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Population Dynamics and Management of Two-barred Seabream Acanthopagrus bifasciatus in the Red Sea, Egypt

Received: 1 August 2019     Accepted: 25 October 2019     Published: 31 October 2019
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Abstract

The present study is the first study on the population dynamics and management of the Acanthopagrus bifasciatus in the Egyptian sector of Red Sea. A total of 729 specimens were monthly collected from the Egyptian Red Sea during January 2015 to December 2015. Results showed that, the longevity of A. bifasciatus is 9 years in the Egyptian Red Sea and age group three was the most frequent one for combined sexes forming up to 26.61% of the total catch. The age group one was absent in the collected samples and the highest growth in length was observed at the end of the second year of life (24.6 cm) after which the annual increment decreases gradually with increase in age. The growth in weight was isometric. The length at first capture was 25.31 cm with corresponding age 2.22 year. The total, natural and fishing mortality were estimated as 1.99, 0.46 and 1.53 yr-1, respectively. The exploitation ratio E was estimated at 0.77 indicating a high level of exploitation. The yield per recruit analysis showed that the present level of fishing mortality is much higher than that gives the maximum yield per recruit by about 48% and the reduction of current level of fishing mortality coefficient from 1.53 to 0.8 / y will be associated with an increase in the yield per recruit from 242.71 to 250.56 g (≈3%).

Published in International Journal of Ecotoxicology and Ecobiology (Volume 4, Issue 4)
DOI 10.11648/j.ijee.20190404.11
Page(s) 80-87
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This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

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Copyright © The Author(s), 2019. Published by Science Publishing Group

Keywords

Population Dynamics, Management, Acanthopagrus bifasciatus, Egyptian Red Sea

References
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    Samia Mohsen El-Mahdy, Sahar Fahmy Mehanna, Usama Mohammed Mahmoud, Fahmy Ibrahim El-Gammal. (2019). Population Dynamics and Management of Two-barred Seabream Acanthopagrus bifasciatus in the Red Sea, Egypt. International Journal of Ecotoxicology and Ecobiology, 4(4), 80-87. https://doi.org/10.11648/j.ijee.20190404.11

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    Samia Mohsen El-Mahdy; Sahar Fahmy Mehanna; Usama Mohammed Mahmoud; Fahmy Ibrahim El-Gammal. Population Dynamics and Management of Two-barred Seabream Acanthopagrus bifasciatus in the Red Sea, Egypt. Int. J. Ecotoxicol. Ecobiol. 2019, 4(4), 80-87. doi: 10.11648/j.ijee.20190404.11

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    AMA Style

    Samia Mohsen El-Mahdy, Sahar Fahmy Mehanna, Usama Mohammed Mahmoud, Fahmy Ibrahim El-Gammal. Population Dynamics and Management of Two-barred Seabream Acanthopagrus bifasciatus in the Red Sea, Egypt. Int J Ecotoxicol Ecobiol. 2019;4(4):80-87. doi: 10.11648/j.ijee.20190404.11

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  • @article{10.11648/j.ijee.20190404.11,
      author = {Samia Mohsen El-Mahdy and Sahar Fahmy Mehanna and Usama Mohammed Mahmoud and Fahmy Ibrahim El-Gammal},
      title = {Population Dynamics and Management of Two-barred Seabream Acanthopagrus bifasciatus in the Red Sea, Egypt},
      journal = {International Journal of Ecotoxicology and Ecobiology},
      volume = {4},
      number = {4},
      pages = {80-87},
      doi = {10.11648/j.ijee.20190404.11},
      url = {https://doi.org/10.11648/j.ijee.20190404.11},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijee.20190404.11},
      abstract = {The present study is the first study on the population dynamics and management of the Acanthopagrus bifasciatus in the Egyptian sector of Red Sea. A total of 729 specimens were monthly collected from the Egyptian Red Sea during January 2015 to December 2015. Results showed that, the longevity of A. bifasciatus is 9 years in the Egyptian Red Sea and age group three was the most frequent one for combined sexes forming up to 26.61% of the total catch. The age group one was absent in the collected samples and the highest growth in length was observed at the end of the second year of life (24.6 cm) after which the annual increment decreases gradually with increase in age. The growth in weight was isometric. The length at first capture was 25.31 cm with corresponding age 2.22 year. The total, natural and fishing mortality were estimated as 1.99, 0.46 and 1.53 yr-1, respectively. The exploitation ratio E was estimated at 0.77 indicating a high level of exploitation. The yield per recruit analysis showed that the present level of fishing mortality is much higher than that gives the maximum yield per recruit by about 48% and the reduction of current level of fishing mortality coefficient from 1.53 to 0.8 / y will be associated with an increase in the yield per recruit from 242.71 to 250.56 g (≈3%).},
     year = {2019}
    }
    

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  • TY  - JOUR
    T1  - Population Dynamics and Management of Two-barred Seabream Acanthopagrus bifasciatus in the Red Sea, Egypt
    AU  - Samia Mohsen El-Mahdy
    AU  - Sahar Fahmy Mehanna
    AU  - Usama Mohammed Mahmoud
    AU  - Fahmy Ibrahim El-Gammal
    Y1  - 2019/10/31
    PY  - 2019
    N1  - https://doi.org/10.11648/j.ijee.20190404.11
    DO  - 10.11648/j.ijee.20190404.11
    T2  - International Journal of Ecotoxicology and Ecobiology
    JF  - International Journal of Ecotoxicology and Ecobiology
    JO  - International Journal of Ecotoxicology and Ecobiology
    SP  - 80
    EP  - 87
    PB  - Science Publishing Group
    SN  - 2575-1735
    UR  - https://doi.org/10.11648/j.ijee.20190404.11
    AB  - The present study is the first study on the population dynamics and management of the Acanthopagrus bifasciatus in the Egyptian sector of Red Sea. A total of 729 specimens were monthly collected from the Egyptian Red Sea during January 2015 to December 2015. Results showed that, the longevity of A. bifasciatus is 9 years in the Egyptian Red Sea and age group three was the most frequent one for combined sexes forming up to 26.61% of the total catch. The age group one was absent in the collected samples and the highest growth in length was observed at the end of the second year of life (24.6 cm) after which the annual increment decreases gradually with increase in age. The growth in weight was isometric. The length at first capture was 25.31 cm with corresponding age 2.22 year. The total, natural and fishing mortality were estimated as 1.99, 0.46 and 1.53 yr-1, respectively. The exploitation ratio E was estimated at 0.77 indicating a high level of exploitation. The yield per recruit analysis showed that the present level of fishing mortality is much higher than that gives the maximum yield per recruit by about 48% and the reduction of current level of fishing mortality coefficient from 1.53 to 0.8 / y will be associated with an increase in the yield per recruit from 242.71 to 250.56 g (≈3%).
    VL  - 4
    IS  - 4
    ER  - 

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Author Information
  • Fish Population Dynamics Lab, Fisheries Division, National Institute of Oceanography and Fisheries, Alexandria, Egypt

  • Fish Population Dynamics Lab, Fisheries Division, National Institute of Oceanography and Fisheries, Alexandria, Egypt

  • Zoology Department, Faculty of Science, Assiut University, Assiut, Egypt

  • Fish Population Dynamics Lab, Fisheries Division, National Institute of Oceanography and Fisheries, Alexandria, Egypt

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