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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):

CodeIngredient NameKgsPct
69Soy Protein Concentrate24.6424.640
41Fish oil, menhaden19.5919.590
126Corn Protein Concentrate17.5417.540
33Wheat flour16.2716.270
29Soybean meal, solvent extracted13.3013.300
157MONO-DICAL PHOSPHATE2.652.650
200L - LYSINE1.991.990
76Vitamin Premix ARS 7021.001.000
79Choline CL0.600.600
102Potassium Chloride0.560.560
81Taurine0.500.500
201DL - METHIONINE0.500.500
103Sodium Chloride0.280.280
88Threonine0.230.230
78Stay-C0.200.200
77Trace mineral premix0.100.100
101Magnesium Oxide0.050.050

Formula Totals: 100.00


NUTRIENT COMPOSITION: (class 1)

NumberNutrient NameAmountUnits
2DRY MATTER93.86PCT
3MOISTURE4.79PCT
4PROTEIN, CRUDE40.09PCT
5FAT, CRUDE20.02PCT
6FIBER, CRUDE0.93PCT
7CALCIUM0.56PCT
8PHOS. TOTAL0.93PCT
9ASH4.84PCT
31METHIONINE1.17PCT
32CYSTINE0.62PCT
33LYSINE3.32PCT
34TRYPTOPHAN0.42PCT
35THREONINE1.65PCT
36ISOLEUCINE1.67PCT
37HISTIDINE0.91PCT
38VALINE1.90PCT
39LEUCINE3.97PCT
40ARGININE2.22PCT
41PHENYLALANINE2.06PCT

 

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):

CodeIngredient NameKgsPct
69Soy Protein Concentrate23.6423.640
126Corn Protein Concentrate17.5417.540
33Wheat flour15.2215.220
29Soybean meal, solvent extracted13.3013.300
145DHA Gold10.5510.550
67Flax oil4.004.000
80Lecithin4.004.000
157MONO-DICAL PHOSPHATE2.652.650
85Corn oil2.592.590
200L - LYSINE1.991.990
76Vitamin Premix ARS 7021.001.000
79Choline CL0.600.600
102Potassium Chloride0.560.560
81Taurine0.500.500
87Astazanthin0.500.500
201DL - METHIONINE0.500.500
103Sodium Chloride0.280.280
88Threonine0.230.230
78Stay-C0.200.200
77Trace mineral premix0.100.100
101Magnesium Oxide0.050.050

Formula Totals: 100.00

 

NUTRIENT COMPOSITION: (Class 1)

NumberNutrient NameAmountUnits
2DRY MATTER93.95PCT
3MOISTURE4.76PCT
4PROTEIN, CRUDE41.07PCT
5FAT, CRUDE17.03PCT
6FIBER, CRUDE1.39PCT
7CALCIUM0.49PCT
8PHOS. TOTAL0.91PCT
9ASH4.33PCT
31METHIONINE1.24PCT
32CYSTINE0.65PCT
33LYSINE3.36PCT
34TRYPTOPHAN0.45PCT
35THREONINE1.73PCT
36ISOLEUCINE2.10PCT
37HISTIDINE1.15PCT
38VALINE2.27PCT
39LEUCINE4.37PCT
40ARGININE2.08PCT
41PHENYLALANINE2.18PCT


Last Modified: 8/13/2016
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