Growth and exploitation parameters of ladyfish Elops lacerta Valenciennes, 1847 in the Ivorian’s exclusive economic zone, Côte d’Ivoire

Angelina Gbohono Loukou, Soumaïla Sylla, Olivier Assoi Etchian, Ida Akissi Konan, Célestin Boua Atse

Abstract

West African ladyfish, Elops lacerta is a pelagic fish present in the coastal waters of West Africa from Mauritania to Angola. This study is conducted to provide data on the growth and exploitation parameters of E. lacerta important for the management and conservation of this species in the Ivorian’s Exclusive Economic Zone (EEZ). These parameters were estimated by the indirect method using length frequency data collected in the Ivorian’s EEZ during January 2019 to December 2020. Monthly length frequency data were analyzed by FiSAT II software. A total of 865 specimens were examined. The growth parameters from von Bertalanffy growth function (VBGF) estimations were L∞ = 60.38 cm fork length, K = 0.39 year−1, and t0 = 0.46 year. The estimated potential longevity (tmax) was 7.69 years. The exploitation parameters showed that the total mortality rate (Z), natural mortality rate (M) at 28.35°C and fishing mortality rate (F) were 1.57 year−1, 0.80 year−1 and 0.77 year−1, respectively. The exploitation rate (E = F/Z) was 0.49. This value is lower than the optimal exploitation value (E50), thus expressing a case of under-exploitation of the species in the Ivorian’s EEZ. The size of first capture (Lc) below the size of first sexual maturity (FL50) and the optimal size of capture (Lopt) requires the implementation of an adequate mesh size management policy to allow fish to reproduce several times before being captured.

Keywords

Growth parameters, Von Bertalanffy model, Population dynamics, Exploitation rate, West Africa.

Full Text:

PDF

References

Abdul W.O., Omoniyi I.T., Adekoya E O., Adeosun F.I., Odulate O.O., Idowu A.A., Olajide A.E; Olowe O.S. (2016). Length-weight relationship and condition factor of some commercial fish species in ogun state coastal estuary, Nigéria. Ife Journal of Agriculture 28(1): 1-10.

Abdul W.O., Omoniyi I.T., Adekoya E.O., Daniel O.S., Olowe O.S. (2015). Some stock parameters of Elops lacerta during estuarine phase of life history. Ife Journal of Science, 17(2): 323-334.

Adams A.J., Horodysky A.Z., McBride R.S., Guindon K., Shenker J., MacDonald T.C., Harwell H.D., Ward R., Carpenter K. (2013). Global conservation status and research needs for tarpons (Megalopidae), ladyfish (Elopidae) and bonefishes (Albulidae). Fish and Fisheries, 15: 280-311.

Assan N.F., Soro Y., Amande M.J., Diaha N.C., Angui K.J.P., Edoukou. A., N’Da K. (2018). Influence de l’upwelling sur la disponibilité et la fréquence de taille d’Elagatis bipinnulata (Guoy & Gaimard, 1824) débarqué par la pêche artisanale maritime ivoirienne. Journal of Chemical, Biological and Physical Sciences, 8 (4): 467-476.

Baijot E., Moreau J. (1997). Biology and demographic status of the main fish species in the reservoirs of Burkina Faso. In: E. Baijot, J. Moreau, S. Bouda (Eds.). Hydrobiological aspects of fisheries in small reservoirs in the Sahel region. Technical Centre for Agricultural and Rural Cooperation, Commission of the European Communities, Wageningen, Netherlands. pp: 79-109.

Barry J.P., Tegner M.J. (1989). Inferring Demographic Processes from Size Frequency Distributions: Simple Models Indicate Specific Patterns of Growth and Mortality. Fisheries Bulletin, 88(1): 13-19.

Bassou A. (2016). Le golfe de Guinée, zone de contrastes: richesses et vulnérabilités. OCP Policy Center, 11-16.

Beverton R.J.H, Holt S.J. (1964). Tables of yield functions for fishery assessment. FAO Fisheries Technical Paper, Rome. 38: 49 p.

Beverton R.J.H. (1992). Patterns of reproductive strategy parameters in some marine teleost fishes. Journal of Fish Biology, 41: 137-160.

Beverton R.J.H., Holt S.J. (1959). A review of the lifespans and mortality rates of fish in nature and their relation to growth and other physiological characteristics. CIBA Foundation, Colloquia on Ageing. Vol. 5. In: G.E.W. Wolstenholme, M. O’Connor (Eds.). The lifespan of animals. London, Churchill, 5: 142-180.

