Distribution, size and feeding habits of Nanaethiops unitaeniatus Gunther, 1817 (Distichodontidae) in a Nigerian rainforest pond

Abstract

Aspects of the ecology of Nanaethiops unitaeniatus were studied in a rainforest wetland ecosystem (Mfangmfang pond) in Uyo, Nigeria. This fish occurred through out the year and was commonly found in association with the cyprinid, Barbus callipterus. They were often found in shoals of 20 or more fishes. They remained in open water during the day and retreated into shallow vegetated shore water at night. Total lengths varied between 32 and 76 mm. The length-weight relationship was negatively allometric. Feeding intensity increased with fish size and was higher during the night than day. Feeding occurred at the surface, mid water and bottom. The fish had a broad trophic spectrum with 21 dietaries. Algae and detritus were of primary importance.


Key words: Feeding Habits, Nanaethiops


Journal of Aquatic Sciences Vol.17(2) 2002: 113-120