Victor Tosin Okomoda, Lateef Oloyede Tiamiyu and Gabriel Wase
The performance of Clarias gariepinus (Burchell, 1822) fingerlings reared in white, green, blue, black and red coloured tanks was investigated. Each colour was tested in triplicate 1 m3 tanks with an initial stocking density of 100 fingerlings per tank (1.07 g). Fish were fed a commercial diet at 5% body weight per day for eight weeks. Fish weights were sampled every 2 weeks to adjust feeding rates. Tank colour had a significant effect (P < 0.05) on the overall performance of the fingerlings. Rearing in black tanks resulted in a higher daily feed intake (0.44 g) and better growth performance when compared to other tank colours, while the poorest performance was observed in blue and green tanks. Carcass protein and fat content at 8 weeks revealed a trend similar to that observed for growth. Also, serum glucose tests showed higher levels in light background tanks and were thought to be an indication of stress. Survival was not affected by tank colour. It was concluded that dark-coloured tanks such as black or red were better in comparison to light-coloured tanks for the rearing of African catfish fingerlings
Shola Gabriel Solomon, Lateef Oloyede Tiamiyu, Victor Tosin Okomoda and Kamwan Adaga
This study was conducted to determine the effect of storage conditions on the quality of feed and the aftermath effect of feeding fish with such feeds. Three commercial diets used for this study included Coppens®, Multifeed® and Vital feed®. Feed was stored either by opening the bag to the atmosphere (WO), the bag opened with neck tied using a rubber ring to prevent exposure to the atmosphere (OT) or sealed (SC) until the start of the feeding trials. The feed was stored under these conditions for six months. Nutrient analyses revealed significant changes in feeds held under the WO condition when compared with other storage conditions. Nutritive changes also varied with commercial feed type. Mould infestation of the feed was noticeable more in the WO condition of storage compared to the SC condition. After feeding C. gariepinus for fifty-six days, lesions were observed on fish fed mouldy feed held under the WO condition, which led to mass mortalities. Growth performance was higher in all fish fed SC stored feed, and for those fed Coppens® and Multifeed® under OT storage conditions. It is advised that storage of fish feeds up to six months should be undertaken with considerable care and attention.
Victor Tosin Okomoda, Lateef Oloyede Tiamiyu and Matins Iortim
The aim of this study was to determine the effect of different water change frequency on the growth of African catfish Clarias gariepinus. Fingerlings with initial mean weights of 7.02 ± 0.05g were stocked (50 fish each) in fifteen concrete tanks (2×2×2m) and were conditioned under five different treatments of water renewal, namely: TRT1 (no water change), TRT2 (water renewed daily), TRT3 (water renewed after four days), TRT4 (water renewed after eight days) and TRT5 (water renewed after fourteen days). After 56 days of feeding, results revealed best growth performance of fingerlings in tanks with water renewal frequency of TRT3 and TRT4. Similarly, survival was higher in these frequencies compared to the others; the control treatment, however, had the least performance for all parameters measured. It is therefore recommended that water renewal should be done once between four and eight days to enhance growth of African catfish fingerlings reared in a static system.
Ibrahim Adeshina, Ramatu Abdulkareem Sani, Yusuf Adetunji Adewale, Lateef Oloyede Tiamiyu and Samuel Bem Umma
The growth performance, nutrient utilization and health status of Cyprinus carpio fed various levels of Moringa oleifera leaf meal as a replacement for soybean meal was investigated. Six isonitrogenous diets were formulated with Moringa oleifera leaf meal at 0%, 10%, 20%, 30%, 40% or 50% crude protein replacement. The diets were fed to the fish at 5% body weight to 360 Cyprinus carpio juveniles (8.12±0.21 g) allotted to 18 happas (1 m3) in a completely randomized design for 12 weeks. The results revealed that crude protein replacement levels of 30% had significantly better final weight, weight gain, specific growth rate, protein efficiency ratio and feed conversion ratio, while survival rates were not significantly different. Also, haematological, biochemical and immune responses of the fish fed Moringa oleifera leaf meal fortified diets were significantly improved. The results further suggest that higher inclusion replacement is possible but opined that, for growth and economic consideration, Moringa oleifera leaf meal could be used to replace 30% crude protein of soybean in the diet of Cyprinus carpio juveniles.