Effects of replacing fish meal by soybean meal along with supplementing phosphorus and magnesium in diet on growth performance of Persian sturgeon, Acipenser persicus |
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| Authors: | Mohamad Reza Imanpoor Tahere Bagheri |
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| Institution: | (1) Fisheries Group, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran |
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| Abstract: | Looking for replacing fish meal by cheaper and more sustainable protein sources is essential for reducing the cost of fish
feeds. Soybean meal is a suitable alternative protein sources for carnivorous fish such as Persian sturgeon, Acipenser persicus. However, it contains antinutritional factors that may affect bioavailability of minerals and lead in reduced growth. Achieving
a cost-effective diet that does not have negative effects on growth is the goal of aquaculture programs. A 10-week experiment
was conducted with Persian sturgeon (352.07 ± 5.51 g) to determine the combined effects of phosphorous (SP), magnesium and
phosphorous (SPMg), phytase (SF), phytase and magnesium (SFMg), phosphorous and phytase (SPF), phosphorous, magnesium and
phytase (SPMgF) on weight gain, feed efficiency, specific growth rate, and condition factor. A control diet was prepared with
fish meal as a control group. Inclusion of P, Mg, and phytase contents within soybean diets did not improve feed efficiency,
and still, the control diet containing fish meal showed better weight gain and feed efficiency. Among soybean meal groups,
feed efficiency and specific growth rate were significantly improved for fish fed the diet containing just phytase (SF) and
both phytase and phosphorus (P ≤ 0.05). It was true for specific growth rate and condition factor. Phytase significantly enhanced growth whether included
with or without phosphorous. This study showed that fish meal is more sufficient for Persian sturgeon, and soybean meal could
be partly an alternative protein source if phosphorous supplied for fish by incorporation with microbial phytase or phosphorous. |
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