The model predicts that the concentration of 90Sr in fish after the Fukushima Dai-ichi accident shall return to the background concentrations only 2 years later due to the delay of the transfer throughout the foodweb and specific accumulation of 90Sr. Cette cle de determination, destinee aux non-specialistes, est presentee sous forme d'organigrammes illustres et ne fait appel qu'a des caracteres morphologiques visibles sur les femelles, sans dissection ; les mâles, souvent absents ou tres peu nombreux, ne sont pas decrits ici. Pascal on May 30, 2017 POISSONS DU LAC DE BARRAGE DE MUMOSHO SUR LA RIVIERE RUZIZI (R.D. The food of Pygosteus pungitius is shown to be similar to that of Gasterosteus aculeatus, and to vary similarly. 0000007269 00000 n Based on diet overlap index, there is a moderate degree of overlapping of food preference between depik and kawan. – From April to June 2009, 207 fishes belonging to 6 genera were collected at Mumosho dam lake on Ruzizi River. The food relations of three species of fish (G. aculeatus, Pygosteus pungitius and Rutilus rutilus) in a a small muddy Cheshire stream are discussed. Congo. milieux où ils existent (Verbeke, 1957b ; Gosse, 1963 ; Thys chaîne trophique du nouveau lac. The Reseau distributes "gray literature", non-published or limited distribution government or NGO documents regarding the Great Lakes area of central Africa including Rwanda, Burundi, and the Democratic Republic of Congo. Insects and Algae are the sole kiKEYWORDS. However, their favorite food were Closteriopsis longissima and Arcella vulgaris. In Biologie et écologie des poissons d’eau douce africaine, C. Leveque, M.N. each food item is shown as a percentage of the total food eaten, all methods give substantially the same results. Bruton, G.W. Presse universitaire de Namur, Namur, 52pp. 0000000748 00000 n Higher food similarity was observed between length classes of 55-70 mm and 71-85 mm for depik; and between 71-85 mm and 101-115 mm for kawan. However, there is no information on the feeding biology of depik and kawan, hence here we ABSTRACT: The feeding habits of the straightfin barb Barbus paludinosus was studied in Lake Ziway, Ethiopia, from 504 gut samples collected from April to May (dry months) and July to August (wet months) of the year 2011. RESUME.-D'avril à juin 2009, 207 spécimens des poissons appartenant à 6 genres ont été capturés au petit lac de Barrage de Mumosho sur la Rivière Ruzizi. Scentongo eds.

It was concluded that the depik and kawan are plankton feeder (planktonphagous). 2(b)]. Reasons are, however, given for rejection of the method based on the number of organisms eaten, and also of the practice of comparing data so obtained with counts of the organisms found in samples of small areas of the substratum.

L'alimentation des poissons du lac Tchad n'a fait l'objet jusqu'à présent que d'études ... dier le rkgime alimentaire des espèces représentant au moins 1 O/o en poids du total des prises. Limnothrissa miodon est zooplanctonophage, Clarias est piscivo-malacophage, Barbus serait phytophage alors MOTS- CLES.- Régime alimentaire, compétition alimentaire, lac de barrage, rivière Ruzizi available kinds of preys. Alors que l’occurrence et le volume des différentes proies dans les contenus digestifs varient d’une espèce de poisson à l’autre [Fig. Elle permet l'identification des especes de Cladoceres vivant dans les eaux continentales de France ou des regions voisines d'Europe occidentale. Mulungula. The size of algae filtered by Dreissena was 40 μm, whereas the volume of bacteria was about 0.2 μm3 at their numbers of Depik (Rasbora tawarensis) and kawan (Poropuntius tawarensis) are endemic and threatened fishes occurring in Lake Laut Tawar, Indonesia. AIM: The present study investigated population structure, weight-length relationships, sex ratio and associations between feeding activity and reproductive period, diet and alimentary regime of Steindachnerina notonota at Taperoá II dam, semi-arid region of Paraíba State. Such comparisons have in the past been used to give numerical expression to the availability of food organisms; but it is suggested that this would be better accomplished by using an arbitrary method of allocation of points on the basis of estimated volume of each food item present (a) in the fish guts, and (b) in general faunal collections from the habitat. 0000001094 00000 n

Overall, increased consolidation of methods and analyses is recommended to facilitate comparative studies.Contribution to the Study of the Nutrional Requirements in the Larvas and Juveniles of the River Perch (Perca fluviatilis L.).
The contamination due to runoff of 90Sr from terrestrial surfaces was taken into account using a © 2008-2020 ResearchGate GmbH. Ce sont les algues, le zooplancles annélides, les mollusques, les poissons et les débris végétaux (Fig. The biomass and production of bacteria remained almost unchanged and depended on the development of zoo- and phytoplankton.

Using several criteria to evaluate the best-fitting model of gastric evacuation in fishes is also strongly advocated. RESULTS: Throughout the study period 120 individuals were collected, with total length ranging between 2.2 and 10.7 cm and weight between 0.31 and 43.1 g. A recruitment period, identified due to a higher abundance of small individuals in the population, was observed in the beginning of the rainy period of 2006, lasting until the beginning of the dry season.

Au niveau de ces exploitations qui sont gérées dans la majorité par des agriculteurs jeunes mais d'une grande expérience, seul le travail du sol était entièrement motorisé.
Their gut content analysis reveals that Limnothrissa miodon feeds on zooplankton whereas Clarias feeds on fishes and molluscs. METHODS: The region has the lowest pluviometric rates of Brazil. 0000001551 00000 n Several biological aspects of both species have been previously reported.

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