Preliminary investigation on the fish biomass in the Deep Scattering Layers of the EEZ of India

Menon, N G (1990) Preliminary investigation on the fish biomass in the Deep Scattering Layers of the EEZ of India. In: Proceedings of the first workshop on scientific results of FORV Sagar Sampada, 5-7 June 1989, Kochi.

Preview

PDF 37_Preliminary_investigation_on_the_fish_biomass_in_the_Deep_Scattering_Layers_of_the_EEZ_of_Indi.pdf Download (576kB)

Abstract

The Fishery and Oceanography Research Vessel Sagar Sampada during her cruises 1-15 along the EEZ of India during 1985 to'86 conducted surveys of the bio-composition of the DSL by using a 5 m lsaacs Kidd Midwatcr Trawl. The survey revealed that the DSL is either single layered or some times multilayered mostly occupying depths from 200 to 540 m and 20 to 100 m. These layers were found to shift vertically from depths of 200- 540 m during day to the surface during night, influenced by photoperiodic conditions. Out of a total of 563 stations surveyed, the lKMT gear sampled from 364 stations, which included day and night hauls. In additon to planktonic groups, under micronekton, fishes were the dominant item of the samples. The common fishes recorded in the DSL were myctophids, gonostomatids, Bregmaceros, eel larvae and juveniles of several other families of fishes. The estimated fish biomass varied from 0.01 to 45.5 g/ 1000 m3 in the DSL. This paper describes the distribution and abundance of fish fauna in the DSL along various latitudes, depth, seasons and their diurnal vertical migration.

Actions (login required)

View Item