TEŽINSKO–DUŽINSKI ODNOS 57 RIBLJIH VRSTA U RIJEKAMA JUGOISTOČNOG DIJELA OBALE BJELOKOSTI

Weight–length relationships (WLR) of 57 fish species belonging to 22 families from the coastal rivers of the south–eastern of Ivory Coast were studied. Samples were collected with two fleets of monofilament gill nets. The value of the exponent b in the WLR (W=aLb) ranged from 2.213 to 3.729. The mean and the median values were 2.892 and 2.899 respectively, whereas 50% of the value ranged between 2.787 and 3.048. For 11 species, these relationships are described for the first time for this sub–region.U radu je istraživan težinsko–dužinski odnos (WRL) 57 vrsta riba koje su pripadale 22–dvjema porodicama, a koje se nalaze u rijekama jugoistočnog dijela Obale Bjelokosti. Uzorci su sakupljeni dvjema vrstama mreža. Vrijednost eksponenta b u WRL (W=aLb) kretao se između 2,213 i 3,729. Prosječna i srednja vrijednost bile su 2,892, odnosno 2,899, dok je 50% te vrijednosti bilo između 2,787 i 3,048. Za 11 vrsta ti su odnosi opisani prvi put u ovoj podregiji

Régime alimentaire de Engraulis encrasicolus (Linneaus, 1758) du littoral de la Côte d’Ivoire

Engraulis encrasicolus est un poisson téléostéen clupéiforme de la famille des Engraulidae. Le régime alimentaire général de E. encrasicolus dans le littoral de la Côte d’Ivoire a été étudié en fonction de la taille des individus et des saisons hydrologiques. Les poissons de 6 à 12 cm de longueur standard sont les captures des sennes de plage et sennes tournantes de septembre 2005 à Août 2006. Six cent dix estomacs ont été analysés dont 404 contenaient des proies et 206 étaient vides, soit 33,80% de vacuité. Ce coefficient a varié en fonction des saisons de crue et de décrue. L’indice de prépondérance (Ip) combinant les pourcentages d’occurrence corrigé (Fc) et pondéral (P) ont été utilisés pour analyser l’importance des différents items identifiés. Le régime alimentaire général est composé de 10 items regroupés en 4 catégories de proies : les copépodes, les cladocères, les macrophytes et les insectes. E. encrasicolus se nourrit principalement de Copépodes (68,14% de Ip) (Thermocyclops decipiens, Centropages chierchiae, temora turbinata et acartia claussi) dans la zone d’étude. Les cladocères, (Ip = 29,5%) sont consommés de manière  importante. Les macrophytes et les insectes sont des proies accessoires. Le régime alimentaire de E. encrasicolus varie avec la taille. Cette variation est une stratégie alimentaire en rapport avec des modifications  ontogénétiques, anatomiques et morphologiques chez les poissons. L’espèce adapte son régime alimentaire en fonction des saisons marines en relation avec la disponibilité des proies.Mots clés : Engraulidae, Engraulis encrasicolus, alimentation, littoral, Côte d’Ivoire

Effect of diets containing cocoa bean shell and coconut oil cake on the growth of Oreochromis niloticus (LINNE, 1758) in pond

A 180-day feeding trial was conducted at fish farm ‘’Blondey‘’ (Côte d’Ivoire) with Nile tilapia, Oreochromis niloticus (LINNE, 1758) to evaluate the effect of cocoa bean shell and coconut oil cake on its growth. Juvenile tilapia (mean weight of 33.16 ± 2.2 g) was fed with a commercial diet (Ivograin) and two formulated diets twice daily (09.00 h and 15.00 h). The used stocking density was 2 fish/m2. Formulated diets were designated as D1 (cocoa bean shell, corn bran, soybean oil cake and cottonseeds oil cake) and D2 (coconut oil cake, corn bran, soybean oil cake and cottonseeds oil cake). All the tested diets contain around 28% protein and each diet was randomly assigned to triplicate ponds to evaluate growth, feed utilization, body composition and cost benefit. Fish fed diet with D1 gave the highest daily weight gain (1.94 ± 0.30 g/day) and the best feed conversion ratio (2.01). The lowest daily weight gain (1.53 ± 0.32 g/day) and the highest feed conversion ratio (2.47) were recorded for diet D2. Tilapia fed with diet D2 and commercial one (Ivograin) displayed similar growth and feed efficiencies patterns. Lipid accumulation was higher in fish reared with diets D1 and D2 compared to reference diet (Ivograin). Diets D1 and D2 reduce feed costs per unit of weight gain by 34.44 and 19.47%, respectively, compared to commercial diet.Keywords: Oreochromis niloticus, feeding, cocoa bean shell, coconut oil cake, growth, Côte d’Ivoire

Short grammar of Tiefo-N of Nyafogo (Gur, Burkina Faso)

short grammar of Tiefo-N, Tiefo of Nyafogo, Burkina FasoNational Science Foundation, Documenting Endangered Languages programhttps://deepblue.lib.umich.edu/bitstream/2027.42/139024/1/Heath Ouattara Hantgan Short Grammar Tiefo N reduced.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/139024/2/Heath Ouattara Hantgan Short Grammar Tiefo N reduced.docxDescription of Heath Ouattara Hantgan Short Grammar Tiefo N reduced.pdf : book in pdf formDescription of Heath Ouattara Hantgan Short Grammar Tiefo N reduced.docx : original .docx fil

Full 3D Compact Histogram Segmentation of Color Images

In this study we present a fast unsupervised segmentation method of color images based on the 3D compact histograms. In order to resolve the problems of handling 3D histograms and to palliate the defects of the marginal and bi-marginal approaches, the use of the 3D compact histogram to accomplish classification in the color space RGB proved to be necessary. The interest of this study is based on the use of compact histogram which is a structure with reduced volume of colors without loss of data of the classical histogram and favouring a fast segmentation of color images. Knowing that there is no universal method of segmentation, our aim is to realize an acceptable segmentation that is the most relevant in the sense of a criterion of evaluation of segmentation. The relevance of the choice of peaks is not evident generally and is complexified when the dimension of the space increases; because of the integration of fuzzy neighborhood associated with an algorithm of connected components labeling in our algorithm of classification establishes the first approach of segmentation. The second approach consists in re-quantifying the colors of the histogram before making the classification, this limit the time consuming of segmentation and the effects of over-segmentation; this also the purpose of the first approach. A stage of performance appraisal of segmentation allows bringing to light the relevance of both methods and a comparison of both approaches is so discussed