Open AccessReproductive performance of female Nile tilapia Oreochromis niloticus L. in South Kivu (DR Congo): comparison of two strains differing in origin and history of domestication
Author(s) -
F.J. Nihoreye,
U.N. Nyongombe,
L.G. Alunga,
Akonkwa Balagizi,
Mwapu Pascal Isumbisho,
O.F. Okitayela
Publication year - 2019
Publication title -
international journal of scientific research and management
Language(s) - English
Resource type - Journals
ISSN - 2321-3418
DOI - 10.18535/ijsrm/v7i8.mp02
Subject(s) - nile tilapia , oreochromis , domestication , fecundity , biology , strain (injury) , sexual maturity , zoology , fertility , veterinary medicine , sex ratio , fish <actinopterygii> , fishery , ecology , demography , population , medicine , anatomy , sociology
This study was conducted to evaluate the reproductive performance of females of Oreochromis niloticus originating from a strain of distant origin and extensively exploited in fish farming (Nyakabera strain) and a local strain recently removed from the natural environment (Lac Kivu strain). The experiment was carried out in triplicate with fry of 4.9 to 6.3 g placed in earthen ponds for a period of 6 months, at the Nyakabera fish station in South Kivu, Democratic Republic of Congo. The comparison of the two strains focused on the size of the first sexual maturity, gonado-somatic ratio, fecundity, egg diameter and condition factor. The results showed that under similar managed rearing conditions, the Nyakabera strain reaches sexual maturity earlier and is characterized by a higher gonado-somatic ratio and higher relative fertility, but a worse condition compared to the Lac Kivu strain. These differences, which indicate a better reproductive success of the Nyakabera strain, are related to the origin and the history of domestication, which are just as different from these two strains.