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Effect of Low Salinity on Jade Perch Scortum barcoo Performance in a Recirculating Aquaculture System
Author(s) -
Luo Guozhi,
Zhang Na,
Tan Hongxin
Publication year - 2012
Publication title -
north american journal of aquaculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.432
H-Index - 41
eISSN - 1548-8454
pISSN - 1522-2055
DOI - 10.1080/15222055.2012.675993
Subject(s) - salinity , perch , biology , zoology , lysozyme , aquaculture , fishery , growth rate , saline , fish <actinopterygii> , ecology , endocrinology , biochemistry , geometry , mathematics
The jade perch Scortum barcoo is a new species in the developing freshwater finfish grow‐out sector. In this study, the effects of salinity (0, 5, and 10‰) on growth and several physiological indicators of jade perch were investigated. Salinity did not have a significant effect on mean weight gained, condition factor, and feed efficiency of the fish, but it significantly affected their specific growth rate during the 28‐d experiment. The levels of serum alanine transaminase and triacylglycerol did not differ significantly among the three treatment groups, but salinity did significantly affect serum cortisol level and serum lysozyme activity. Despite the elevation in circulating cortisol induced by saline conditions, growth of jade perch was not negatively affected, and the specific growth rate suggested an improved growth rate in fish held in 5‰ salinity water.