Author(s): Effiong BN, Sanni A, Fakunle JO
Duckweed ( Lemna pauciscostata ) meal was experimented for its ability to partially replace fishmeal in the diet of Heterobranchus longifilis fingerlings under aquarium cu lture system. Five-dry diets formulated at 40% crude pr otein were fed to fingerlings (0.92g± 0.01) at 0%, 10%, 20%, 30% inclusion levels of duckweed meal where th e 0% served as control. The expe riment, which was conducted for 70 days, measured among other parameters feed conversion ratio (FCR), specific growth rate (SGR) and survival rate (S) in the fish samples. The fish were fed at 5% body weight twice daily morning and evening. Although the three inclusion leve ls of duckweed supported the growth of Heterobranchus longifilis fingerlings, growth performance and feed utilization was favored by low inclusion of duckweed meal. From the result, 10% duckweed meal inclusion gave the best final mean weight of 3.86g, mean weight gain (MWG) of 1.51g,feed conversion ratio (FCR) of 0.11,specific growth rate of 2.11% and percentage survival of 80%. There was no significant difference (P<0.005) in the growth parameters between 10% inclusion level and the control diet. [Report and Opinion. 2009;1(3):76-81]. (ISSN: 1553- 9873).