Diversity, Relative Abundance and Some Biological Aspects of Fishes in Geba and Sor Rivers, Baro-Akobo Basin, Southwest Ethiopia
Contenu principal de l'article
Résumé
Diversity, relative abundance and some biological aspects of fishes in Geba and Sor Rivers were studied using gill nets (6, 8, 10 and 12cm stretched mesh sizes) and hooks. Samples of fish were collected in wet (October to November 2012) and dry (February to March 2013) seasons. A total of 348 fish specimens were collected from both rivers at both seasons. Nine fish species were identified which were included in six genera and four families. The represented families include Mormyridae, Cyprinidae, Bagridae and Cichlidae. The family Cyprinidae was the most dominant with respect to number of species consisting of six species (66.7%). The diversity of fish species in Geba River (H’=1.50) was higher than that of Sor River (H’ =1.10). The fish diversity of Geba and Sor Rivers is less compared to most studied Ethiopian rivers. Labeobarbus intermedius (60.72%IRI), Labeobarbus nedgia (16.83%IRI) and Labeo cylindricus (14.66%IRI) were the most abundant fish species. The abundance of fish specimens in dry season was higher than in wet season. The length-weight relationships for these species were found to be curvilinear. The mean FCF for Labeobarbus intermedius, Labeobarbus nedgia and Labeo cylindricus were 1.21, 1.02 and 1.21 in Geba and Sor Rivers, respectively. There was significant variation (ANOVA, P<0.05) in FCF of Labeo cylindricus in the two seasons. However, variations were insignificant (ANOVA, P > 0.05) for the Labeobarbus intermedius and Labeobarbus nedgia in wet and dry seasons. In both rivers females were more numerous than males and statistically significant (Chi-square, P<0.05). Further investigation on the fish diversity especially on the tributaries of these rivers and socio-economic aspects of the two rivers is recommended.
Details de l'article
Ce travail est disponible sous licence Creative Commons Attribution - Pas d’Utilisation Commerciale - Partage dans les Mêmes Conditions 4.0 International.
Comment citer
##plugins.generic.shariff.share##
Références
Abebe Getahun (2002). The Nile basin: riverine fish and fisheries. Dept. of Biology, Addis Ababa University, Addis Ababa, Ethiopia, pp. 19.
Abebe Getahun (2003). The Nile in the Ethiopian Territory: Riverine fish and fisheries. A paper presented at the Food and Water challenge international workshop that took place in Addis Ababa, Ethiopia.
Abebe Getahun (2007). An overview of diversity and conservation status of the Ethiopian freshwater fish fauna. J. Afrotrop. Zool. (special issue): 87-96.
Abebe Getahun and Stiassny, M. (1998). The freshwater biodiversity crisis: the case of the Ethiopian fish fauna. SINET: Ethiop. J. Sci. 21 (2): 207-230.
Asefa Tessema, Minwyelet Mingist, and Eshete Dejen (2012). Diversity, Relative Abundance, and Biology of Fishes in Borkena and Mille Rivers, Awash Basin, Ethiopia. J. Fish. Int. 7(3):70-76.
Bagenal, T. and Tesch, F. (1978). Age and growth. In: Bageal, T.B. (Ed). Methods for Assessment of fish production in fresh waters. Black well, Oxford, New York, pp 101-136.
Begon, M., Harper, J. and Townsend, C. (1990). Ecology: Individuals, populations and communities. 2nd ed. Blackwell Scientific Publications, p 945.
Boulenger, G. (1905). The distribution of African freshwater fishes. Nature 72: 413-421.
Boulenger, G. (1909-1916). Catalogue of the freshwater fishes of Africa. Volumes 1-4. British Museum of Natural History, London.
Demeke Admassu. 1994. Maturity, fecundity, brood size, and sex ratio of Tilapia (Oreochromis niloticus) in Lake Hawassa, Ethiopia. SINET: Ethiopia J. Sci. 17: 1: 53-69.
Dereje Twabe (2008). Diversity, relative abundance, and Biology of fishes in Gendwuha, Guang, Shinfa, and Ayima Rivers, North Gonder Ethiopia. M.Sc Thesis, Addis Ababa University, Ethiopia.
