Global Research Journal of Fishery Science and Aquaculture

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Maximum sustainable yield, swept area and biomass of some biota from the Southern trawlable areas, Red Sea, Sudan


Abdalla Nassir Elawad



Abstract

 

 

Accepted 29th August, 2014

 

Recently no proper study on stock assessment has been done in Sudanese Red coast.   Estimated of marine potential ranges between 10000 to 35 000 tones and the annual production are around 8000 tons. The Maximum Sustainable Yield and the  a swept area of the trawling area for the bulk of seven categories (Saurida undosquamis, Nemipterus japonicas, Mulloides flavolineatus, Shrimp, Squid, Discard, and Other Commercial fishes) had been estimate.   The maximum   catch is high in Discard (3071.0 tons),    while the high optimum efforts appear for Squids (766 days).    The lower maximum catches for Squids (34.0 tons), and the lower effort for N. japonicas (95 days).      The maximum catch for the seven fishes categories were 4593 tons. Maximum   area swept by the trawler was in year 2004 (784.0 km2) and the lowest     for the year 1984 (20.0 km2). The higher biomass estimated in year 2004 (32521 kg/km2), and the lowest  in year 2002 (1224 kg/km2). The Potential yield due to reach the optimum annually point in year 2005 (1830 tons). Study indicates that from 1984 to 2008 the annual catch increased with increased effort. This means that more effort can be used to obtain more catch.

 

Keywords: stock assessment, trawling, maximum catch, optimum effort, discard.