SEASONAL VARIATIONS IN THE ABUNDANCE OF PENAEID PRAWN SEED IN RELATION TO ENVIRONMENTAL PARAMETERS IN THE SEED GROUNDS OF COCHIN BACKWATERS
S. Easo, K. Mathew
1989
Citations
12
Citations
Journal
Indian Journal of Fisheries
Semantic Scholar
Key Takeaway Key Takeaway: Seasonal variations in abundance of Penaeus prawn seed in Cochin backwaters show a relationship with environmental parameters, with P. indicus being most abundant during premonsoon and M. dobsoni during monsoon.
Abstract
Early juveniles of Penaeus indicus, Metapenaues dobsoni and M. monoceros were collected from two centres in the shallow water areas in the Cochin backwaters where commercial seed collectors used to make their, prawn seed collections. A Quantitative Seed Sampler was used during premonsoon, monsoon and postmonsoon period of 1988. The study enabled to understand the relative abundance and seasonal vari ations of commercially important prawn seed of the above species. Of the total seed collected P. indicus formed 26%, M. dobsoni 59% and M. monoceros 15%. The seed exhibited considerable fluctuation in abundance through various seasons. Seventy per cent of the total seed of P. Indicus were collected during premonsoon period. But in the case of M. dobsoni, the highest percei>tage of 62 was obtained during monsoon period. The seed of M. monoceros had the maximum of 55% during monsoon period. Seed of P. indicus occurred at a maximum rate of 28/m' during April-May, that of M. dobsoni 20/m' and M. monoceros 7/m'during June to August. The relationship of the seed to the environment is also discussed.