... was studied using the diversity indices and the seasonal variation in the diversity indices was also discussed. KEY WORDS: ABUNDANCE, DISTRIBUTION, DIVERSITY INDEX, H', COMMERCIAL TRAWLER, COASTAL AREAS OF KARACHI, (NORTHERN ARABIAN SEA). INTRODUCTION Commercial trawlers along the cost of Karachi are conducting a lot of bottom trawling. One of the supports of the regional economy and fulfill the needs of protein source of the country. Little information is available in the literature on the bottom dwelling macro-faunas of the coast of Pakistan. There is thus a grate gap in our knowledge about our own marine fauna. The main reason for this paucity of information lies in the fact that scientific bottom trawling studies have not been frequently made, and in the occasional cases where undertaken, not much attention has been given to non-commercial or economically unimportant marine organisms. Hence subtidal fauna remains little stidied. Compared to the subtidal and benthic marine studies, ...

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