STRUCTURE OF FISH ASSEMBLIES IN WEST OF BARDAWILL LAGOON, NORTH SINAI, EGYPT

Authors

1 Master's student at the Institute of Environmental Studies, Al-Arish University

2 Assistant Professor of Fishery Biology - The National Institute of Oceanography and Fisheries - Al Touloul Branch

3 Professor of Fisheries Biology and Fish Welfare, Aquaculture and Marine Fisheries, University of Al-Arish

Abstract

Bardawil Lagoon western region of depression suffers from poor environmental conditions, and the clearing Bogazes connected to the sea is considered the most important part of the lagoon maintenance. Therefore, it is important to keep the dredging quantity at a minimum level for the snorkel channels, and to dig radial channels towards the east and west of each slag to allow water circulation to maintain favorable physical and biological conditions to raise the efficiency of that area and to achieve the higher goal, which is a suitable environment and thriving fisheries. The study also showed that the qualitative and numerical variation of aquatic life in the depression was clear between the seasons of the year and the study stations, and the diversity showed a clear decrease in the fall season 2020. It also showed the dominance of bream fish, as this specie had a relatively high density relative to other species due to its presence in all locations throughout the study period, and the rate of its presence was approximately 40% of the total in the study area and reached 68.7% in Station No. 2. Regarding the relative sovereign concentration, Simpson's criterion gave the highest value to Station No. 3 in the study area (S=0.4628), while it gave the lowest value to Station No. 1 (S=0.1337) , This means that one or a few species is dominant over station No. 3, which is the least diverse, while station No. 1 is the most diverse, and dominance is concentrated in more than one species. Station No. 3 is located in the farthest part of the depression in the west, and it is the region farthest from the Bogas opening. It is considered one of the worst environments in the depression and requires great effort to revitalize it and change its environment to become an environment suitable for many species.

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