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Title: Benthic production and assessment of demersal fishery resources of the Indian Seas
Authors: Parulekar, A H
Harkantra, S N
Ansari, Z A
Issue Date: Jun-1982
Publisher: NISCAIR-CSIR, India
Abstract: Quantitative study on the benthos (macro and meio) and its possible relationship with the demersal living resources in the 62 x 106 km2 area of the Indian Seas (between lat. 24ᵒ 30' to 5ᵒ N and long 97ᵒ to 65ᵒE) shows that biomass production varies from 0.01 to 601 gm-2 with mean values of 17.6, 7.3, 5.5 and 0.7 gm-2 in the Arabian Sea, the Andaman Sea, the Bay of Bengal and the Lakshadweep Sea, respectively. The shelf produces maximum biomass and the production decreases with the increasing depth. Richness of benthos in the Arabian Sea is related to the upwelling phenomenon while the high biomass values in the Northern Bay of Bengal is due to riverine enrichment. Macrobenthos dominates the shelf whereas meiobenthos contributes more than 70% in the slope and the deep sea (above 1000 m), region. Annual benthic production is maximum (x = 3.7 gCm-2 yr-1) along the southwest (between lat. 12 and 7ᵒN) coast of India. Other areas of high production are the northwest part of Arabian Sea and the Northern Bay of Bengal. Potential yield of demersal fish and crustaceans is assessed to vary from 28 kg/ha along the shelf of Lakshadweep to 909 kg/ha off the West Bengal shelf. An overall threefold increase in the exploitation of demersal resources is envisaged. The potential resources have been estimated as 1.8 million tonnes out of which the shelf alone can sustain an annual yield of 1.2 million tonnes. The relevance of benthic standing crop for the estimation of marine living resources is discussed.
Page(s): 107-114
ISSN: 0975-1033 (Online); 0379-5136 (Print)
Appears in Collections:IJMS Vol.11(2) [June 1982]

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