 0.030 and 1: 0.001 - 1: 0.003 respectively. The components are thoroughly mixed.

The hydrolysis process is carried out at a temperature of 50-55 ° C and a natural pH for no more than 1.5-2 hours to achieve a degree of hydrolysis of 12-20%. The result is a hydrolyzate with a water content of 40 to 90% (depending on the raw materials used).

The proposed method for the manufacture of food provides, as options, the introduction into the food prepared in advance or immediately before mixing the components: wet (in terms of dry matter) or dry hydrolyzate, fresh or frozen minced meat.

As a rule, the prepared hydrolyzate is mixed with minced fish and other components of the feed immediately after their preparation in an amount of 10-15% (in terms of dry matter, in which the mass fraction of water is less than 10%).

Thus, the amount of this component introduced into the feed depends on the moisture content in the prepared hydrolyzate. For example, when a wet hydrolyzate with a water content of 90% is introduced into the feed, it is administered in an amount equal to the total content of all remaining components in the ratio according to the invention.

In cases where feed production depends on the frequency of supply of raw materials or other factors as an option, in order to store the finished component of the feed - hydrolyzate until the feed is manufactured, the resulting hydrolyzate is dried under gentle temperature conditions until it reaches a moisture content of not more than 10% and is mixed with fish at the right time minced meat and other components of the feed in dry form.

Cooked minced fish can also be stored in finished form, for which it is frozen and used at the right time after thawing, mixing as an option with a wet or dry hydrolyzate. Prepared for mixing, the hydrolyzate and other components provided for the preparation of feed are successively added to minced fish and mixed thoroughly until a homogenate is obtained.

A homogeneous liquid mass is sent in a continuous stream to drying in a vibro-boiling layer at a temperature of 80-95 ° C for 1 min. For example, in the dryer "Tayo Gege" (Japan). The resulting grains are dried in a dryer in several stages, each lasting no more than 1 min, with interruptions sufficient to cool the prepared product.

Ready-made feed (grains), the color of which corresponds to the color of the used components, is separated depending on the size of the juveniles into groups: less than 0.3; 0.3-0.5; 0.5-0.6 mm and receive food, the size of which meets the fish breeding requirements.

The mode of such drying is gentle, since the finished product manages to preserve the nutrients (quality) of the raw materials used for preparing the feed as much as possible.

The proposed method for the manufacture of feed improves the biological value of the finished product by additionally introducing low molecular weight fractions of the protein and preserving the vital amino acids, fatty acids, phospholipids, vitamins, carotenoids and other biologically active substances of feed raw materials and provides options for introducing the hydrolyzate prepared before mixing or in advance and stuffing.

The method is simple, does not require significant labor and energy. A small amount of equipment is used in production, which makes it possible to prepare feed at small specialized enterprises and aquafarm.

Studies conducted by specialists showed the promise of feeding juveniles with small-component, physiologically valuable feeds for larvae with the introduction of biologically active components such as enzymatic hydrolysates obtained from waste products from hydrobionts, a source of easily digestible protein, wheat germ and products from them (PZH, Vitazar), enriching the food with vitamins, essential amino acids and polyunsaturated fatty acids.

Food Preparation Examples

Example 1. An enzymatic protein hydrolyzate was prepared from Icelandic scallop processing waste (gonads, mantle and other soft waste) using a ready-made enzyme preparation from commercial king crab hepatopancreas. To do this, 2.5 kg of waste thawed in air at room temperature was loaded with 5 g of an enzyme preparation from hepatopancreas of king crab, crushed at the same time to achieve the greatest contact of the raw material with the enzyme, placed in a container with a stirring device, filled with 2.5 l of water.

The hydrolysis process was carried out at a temperature of 50 ° C, pH 7.5 for 2 hours. Inactivated by heating.

4.9 L of hydrolyzate was obtained without separation of an unfermented protein residue with a pH of 6.3, a degree of hydrolysis of 16.5% and a humidity of 90%. The finished hydrolyzate was concentrated on an evaporator to a solids content of 30-65% and dried (freeze-dried) at a temperature of 90 ° C until a moisture content of less than 10% was reached.

For the preparation of minced fish used herring fillets. The dry hydrolyzate and other components provided for in the feed were sequentially added to the minced fish and mixed thoroughly until a homogenate was obtained with the mass of the components, in g:

Hydrolyzate from processing waste Icelandic scallop 1500 Minced herring fish 4500 Fish fat 700 Premix one hundred Flour milling waste 3100 Algal flour one hundred Wet (41%) homogenate mass 10,000

The resulting liquid mass was continuously loaded into a Tayo Ghege dryer (Japan) and dried to a moisture content of less than 10% in a vibro-boiling layer at a temperature of 90-95 ° C in three steps with a duration of 1 minute with intervals of up to 10 minutes, sufficient to cool the cooked product to room temperature.

As a result, 7900 g of finished feed was obtained - dark brown granules measuring 0.3-0.5 mm.

