[ Différenciation morphologique entre deux souches naturelles et une souche cultivée du tilapia du Nil Oreochromis niloticus (Linnaeus, 1758) au Sud-Kivu, RD Congo ]
Volume 27, Issue 1, August 2019, Pages 323–336
John NIHOREYE FAKAGE1, Pascal Mulungula MASILYA2, Mwapu Pascal ISUMBISHO3, and Freddy OKITAYELA ONAWOMA4
1 Département de Biologie, Institut Supérieur Pédagogique de Bukavu, B.P. 854 Bukavu, RD Congo
2 Département de Biologie, Unité d'Enseignement et de Recherche en Hydrobiologie Appliquée (UERHA), ISP Bukavu, B.P. 854 Bukavu, RD Congo
3 Section des Sciences Exactes, Institut Supérieur Pédagogique (I.S.P.) Bukavu, Bukavu, Sud Kivu, RD Congo
4 Département de Zootechnie, Faculté des Sciences Agronomiques, Université de Kinshasa. B.P. 117 Kinshasa XI, RD Congo
Original language: French
Copyright © 2019 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Morphological variation between two wild populations of Nile tilapia Oreochromis niloticus from Lake Kivu and Ruzizi River respectively and a breeding strain (Nyakabera strain) of the same species was studied by a multivariate analysis of 21 morphometric characters and 4 meristic characters. Principal component analysis and cluster analysis of morphometric characters showed divergence between populations/strains while the same approach with meristic traits didn’t show discrimination between them. These results show that based on the morphometric traits, the two populations of Lake Kivu and Ruzizi River are close to each other and stand out from the Nyakabera strain. The morphological differences thus noted could be due to environmental factors or genetic differences or both combined, in relation to the geography and the life history of these O. niloticus populations considered.
Author Keywords: Intraspecific variation, Lake Kivu, fish farming, morphometrics, multivariate analysis.
Volume 27, Issue 1, August 2019, Pages 323–336
John NIHOREYE FAKAGE1, Pascal Mulungula MASILYA2, Mwapu Pascal ISUMBISHO3, and Freddy OKITAYELA ONAWOMA4
1 Département de Biologie, Institut Supérieur Pédagogique de Bukavu, B.P. 854 Bukavu, RD Congo
2 Département de Biologie, Unité d'Enseignement et de Recherche en Hydrobiologie Appliquée (UERHA), ISP Bukavu, B.P. 854 Bukavu, RD Congo
3 Section des Sciences Exactes, Institut Supérieur Pédagogique (I.S.P.) Bukavu, Bukavu, Sud Kivu, RD Congo
4 Département de Zootechnie, Faculté des Sciences Agronomiques, Université de Kinshasa. B.P. 117 Kinshasa XI, RD Congo
Original language: French
Copyright © 2019 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Morphological variation between two wild populations of Nile tilapia Oreochromis niloticus from Lake Kivu and Ruzizi River respectively and a breeding strain (Nyakabera strain) of the same species was studied by a multivariate analysis of 21 morphometric characters and 4 meristic characters. Principal component analysis and cluster analysis of morphometric characters showed divergence between populations/strains while the same approach with meristic traits didn’t show discrimination between them. These results show that based on the morphometric traits, the two populations of Lake Kivu and Ruzizi River are close to each other and stand out from the Nyakabera strain. The morphological differences thus noted could be due to environmental factors or genetic differences or both combined, in relation to the geography and the life history of these O. niloticus populations considered.
Author Keywords: Intraspecific variation, Lake Kivu, fish farming, morphometrics, multivariate analysis.
Abstract: (french)
La variation morphologique entre deux populations sauvages du tilapia du Nil Oreochromis niloticus provenant respectivement du lac Kivu et de la rivière Ruzizi et une souche d’élevage (souche Nyakabera) de la même espèce a été étudiée par une analyse multivariée de 21 caractères morphométriques et 4 caractères méristiques. L’analyse en composantes principales et la classification hiérarchique des caractères morphométriques ont montré une divergence entre les populations/souches pendant que la même approche avec les caractères méristiques n’a pas permis une discrimination entre celles-ci. Ces résultats montrent qu’en se basant sur les traits morphométriques, les deux populations du lac Kivu et de la rivière Ruzizi sont proches et se démarquent de la souche Nyakabera. Les différences morphologiques ainsi constatées pourraient être dues à des facteurs environnementaux ou à des différences génétiques ou les deux combinés, en relation avec la géographie et l’histoire de vie ces populations d’O. niloticus considérées.
Author Keywords: Variation intraspécifique, Lac Kivu, pisciculture, morphométrie, analyse multivariée.
How to Cite this Article
John NIHOREYE FAKAGE, Pascal Mulungula MASILYA, Mwapu Pascal ISUMBISHO, and Freddy OKITAYELA ONAWOMA, “Morphological differentiation between two wild and one cultured strains of Nile tilapia Oreochromis niloticus (Linnaeus, 1758) in South-Kivu, DR Congo,” International Journal of Innovation and Applied Studies, vol. 27, no. 1, pp. 323–336, August 2019.
