Population Dynamics of Seabreams (Pagrus caeruleostictus, Pagellus bellottii, Dentex angolensis and Dentex congoensis) from the Coast of Ghana, West Africa

Yıl 2023, Cilt: 6 Sayı: 1, 24 - 32, 04.07.2023

Samuel Amponsah , Berchie Asiedu , Nii Commey Amarquaye Emmanuel Ofori-boateng Nana Ama Afranewaa Samuel Henneh

https://doi.org/10.46384/jmsf.1231226

Öz

Stock assessment indicators of Pagrus caeruloestictus, Pagellus bellotti, Dentex angolensis and Dentex congoensis from Ghana’s coastal waters were estimated between July 2018 and June 2019. Total length measurements of 2489 samples were collected from some selected coastal communities along the Greater Accra region of Ghana and analyzed using FISAT II Tool. The asymptotic length (L∞) for P. caeruleostictus, P. bellottii, D. angolensis and D. congoensis was 39.9 cm, 31.5 cm, 31.5 cm and 28.4 cm, respectively. The growth rate (K) was 0.18 yr-1 for P. caeruleostictus, 0.36 yr-1 for P. bellottii, 0.75 yr-1 for D. angolensis and 0.83 yr-1 for D. congoensis. The current exploitation rate (E) for P. caeruloestictus, P. bellotti, D. angolensis and D. congoensis was above the optimum level of 0.5, indicating that these species are facing high fishing pressure. To ensure sustainable management of the overexploited fish species, the need for relevant management measures such extension of the closed fishing season, reduced fishing effort and others are urgently required.

Anahtar Kelimeler

Seabreams, Growth parameters, Mortality parameters, Fisheries menagement

Destekleyen Kurum

None

Proje Numarası

None

Batı Afrika, Gana Kıyılarında Mercan Balıklarının (Pagrus caeruleostictus, Pagellus bellottii, Dentex angolensis ve Dentex congoensis) Popülasyon Dinamikleri

Öz

Gana'nın kıyı sularından Pagrus caeruloestictus, Pagellus bellotti, Dentex angolensis ve Dentex congoensis'in stok değerlendirme göstergeleri Temmuz 2018 ile Haziran 2019 arasında tahmin edilmiştir. Gana'nın Greater Accra bölgesi boyunca seçilmiş bazı kıyı topluluklarından 2489 bireyin uzunluk ölçümleri toplanmış ve FISAT II programı kullanılarak analiz edilmiştir. P. caeruleostictus, P. bellottii, D. angolensis ve D. congoensis için asimptotik uzunluk (L∞) sırasıyla 39.9 cm, 31.5 cm, 31.5 cm ve 28.4 cm idi. Büyüme oranı (K) P. caeruleostictus için 0.18 yıl-1, P. bellottii için 0.36 yıl-1, D. angolensis için 0.75 yıl-1 ve D. congoensis için 0.83 yıl-1 idi. P. caeruloestictus, P. bellotti, D. angolensis ve D. congoensis için mevcut yararlanma oranı (E), bu türlerin yüksek avcılık baskısıyla karşı karşıya olduğunu gösteren optimum seviye olan 0,5'in üzerindeydi. Aşırı avlanan balık türlerinin sürdürülebilir yönetimini sağlamak için, kapalı balıkçılık sezonunun uzatılması, avlanma çabalarının azaltılması ve benzeri yönetim önlemlerine acilen ihtiyaç duyulmaktadır.

