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Effect of temperature and salinity on sex inversion in A sian S eabass ( L ates calcarifer ): relationship with plasma sex steroids concentration and aromatase activity of gonad and brain
Author(s) -
Athauda Saman,
Anderson Trevor
Publication year - 2014
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.12018
Subject(s) - biology , aromatase , gonad , lates , development of the gonads , salinity , medicine , endocrinology , zoology , fishery , fish <actinopterygii> , ecology , genetics , cancer , breast cancer
A sian S eabass which shows precocious sex inversion in cultured environment is a major impediment to maintain a proper broodstocks. Seabass grown commercially in freshwater were transported to the research facility and held in freshwater at 29°C for 4 weeks and acclimatized to the experimental conditions. Fish were daily fed with a commercial pellet (50% protein, 18 MJ kg −1 ) to satiety. Blood, brain and gonad collected before and at the end of the experiment were analysed for sex steroids level and aromatase activity. There was an increase in P lasma E 2 levels with temperature in fish at 34°C whereas no significant difference was observed at 24 and 29°C although the highest plasma T level was detected in fish at 34°C which had significantly lower level than at the beginning, except those held at 24°C in freshwater. Plasma 11‐ KT was significantly greater in fish at 24°C compared with 29 or 34°C which had clear opposite to the E 2 . Aromatase activity in brain was higher at 29°C than at either 24 or 34°C, whereas gonadal aromatase recorded highest at 34°C. These findings concluded that high temperature in culture facility induces sex inversion of A sian S eabass.