Journal
AQUACULTURE REPORTS
Volume 24, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.aqrep.2022.101134
Keywords
Brooders; Larviculture; Liver; Reproduction; Thyroid
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The study demonstrates that supplementation of nano-selenium in a plant protein-based diet improves the performance of A. arabicus broodfish and larvae, with the modulation of thyroid hormones playing a role.
A feeding trial was conducted to assess the effects of nano-selenium (n.Se) supplementation in a plant protein (PP)-based diet on female Acanthopagrus arabicus broodfish and their offspring. Two basal diets were prepared: a fish meal (FM)-based diet (FM-control) as a positive control and a PP-based diet. The PP-based diet was supplemented with n.Se at five levels including 0 (PP-control, as a negative control), 0.5, 1, 2, and 4 mg/ Kg. Brooders were fed for 90 days with one of the six experimental diets. Supplementing the PP-based diet with 2-4 mg n.Se/Kg markedly enhanced survival rate in 3-day post-hatch larvae (3DPH) larvae and total body length in newly born and 3DPH larvae. Serum triiodothyronine (T3) significantly decreased in females by supplementing PP-based diet with 1-4 mg n.Se/kg, meanwhile, serum thyroxine (T4) increased in females fed 1-4 mg n.Se/kg PP-based diets. The level of serum T3 in females fed FM-based diet was lower than those fed PP-based diet without n.Se supplementation (0.6 vs. 1.9 nmol/L-1). Meanwhile, the serum T4 was markedly higher in broodfish fed the FM-based diet than those fed the PP-based diet (21.9 vs. 14.3 nmol/L-1). The levels of T3 and T4 in 3DPH larvae originating from females fed the PP-based diet without n.Se supplementation were lower than in FM-based and n.Se supplemented PP-based groups (P < 0.05). Serum alkaline phosphatase (ALP) increased in females with increasing n.Se level in the PP-based diet. The highest and lowest ALP levels were in 3DPH larvae originating from females fed PP-based diet without n.Se supplementation and those fed with 1 mg n.Se/Kg PP-based diet, respectively (P < 0.05). The results of the present study suggest supplementing 2-4 mg n.Se in a PP-based diet can improve performance in A. arabicus brooders and larvae that are associated with modulation of thyroid hormones in this species.
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