Veterinary Medicine
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Item Size variation, growth and body conformation of reciprocal hybrids of Clarias gariepinus (Burchell 1822) and Heterobranchus bidorsalis (Geoffroy, 1809).(Nigerian Institute for Oceanography and Marine Research, 1996) Uka A.; Oladosu G. A.; Ayinla O. A.Reciprocal hybrids of Clarias gariepinus and Heterobranchus bidorsalis were compared for size variation, growth and body conformation. Growth was observed to be significantly faster (P<0.05), and size variation less pronounced (CV = 26%) for C. gariepinus (female) and H. bidorsalis (male) hybrid, than the reciprocal (CV=38%) No difference was observed in the body conformation between the reciprocal hybrids. However, the percent head length of the standard length was significantly smaller (P<0.05) in the reciprocal hybrids than that observed for the parent species.Item Morphometric and blood group characterization of different populations of Clarias gariepinus(Faculty of Agriculture, University of Benin, Nigeria, 2004) Uka A.; Ayinla O. A.; Oladosu G. A.Experiments were conducted to compare the blood group antigen and morphometric features of three populations of Clarias gariepinus described according to the source of their farmed parents as ARAC, Holland and Osogbo. Differences in morphometric features were studied in three replicates of 50 individuals per replicate grown in earthen pond for 150 days, while Blood group antigen differences were studied on slide agglutination test using human antisera. The fish were fed twice daily with 22% crude protein feed. Feeding ration was gradually reduced from 20% body weight in the first 30 days to 5% body weight at day 121 to 150. Water temperature, pH and dissolved oxygen were determined two days in a week between 9am and 11am. The three populations differed significantly (P<0.05) from each other in the prepelvic ratio of the standard length, but showed common morphometric features in the head length and head width ratios of the standard length and the proportion of the standard length to the total length. However, the proportion of intra-orbital width of the standard length was significantly lower (P<0.05) in Osogbo population than in ARAC and Holland populations, while the proportion of the prepectoral distance of the standard length was significantly lower (P<0.01) in Holland population than ARAC and Osogbo population. There was no difference in the red cell agglutination test among the populations; agglutination characteristic of blood group O' rhesus negative was observed in all the individuals of the three populations. Differences in water quality parameters were not significant (P>0.05). Values obtained ranged from 27.50 to 27.87°C, 6.55 to 7.56 and 5.68 to 7.70mg/l for temperature, pH and Dissolved oxygen respectively.Item Predation by aquatic insects on African catfish fry(Chapman & Hall, 1997) Adeyemo A. A.; Yakubu, A. F.; Oladosu G. A.; Ayinla O. A.Item Design and construction of a shrimp hatchery for the breeding of the black tiger shrimp Peneaus monodon(Fisheries Society of Nigeria, 2009) Ayinla O. A.; Anyanwu P. E.; Atakpu J. A.; Ebonwu B. I.; Hamzat M. B.; Ihimekpen F. A.; Oladosu G. A.; Adeleke T. A.; Matanmi M. A.; Afolabi E. S.; Oguntade O. R.; Ayaobu-Cookey I. K.; Asikhia G. I.; Oseni A.; Olaluwoye L. B.; Ajijo M. R.A shrimp hatchery for the breeding of the black tiger shrimp, Penaeus monodon was constructed the Nigeria Institute for Oceanography and Marine Research in 2008 by the reconstruction of an existing old shrimp hatchery. The new shrimp hatchery comprises of the following: water treatment, water storage, broodstock maturation, spawning/incubation, nursery and micro-algae units. The design included the construction of a concrete sump for the collection and treatment of wastewater before disposal, in addition to an acration unit equipped with root blower for adequate supply of dissolved oxygen. The reconstructed NIOMR shrimp hatchery has been successfully used for the production of post larvae, which are presently being reared to adult shrimp in concrete tanks. The successful completion of the shrimp hatchery and breeding of P. monodon has confirmed that the species can be spawned and reared to adult size in Nigeria for local and export markets.