RésuméLe mouton de Vogan (MV) est une race ovine unique au Togo et serait issu de croisements entre la brebis Djallonké et le bélier sahélien. Il est très apprécié de par ses aptitudes zootechniques, mais son élevage est très localisé au sud-est du Togo. Ce travail vise l'étude des caractères phénotypiques de la race et la comparaison de ces caractères avec ceux des populations parentales (moutons Djallonké (MD) et moutons sahéliens (MS)). A cet effet, des données morphobiométriques ont été collectées en janvier 2013 sur 206 animaux dans les préfectures de Vô, de Kloto et d'Agou au Togo et sur 30 MS en mai 2013 autour de la ville de Bobo-Dioulasso au Burkina Faso. Les résultats obtenus ont montré que la couleur de la robe du MV est généralement bicolore (rousse, noire, chocolat), mais très variée. Les cornes, de forme variable, présentes chez tous les béliers, et fines ou en vestige chez les brebis, sont pour la plupart des cas prismatiques et orientées vers l'extérieur. Les caractères quantitatifs tels que la hauteur au garrot, la longueur du corps, la circonférence thoracique, la longueur de la queue, la longueur des oreilles, l'espace intercornes et la profondeur du thorax du MV sont inférieurs à ceux des MS, mais largement supérieurs à ceux des MD. La plupart des caractères du MV ont été influencés par le facteur canton (p<0,05). Cette étude a confirmé la position «intermédiaire» du MV. L'exploitation de cette précieuse ressource ovine passera par sa caractérisation et sa diffusion.
The seasonal accumulation of cadmium, copper, lead, mercury and zinc was determined in sediments, water, and black-chinned tilapia (Sarotherodon melanotheron; muscle, brain, kidney and liver tissues) collected monthly from Biétri Bay. The mean water concentration of metals (in mg L(-1)) ranged from 0.01 to 0.30 (mercury), 0.02-0.26 (cadmium), 2.40-4.80 (lead), 9.05-9.68 (copper), and 12.05-19.87 (zinc). The seasonal variations showed a significant difference in the levels of mercury, cadmium and lead among season. The highest mercury (0.30 ± 0.02 μg L(-1)), cadmium (0.26 ± 0.02 mg L(-1)) and lead (4.80 ± 1.03 mg L(-1)) levels were observed during dry season, while the lowest levels (0.21 ± 0.01, 0.02 ± 0.01 and 2.40 ± 0.02 mg L(-1), respectively mercury, cadmium and lead) were measured during rainy season. The average cadmium (0.58 ± 0.36 mg L(-1)), copper (42.15 ± 19.40 mg L(-1)), lead (58.47 ± 38.10 mg kg(-1)), mercury (0.79 ± 0.47 μg kg(-1)) and zinc (187.58 ± 76.99 mg kg(-1)) concentrations determined in Biétri Bay sediments showed a similar trend as in water. The seasonal variations of mercury, cadmium and lead in tissues revealed that these metals were higher concentrated during dry and swelling seasons. The levels of zinc and copper followed by lead were higher in the tissues. The order of tissues metals concentrations was: kidney > liver > brain > muscle.
RésuméLa reproduction de Trachinotus teraia a été étudiée dans la lagune Ebrié au cours de campagnes mensuelles pendant deux années consécutives (février 2004 à janvier 2006). Cette étude se situe dans le cadre d'acquisition de connaissances sur la biologie de Trachinotus teraia en vue d'évaluer son potentiel aquacole. Au total, 1806 spécimens dont 739 mâles, 746 femelles et 321 juvéniles ont été capturés à l'aide de filets maillants (mailles : 10, 14, 20, 25, 30, 35, 40, 50, 80
Abstract
Reproductive strategies of the Carangidae Trachinotus teraia Cuvier, 1832 in the Ebrié lagoon (Ivory Coast)Reproductive biology of Trachinotus teraia was studied in the Ebrié lagoon during two years (from February 2004 to January 2006 by monthly sampling using gill nets with stretched mesh sizes 10, 14, 20, 25, 30, 35, 40, 50, 80, and 100 mm
Objectives:The interest of this study is double. Firstly, these results allow for the characterisation of species assemblages, to identify their spatial distribution boundaries. Secondly, these findings are relevant to define spatial or ecosystem units in order to provide background for fisheries management. Methodology and Results: Samples were collected and studied at a grid of three zones during the cruise of investigation on board the Oceanographic Vessel ITAF DEME in March 2012. Forty-seven taxa belonging to four orders (Cephalopoda, Malacostraca, Chondrichtyes and Osteichtyes) were selected for analysis. Spatial differences in fish structure were analysed through different multivariate routines from PRIMER including between-matrix analysis of similarities (ANOSIM), species contributions to similarity/dissimilarity (SIMPER), non-metric multidimensional scaling (MDS) and group average cluster analysis. Typical or abundant species from those zones included fishes from the families Sparidae, Haemulidae, Carangidae. The most abundant species were Ariomma bondi (Ariommidae), Selene dorsalis (Carangidae), Brachydeuterus auritus and Pomadasys incisus (Haemulidae), Pagellus bellottii (Sparidae). The species Sardinella maderensis, Brachydeuterus auritus, Trachurus trecae and Selene dorsalis had the highest frequencies of occurrence. Conclusion and application: The distribution of the species halieutics is not uniform along the coast of Côte d'Ivoire. This study pointed to the fish resources of Côte d'Ivoire's Exclusive Economic Zone. These results will be used by the fishermen and for the development of adequate measures to prevent the loss of aquatic biodiversity.
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