Comparative Assessment of Plasma Cortisol and Heat Shock Protein 70 Expression as Indicators of Temperature Stress in Nile Tilapia (Oreochromis niloticus Linn.)

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Phongchate Pichitkul
Yont Musig
Prapansak Srisapoome
Wara Taparhudee
Suriyan Tunkijjanukij
Prathak Tabthipwon
Nontawith Areechon

Abstract

Comparative assessment of plasma cortisol and expression of Heat Shock Protein 70 gene (HSP70) from gill tissue as indicators of temperature stress in Nile tilapia (Oreochromis niloticus) was investigated. In this study, water temperature at 22, 27 and 32°C was the stressor. Results revealed that the concentration of plasma cortisol responded to temperature stressors at irregular patterns as compared to its response to ambient water temperature. In contrast, fish reared at 22 and 32°C showed significantly higher levels ofHSP70 expression than those exposed at control temperature (27°C), at 3 and 6 hours after stress induction (P<0.05). However, during 12-168 hours, a significant difference in HSP70 expression was observed only in fish exposed at 32°C water. Studies on correlation between temperature and the severity of Streptococcosis infection in Nile tilapia revealed that fish challenged with Streptococcus agalactiae through immersion at 32°C for 21 days had significantly higher mortality than fish challenged at lower temperatures (P<0.05). Accumulative mortality rate of31.67% was observed in 32°C fish while only 8.33±1.53% and 8.33±0.58% were observed in fish reared in 22 and 27°C water, respectively. This study indicated that the expression of HSP70 gene may be an indicator of temperature stress in Nile tilapia. Since the HSP70 is an important molecule of fish that can respond to various stressors in order to regain the homeostasis of the body, results from this study provide valuable information for further research to investigate whether HSP70 expression can be used specifically as a reliable indicator for other stressors.

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Pichitkul, P., Musig, Y., Srisapoome, P., Taparhudee, W., Tunkijjanukij, S., Tabthipwon, P., & Areechon, N. (2015). Comparative Assessment of Plasma Cortisol and Heat Shock Protein 70 Expression as Indicators of Temperature Stress in Nile Tilapia (Oreochromis niloticus Linn.). Journal of Fisheries and Environment, 39(1), 12–28. Retrieved from https://li01.tci-thaijo.org/index.php/JFE/article/view/80546
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