In the feed, made on the basis of minced fish using a hydrolyzate and wheat germ flakes, energy indicators were 18-19 (calorie content) and 13-14 (metabolic energy).

Example 2. An enzymatic protein hydrolyzate was prepared from wastes from Icelandic scallops (gonads, mantle, and the rest — soft wastes, fish fillet wastes) using hepatopancreas, a raw Kamchatka crab. For this, 7.5 kg of frozen waste was thawed in air at room temperature. Loaded with 0.150 kg of hepatopancreas, a raw Kamchatka crab, crushed in a homogenizer, placed in a container with a mixing device, filled with 7.5 l of water.

The hydrolysis process was carried out at a temperature of 53 ° C, pH 7.0 for 2 hours. Inactivated by heating.

Received 15.0 l of hydrolyzate without separation of the unfermented protein residue with a pH of 6.3, a degree of hydrolysis of 16.5% and a humidity of 90%.

For the preparation of minced fish used filet of pepper perch.

Wet hydrolyzate and other components were added to minced fish and mixed thoroughly until a homogenate was obtained with the mass of components, in g:

Wet Hydrolyzate from Waste processing of aquatic organisms 11000

(with a depth of hydrolysis of 16.5%, humidity of 90%)

Minced perch 5000 Fish fat 700 Premix one hundred Flour milling waste 3100 Algal flour one hundred Wet weight of feed 20000

Depending on the moisture content in the finished hydrolyzate, its amount for introduction into the feed was calculated based on its dry matter content (i.e., calculated on the dry matter, in which the mass fraction of water is less than 10%). Therefore, when a wet hydrolyzate with a water content of 90% is introduced into the feed, in order to maintain the ratio of components in wt.%, It was introduced in an amount equal to the total content of all remaining components, i.e. in our case, 11000

Drying was carried out analogously to example 1. The result was 7500 g of finished feed - granules (grains) of a dark gray color, several fractions, less than 0.3 mm in size; 0.3-0.5 mm and more than 0.5 mm.

Example 3. Analogously to example 1, but used pre-prepared minced meat from river perch and prepared cake from wheat germ "Vitazar". Stuffing was previously thawed.

The production properties of the experimental feed were evaluated by survival, growth rate, chemical composition and biochemical parameters of experimental fish. As a control, the starting feed “Respons” of the company “Rehuraisio” (Finland) was used.

Experimental batches of starter feed were made on an experimental basis.

The results of the experimental feeding of salmon juveniles testified to the positive effect of using protein hydrolysates from marine hydrobiont processing waste (herring, perch, Iceland scallop) and products (wheat germ) from OMP in starting feeds of Atlantic salmon at fish hatcheries of Murmansk region and Karelia due to the increased survival of fish larvae and stabilization of the growth rate when 10 and 15% hydrolysates are used in starter feeds (the degree of protein hydrolysis is 16 , 5%), for example, from the waste of Icelandic scallop in comparison with the use of Finnish feed in the control.

The objects of research were the Atlantic salmon Salmo salar L. and its freshwater form Salmo salar m. sebago (Girard).

Experimental work and production tests of compound feeds were carried out for three years at fish-breeding plants in the Murmansk region.

Atlantic salmon larvae with an average weight of 149 to 255 mg were grown in direct-flow trays.

Starting feed, including imported, was characterized by a high protein content - 51-57%, fat - 12-18%, ash - 8-13% and moisture 5-7%.

Fish growth is, first of all, the formation and accumulation of protein in the tissues that underlie the increase in weight and linear parameters of juveniles.

The protein of all starter feed variants was balanced in amino acid composition and corresponded to their level in the yolk sac of free Atlantic salmon embryos. In lipids of starter feeds, the amount of saturated fatty acids (in% of the total) varied in the range from 18 to 31, polyunsaturated from 17 to 32 (in feed with 10% hydrolyzate from salaki - 59), monounsaturated - from 46 to 59 (in feed with 10% hydrolyzate from herring - 23). The level of phospholipids in feed varied from 19 to 35% of the total lipid. Starting feed lipids were characterized by a high content of triacylglycerols and sterols in total with their esters, which are storage lipids, as well as phospholipids, which play a significant role in protein utilization along with other equally important functions. The qualitative and quantitative composition of feed lipids made it possible to ensure the rapid growth of juvenile Atlantic salmon and corresponded to the composition of small zooplankton lipids, which serves fry as food in nature.

The protein of the studied experimental feed was complete and balanced in amino acid composition.

Indicators of lipid quality and bacteriological contamination were within acceptable limits.

The results of table 1 allow us to conclude that there were no significant differences when comparing the effectiveness of Finnish feed with other feed options in terms of survival.

It is also seen that the experimental groups (experiment 1, p. 1 and experiment 3, p. 4) receiving food prepared by the proposed method showed very good results both in terms of survival and the rate of daily growth.