Beverton R.J.H., Holt S.J. (1966). Manual of Methods for Fish Stock Assessment, Part 2. In: Tables of Yield Functions. Fisheries Biology Technical Paper, 38 (1). Food and Agriculture Organization of the United Nations, Rome, Italy. 7-29 p.

Campana S.E. (2014). Age determination of elasmobranchs, with special reference to Mediterranean species: a technical manual. Studies and Reviews. General Fisheries Commission for the Mediterranean, 94: 38 p.

Coulibaly B., Tah L., Aboua B.D.R., Joanny T.G.T., Koné T., Kouamélan E.P. (2018). Assessment of fishing effort, catch per unit effort and fish production of the tropical coastal lagoon of grand-lahou (Côte-d’ivoire, West Africa). International Journal of Fisheries and Aquatic Studies, 6(1): 206-212.

Dienye H.E., Olopade O.A., Amachree E.T. (2021). Growth Parameters and Exploitation of Endangered Lady Fish (Elops lacerta Valenciennes, 1847) in the Obuama Creek, Rivers State, Nigeria. Journal of Aquatic Biology and Fisheries, 9: 92-98.

Dortel E., Sardenne F., Bousquet N., Rivot E., Million J., Le Croizier G., Chassot E. (2014). An integrated Bayesian modeling approach for the growth of Indian Océan yellosfin tuna. Fisheries Research, 163: 69-84.

Ecoutin J.M., Albaret J.J. (2003). Relation longueur-poids pour 52 espèces de poissons des estuaires et lagunes de l’Afrique de l’Ouest. Cybium, 27(1): 3-9.

Eveson P.J., Million J., Sardenne F., Le Croizier G. (2015). Estimating growth of tropical tunas in the Indian Ocean using tag-recapture data and otolith based age estimates. Fisheries Research, 163: 58-68.

Eyi A.J., Konan K.J., Tano K., N’Da K., Atsé B.C. (2016). Étude préliminaire des communautés ichtyofauniques de la lagune Ono (Côte d’Ivoire). Journal of Applied Biosciences, 104: 9894-9903.

Fontana A. (1969). Etude de la maturité sexuelle des sardinelles Sardinella eba (Val) et Sardinella aurita C. et V. de la région de pointe-noire. Océanographe biologiste, Centre O.R.S.T.O.M. de Pointe-Noire (Congo), VII(2): 101-113.

Gayanilo F.C.J., Sparre P., Pauly D. (1996). FAO-ICLARM stock assessment tools (FiSAT). User’s guide. FAO Computerized Information Series (Fisheries), Rome, FAO. 8: 126 p.

Gayanilo F.C.J., Sparre P., Pauly D. (2002). FAO-ICLARM Stock Assessment Tools (FiSAT). Software version 1.2. 0. FAO, Roma.

Gayanilo F.C.J., Sparre P., Pauly D. (2005). FAO-ICLARM Stock Assessment Tools II (FiSAT II). Revised. User’s guide. FAO Computerized Information Series (Fisheries), Rome, 8: 168 p.

Ghorbel M., Jarboui O., Bradai M.N., Bouain A. (1996). Détermination de la taille de première maturité sexuelle par une fonction logistique chez Limanda limanda, Pagellus erythrinus et Scorpaena porcus, Bulletin INSTM, 3: 24-27.

Gougnon A.R., Kouadio J.M., Kassi J.B., Mobio A.B., Djagoua E.V. (2018). Variabilité saisonnière et interannuelle de la salinité de surface de la mer du golfe ivoirien à l’aide de l’imagerie satellitaire de SMOS-MIRAS de la période 2010-2014. International Journal of Engineering Science Invention, 7(II): 48-54.

Gulland J.A. (1971). The fish resources of the ocean, West by fleet survey. Fishing News (Books) Ltd., for FAO, West by fleet, England. 255 p.

Hamel J.M., Koch D.J., Steffensen D.K., Pegg A.M., Hammen J.J., Rugg L.M. (2014). Using mark-recapture information to validate and assess age and growth of long-lived fish species. Canadian Journal of Fisheries and Aquatic Sciences, 71(4): 559-566.

Heimbrand Y., Limburg E.K., Hüssy K., Casini M., Sjöberg R., Bratt P.A.M., Levinsky S.E., Karpushevskaia A., Radtke K., Öhlund J. (2020). Seeking the true time: Exploring otolith chemistry as an age determination tool. Journal of Fish Biology, 97: 552-565.

