Table 14.
Brewery byproducts as substitute for fishmeal in diet of different fish species.
| Fish species | Brewery byproducts | Tested Inclusion levels | Duration | Optimum inclusion Level |
Effects | Reference |
|---|---|---|---|---|---|---|
| Rainbow trout (O. mykiss) | Dry & hydrolyzed spent yeast (DSY & HSY) & spent grains (DSG & HSG) | 10 & 20% of DSY, HSY & 7.5% & 15% of DSG & HSG to the basal mixture | 60 days | 20% yeast & 15% spent grain | ↑ final weight, protein digestibility & food conversion, No change in muscle nutritional composition | [220] |
| European seabass (Dicentrarchus labrax) | Fermented brewer's spent grain (BSG) | Control, 0.4 & 0.8% BSG-extract pretreated + direct inclusion | 66 days | Pretreated 0.4% BSG-extract | ↑ Dietary reducing sugars content, antioxidant activity & cellulase and xylanase activities No effect on growth performance & whole-body composition ↑Feed efficiency & protein utilization |
[221] |
| Rainbow trout (O. mykiss) & Gilthead seabream (S. aurata) |
Spent yeast & Spent grain | Dry & hydrolyzed spent yeast & spent grains | 30 days | 20–30% brewers' spent yeast & spent grain | Good protein, lipid & amino acid digestibility | [222] |
| Striped catfish, (Pangasianodon hypophthalmus) | Brewer's spent grains (BSG) | SBM replaced by 0, 25, 50, 75 or 100% of BSG | 50% | Improvement in growth performance, nutrient utilization and feed conversion upto 50% | [223] | |
| Nile Tilapia, (O. niloticus) | Brewer's waste | 25, 50, 75 & 100% | 70 days | 50% | ↓ Feed intake & utilization with increase level no adverse effect on growth and feed utilization upto 50% | [224] |
| Thai Panga (P. hypophthalmus × Pangasius bocourti) |
Brewer's yeast (Saccharomyces cerevisiae) | 30, 45, 60 or 75% | 9 months | 45% | Improved growth performance & immune response No effect on feed efficiency, blood hematology & meat quality ↑ lysozyme activity & total immunoglobulin (Ig) |
[225] |