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Impact of water temperature and sodium chloride (NaCl) on stress indicators of hybrid catfish (Clarias gariepinus Burchell x C. macrocephalus Gunther)

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Author(s): Weena Koeypudsa | Malinee Jongjareanjai

Journal: Songklanakarin Journal of Science and Technology
ISSN 0125-3395

Volume: 33;
Issue: 4;
Start page: 369;
Date: 2011;
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Keywords: sodium chloride | stress indicator | stress reduction | fish health | fish blood

ABSTRACT
This research was composed of 2 experiments. Short-term (1 day) and long-term (30 days) exposure were conductedin the laboratory. Each experiment had 2 temperature levels, high (Ht, 29.5 ± 0.5C) and low temperature (Lt, 19.5 ± 0.5C).Initial weight and length of catfish were 7.54±1.82 g and 9.90±0.96 cm respectively. Experimental catfish were subjected to 4conditions as follows: high temperature with 0.1% sodium chloride (HtWs), high temperature without 0.1% sodium chloride(HtW/s), low temperature with 0.1% sodium chloride (LtWs), and low temperature without 0.1% sodium chloride (LtW/s).Blood was taken from caudal vessel of anaesthetized fish to investigate blood clotting time, cortisol, glucose, osmolarity,Na+, K+ and Cl-. Ratios of Na+/K+, Na+/Cl- and Na+ + K+ / Cl- were also analyzed. In the short-term (1 day) experiment, values ofall catfish blood parameters varied. These imply that catfish attempt to maintain internal balance, homeostasis. Osmolarityexhibited complete homeostasis in 2 h. From long-term (30 days) exposure, non-significant means of Na+/Cl- ratio (HtWs)and decreasing trend lines direction of blood clotting time (HtWs, LtW/s, LtWs) indicated that 0.1% sodium chloride and/orLt helped stress reduction in catfish. Sum of Na+ and K+ to Cl- ratio among 4 groups (HtW/s, HtWs, LtW/s, LtWs) revealedthat catfish spent 10 days for adjustment themselves under stress circumstance (HtWs, LtW/s, LtWs) to natural situation(HtW/s). This information could be useful to improve the survival rate and health condition during rearing, handling andtransporting aquatic animals.
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