Response of a freshwater air-breathing fish, Clarias batrachus to salinity stress: an experimental case for their farming in brackishwater areas in Andaman, India

Sarma, Kamal and Prabakaran, K and Krishnan, K and George, Grinson and Anand Kumar, A (2012) Response of a freshwater air-breathing fish, Clarias batrachus to salinity stress: an experimental case for their farming in brackishwater areas in Andaman, India. Aquaculture International. pp. 1-14.

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    Abstract

    The study was conducted to assess the effects of salinity on growth and biochemical composition of freshwater catfish, Clarias batrachus. A static nonrenewable acute toxicity bioassay test was conducted and LC50 of salinity for 96-h exposure to the fingerling (14.5 cm) was 12.52 %. Based on these results, two sublethal salinity levels, viz. 4 and 8 %were selected to study the long-term effects of salinity on C. batrachus for a period of 90 days. From the study, it was found that growth and survival rate were less in saline water (4 and 8 %). Maximum growth and survival were recorded in freshwater (0 % salinity) and subsequently at 4 and 8 %. To assess the biochemical alteration, few important biomarkers were estimated. At the end of 90 days rearing period, glucose level in the brain and blood of C. batrachus was found to decrease with salinity. The level of liver and muscle glycogen in the fish reared at 4 % was lower than that of control. Ascorbic acid in all organs under study was found to decrease with increasing salinity, which was attributed to stress mitigation effect of vitamin C. Acetylcholine esterase (AchE) activity recorded a gradual decrease with increasing salinity. Metabolic enzymes, alkaline phosphatase (ALP) activity and adenosine triphosphosphtase (ATPase) activity also reduced both in liver and muscle tissues with increasing salinity. From the present investigation, it can be concluded that exposure to higher salinity significantly (P\0.01) affects the growth and physiological response of Clarias batrachus.

    Item Type: Article
    Uncontrolled Keywords: Ascorbic acid; Glucose; Stress; Enzyme; Catfish
    Subjects: Aquaculture > Tropical fish
    Divisions: CMFRI-Kochi > Marine Capture > Fishery Resource Assessment
    Subject Area > CMFRI > CMFRI-Kochi > Marine Capture > Fishery Resource Assessment
    CMFRI-Kochi > Marine Capture > Fishery Resource Assessment
    Subject Area > CMFRI-Kochi > Marine Capture > Fishery Resource Assessment
    Depositing User: Arun Surendran
    Date Deposited: 16 Jul 2013 09:20
    Last Modified: 09 Sep 2015 15:54
    URI: http://eprints.cmfri.org.in/id/eprint/9312

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