Abstract
Length-weight relationships (LWRs) are described for 60 important pelagic and demersal fish species caught during fishing surveys using trawl fishing gear in the Eastern Mediterranean, Egypt (General Fisheries Commission for the Mediterranean GFCM-GSA 26), and the data collected from the commercial catch during the period from July 2017 to December 2018. Linear regression using natural logarithmic transformation data was performed to calculate the a and b coefficients of LWR for 60 fish populations covering 23 families, 43 genera, and 60 species inhabiting GSA 26. The samples size, minimum and maximum lengths and weights with their mean and SD, LWR constants, ± 95% confidence interval (CI) of b, r2, and the type of growth were calculated and summarized. This study reports the first LWR estimates for 35 species in the Egyptian waters of the Mediterranean Sea.
Highlights
Egyptian fisheries contribute a great deal to food security and play a very important role in the economy of the country
This study reports the first Length-weight relationships (LWRs) estimates for 35 species in the Egyptian waters of the Keywords: GFCM-GSA26, Mediterranean Sea, length-weight relationship, growth, Egypt
Demersal fishes are important species landed by the industrial and the artisanal fleet from the Egyptian coastal waters of the Mediterranean Sea constituting about 33% of total fish yield in
Summary
Egyptian fisheries contribute a great deal to food security and play a very important role in the economy of the country. The Egyptian marine fisheries yield up to 100,000 tons of a large variety of commercial fish, Mollusca and Crustacean species (62,000 and 38,000 tons from the Mediterranean and the Red Seas, respectively). The LWRs were estimated for 60 demersal and pelagic fish species that are the most dominant and commercial. Demersal fishes are important species landed by the industrial and the artisanal fleet from the Egyptian coastal waters of the Mediterranean Sea constituting about 33% of total fish yield in. To estimate the biomass of different fish populations, it is necessary to know the length-weight relationships (LWRs) of the studied species. 108.5 ± 52.6 coefficient of determination (r2 ) for 60 pelagic and demersal fish species from the Mediterranean Sea GSA 26 are given in Tables 1, 2. About 18 species had a positive allometric growth (b > 3), 20 species caught from both the bottom survey and the commercial catch in the Egyptian Mediterranean GSA 26 (Figures 1, 2)
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