Abstract
AbstractThe physiological status of euryhaline teleost is regulated by environmental salinity through different mechanisms. This chapter discusses the salinity to the juvenile golden pompano Trachinotus ovatus (Linnaeus 1758) rearing performance impact.Rearing salinity significantly affected fish growth and the RNA/DNA ratio. When the salinity was 34‰, the fish growth rate and RNA/DNA ratio were higher. The effect of salinity on pepsin activity was not significant. However, rearing salinity had a significant effect on α-amylase activity. The α-amylase activity of fish reared at the salinity of 10‰ was significantly lower than fish at the salinity of 34‰. Raising salinity has significant effects on FCR of juvenile golden pompano. The FCR of fish cultured at the salinity of 10‰ was five times higher than the FCR of fish reared at 34‰. The GPX activity was highest when the salinity was 26‰ and lowest when the salinity was 34‰. The activities of SOD of fish reared at 18‰ and 34‰ were significantly higher than those reared at 10‰ and 26‰. The lowest activity of Na+K+-ATPase was obtained in fish at 34‰, while the highest activity of Na+K+-ATPase was obtained when fish at 18‰. Juvenile golden pompano can be reared above 26‰ without affecting fish performance, and the salinity <18‰ is not suitable for the growth of juvenile golden pompano.KeywordsSalinityRearing performanceDigestive enzyme activityAntioxidant enzymeNa+K+-ATPase Trachinotus ovatus
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