Study of Reproductive Cycle of Two Archaeogastropods, Turbo coronatus and Monodonta canalifera

Comparative studies were carried out to assess contamination impact related to shipping activity on reproductive fitness of two archaeogastropod species, Turbo coronatus and Monodonta canalifera from Manora Channel, a possible organotin contaminated site and Buleji, the reference site. This study was initiated in view of the fact that Manora Channel is a hub of shipping activity and shipping activity is concerned with organotin contamination which highly affects the marine organisms, especially gastropods. The gonadal histological examination of archaeogastropods, T. coronatus and M. canalifera was carried out to examine the possible correlation between reproductive fitness of the species and organotin contamination. In both the species ovo-testis development or ovarian spermatogenesis was not evident but spawning appeared to be better synchronized at Buleji as compare to Manora Channel the largest hub of vessel activity in Pakistan.

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