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

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Relation http://eprints.cmfri.org.in/9312/
 
Title Response of a freshwater air-breathing fish, Clarias
batrachus to salinity stress: an experimental case for their
farming in brackishwater areas in Andaman, India
 
Creator Sarma, Kamal
Prabakaran, K
Krishnan, K
George, Grinson
Anand Kumar, A
 
Subject Tropical fish
 
Description 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.
 
Date 2012
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/9312/1/93.pdf
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.