Journal of the Marine Biological Association of India

Volume 30 Issue 1&2

Bathymetric distribution of the marine prawn Metapenaeus dobsoni Miers off Cochin, Kerala.

V. Thangaraj Subramanian

Although M. dobsoni was recorded upto a maximum depth of 34 m, major part of the fishery occurred in the 6-15 m depth zone. An inverse relationship between abundance and depth was apparent, as revealed by the overall catch-rate of 2.20,0.92 and 0.13 kg hr. at<10 m, 15m> and ^ 20m, respectively. The occurrence of higher proportion of larger specimens of both sexes was obvious from the overall mean-size of 69.2, 73.4 and 82.3 mm for males and 78.2, 87.3 and 94.6 mm for females recorded at the corresponding depths. The proportion of females in population also progressively increased with depth and about 90% of the overall individuals inhabiting > 20m depths were females, of which about 80% were spawners. Immature females and relative proportion of males in population were more at 10m depths.

Date : 31-12-1988