A critical study of the bad effects of upwelled waters on fisheries, as exempted by the situation of the Kerala-Karnataka region of the west coast of India

摘要

The inter-seasonal oscillation of the deoxygenated layer off the Kerala-Kamataka Coast udand its encroachment to shallower regions of the shelf due to upwelling and its effects on udboth demersal and pelagic fisheries of the region were studied in detail. The results in broad, indicated that the oxygen depletion worked out differently on pelagic and demersal groups of fishes udstressing the need for studies of tolerance limits of different species of fishes for deoxygenation of udwaters and the toxic effects of bacteria on fishes, as upwelling areas are known for heavy bacterial loads.