Possible effects of bottom water currents and hydrographic features on demersal fisheries off Mangalore, South Kanara

E.G. Jayaraj, M.P.M. Reddy

Abstract



Observations on bottom water currents and other hydrographic parameters at 8 stations along 2 sections in the fishing grounds off Mangalore along the west coast of India were made for one year. Simultaneously experimental bottom trawling was carried out at 4 depths in the same area. The bottom water currents were found to vary both in direction and speed from month to month. Increase in the trawl catch was observed when trawling was carried out against or across the bottom water current direction. This could be due to the increased opening of the trawl. The effect of bottom water temperature, salinity and dissolved oxygen on demersal fish catch was also investigated

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