Ferreira, S., Sousa R., Delgado J., Carvalho D. and Chada T. (2008). Weight-length relationships for demersal fish species caught off the Madeira archipelago (eastern-central Atlantic). J. Appl. Ichthyol. 24: 93-95.
Genanaw Tesfaye (2006). Diversity, relative abundance, and biology of fishes in Angereb and Sanja Rivers, Tekeze basin, Ethiopia. MSc. Thesis. Addis Ababa University, Ethiopia. 90 pp.
Getachew Teferra (1987). Food, nutrition and digestive efficiency in Oreochromis niloticus L. (Pisces: Cichlidae) in Lake Awassa, Ethiopia.Unpubl. Ph.D. Dissertation, University of Waterloo, Canada, 109p.
Golubstov A. and Mina, M. (2003). Fish species Diversity in the main drainage system of Ethiopia: Current state of knowledge and research perspectives Ethiopia. J. Nat Res. 5: 281-318.
Golubstov, A. and Darkov, A. (2008). A review of Fish Diversity in the main Drainage systems of Ethiopia. In: Ecological and Faunistic studies in Ethiopia. Dmitry, S., Pavlov, Dgebuadge, Y., Andrey, A.Mina, M.,(eds). JERBE 20 Years Scientific Cooperation, Artistic inc. Addis Ababa, Ethiopia, p173.
Golubtsov, A., Darkov, A., Dgebuadze, Yu.Yu., Mina, M.(1995). An artificial key to fish species of the Gambela region (The White Nile basin in the limits of Ethiopia). Joint Ethio-Russian Biological Expedition. Artistic Printing Enterprise, Addis Ababa, Ethiopia, pp. 84.
Kolding, J. (1999). PASGEAR. A data base package for experimental or artisanal fishery data from passive gears. An introductory manual. University of Bergen, Dept. of Fisheries and Marine Biology.
Lecren, G. (1951). The length-weight relationship and seasonal cycle in gonad weight and condition in the perch (Perca fluviatilis). J. Anim. Ecol. 20: 20-219. National Metrological Agency Jimma Branch (2013). National Metrological Agency Jimma Branch, Jimma.
Nowak, M., Popek, W., Jagusiak, W. Deptu, S., Popek, J., Tatoj, K., Krzysztof, K., and Epler, P. (2009). Weight-length relationships for three fishes (Leuciscus leuciscus, Phoxinus phoxinus, Salmo trutta) from the Strwiaz River (Dniester River drainage). Arch. Pol. Fish. 17: 313-316.
Paukert, C. and Coot, R. (2004). Factors affecting condition of Flanmelmout Suckers in Colorado River, Grand Canyon, Arizona. North American Journal of Fish Management 24: 648–653.
Payne, A. (1986). Ecology of tropical lakes and rivers. John Ailey and Sons, Cheheester, 301 pp.
Redeat Habteselassie (2012). Fishes of Ethiopia. Annotated Checklist With Pictorial Identification Guide. Ethiopian Fisheries and Aquatic Science Association, Addis Ababa.
Shibru Tedla (1973). Freshwater fishes of Ethiopia. Department of Biology, Addis Ababa University, Addis Ababa, Ethiopia, p 101.
Stiassny, M. and Abebe Getahun (2007). An overview of labeoin relationship and the phylogenetic placement of the Afro-Asian genus Garra Hamilton, 1922 (Teleostei: Cyprinidae), with the description of five new species of Garra from Ethiopia, and a key to all African species.
Vaslet, A., Bouchon-Navaro, Y. and Louis M., Bouchon C. (2008). Weight-length relationships for 20 fish species collected Weight-length relationships for three fishes (Leuciscus leuciscus, Phoxinus phoxinus, Salmo trutta). 315 in the mangroves of Guadeloupe (Lesser Antiles). J. Appl. Ichthyol. 24: 99-100.
Wood and R.and Talling, J. (1988). Chemical and algal relationships in a salinity series of Ethiopian waters.
Zeleke Berie (2007). Diversity, relative abundance, and biology of fishes in Beles and Gelgel Beles Rivers, Abay basin, Ethiopia. MSc Thesis, Addis Ababa University, Eth iopia.108pp.