Tag Archives: Feed Utilization

Growth Performance and Feed Utilization Efficiency of Juvenile Catfish Clarias Gariepinus Fed Heat Processed and Dehulled Jatropha Curcas Meal (Published)

The growth performance and feed utilization efficiency of juvenile Clarias gariepinus fed heat processed and dehulled Jatropha curcas kernel meal (JCKM) was investigated using 150 pieces of fish with an average weight of 8.9g which were randomly distributed into five experimental diets in replicates of ten (10) fish per tank for 42days. The processed JCKM used were: Sand roasted, Autoclaved, Boiled and Raw defatted meal in replacement of Soya-bean meal at 33.33% per diet. The diets were fed to C. gariepinus of juvenile at 5% body weight. The highest growth performance (170.07±11.12) and feed utilization efficiency (1.36±0.06) was recorded for fish fed with diet of no JCKM replacement followed by sand roasted JCKM based diet(45.03±10.30, 0.42±0.11). There was no significant difference between the two diets at p>0.05. The low fed utilization efficiency observed in fish fed boiled(0.05±0.03), autoclaved(-0.1±0.05) and raw defatted (0.04±0.03) JCKM leads to decrease in growth performance which can be due to high concentration of anti-nutritional factors such as Phorbol esters, Saponins and Curcin. Therefore, JCKM can be used to replace Soya beans at low quantity in the diet of freshwater fish when Sand-roasted.

Keywords: Clarias Gariepinus, Feed Utilization, Growth, Jatropha Curcas

Effect of Artificial Diets on Growth Performance, Body Composition and Gonad Maturation of Mullet (Liza Ramada) (Published)

This study was conducted to evaluate four different diets (fish oil FO, Palm oil PO, sunflower oil SO and mixed diet of three oils as 2% FO : 2%PO : 2%SO) on growth performance, body composition and gonad maturation of Liza ramada with an initial weight of 5.31±0.31g. Hundred fish were randomly distributed in twelve cement ponds with a volume of 2m3 each and fed for 120 days at a rate of 3% live body weight (BW) twice daily. The results showed significant differences (P<0.05) between diets. The highest growth performance, feed utilization and hepatosomatic index were obtained with the fish fed fish oil (FO) and Mixed diets, without significance difference between them. However, the fish fed palm oil (PO) and sunflower oil (SO) recorded less growth performance. Differences in certain fatty acid composition were detected but levels of saturated, mono-saturated and n-3 fatty acids recorded increased in each FO and mixed diets without significant differences between them. On the other hand, n-6 showed significantly increased in both palm oil (PO) and sunflower oil (SO) groups. The essential fatty acids (EFAs): arachidonic acid (ARA), ecosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) were different across treatment groups suggesting that Liza ramada can affected with different oil sources. In the second trial the mixed diet was fed to the broodstock fish in earthen ponds. The broodstock fish showed an increased in growth performance, feed efficiency, heptosomatic and gonadsomatic indices of Liza ramada. The implications of the results are discussed in terms of oil type effects, diet costs and gonad histology of Liza ramada broodstock.

Keywords: Body Composition, Broodstock, Fatty Acids, Feed Utilization, Fish Oil, Gonad Histology, Growth Performance, Liza Ramada, Palm Oil, sunflower oil