Population structure of the European anchovy, Engraulis encrasicolus (Linnaeus, 1758) in Lake Manzala, Egypt

Tamer El-Betar; Kariman Shalloof; Alaa El-Far; Mohamed Fetouh; Walid Aly; Azza El- Ganiny

doi:10.22034/ijab.v11i6.1889

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Tamer El-Betar
tamer4egypt@gmail.com
National Institute of Oceanography and Fisheries, NIOF, Egypt.
Kariman Shalloof National Institute of Oceanography and Fisheries, NIOF, Egypt.
Alaa El-Far National Institute of Oceanography and Fisheries, NIOF, Egypt.
Mohamed A. Fetouh National Institute of Oceanography and Fisheries, NIOF, Egypt.
Walid Aly National Institute of Oceanography and Fisheries, NIOF, Egypt.
Azza El- Ganiny National Institute of Oceanography and Fisheries, NIOF, Egypt.

Vol. 11 No. 6 (2023): December

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December 25, 2023

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The present study is to identify the population and stock characteristics of Engraulis encrasicolus in the Mediterranean lagoon “Lake Manzala” of Egypt. A total of 1536 specimens were collected seasonally by a local trammel net (El-Balla), from 2019 to 2021. The length ranged from 4.2 to 12.1 cm, where the dominance was of medium sizes. Two age groups were observed with a short longevity (t_max= 3.16 y). Parameters of Von Bertalanffy, L_?, and K, were estimated as 12.52 cm and 0.95 y^-1, respectively. The growth performance index (Ø) was estimated as 2.17, expressing liner growth and environmental suitability. The calculated length at first maturity (L_m) = 8.1 cm, compared to 6.9 cm of length at first capture (L_c), expressing high fishing effort. Mortality indices include: total mortality (Z) = 3.71 y^-1, and natural mortality (M) = 1.46 y^-1. According to biological reference points, F_opt = 0.73 y^-1 and F_limit = 0.97 y^-1, the fishing mortality (F = 2.25 y^-1) indicated overfishing of the anchovy stock in Lake Manzala. The current exploitation rate, E = 0.61 expressed the occurrence of overexploitation. Based on the results, reducing fishing efforts is vital to maintaining stock stability.

El-Betar, T., Shalloof, K., El-Far, A., Fetouh, M., Aly, W., & El- Ganiny, A. (2023). Population structure of the European anchovy, Engraulis encrasicolus (Linnaeus, 1758) in Lake Manzala, Egypt . International Journal of Aquatic Biology, 11(6), 505–512. https://doi.org/10.22034/ijab.v11i6.1889

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Tamer El-Betar, National Institute of Oceanography and Fisheries, NIOF, Egypt.

Researcher at Fisheries Biology Lab., NIOF, Egypt

Kariman Shalloof, National Institute of Oceanography and Fisheries, NIOF, Egypt.

Emeritus Prof. of Fisheries Biology at NIOF, Egypt

Alaa El-Far, National Institute of Oceanography and Fisheries, NIOF, Egypt.

Associate professor of Fisheries Biology, NIOF, Egypt.

Mohamed A. Fetouh, National Institute of Oceanography and Fisheries, NIOF, Egypt.

Researcher, Fisheries Biology Lab., NIOF, Egypt.

Walid Aly, National Institute of Oceanography and Fisheries, NIOF, Egypt.

Associate professor, Fisheries Biology Lab., NIOF, Egypt

Azza El- Ganiny, National Institute of Oceanography and Fisheries, NIOF, Egypt.

Emeritus Professor of Fisheries Biology, NIOF, Egypt

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