[ Relation poids-longueur et facteur de condition de Trematocara unimaculatum Boulenger 1901 et Oreochromis niloticus (Linnaeus, 1758), deux espèces de poissons - cichlidés de la zone littorale du Nord du Lac Tanganyika: Cas des stations Kumase et Estuaire de la Rusizi de la côte burundaise ]
Volume 40, Issue 4, October 2023, Pages 1214–1222
Mbonimpa Gordien1, Niyonkuru Charles2, and Nibona Emile3
1 Centre de Recherche en Sciences Naturelles et Environnement, Faculté des Sciences, Université du . BP: 2700 Bujumbura, Burun, Burundi
2 Professeur, Institut de Pédagogie appliquée de l’Université de , Bujumbura, Burun, Burundi
3 Centre Universitaire de Recherche et de Pédagogie Appliqués aux Sciences, laboratoire de Nutrition-Phytochimie, Environnement et Ecologie Appliqués aux Sciences, Institut de Pédagogie Appliqué, Université du , BP: 5223 Bujumbura, Burun, Burundi
Original language: French
Copyright © 2023 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.
Parameters of the weight-length relationship and the condition factor are very important in the knowledge of several aspects of biology and in the management of fisheries. Unfortunately, there are few studies relating to the ichthyofauna of Lake Tanganyika in general and cichlids in particular. This study was conducted with the aim of contributing to enrich the existing database and the rational management of the lake. Total lengths and weights were obtained based on T. unimaculatum and O. niloticus fish samples collected over 8 months (January to August 2021). The correlations between the length and the weight of the specimens are very strong with coefficients of determination ranging from 0.95 to 0.99. In both stations, positive allometry was recorded in T. unimaculatum (b>3) while isometric growth was recorded in O. niloticus. Mean K is greater than 1 in O. niloticus while mean K <1 in T. unimaculatum. In the latter species, the average K varies significantly depending on the sites (p<0.5) whereas the variation in the average K is not significant in the two sites in O. niloiticus (p>0.). This shows that the two species of cichlid fish adapt differently to the two stations with different environmental characteristics: O. niloticus seems indifferent to the degree of pollution while T. unimaculatum displays an average K in a station known to be less polluted compared to the ‘other.
Author Keywords: Cichlid -fishes, Lake Tanganyika, biological parameters, fisheries management.
Volume 40, Issue 4, October 2023, Pages 1214–1222
Mbonimpa Gordien1, Niyonkuru Charles2, and Nibona Emile3
1 Centre de Recherche en Sciences Naturelles et Environnement, Faculté des Sciences, Université du . BP: 2700 Bujumbura, Burun, Burundi
2 Professeur, Institut de Pédagogie appliquée de l’Université de , Bujumbura, Burun, Burundi
3 Centre Universitaire de Recherche et de Pédagogie Appliqués aux Sciences, laboratoire de Nutrition-Phytochimie, Environnement et Ecologie Appliqués aux Sciences, Institut de Pédagogie Appliqué, Université du , BP: 5223 Bujumbura, Burun, Burundi
Original language: French
Copyright © 2023 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
Parameters of the weight-length relationship and the condition factor are very important in the knowledge of several aspects of biology and in the management of fisheries. Unfortunately, there are few studies relating to the ichthyofauna of Lake Tanganyika in general and cichlids in particular. This study was conducted with the aim of contributing to enrich the existing database and the rational management of the lake. Total lengths and weights were obtained based on T. unimaculatum and O. niloticus fish samples collected over 8 months (January to August 2021). The correlations between the length and the weight of the specimens are very strong with coefficients of determination ranging from 0.95 to 0.99. In both stations, positive allometry was recorded in T. unimaculatum (b>3) while isometric growth was recorded in O. niloticus. Mean K is greater than 1 in O. niloticus while mean K <1 in T. unimaculatum. In the latter species, the average K varies significantly depending on the sites (p<0.5) whereas the variation in the average K is not significant in the two sites in O. niloiticus (p>0.). This shows that the two species of cichlid fish adapt differently to the two stations with different environmental characteristics: O. niloticus seems indifferent to the degree of pollution while T. unimaculatum displays an average K in a station known to be less polluted compared to the ‘other.
Author Keywords: Cichlid -fishes, Lake Tanganyika, biological parameters, fisheries management.
Abstract: (french)
Les paramètres de la relation poids-longueur et le facteur de condition sont très importants dans la connaissance de plusieurs aspects de la biologie et dans la gestion des pêcheries. Malheureusement les études s’y rapportant sont peu nombreuses pour l’ichtyofaune du Lac Tanganyika en général et des cichlidés en particulier. La présente étude a été menée dans le but de contribuer à enrichir la base de données existantes et la gestion rationnelle du lac. Les longueurs et poids totaux ont été obtenus sur base des échantillons de poissons de T. unimaculatum et O. niloticus collectés pendant 8 mois (de janvier à août 2021). Les corrélations entre la longueur et le poids des spécimens sont très fortes avec des coefficients de détermination qui vont de 0,95 à 0,99. Dans les deux stations, une allométrie positive a été enregistrée chez T. unimaculatum (b>3) alors qu’une croissance isométrique l’a été chez O. niloticus. K moyen est supérieur à 1 chez O. niloticus alors que K moyen <1 chez T. unimaculatum. Chez cette dernière espèce, K moyen varie significativement suivant les sites (p<0,5) alors que la variation du K moyen n’est pas significative dans les deux sites chez O. niloiticus (p>0,). Cela montre que les deux espèces de poissons-cichlidés s’adaptent différemment aux deux stations aux caractéristiques environnementales différentes: O. niloticus semblant indifférente au degré de pollution alors que T. unimaculatum affichant un K moyen dans une station réputée moins polluée par rapport à l’autre.
Author Keywords: Poissons-cichlidés, lac Tanganyika, paramètres biologiques, gestion de la pêche.
How to Cite this Article
Mbonimpa Gordien, Niyonkuru Charles, and Nibona Emile, “Weight-length relationship and condition factor of Trematocara unimaculatum Boulenger 1901 and Oreochromis niloticus (Linnaeus, 1758), two cichlid fish species from the northern littoral zone of Lake Tanganyika: Case of the Kumase and Rusizi Estuary stations on the coast Burundian,” International Journal of Innovation and Applied Studies, vol. 40, no. 4, pp. 1214–1222, October 2023.
