الفهرس 
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Abstract
Abstract
Trawling is an important fishing method used by fishermen in the Gulf of Suez, the trawl fishery in Gulf of Suez is known to have very low selectivity, which may not be a responsible fishing practice. The trawl nets of the fishery retain a large numbers of juvenile individuals, which has negative effects on the marine resources. In the present study the selectivity of 5.5 cm diamond-mesh codend, 5.5 cm T90 and 4.5 cm square-mesh codend in Gulf of Suez demersal trawl fishery have been compared. The results suggested that the T90-mesh codend 5.5 cm had better selection properties to the species compared to both the 5.5 DM and 4.5 SM meshed cod-end. This study showed that the current mesh size of the diamond mesh (2.5cm) at the codend had very poor selectivity performance. An increase and change in shape of mesh sizes used by the fishery to the legal mesh size would help to increase the selectivity for lizardfish, threadfin bream, goat fish, yellow fin bream, striped piggy, Goggle eye and horse- mackerel. In addition, increasing the current codend mesh size to match the legal mesh size would help to reduce the catch of trash fish significantly.
In the present study, the maximum reduction of discards was represented in April 2014 by 47.6% while the minimum reduction of discards was represented in November by 37.8%. Also the highest value of percent of reduction 49.7% for T905.5 while the lowest value was 38.7 % for DM 5.5 cm. Relative fish species abundance and biomass were estimated from two surveys along the Gulf of Suez. These results indicated that the biomass differs according to fishing season and fishing area.
Furthermore, a study of the biological and dynamical characteristics of three Nemipterus species in the Gulf of Suez with special refer to fishery statistics, age, and growth and reproduction, the results of biological study were helpful in giving information which helps in the proper management of the Gulf fishery.