SURVIVAL AND HISTOLOGICAL ALTERNATIONS IN JUVENILE TIGER SHRIMP EXPOSED TO SAPONIN

T.S. Nagesh, N. Jayabalan, C.V. Mohan, T.S. Annappaswamy, T.M. Anil-1999

Aquaculture International, 7 (3): 159-167

Abstract:

Survival and shell quality of juvenile tiger shrimp, Penaeus monodon, exposed to a plant derived toxicant, saponin, were investigated. The 96 h LC 50 was 132.07 mg/l of saponin. The juvenile tiger shrimp tested against 5, 10, 15 and 20% concentrations of the 96 h LC 50 value of saponin for 3, 6, 9, 12, 15 and 18 days recorded shell softening ranging from 3.33 to 60% of the individuals. The percentage of shell softening in the treated shrimps was dependent on both concentration and duration of exposure. The cuticular layers of soft-shelled shrimps were thinner and often had wrinkled surfaces which usually disrupted and seperated from the epidermis. In the hepatopancreas of the soft-shelled shrimps, the major alternations were the degeneration of hepatopancreatic tubules, separation of basal laminae from the tubules and reduced lumen of tubules.

(Department of Fisheries Resources & Management, College of Fisheries, Mangalore-575 002, Karnataka, India)

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