IDEAS home Printed from https://ideas.repec.org/a/epw/ejgeo0/v2y2021i1id16108.html

Growth, Mortality and Exploitation Levels of Sphyraena sphyraena (Pisces: Sphyraenidae) and Apsilus fuscus (Pisces: Lutjanidae) in Ghanaian Waters

Author

Listed:
  • Joseph Aggrey-Fynn
  • Divine Worlanyo Hotor

Abstract

Sphyraena sphyraena (Linnaeus, 1758) and Apsilus fuscus (Valenciennes, 1830) are commercially important fish species in Ghana. The stocks are exploited mainly by the artisanal and semi-industrial fisheries. Growth and mortality rates, and exploitation levels of the two stocks in inshore waters of Ghana were assessed as a contribution to fill the knowledge gap on the species. Samples were obtained from three landing sites along the coast of Ghana from February to July, 2017. Length-frequency data were used to estimate growth, mortality and exploitation ratios. The modal class for S. sphyraena was 37.0–39.9 cm total length (TL) and 34.0–35.9 cm TL for A. fuscus. The length and weight relationships established that growth in S. sphyraena was negative allometric, whereas that of A. fuscus was isometric. The estimated growth parameters from the length frequency data fitted with the von Bertalanffy growth function were asymptotic length (L∞) of 69.9 cm TL for S. sphyraena and 53.5 cm TL for A. fuscus. The growth constant (K) was calculated as 1.64 yr-1 for S. sphyraena and 0.50 yr-1 for A. fuscus. The mean length-at-first capture (Lc) was found to be lower than the mean length at sexual maturity (Lm) for both species. The sex ratio showed a dominance of females over males in S. sphyraena, and 1:1 for A. fuscus. The total mortality rate (Z) for S. sphyraena was more than for A. fuscus. The estimated natural mortality (M) was 1.88 yr-1 for S. sphyraena and 0.74 yr-1 for A. fuscus whilst fishing mortality (F) rate was 3.04 yr-1 for S. sphyraena and 0.93 yr-1 for A. fuscus. The exploitation ratio showed that both fish stocks were exploited over the optimum levels. The estimated population parameters of the species obtained from the study, therefore, might be useful for the sustainable management of the stocks.

Suggested Citation

  • Joseph Aggrey-Fynn & Divine Worlanyo Hotor, 2021. "Growth, Mortality and Exploitation Levels of Sphyraena sphyraena (Pisces: Sphyraenidae) and Apsilus fuscus (Pisces: Lutjanidae) in Ghanaian Waters," European Journal of Environment and Earth Sciences, European Open Science, vol. 2(1), pages 16-23, January.
    • Handle: RePEc:epw:ejgeo0:v:2:y:2021:i:1:id:16108
    DOI: 10.24018/ejgeo.2021.2.1.108
    as

    Download full text from publisher

    File URL: https://eu-opensci.org/index.php/ejgeo/article/view/16108
    File Function: Abstract page
    Download Restriction: no
    File URL: https://eu-opensci.org/index.php/ejgeo/article/download/16108/3796
    File Function: Full text
    Download Restriction: no
    File URL: https://libkey.io/10.24018/ejgeo.2021.2.1.108?utm_source=ideas
    LibKey link: if access is restricted and if your library uses this service, LibKey will redirect you to where you can use your library subscription to access this item
    ---><---

    References listed on IDEAS

    as
    1. Pauly, D. & Munro, J.L., 1984. "Once more on the comparison of growth in fish and invertebrates," Fishbyte, The WorldFish Center, vol. 2(1), pages 1-21.
    Full references (including those not matched with items on IDEAS)

    Most related items

    These are the items that most often cite the same works as this one and are cited by the same works as this one.
    1. Copland, John W. & Lucas, J.S., 1988. "Giant Clams in Asia and the Pacific," Monographs, Australian Centre for International Agricultural Research, number 118042.
    2. Josepha Duarte Pinto Gomes & Bocar Sabaly Baldé & Saliou Faye & Iça Barry & Hervé Demarcq & Patrice Brehmer, 2024. "Growth Patterns of Small Pelagic Fish in West Africa," Sustainability, MDPI, vol. 16(22), pages 1-17, November.
    3. Sahar Fahmy Mehanna, 2022. "Life-history Parameters of Shield-Head Catfish Synodontis Schall (Bloch and Schneider, 1801) in the Nile River, Egypt," Journal of Agriculture and Crops, Academic Research Publishing Group, vol. 8(2), pages 87-93, 04-2022.
    4. Ingles, J. & Pauly, D., 1984. "An atlas of the growth, mortality and recruitment of Philippine fishes," Monographs, The WorldFish Center, number 12326, April.
    5. Samuel K. K. Amponsah & Berchie Asiedu & Selasi Yao Avornyo & Seyramsarah Blossom Setufe & Pierre Failler, 2021. "Growth, Mortality and Exploitation Rates of African Moonfish (Selene dorsalis, Gill 1863) Encountered in the Coast of Ghana (West Africa)," European Journal of Biology and Biotechnology, European Open Science, vol. 2(2), pages 6-10, March.
    6. Waidi Oyebanjo Abdul & Isaac Tunde Omoniyi & Yemi Akegbejo-Samsons & Adeolu A. Akinyemi & Adrew O. Agbon & Festus Idowu Adeosun, 2012. "Management Indicators and Growth Performance Index of Tilapia zillii in a Tropical Coastal Estuary," Journal of Agricultural Science, Canadian Center of Science and Education, vol. 4(11), pages 1-66, October.
    7. Isaac, V.J., 1990. "The accuracy of some length-based methods for fish population studies," Monographs, The WorldFish Center, number 5259, April.
    8. Ferdous Ahamed & Mohaiminul Haque Rakib & Dipto Roy & Hamida Akter & Zoarder Faruque Ahmed, 2023. "Estimation of Population Parameters of Glossogobius giuris in the Rabnabad Channel, Southern Bangladesh: Implications for Sustainable Management," Sustainability, MDPI, vol. 15(13), pages 1-15, June.

    More about this item

    Keywords

    ;
    ;
    ;
    ;

    Statistics

    Access and download statistics

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:epw:ejgeo0:v:2:y:2021:i:1:id:16108. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a bibliographic reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Support Team (email available below). General contact details of provider: https://eu-opensci.org/index.php/ejgeo .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.