Stock assessment of marine catfishes of India

Abstract

The marine catfish fishery of India during 1979-88 laid special emphasis on the stock and exfdoitation of two major species Tachysurus thalassinus and T. tenuispinis. These together constituted about 50% of the total catUsh landings of the country. Catfish production registered increase in the 1970-89 period, but the high fishing pressure in the mechanized trawl and purse seine sector resulted in non-judicious harvest of spawnets or brooders, eggs or embryos and juvenile or sub-adults of catfishes. Because of this, the yield of both the species suffered setback in the late eighties at most of the fishing centres. The exploilaticn level of T. thalassinus was 0.88 at Veraval, 0.85 at Cochin and 0.84 at Visakhapamam with corresponding Emax of 0.72,0.72 and 0.50. In Gujarat, Kerala and Andhra Pradesh the exidoitation of this species exceeded the annual average standing stocks. The exploitation rate <^ T. tenuispinis was 0.61,0.79 and 0.65 at Veraval, Mangalore and Cochin respectively. The corresponding Emu was 0.74,0.51 and 0.66. The exploitation was higher than the aimual average standing stocks in Gujarat, Kamataka and Kerala. The possible management strategies and remedial measures are discussed