IN VIVO RECOVERY AND LONG TERM EFFECT OF PHOSALONE ON TOTAL LIPID AND TRIGLYCERIDES IN FRESHWATER FISH, TILAPIA MOSSAMBICA (PETERS)M. LEELA SIVA PAR VATHI, D. CHANDRA SEKHARA REDDY AND A. NADAMUNI CHETTYAbstract Two different size groups (1g and 6g) of Tilapia mossambica (Peters) were selected and each size group divided into three subgroups. The first subgroup of fish belonging to both size groups maintained in normal uncontaminated tap water until they attained a body size of 12.0 + 0.05 g forms the control group. The second subgroup of each size group exposed for 150 days (time required for 1 g T. tnossambica top attain 12 ± 0.05 g of body size) and for 60 days (time required for 6 g T. mossambica top attain 12 ± 0.05 g of body size) to a daily sub lethal concentration (1/10th LC50) of phosalone forms the long term exposed group. The third subgroup of each size returned to normal uncontaminated waters following 7 day exposure to a daily sublethal concentration of phosalone (short term exposed) and maintained until they attained 12.0 ± 0.05g of body size forms the recovery group. Total lipid and triglyceride content of liver, muscle and gill were measured. Both size groups of control fish exhibited a positive correlation between total lipid, biomass and triglycerides, biomass. Statistically significant difference was found between control vs long term and short term exposed fishes of both size groups. In this third subgroup total lipid and triglyceride content was decreased but showed recovery after returning to normal uncontaminated waters. Phosalone effect was more in liver when compared to muscle and gill. Early recovery in gill from phosalone stress was noticed in both sizes of fish.
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