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Articles by S.O. Ovie
Total Records ( 2 ) for S.O. Ovie
  S.O. Ovie and S.S. Eze
  In the use of plant based ingredients for production of cost effective feed, lysine being one of the deficient amino acid in such feed must be present in the required quantity for Oreochromis niloticus in order to impact on its production positively. This study was carried out to investigate the lysine requirement and its effect on the body composition of Oreochromis niloticus fingerlings. Two hundred and seventy fingerling O. niloticus (9.01-11.09 g) were reared in 35 L plastic troughs. Six diets were formulated, containing 35% crude protein. The diets were formulated with ingredients deficient of lysine (Groundnut cake -3.23 g lysine/100 g diet and guinea corn -1.9 g lysine/100 g diet) for O. niloticus having whole body content of 7.51 g lysine/100 g protein. The diets consist of a basal diet (Diet I, no added lysine), while the test diets (II, III, IV and V) had 4.56, 6.87, 7.30, 7.41 g lysine/100 g protein, respectively. The reference diet was made of Clupeids (mixture of Pellonula afzeliusi and Physalia pellucida), groundnut cake and guinea corn but no added lysine (5.37 g lysine/100 g protein). The fish were fed twice daily (09.00 and 18.00 h) at 3% body weight for 56 days. There was significant difference in the mean weight gain and food conversion efficiency (p<0.05). The four levels of lysine resulted in quadratic responses (p<0.05). Calculation using regression equations from the relationship between the specific growth rate, weight gain and lysine levels show that lysine requirement for fingerling was 7.12 g/100 g protein, respectively. The requirement of O. niloticus for lysine is 7.12 g lysine/100 g protein.
  S.O. Ovie and S.S. Eze
  Atya crassa like its relative Macrobrachium species can be a source of foreign exchange for Nigeria. The Atya crassa was cultured in indoor and outdoor rearing systems to investigate the possibility of its growth and production in captivity. A. crassa of sizes ranging 7.05±0.13-8.5±0.05 g were purchased from fishermen around the Jebba Lake. They were transported in open Jerry cans in a cold van for about 2 h. The indoor tanks measured 3x2x1.5 m and were stocked 17 prawns per tank while the outdoor tanks were 2x2x1.5 m and stocked 10 prawns per tank. The experimental diets were formulated with crude protein levels 30, 35 and 40%. Each diet was assigned to two tanks each indoors and outdoors. They were fed twice daily (9 and 19 h) for 184 days. Positive growth was observed in both indoor and outdoor tanks. There was no significant difference in the growth of prawns fed outdoor (p>0.05) while there was significant difference indoors. The percentage survival of prawns was higher outdoors and there was no significant difference (p>0.05) while there was significant difference (p<0.05) in the survival indoors. The carcass composition of A. crassa fed the three diets showed crude protein lower at harvest than the prawns stocked initially. Percentage lipid, ash and fibre of the harvested prawns were higher than at initial stocking. A. crassa is cultivable in freshwater and it should be reared with 30% crude protein diet in outdoor systems.
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