The effect of plant protein‐based diets on apparent nutrient digestibility, growth response, egesta quantity, postprandial ammonia excretion rate and serum quality of Nile tilapia

Abstract

The study assessed the effect of oilseed meal mixtures on the biological value, faecal matter output, ammonia excretion rates and serum biochemistry of Nile tilapia over 63 days. The experimental diets (PPB 1, PPB 2 and PPB 3) were formulated using four selected oilseed meals that were mixed in different protein proportions to contribute 80% of total dietary crude protein. In each diet, either one or two of the oilseed meals were the dominant protein contributor. A commercial tilapia feed was used as the control diet (CTRL). Sex‐reversed Nile tilapia fingerlings (35 g) were stocked at 20 fish per tank in a recirculation system and fed at 3% body weight of their respective diets. At the end of the study, ADCs of dry matter, crude lipid and ash were significantly (p < .05) lower in all the plant‐based diets compared with the control diet. Fish fed the control diet had significantly higher weight gain and SGR compared with the plant‐based diets. Egesta output was 127% higher in the plant‐based diets compared with the control diet. All dietary treatments exhibited a similar trend in changes in ammonia nitrogen. Nevertheless, serum metabolites levels indicated no significant differences among treatments. Although the PPBs did not affect ADC of protein and serum profile, fish growth was reduced while faecal output increased.

Microalgae for nutrient recycling from food waste to aquaculture as feed substitute: a promising pathway to eco‐friendly development

“…According to previous studies, ammonia accumulation in aquaculture systems is mainly attributed to residual feed and fish feces 37,38 . In this study, compared with algal cells which are an integrated organic unit in both dry biomass and fresh biomass, fishmeal powder is more likely to be dissolved in the water environment.…”

Systematic review and meta-analysis of the growth performance and carcass composition of Nile tilapia (Oreochromis niloticus) fed dietary copra meal

“…In the present study, copra meal was comprehensively evaluated as a fishmeal replacement for Nile tilapia (Oreochromis niloticus) diets via a systematic review and meta-analysis. Available studies (Bamba et al, 2014;Obirikorang et al, 2015Obirikorang et al, , 2016Duodu et al, 2019;Yossa et al, 2021) on the this plantbased ingredient show varied results. Thus, using peer-reviewed literatures, the current study aimed to quantitatively generalize the effects of dietary copra meal inclusions on the growth response and carcass composition of Nile tilapia O. niloticus.…”