Ecological comparative approach of Sarotherodon melanotheron populations of lowlands dradged and costal lagoon at Togbin in Benin: Weight-Length relationship and condition factor
Paper Details
Ecological comparative approach of Sarotherodon melanotheron populations of lowlands dradged and costal lagoon at Togbin in Benin: Weight-Length relationship and condition factor
Abstract
Lowland dredging has been booming in Benin since 2008 following the ban on the exploitation of marine sand due to coastal erosion. Dredging the hydrobiological influence of aquatic ecosystems and it is essential to understand its impact on the ecology of the fish fauna for future policies of development and protection of fisheries. It is in this logic that the present study aims to evaluate, through a comparative approach, the weight-length relationship and the condition factor of the S. melanotheron population of the dredged bottomlands and the costal lagoon at Togbin. In this study, 428 specimens (230 for the lagoon and 198 for the shallows) were collected from June to September 2017 on which the total weight and total length were taken followed by monthly measurements of the physicochemical parameters of the water. We obtained that the weight-length relationship is significant (p <0.05, R2> 0.70) and revealed a growth isometry at the two water bodies with the coefficient b which varies between 2.0061 and 2.842 (b = 3; <0.05) respectively for dredged bottomlands and all-sex lagoon. The condition factor K obtained for the dredged bottomlands (K= 33.88 ± 12.11) is significantly higher than that of the lagoon (K = 3.04 ± 1.07) (p=0.000). In short, lowland dredging does not damage the ecology of Sarotherodon melanotheron. However, control measures for dredging activities are necessary to avoid the destruction of fish habitat.
Achoh ME. 2017. Reproduction comparée de la population de Sarotherodon melanotheron (Rüppell, 1852) des bas-fondsdraguéset de la lagunecôtière à Togbin au Sud-Bénin. Mémoire de Master Régional en Monitoring des Ressources Aquatiqueset Aménagements des Pêches Continentales. Faculté des Sciences Agronoimiques, Universitéd’ Abomey-Calavi, Bénin, 54 p.
Adité A, Toko I, Gbankoto A. 2013. Fish Assemblages in the Degraded Mangrove Ecosystems of the Coastal Zone, Benin, West Africa: Implications for Ecosystem Restoration and Resources Conservation. Journal of Environmental Protection4, 1461-1475.
Adite A, Abou Y, Sossoukpe E, Fiogbe ED. 2016. The Oyster Farming in the Coastal Ecosystem of Southern Benin (West Africa): Environment, Growth and Contribution to Sustainable Coastal Fisheries Management. International Journal of Development Research 3(10), 087-094
Ahouansou-Montcho S, Laleye P, Linsenmair KE. 2009. Length-length, length–weight relationships and condition factor of Nile perch, Lates niloticus (Linnaeus, 1762) in the Pendjari River, West Africa. International Journal of Biological and Chemical Science 3(3), 466-474. Available online at http://www.ajol.info
Akotossode CC. 2016. Etatactuel des ressources naturelles de Djègbadjiet de Adounko (site Ramsar 1017) au sud-ouest Benin dans le contexteactuel de changement climatique. Mémoire de Licence Professionnelle. Ecole Polytechniqued’ Abomey-Calavi, Universitéd’ Abomey-Calavi, Bénin,59 P.
Amoussou TO, Toguyeni A, ImorouToko I, Chikou A, Issaka YAK. 2016. Caractéristiques biologiques et zootechniques des tilapias africains Oreochromis niloticus(Linnaeus, 1758) et Sarotherodon melanotheron Rüppell, 1852 :une revue. International Journal of Biological and Chemical Sciences 10(4), 1869-1887. http://dx.doi.org/10.4314/ijbcs.v10i4.35
ASECNA. (Agencepour la Sécurité de la Navigation Aérienne en Afrique et à Madagascar). 2014. Nouvelles données météorologiques /Aérodrome /Cotonou/ Bénin, 1 p.
Demir H, Otay EN, Work PA, Borekci OS. 2004. Impacts of dredging on shoreline change. Journal of Waterway, Port, Coastal, and Ocean Engineering 130(4),170–178.
Écoutin JM, Albaret JJ. 2003. Relation longueur-poids pour 52 espèces de poissons des estuaires et lagunes de l’Afrique de l’Ouest. Cybium 27(1), 3-9. https://www.researchgate.net/publication/228826548
Grégoire P. 2004.Modèleconceptueld’aide à la décision multicritère pour le choixnégocie d’un scenario de dragage maritime. Thèse de doctorat de l’universitéd’Artois,299 p.
Hakkou M, Benmohammadi A, Castelle B, Bertin X, Labraimi M, El-Hassani A, Layachi M. 2015. Perspectives d’optimisation technique de la gouvernance environnementale des activités du dragage du sable marin au Maroc. Bulletin de l’Institut Scientifique, Rabat, Section Sciences de la Terre N°37.
Lédéroun D. 2015.Ichtyofaune du Bassin du fleuve Mono (Béninet Togo): Diversité, Écologie et Impacts Anthropiques. Thèse de doctorat, Université de Liège, Belgique, 396 p.
Newell RC, Seiderer JL, Hitchcock DR. 1998. The impact of dredging works in coastal waters: a review of sensitivity to disturbance and subsequent recovery of biological resources on the seabed. Revue annuelled’ Océanographie et de biologie marine36, 127–78.
Niyonkuru C, Laleye P. 2012. A Comparative Ecological Approach of the Length–Weight Relationships and Condition Factor of Sarotherodon Melanotheron Rüppell, 1852 and Tilapia Guineensis (Bleeker 1862) in Lakes Nokoué and Ahémé (Bénin, West Africa). International Journal of Business, Humanities and Technology 2(3), 41-50. http://www.ijbhtnet.com
Omoo OT, Komolafe OO. 2016. Length – weight relationships and conditions factor of several Nigerian fish species. Natulae Scientia Biologicae 8 (1), 21-26. http://dx.doi.org/10.15835/nsb819.780
PSRSA, 2011. Plan stratégique de relance du secteuragricole. Ministère de l’agriculture, de l’élevageet de la pêche (Revue), Bénin. 116 p.
Soletchnik P, Razet D, kairori P, Fairry N, Goullctquer P. 1997. Écophysiologie de la maturation sexuelleet de la ponte de l’huîtrecreuse Crassostrea gigas: réponses métaboliques (respiration) imentaires (filtration, absorption) en fonction des différents stades de maturation. Aquatic Living Resources 10, 177-185. http://dx.doi.org/10.1051/alr:1997019
M. E. Achoh, L. Gangbé, H. Agadjihouèdé, C. C. Akotossode, P. Lalèyè, 2018. Ecological comparative approach of Sarotherodon melanotheron populations of lowlands dradged and costal lagoon at Togbin in Benin: Weight-Length relationship and condition factor. J. Biodiv. Environ. Sci., 12(6), 43-50.
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