In spite of the growing interest and success obtained using cultured-copepods, their use in marine aquaculture remains sporadic. Besides, mass culture of several marine copepods has been well established by several authors. However, the upscale of copepod cultures to commercial levels is still a challenge. The practice of using wild copepods from natural ponds which thus increases the risk of parasitic infections of most species has limited their application in aquaculture. The present paper thus emphasizes on recent research efforts focused on the use of chemical treatments and freeze-thawing methods to eradicate procercoids from copepods. Research efforts focused on copepod culture systems which subsequently improved and refined their culture in marine fish larviculture are also well discussed. Advances in the use of copepod eggs as potential source of nauplii for marine fish larvae with special emphasis on the viability, storage conditions and biochemical compositions of the copepod eggs are underscored. Additionally, recent advances in the biochemical compositions (protein, amino acids, pigments, and vitamins) of copepods, which has received relatively little attention compared to researches on the lipid and fatty acid compositions are well emphasized. Specific recommended areas for further research are also proffered.

The growth performance and survival rate of Clarias gariepinus burchell, 1822 and Heterobranchus longifilis valenciesnnes, 1840 under water recirculation system were examined. The post fingerlings of the two species were stocked at 486 fish/m 3 /tank and fed coppens® feed for sixteen weeks. Fish body weights were determined bi-weekly using electronic weighing balance. Final mean weight of 170.49 a ± 14.39g (C. gariepinus) and 42.78 b ± 1.57g (H. longifilis) were obtained. H. longifilis had a better survival rate (86.21%) compared to C. gariepinus (66.94%). The performance index (PI) showed that C. gariepinus (PI=101.90 b ) performed better than H. longifilis (PI=30.50 a ). The water quality variables were similar in the culture tanks. The results of the present experiment showed that post fingerlings of the two species of clariid catfish have different growth performance, survival and feed utilization efficiency under water recirculation system with C. gariepinus having better growth performance and yield than H. longifilis.Therefore, the culture of Clarias gariepinus clariid catfish under water recirculation system is recommended for better yield and profitability.

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Mono-sex population of Oreochromis niloticus fingerlings were collected from Nigerian Institute for oceanography and Marine Research Sapele station Hatchery and acclimatized for a week and randomly stocked at density of 300 fish/tank in nine fibre glass tank. The fingerling were fed daily 800h and 1600h with three different types of feed (Dry chicken manure, mixture of chicken manure and commercial diet, and commercial (coppens) only. Each treatment was replicated three times. The water quality parameters are within tolerant limit. The growth response in all the treatment wee generally satisfactory. Though treatment T3 Tanks fed with commercial diet only (coppens) had better growth performance compared with treatment T2 and T1, chicken manure and mixture of chicken manure and commercial diet respectively. The results demonstrate the feasibility of rearing all male tilapia (O. niloticus) fingerlings in fiber glass tanks.