||Comparative trophic ecology of two sympatric tilapia, Oreochromis niloticus (Linné, 1758) and Saroth melanotheron (Rüppell, 1852) from Lake Toho, Southern Benin: Food competition and risk of species replacement
ADITE ALPHONSE ,
ARAME Hamidou ,
||International Journal of Fisheries and Aquatic Studies
||E-ISSN: 2347-5129 P-ISSN: 2394-0506
||Knowledge on trophic ecology of coexisting invasive and native fishes is of great importance for
fisheries management, species conservation, and ecosystem integrity. We investigated the feeding
ecology of two tilapias, Oreochromis niloticus, exotic and invasive, and Sarotherodon melanotheron,
native, in order to explore diet similarities and food competition between these two cichlids of Lake Toho
(Southern Benin). Fish individuals were sampled bimonthly from May-December 2013 in all habitats.
Sarotherodon melanotheron consumed about 107 food resources dominated by algae (86.88%) and
detritus (7.87%). Likewise, O. niloticus ingested about 65 food resources dominated by algae (62.75%)
and detritus (33.40%). Sarotherodon melanotheron exhibited a higher diet breadth (DB = 15.23), and the
high diet similarity index (Ø
=0.83) recorded indicated a high competition between the two cichlids.
Further research on species behavior, hybridization and food competition are required to assess risks of
native species replacement and the overall impacts of O. niloticus invasion.
||Alguivore, Competition, Hybridization, Invasive fish, Species replacement, Tilapiine
||365 - 375