Soy protein concentrate as a substitute for fish meal in diets for juvenile Acanthopagrus schlegelii: effects on growth, phosphorus discharge and digestive enzyme activity

Abstract

The current high demand and cost of fish meal (FM) necessities the evaluation of alternative plant protein ingredients in diets of farmed marine fish. A 56‐day feeding trial was performed to study the effects of replacement of FM with soy protein concentrate (SPC) in diets of Acanthopagrus schlegelii. Diets were prepared at levels of 0%, 30%, 47.5%, 65%, 82.5% and 100% SPC, respectively, replacing FM. The results indicated no significant differences (p > .05) in % weight gain (WG) and specific growth rate of fish fed S30% to S82.5% diets compared with the control diet while, further inclusion at 100% significantly depressed growth performance. SPC inclusion and phytase supplementation significantly affected the phosphorous discharge (P‐load) showing lowest value (3.83 ± 0.53 g/kg WG) in S100% compared to control (14.79 ± 0.37 g/kg WG) and in fish fed S30% diet (13.24 ± 0.89 g/kg WG) (p < .05). The results of this study showed that FM could be substituted up to 82.5% by SPC in the diet of Acanthopagrus schlegelii fingerlings (5.53 ± 0.12 g) without any adverse effects. Phytase supplementation SPC based diets could be effective in reducing the phosphorus load in the aquatic culture environment.

Partial replacement of fishmeal with Clostridium autoethanogenum single‐cell protein in the diet for juvenile black sea bream ( Acanthopagrus schlegelii )

“…The data of PD in this study are similar to those of previous studies on black sea bream (Kalhoro et al, 2018;Ngandzali, Zhou, Xiong, Shao, & Xu, 2011). In this study, the PRE increased and PD decreased significantly with the increasing substitution level of CAP, which indicated that the partial substitution of fishmeal with CAP could reduce the release of phosphorus.…”

“…Under the experimental conditions, the survival of fish fed with different levels of CAP were all above 96%, which indicated that black sea bream adapted to the culture conditions and experimental feed in this study (Kalhoro et al, 2018;Sun et al, 2015). All fish appeared healthy and actively feeding at the end of the feeding trial.…”

“…Some plant protein sources, such as SPC, have been reported to reduce the digestive enzyme activity of black sea bream due to the existence of antinutritional factors (Kalhoro et al, 2018). Some plant protein sources, such as SPC, have been reported to reduce the digestive enzyme activity of black sea bream due to the existence of antinutritional factors (Kalhoro et al, 2018).…”

The effects of different fishmeal level diets with or without phytase supplementation on growth performance, body composition, digestibility, immunological and biochemical parameters of juvenile hybrid sturgeon ( Acipenser baeri Brandt ♀ × A. schrenckii Brandt ♂)

“…Carter and Sajjadi () discovered that 4,000 U/kg phytase significantly increased the feed intake, final weight and weight gain of Atlantic salmon when fish fed the low fishmeal diets containing soy protein concentrate. Similarly, Kalhoro et al () also found that the fishmeal replacement by 30% soy protein concentrate did not significantly affect growth performances in the black sea bream ( Achanthopagrus schlegelii ) fed diet supplementary 2% phytase after 56‐day feeding when compared with the control. Interestingly, the present study showed that supplement of phytase in diets without exogenous addition of inorganic phosphorus had no significant negative effect on the growth performance of the hybrid sturgeon.…”

Effects of feeding a fish meal-free soy protein concentrate-based diet on the growth performance and nutrient utilization of red sea bream (Pagrus major )

“…In red sea bream, 50%–66% of FM protein could be replaced with SPC without any negative effects on its growth performance (Biswas et al, ; Hossain & Koshio, ). In contrast, the use of over 66% dietary SPC caused significant growth retardation in red sea bream, which was associated with low‐feed intake (Hossain & Koshio, ; Kader et al, ; Kalhoro et al ). Hossain and Koshio () also reported that the complete replacement of FM protein with SPC reduced the growth rate of red sea bream, with the reason for the low‐growth rate being unclear to date.…”