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Feeding habits, length-weight relationship and condition factor of Chrysichthys nigrodigitatus (Lacepede, 1803) from Ogun River, Nigeria
10th Euro-Global Summit on Aquaculture & Fisheries
October 08-09, 2018 | London, United Kingdom
Adeosun F I, Odulate D O, Idowu A A, Ayorinde B J O and Saba A O
Federal University of Agriculture, Nigeria
Posters & Accepted Abstracts: J Aquac Res Development
Abstract:
This study evaluates the feeding habits, length-weight relationship and condition factor of Chrysichthys nigrodigitatus from Ogun River, Nigeria. Samples were collected for four months (February to May, 2013) and analyzed for length-weight relationship, condition factor and stomach contents. Standard lengths of C. nigrodigitatus ranged from 8.38-41.61 cm with a mean of 20.79+5.88 cm while the weights ranged from 24.12 g to 273.61 g with mean of 143.51+66.12 g. Length class 11.0-13.99 cm and 41-43.99 cm were the most and least frequently encountered with percentage frequency of 26.67% and 0.67%. Least squares regression of the transformed data gave an exponent b of 1.18, a of 0.68 with straight line equation Log W=Log 0.6821+1.1822 Log L. A significant positive linear relationship existed between body weight and standard length (r=0.80). Condition factor ranged between0.14 and 12.44 with a mean of 3.97+2.92. Size class 8-10.99 cm had the highest mean condition factor of 8.92+2.4 cm which ranged from 2.25-12.44 cm. A total of twenty eight stomachs (18.67%) were empty and diatoms, followed by green algae, appeared to be the most abundant food items accounting for 42.62% and 19.7% by number as well as 19.97% and 17.7% occurrence, respectively. The study concludes that C. nigrodigitatus demonstrates an overlapping feeding pattern and thus contributes to baseline information, not only, on the trophic status but, for conducting future studies on the species. The study presents a baseline data for the trophic status of the species in Ogun River.
Biography :
E-mail: adeosunfi@yahoo.com