Reproduction et régime alimentaire de Distichodus antonii Schilthuis 1891 (Distichodontidae) dans la zone de confluence du fleuve Congo et des rivières Lindi et Tshopo à Kisangani (R.D. Congo)

Abstract

Reproduction and Feeding of Distichodus antonii Schilthuis 1891 (Distichopdontidae) in the Confluence Area of the Congo River and Rivers Lindi and Tshopo in Kisangani (R.D. Congo). The study of the reproduction and the feeding of D. antonii in the confluence area of the Congo river and rivers Lindi & Tshopo in Kisangani (R. D. Congo) was carried out across 105 fish. The species D. antonii has a phytophagous regime and does not seem to have a preference for a given species of semi-aquatic macrophyte. This diet shows the variation related to the seasonal periods and to the sex of the individuals. The species of plant ingested are: Bambusa vulgaris (Poaceae), Pseudospondias microcarpa (Anacardiaceae), Manihot esculenta (Euphorbiaceae), Commelina diffusa (Commelinaceae), Echinochloa pyramidalis (Poaceae), Vigna unguiculata (Fabaceae), Elaeis guineensis (Arecaceae), Musa paradisiaca (Musaceae) et Eicchornia crassipes (Pontederiaceae) but the organs consumed of these plants remain the leaves, stems, fruits, roots, and seeds. The evolution of the gonadosomatic ratio presents two peaks in april and september. The estimated absolute fertility varies from 94,000 to 344,500 oocytes for an average of 196,878±72,122 oocytes and the relative fertility varies from 11,750 to 73,600 oocytes kg-1 for an average of 38,224± 15,893 oocytes kg-1. The diameter of the oocytes varies from 0, 95 to 1, 42 mm with an average of 1, 16±1,13 mm. The absolute fertility is correlated to the total length according to F= 4,28 Lt5, 35.

Keywords

• Feeding
• Reproduction
• Distichodus antonii
• Congo River
• Tshopo and Lindi Rivers
• DR Congo