The introduction of protein hydrolysates into the feed containing a high specific gravity of low molecular weight peptides, easily digestible in the intestines of fish larvae, contributed to the achievement of equivalent fish-breeding indicators, and in some experiments increased the survival rate of early juveniles in comparison with the Finnish feed. The use of OMP in the feed composition made it possible to level the differences in fish breeding indicators (survival and weight gain) in comparison with the imported analogue.

The development of intensive forms of fish farming requires the creation and use of complete and cost-effective feed, balanced in all respects.

The production of compound feeds physiologically valuable for salmon larvae by introducing modern technologies and replacing traditional raw materials with new ones is due to the promise of these areas in the field of feed production in terms of ease of manufacture and monitoring of the quality of feeds, as well as obtaining a higher economic effect.

The proposed feed containing 10-15% protein hydrolysates and 30-31% OMP is not inferior to more expensive imported counterparts in terms of survival and growth rate of early salmon juvenile fish. The feed is cheaper, since a small amount of feed components is made, including from waste products from aquatic organisms and cereals, without the use of expensive fish meal.

The proposed method for the manufacture of feed provides options for preparing feed from ready-made long-stored components, improves the biological value of the feed, does not require sophisticated equipment, significant labor and electricity. Food preparation is possible at small specialized enterprises and aquafarm.

Table 1 Growth and survival of juvenile Atlantic salmon when grown on various feeds Feed option Indicator Weight, mg (M ± τm) Mass gain Survival initial the ultimate % average daily% % to control % % to control Experience 1 from June 16 to September 24 Food with 15% BG and Vitazar 255 ± 10 1027 ± 134 303 2.2 102 91.7 102 "Respons" 0.6 mm control 255 ± 10 1004 ± 145 294 2.2 one hundred 90.2 one hundred Experience 2 from 01.06 to 22.06 Food with 10% BG from herring 149 ± 67 252 ± 116 69 2.5 95 97.3 102 "Respons" 0.6 mm control 149 ± 67 264 ± 131 77 2.7 one hundred 95.1 one hundred Experience 3 from 10.06 to 02.07 Food with 5% BG 151 ± 4 240 ± 20 59 2.0 73 97.8 one hundred Food with 10% BG 151 ± 4 305 ± 13 102 3,1 93 98.5 one hundred Aft 15% BG 151 ± 4 301 ± 14 99 3.0 91 98.5 one hundred Feed with 10% BG and PZH 151 ± 4 300 ± 11 99 3.0 91 98.8 101 "Respons" 0.5 mm control 151 ± 4 329 ± 27 118 3.4 one hundred 98.2 one hundred

Claims (4)

1. The method of preparation of feed for early juvenile salmon fish, including obtaining a proteolytic enzymatic protein hydrolyzate without separating the non-fermented protein residue, mixing with vegetable components, fish oil, vitamin-mineral premix and drying the mixture until the finished product reaches a moisture content of not more than 10%, characterized in that as a raw material for the preparation of the hydrolyzate use waste processing hydrobionts, proteolytic agent - enzymes hepatopancreas king crab, the preparation of the protein hydrolyzate is carried out at a ratio of the mass of raw materials and water 1: 1, the mass of raw materials and proteolytic agent: hepatopancreas raw or a preparation obtained from it - 1: 0.010-1: 0.030 and 1: 0.001-1: 0.003, respectively, at a temperature of 50 -55 ° C and natural pH for 1.5-2 hours to achieve a degree of hydrolysis of 12-20%, the protein hydrolyzate prepared for administration with a mass fraction of water content of up to 90% is mixed until a homogeneous mass is obtained with minced fish made from low-value fillet species of fish with waste from flour milling (WMD) - wheat germ and / or oilcake from them and algal flour - plant components, premix in their ratio, wt.%:
Hydrolyzate from waste products of hydrobionts, in terms of dry matter, in which mass fraction of water is less than 10% 10-15 Minced fish fish mincemeat 45-50 Fish fat 7-8 WMD 30-31 Algal flour one Mineral Vitamin Premix one
the resulting homogenate is sent in a continuous stream to drying in a vibro-boiling layer at a temperature of 80-95 ° C and dried in several stages with a duration of not more than 1 min each until the target product is ready. 2. The method of preparation of feed for early juvenile salmon fish according to claim 1, characterized in that the hydrolyzate with a moisture content of more than 10% is mixed immediately after cooking with minced fish and other components of the feed in a ratio of 10-15% in terms of dry matter with a mass fraction water in the component is less than 10%. 3. The method of preparation of feed for early juvenile salmon fish according to claim 1, characterized in that the finished hydrolyzate is concentrated to a solids content of 30-40%, then dried to reach a moisture content of not more than 10% and mixed with minced fish and other components of the feed in dry form. 4. A method of preparing food for early juvenile salmon fish according to any one of claims 1 and 3, characterized in that the prepared minced fish is frozen and used to prepare food after defrosting.