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United States Department of Agriculture

Agricultural Research Service

USDA - ARS

Trout-Grains Project

ARS Plant-based Trout Diets

It has long been hypothesized by some people that trout and other farmed fish require fish meal or animal products in their feed. Studies conducted in this Project and in others around the world have shown that fish require specific nutrients, not ingredients. Many of the nutrients found in fish meal that are not present in plant proteins have been identified allowing for the production of farmed fish without fish meal. The exact formulation of the fish meal free diet will determine which nutrients and the amount of that nutrient, which needs to be supplemented.

In general when only plant sources of protein are used in a fish feed, lysine, methionine, threonine, and taurine may need to be supplemented. The minerals potassium and magnesium have also been shown to be beneficial. The vitamin inositol is found in fish meal and trout benefited from supplementation when added to a plant based feed. Listed below is a the ARS plant-based trout feed formula that supports growth equal to standard fish meal based diets in production trials.

 

Concept4 Formula Report

Product Code: 1 ARS plant-based trout

TRIAL FORMULA (Rounded):

Code Ingredient Name Kgs Pct
69 Soy Protein Concentrate 24.64 24.640
41 Fish oil, menhaden 19.59 19.590
126 Corn Protein Concentrate 17.54 17.540
33 Wheat flour 16.27 16.270
29 Soybean meal, solvent extracted 13.30 13.300
157 MONO-DICAL PHOSPHATE 2.65 2.650
200 L - LYSINE 1.99 1.990
76 Vitamin Premix ARS 702 1.00 1.000
79 Choline CL 0.60 0.600
102 Potassium Chloride 0.56 0.560
81 Taurine 0.50 0.500
201 DL - METHIONINE 0.50 0.500
103 Sodium Chloride 0.28 0.280
88 Threonine 0.23 0.230
78 Stay-C 0.20 0.200
77 Trace mineral premix 0.10 0.100
101 Magnesium Oxide 0.05 0.050

Formula Totals: 100.00


NUTRIENT COMPOSITION: (class 1)

Number Nutrient Name Amount Units
2 DRY MATTER 93.86 PCT
3 MOISTURE 4.79 PCT
4 PROTEIN, CRUDE 40.09 PCT
5 FAT, CRUDE 20.02 PCT
6 FIBER, CRUDE 0.93 PCT
7 CALCIUM 0.56 PCT
8 PHOS. TOTAL 0.93 PCT
9 ASH 4.84 PCT
31 METHIONINE 1.17 PCT
32 CYSTINE 0.62 PCT
33 LYSINE 3.32 PCT
34 TRYPTOPHAN 0.42 PCT
35 THREONINE 1.65 PCT
36 ISOLEUCINE 1.67 PCT
37 HISTIDINE 0.91 PCT
38 VALINE 1.90 PCT
39 LEUCINE 3.97 PCT
40 ARGININE 2.22 PCT
41 PHENYLALANINE 2.06 PCT

 

Elimination of Fish Oil from the Feed

In addition to feeding fish meal free diets, there is a lot of interest in removal of fish oil from the feed. A trout feed formula is shown below that shows promise in meeting this need. This diet is currently being fed on an experimental basis at a production farm. In addition, laboratory trials are underway to further refine the levels of omega-3 fatty acid supplements needed to provide a healthful product for the consumer.

CFC4S Formula Report

Product Code: 100 ARS plant-based trout, no marine

TRIAL FORMULA (Rounded):

Code Ingredient Name Kgs Pct
69 Soy Protein Concentrate 23.64 23.640
126 Corn Protein Concentrate 17.54 17.540
33 Wheat flour 15.22 15.220
29 Soybean meal, solvent extracted 13.30 13.300
145 DHA Gold 10.55 10.550
67 Flax oil 4.00 4.000
80 Lecithin 4.00 4.000
157 MONO-DICAL PHOSPHATE 2.65 2.650
85 Corn oil 2.59 2.590
200 L - LYSINE 1.99 1.990
76 Vitamin Premix ARS 702 1.00 1.000
79 Choline CL 0.60 0.600
102 Potassium Chloride 0.56 0.560
81 Taurine 0.50 0.500
87 Astazanthin 0.50 0.500
201 DL - METHIONINE 0.50 0.500
103 Sodium Chloride 0.28 0.280
88 Threonine 0.23 0.230
78 Stay-C 0.20 0.200
77 Trace mineral premix 0.10 0.100
101 Magnesium Oxide 0.05 0.050

Formula Totals: 100.00

 

NUTRIENT COMPOSITION: (Class 1)

Number Nutrient Name Amount Units
2 DRY MATTER 93.95 PCT
3 MOISTURE 4.76 PCT
4 PROTEIN, CRUDE 41.07 PCT
5 FAT, CRUDE 17.03 PCT
6 FIBER, CRUDE 1.39 PCT
7 CALCIUM 0.49 PCT
8 PHOS. TOTAL 0.91 PCT
9 ASH 4.33 PCT
31 METHIONINE 1.24 PCT
32 CYSTINE 0.65 PCT
33 LYSINE 3.36 PCT
34 TRYPTOPHAN 0.45 PCT
35 THREONINE 1.73 PCT
36 ISOLEUCINE 2.10 PCT
37 HISTIDINE 1.15 PCT
38 VALINE 2.27 PCT
39 LEUCINE 4.37 PCT
40 ARGININE 2.08 PCT
41 PHENYLALANINE 2.18 PCT


Last Modified: 6/13/2014
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