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Dietary phosphorus affected growth performance, body composition, antioxidant status and total P discharge of young hybrid sturgeon (♀ Huso huso × ♂ Acipenser schrenckii ) in winter months
Author(s) -
Jin J. L.,
Wang C. F.,
Tang Q.,
Xie C. X.,
Dai Z. G.
Publication year - 2012
Publication title -
journal of applied ichthyology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.392
H-Index - 62
eISSN - 1439-0426
pISSN - 0175-8659
DOI - 10.1111/j.1439-0426.2012.02024.x
Subject(s) - huso , sturgeon , biology , zoology , glutathione peroxidase , catalase , alkaline phosphatase , antioxidant , superoxide dismutase , phosphorus , food science , biochemistry , fishery , chemistry , enzyme , fish <actinopterygii> , organic chemistry
Summary An 8‐week feeding trial was carried out using young hybrid sturgeon ( ♀Huso huso × ♂Acipenser schrenckii ) to study the effects of dietary phosphorus (P) on growth performance, body composition, liver and serum antioxidant status as well as the effluent P content in the wintertime. Four puffed pellet diets were formulated to contain graded total P levels at 0.63, 1.15, 1.85, and 2.12%, respectively. Triplicate groups of hybrid sturgeon (494.21 ± 18.63 g) were reared in concrete ponds (2.0 × 1.2 × 1.4 m), and fed one of the four diets for 8 weeks. Weight gain and feeding rate significantly decreased with increasing dietary P content, and fish fed the 2.12% P diet had negative growth. With the increase in dietary P, whole body ash and P content significantly increased. There was no inverse relationship between the whole body lipid content and dietary P level in young hybrid sturgeon. Hybrid sturgeon liver exhibited higher superoxide dismutase, catalase and glutathione peroxidase activities in the 0.63 and 1.15% dietary P treatment groups than those in the other two groups. Serum alkaline phosphatase activity increased significantly with increasing dietary P. Discharge of P into the pond increased significantly with increasing dietary P. In conclusion, a dietary P content between 0.63 and 1.15% helped young hybrid sturgeon to activate their antioxidant defense system and eradicate the free radicals, in order to reduce the antioxidant damage, while still keeping total P content in the pond at a relatively low level during the winter months.