Hie-Daré J.P. (1982). Croissance de la phase lagunaire de Elops lacerta. Documents Scientifiques, Centre de Recherches Océanologiques, Abidjan (Côte d’Ivoire), 13(1): 53-72.

Ikomi R.B. (1994). Observations on the distribution, growth pattern, and dietaries of the ten-pounder Elops lacerta (Val.) in Lekki Lagoon, Nigeria. Discovery and Innovation 6(2): 178-183.

Izzo K.L., Parrish L.D., Zydlewski B.G., Koenigs R. (2021). Second fin ray shows promise for estimating ages of juvenile but not adult lake Sturgeon. Nortfh American Journal of Fisheries Management, 41(1): 217-228.

Konan K.F., Ouattara A., Ouattara M., Gourène G. (2007). Weight-length relationship of 57 species of the Coastal rivers in South-Eastern of Ivory Coast. Ribarstvo, 65(2): 49-60.

Kumbar S.M., Lad S.B. (2016). Estimation of age and longevity of freshwater fish Salmophasia balookee from otoliths, scales and vertebrae. Journal of Environmental Biology, 37(5): 943-947.

Lawson E.O., Aguda A.F. (2010). Growth patterns, diet composition and reproduction in the ten pounder, Elops lacerta from Ologe lagoon, Lagos, Nigeria. Agriculture and Biology Journal of North America, 1(5): 974-984.

Moreau J., Cuende F.X. (1991). On improving the resolution of the recruitment patterns of fishes. Fishbyte, 9(1): 45-46.

N’Dour N., Sambou B., Diadhiou H., Sambou H., Dasylva M. (2017). Atouts et contraintes de la pisciculture traditionnelle de Bandial (Casamance, Sénégal). International Journal of Biological and Chemical Sciences, 11(4): 1685-1705.

Niyonkuru C., Lalèyè A.P., Villanueva C.M., Moreau J. (2007). Population parameters of main fish species of lake Nokoué, Bénin (West Africa). Journal of Afrotropical Zoology, 3(Numéro spécial): 149-155.

Panfili J., De Pontual A., Troadec H., Wright P.J. (2002). Manuel de Sclérochronomogie des Poissons. IFREMER/IRD. 464 p.

Pauly D. (1979). Theory and management of tropical multispecies stocks: a review with emphasis on the Southeast Asian demersal fisheries. ICLARM Studies and Reviews, 1: 35.

Pauly D. (1980a). A selection of simple methods for the assessment of tropical fish stocks. FAO Fisheries Circular, 729: 54.

Pauly D. (1980b). On the interrelationships between natural mortality, growth parameters and mean environmental temperature in 175 fish stocks. Journal du Conseil International pour l’Exploration de la Mer, 39(2): 175- 192.

Pauly D. (1984). Fish population dynamics in tropical waters: a manual for use with programmable calculators. ICLARM ICLARM Contribution, Makati, Metro, Manila, Philippines. 143. 325 p.

Pauly D. (1991). Growth performance in fishes: Rigorous description of patterns as a basis for understanding causal mechanisms. ICLARM Aquabyte, 4(3): 3-6.

Pauly D., Munro J.L. (1984). Once more on the comparison of growth in fish and invertebrates. ICLARM fishbyte, The WorldFish Center, 2(1): 1-21.

Pauly D., Soriano M.L. (1986). Some practical extensions to Beverton and Holt’s relative yield-per recruit model. In: J.L. Maclean, L.B. Dixin, L.V. Hosillo (Eds.), First Asian Fisheries Forum. Asian Fisheries Society, Manila, Philippines. pp: 491-496.

Scherrer B. (1984). Biostatistique. Gäetan Morin. 850 p.

UICN. (2019). Elops lacerta. The IUCN Red List of Threatened Species. Available from: https://www. iucnredlist.org/fr/species/182549/135034555. Retrieved 26/05/2021.

Von Bertalanffy L. (1938). A quantitative theory of organic growth (inquiries on growth laws II). Human Biology, 10(2): 181-213.

Wagué A., Papaconstantinou C. (1997). Age, croissance et mortalité du serran hepate, Serranus hepatus (Linné, 1758) (poisson, Serranidae) dans le golfe de Thermaikos (mer Egée, Grèce). Marine Life, 7 (1-2): 39-46.

Refbacks

  • There are currently no refbacks.