Fish Meal vs Soy Protein Concentrate for Aquafeed
Soy protein concentrate (SPC) is the plant protein of choice for salmon feed globally, and increasingly for shrimp and marine species. It replaces a meaningful share of fish meal cost while meeting digestibility and anti-nutritional targets that ordinary soybean meal cannot.
Short answer: Fish meal typically supplies 62–72% crude protein with a complete amino-acid profile, high digestibility and strong palatability, while soy protein concentrate typically supplies 60–70% crude protein with most anti-nutritional factors removed but lower methionine and no marine lipids. Partial replacement of fish meal with soy protein concentrate is routine in salmonid, shrimp and tilapia diets when the formula is rebalanced for methionine, lysine, taurine, phosphorus and attractants; how far the substitution can go depends on species, life stage and the rest of the formulation. Compare the two on landed cost per unit of digestible protein rather than price per tonne, and validate any change with a qualified aquaculture nutritionist before commercial production.
Fish meal (65% CP)
- Best amino acid profile and DHA/EPA content
- Palatability leader in starter diets
- Recognised across all aquaculture markets
- Highest cost, limited by fishery quotas
- Sustainability scrutiny in EU salmon industry
- — Marine finfish starter and larval diets
- — Shrimp broodstock and PL diets
Soy protein concentrate (SPC, 60–65% CP)
- Significantly cheaper per unit protein
- Anti-nutritional factors reduced vs SBM (removed alcohol-solubles)
- Sustainable, non-fishery-dependent supply
- GMO/non-GMO options for EU salmon feed
- Lower palatability than fish meal — often needs attractants
- No taurine, DHA, EPA — must be supplemented
- Premium over SBM (typically USD 300–500/MT)
- — Salmon grow-out feed (industry default plant protein)
- — Shrimp grow-out at 15–25% inclusion
- — Buyers with sustainability targets or MSC-linked pricing
| Criterion | Fish meal (65% CP) | Soy protein concentrate (SPC, 60–65% CP) |
|---|---|---|
| Typical landed cost / MT (indicative only — confirm against live offers) | USD 1,650–2,100 | USD 800–1,050 (EU spec, non-GMO premium extra) |
| Impact in salmon grow-out diet | Baseline protein cost | USD 60–120/MT feed saving at typical inclusion |
| Metabolizable energy (fish) | ~4,100 kcal/kg (species-dependent) | ~3,800 kcal/kg |
| Quality risk to monitor | TVN, histamine, oxidation, salmonella | Trypsin inhibitor residuals, oligosaccharides, particle size |
SPC has largely replaced fish meal at grow-out stage in Norwegian and Chilean salmon feed formulas. Fish meal remains dominant in starter diets and in shrimp broodstock. Contract SPC to specific ANF residual specs (trypsin inhibitor, oligosaccharides) — not all SPCs perform equally in aquafeed.
Frequently asked questions
What ANF spec should I demand from SPC suppliers?
Is non-GMO SPC required for EU salmon feed?
Can SPC fully replace fish meal?
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