I= EFFECT OF SOME COMMONLY USED INSECTICIDES ON THE BIOLOGY OF COLISA FASCIATA (OSPHRONEMIDAE) WITH SPECIAL REFERENCE TO FECUNDITY AND DEVELOPMENT
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Title of Thesis
EFFECT OF SOME COMMONLY USED INSECTICIDES ON THE BIOLOGY OF COLISA FASCIATA (OSPHRONEMIDAE) WITH SPECIAL REFERENCE TO FECUNDITY AND DEVELOPMENT
Author(s)
Javed Iqbal
Institute/University/Department Details
University of the Punjab
Session
1994
Subject
Zoology
Number of Pages
185
Keywords (Extracted from title, table of contents and abstract of thesis)
insecticides, hatchability, fecundity, diazinon, gametogenesis, teratogenicity, teleost, calisa fasciata

Abstract
The effect of lethal and sublethal concentrations of organophosphorus insecticide, Diazinon on the behaviour. gametogenesis. fecundity. hatchability, survival, growth, teratogenicity and larval toxicity in a freshwater teleost, Calisa fasciata were studied in the laboratory conditions. The adult fish were exposed to different chronic and acute doses of the insecticide during the prespawning phase of their gonads.

The behavioral activity of fish changed with convulsions, jerky movements and loss of equilibrium. In acute exposure of higher concentration, the response was found to be more pronounced than in lower concentrations. Mature oocytes (= fecundity) and sperms decreased in number significantly in all the treated groups in a dose dependent manner. Hatchability of eggs was also investigated to decrease in a dose dependent fashion, however, it further decreased when eggs were obtained from the exposed mother fish. Moreover, the eggs from chronically exposed fish showed significantly less hatchability than the eggs from the acutely exposed fish.

Thus all biological parameters studied were found to be negatively affected by Diazinon. These effects were found to be dose-dependent as well as related with the type and period of exposure of the fish to the insecticide.

Teratogenicity in terms of notochordal distortion and pigmentation of skin and eyes was found following application of higher concentrations of the insecticide. The larvae of chronically exposed mother fish were found to be more resistant to the insecticide than the larvae of the acutely exposed or unexposed fish.
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S. No. Chapter Title of the Chapters Page Size (KB)
1 0 Contents
507.1 KB
2 1 Introduction 3
1014.11 KB
3 2 Materials and methods 22
531.64 KB
4 3 Results 32
3068.74 KB
5 4 Discussion 111
667.01 KB
6 5 References 127
940.88 KB
7 6 Appendices 158
155.28 KB