Anahtar Kelimeler

Mercan balıkları, Büyüme parametreleri, Ölüm parametreleri, Balıkçılık yönetimi

Proje Numarası

None

Kaynakça

• Amponsah, S. K., Ofori-Danson, P. K., Nunoo, F. K., & Ameyaw, G. A. (2016). Aspects of population dynamics of Red Pandora, Pagellus bellottii (Steindachner, 1882) from the coastal waters of Ghana.
• Asabere-Araeyaw, A., & Blay Jr, J. (1999). Growth and mortality parameters oi Pagellus bellottii (sparidae) in the Cape Coast area of Ghana. Journal of the Ghana Science Association, 1(2), 53-62.
• Anato, C. B. (1999). Les Sparidae des côtes béninoises: Milieu de vie, pêche, présentation des espèces et biologie de Dentex angolensis Poll et Maul, 1953. Thèse de Doctorat d’Etat es Sciences, Faculte des Sciences 1060 Tunis, Tunisie. 277 p.
• Clottey, M. N. K. (2020). Population dynamics and reproductive studies of three commercially important sparid species from Ghanaian waters (Doctoral dissertation, University of Cape Coast).
• Edwards, A. J., Gill, A. C. & Abohweyere, P. O. (2001). A Revision of Irvine’s Marine Fishes. Coastal Resources Center, University of Rhode Island.
• EUMOFA. (2015). The EU Fish Market, 2015 Edition.
• FAO. (2015). Fish Fact Sheet. Retrieved from http://www.fao.org/fishery/species/2384/en.
• Fischer, W. F., Bianchi, G. & Scott, W. B. (1981). FAO Identification sheets for Fishery purposes. Eastern-Central Atlantic; Fishing areas 34, 37 (in part). Canada Funds-in-Trust by arrangement with the FAO. Vol.II. 54 pp.
• Georgiev, Z. M. & Kolarov, P. (1962). On the migration and distribution of horse mackerel (Trachurus ponticus Aleev) in the western p art of Black Sea. Arbeiten des Zentralen Forschungsinstitutes fur Fishzught und Fisherei-Varna, 2: 148-172.
• Khalaf-Allah, H. M., Azab, A. M. & Mohamed, M. A. (2016). Morphological differences of gill rakers in some sparid fish species (Family: Sparidae), Egypt. International Journal of Environmental Science and Engineering,7: 63- 72.
• Konoyima, K. J., & Seisay, L. D. (2021). Growth, Mortality and Exploitation Rate of Pagellus bellottii Harvested from the Marine Territorial Waters of Sierra Leone. Acta Aquatica: Aquatic Sciences Journal, 8(2), 60-65.
• Kouame, A. C., Sylla, S., Yao, S. S., Tia, C. B., & Loukou, G. A. (2020). Stock assessment of red Pandora Pagellus Bellottii (Steindachner, 1882) in the Ivorian continental shelf (West Africa). Agronomie Africaine, 32(4), 423-438.
• Lazar, N. (2017). Baseline assessment of demersal fish stocks of the Western Region of Ghana. The USAID/Ghana Sustainable Fisheries Management Project (SFMP). Narragansett, RI: Coastal Resources Center, Graduate School of Oceanography, University of Rhode Island. GH2014_ACT092_CRC, 55.
• Nelson, J.S. (1994). Fishes of the world. Third edition. John Wiley & Sons, Inc., New York. 600 p.
• Nelson J.S., Grande T.C., & Wilson M.V.H. (2016). Fishes of the World. 5th edition. John Wiley & Sons, Hoboken, N.J. 707 p.
• Nunoo, F. K. E., Asiedu, B., Amador, K., Belhabib, D., & Pauly, D. (2014). Reconstruction of marine fisheries catches for Ghana, 1950–2010. Vancouver (Canada): Fisheries Centre, University of British Columbia.
• Parenti, P. (2019). An annotated checklist of the fishes of the family Sparidae. FishTaxa, 4(2): 47-98.
• Park, J. M., Hashimoto, H., Jeong, J. M., Kim, H. J. & Baeck, G. W. (2013). Age and growth of the robust tonguefish Cynoglossus robustus in the Seto Inland Sea, Japan. Animal Cells and Systems, 17:4, 290-297, DOI:10.1080/19768354.2013.826281.
• Pauly, D. (1979). Theory and Management of Tropical Multi-Species Stocks: A Re-view, with Emphasis on the Southeast Asian Demersal Fisheries. ICLARM Studies and Review No. 1, International Center for Living Aquatic Resources Management, Manila, Philippines, 1-35.
• Pauly, D. & David, W. (1981). ELEFAN 1, BASIC Program for the Objective Ex-traction of Growth Parameters from Length-Frequency Data. Meeresforch, 28, 205-211.
• Pauly, D. & Munro, J. L. (1984). Once More on the Comparison of Growth in Fish and Invertebrates. ICLARM Fishbyte, 2, 21.
• Qamar, N., Panhwar, S.K. & Brower, S. (2016). Population characteristics and biological reference point estimates for two carangid fishes Megalaspiscordyla and Scomberoidestol in the northern Arabian Sea, coast of Pakistan. Pakistan Journal of Zoology, 48: 869-874.
• Sambo, F. and Haruna, M. (2012). Some aspects of the growth parameters of the fishes of Ibrahim Adamu Lake, Kazaure Jigawa state, Nigeria. Bayero Journal of Pure and Applied Sciences, 5(1): 175 – 181.
• Sparre, P. & Venema, S.C. (1992). Introduction to tropical fish stock assessment. Part 1. Manual, FAO Fisheries Technical Paper, 306. No. 1, Review 1, FAO, Rome, 376 p.
• Taylor, M. & Mildenberger, T. K. (2017). Extending electronic length frequency analysis in R. Fisheries Management and Ecology. s24: 330–338.
• Then, A. Y., Hoenig, J. M., Hall, N. G. & Hewitt, D. A. (2015). Evaluating the predictive performance of empirical estimators of natural mortality rate using information on over 200 fish species. ICES Journal of Marine Science, 72 (1): 82-92.
• USAID (2009). Ghana fishery product report. USAID Global Agricultural Information Network report number GH9005.