http://196.220.128.81:8080/xmlui/handle/123456789/156 2026-08-12T12:28:28Z http://196.220.128.81:8080/xmlui/handle/123456789/6028 EFFECT OF BROODSTOCK SIZE ON THE SURVIVAL AND GROWTH OF HYBRID CATFISH (Clarias gariepinus S? and Heterobranchus longifilis 0') ODEDEYI, DOMINIC OLABODE Investigation on the effect of broodstock size on fry survival and growth during the primary rearing phase (14 days) of the hybrid of female Clarias gariepinus and male Heterobranchus longifilis in glass aquaria was carried out. The use of small size-range broodstock (:$ 250g) resulted in higher percentages fertilization than broodstocks of medium size-range (300- 650g) and large size-range (700- 950g). The percentage egg hatching and fry survival were not significantly (P > 0.05) influenced by the weight and size of the broodstock, During the secondary rearing phase (56 days duration) growth and survival of the fingerlings of the same group of fish in hapa net cages were studied. Fingerlings from large size-range broodstock had the greatest average daily growth but fingerlings from medium size-range had the best specific growth rate and was significantly different (P < 0.05) from the other treatments. The percentage fingerling survival for the treatments were similar. Cost-benefit analysis of production revealed that it is most profitable to use broodstocks of medium size-range (300- 650g) than smaller or larger broodstocks for optimum fingerlings production. 65p.ill:30cm 1997-07-01T00:00:00Z http://196.220.128.81:8080/xmlui/handle/123456789/6027 THE LAND USE PATTERN OF IFON GAME RESERVE, ONDO STATE LATEEF, OLOFINJANA SUBERU In an attempt to investigate the level of human encroachment in Ifon Game Reserve, 5% of the six villages were randomly selected at different regions of the reserve. The selection was done in a way that all ecological zones were represented. The following methods were used for the study: Oral interview, questionnaire and direct observation. The following parameters were considered: Population density, occupation, proximity to the reserve, and nature of damages done to biodiversity in the reserve. Photographs of important places and features were taken. Results were analysed using percentage distribution ranges. Graphical representation were used. Results showed that a large population illegal occupants are resident in the reserve. The illegal residents carry out a lot of nefarious activities on the park such as poaching, logging, fishing, mining, cultivation, bush burning and road construction. Suggestions for effective control of the various destructive activities of man and the methods of maintaining the reserve for meeting with the objectives with which it was established were made. 99p.ill:30cm 1998-08-13T00:00:00Z http://196.220.128.81:8080/xmlui/handle/123456789/6026 REPLACEMENT VALUE OF JACKBEAN MEAL FOR SOYBEAN MEAL IN NILE TILAPIA. {Oreochromis niloticus) DIETS JIMOH, WASIU ADEYEMI Replacement value of jackbean meal for soybean meal as a dietary component for Tilapia, Oreochromis niloticus was evaluated. Four isonitrogenous and isocaloric (30% crude protein) diets were fed to Oreochromis niloticus fingerlings (6.36 ± 0.07g) in a glass tank for70days. The soybean meal in the diet was replaced at the rate or 20, 30 and 40% to serve as test-diet D20, D30 and D40 respectively while a diet without jackbean meal served as control (CTR). There were no significant differences (P > 0.05) in specific growth rate, weight gain, % weight gain and protein efficiency ratio between the fish fed control diet and diet D20 . Diet D40 differed significantly (P < 0.05) from diet CTR, D20 and D30. However, there was no significant difference (P > 0.05) in the protein efficiency between the fish fed control diet and test diets. Significant (P < 0.05) variation occurred in nutrient (Protein) digestibility of fish fed control diets and test diets. However, there were no significant differences in lipid and organic matter digestibility of fish fed control diets and test diets. The profitability of feeding fish with the test diet was positive (as attested to by profit index). The incidence costs of producing 1kg of fish with the control diet and test diets 020, D30 and D40 showed that it was cheaper to produce 1kg of fish with diets D20 and D30. The results showed that it is technically feasible, biologically and economically effective to replace soybean meal up to 30% with jackbean in the practical diets of Oreochromis niloticus . 91p.ill:30cm 2004-05-01T00:00:00Z http://196.220.128.81:8080/xmlui/handle/123456789/6025 REPLACEMENT Of FlSHMEAL WITH SHRIMP WASTE SILAGE IN DIETS Of AFRICAN CATFISH CLARIAS GARIEPINUS (BURCHELL. 1822) FINGERLINGS IHIMEKPEN, A. FRIDAY Five (5kg) of raw mixed shrimp waste was fermented with 250ml of Lactobacillus plantarum, using 750g of cane molasses as carbohydrate source. After incubation for 14 days, a desirable and stable pH of 4.39 was attained, the product was co-dried with 15% (750g) hydrolysed feather meal. The blends were evaluated as protein providing 58.90% crude protein. The dried shrimp waste silage meal were incorporated as protein supplement into pelleted diets for catfish Clarias gariepinus fingerlings (12.05±0.03g) at 0%, 5%, 10%, 20%, 30% and 40% (diets 1- 6) as replacement levels for brown fishmeal (72% protein). The effects of the diets of the shrimp waste silage (diets 1-6) on the growth and economic performance of the catfish fingerlings were evaluated. Results showed that catfish fed diets 1- 6 (0- 40%) showed no significant difference (P>0.05) in food conversion ratio (FCR), specific growth rate (SGR), protein efficiency ratio (PER) and apparent digestibility of nutrient (ADC protein) but there were significant difference (P<0.05) in protein productive value (PPV) among the(P>0.05) treatments. However, the fingerlings fed diets 1- 5 (0-30%) showed no significant difference (P<0.05) in mean weight gain but differed significantly (P~0.05) with the mean weight gain of the fish fed diet 6 (40%). The result showed that the best profit margin would be realized by feeding the catfish with 30% (diet 5) fermented shrimp waste silage meal. It was concluded that dried fermented shrimp waste silage meal is suitable and has a great potential feedstuff in African catfish diets up to 30% replacement for the highly expensive fishmeal. 96p.ill:30cm 2003-09-05T00:00:00Z