Open AccessEvaluation of the Dietary Toxic Level of Selenium (Se) in Juvenile Olive Flounder, Paralichthys olivaceus
Author(s) -
Lee Seunghyung,
Lee JunHo,
Bai Sungchul C.,
Hung Silas S. O.
Publication year - 2010
Publication title -
journal of the world aquaculture society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.655
H-Index - 60
eISSN - 1749-7345
pISSN - 0893-8849
DOI - 10.1111/j.1749-7345.2010.00364.x
Subject(s) - paralichthys , olive flounder , biology , zoology , juvenile , selenium , feed conversion ratio , fish meal , fish <actinopterygii> , weight gain , fishery , body weight , endocrinology , ecology , chemistry , organic chemistry
A 10‐wk feeding trial was conducted to evaluate the dietary toxic level of selenium (Se) in juvenile olive flounder, Paralichthys olivaceus . Fish averaging 5.0 ± 0.1 g (mean ± SD) were fed one of the seven semipurified diets containing 0.61, 4.13, 7.38, 18.6, 35.9, 66.0, and 146 mg Se/kg (Se0.61, Se4.13, Se7.38, Se18.6, Se35.9, Se66.0, and Se146, respectively) in the form of selenomethionine (SeMet) for 10 wks. At the end of the 10‐wk feeding trial, fish fed diets containing more than 35.9 mg Se/kg showed 100% mortality, and fish fed Se18.6 diet showed significantly higher mortality than did fish fed Se0.61, Se4.13, and Se7.38 diets. There was no significant difference in mortality among fish fed Se0.61, Se4.13, and Se7.38 diets during the experimental period. The mortality of fish fed Se66.0 and Se146 diets were significantly increased as compared with fish fed other diets at the end of 2nd wk of the feeding trial, and the mortality of fish fed Se35.9, Se66.0, and Se146 diets was 100% at the end of 6th wk of the feeding trial. Fish fed Se7.38 and Se18.6 diets showed significantly lower weight gain (WG), feed efficiency (FE), specific growth rate (SGR), and protein efficiency ratio (PER) than did fish fed Se0.61 diet. Fish fed Se4.13 and Se7.38 diets for 10 wks showed no significant differences in WG, FE, SGR, and PER. The pattern of Se accumulation in the gill, kidney, muscle, and liver tissues was dose dependent, except that the kidney tissue of fish fed diets containing more than 7.38 mg Se/kg reached a plateau. Histopathological lesions in the kidney were only observed in fish fed a diet that contained more than 7.38 mg Se/kg.These results indicated that a dietary Se level above 7.38 mg Se/kg is likely toxic, and with a long‐term feeding trial, a dietary Se level of 4.13 mg Se/kg may cause toxic effects in juvenile olive flounder.