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Articles by M.A. Anetekhai
Total Records ( 5 ) for M.A. Anetekhai
  A.A. Jimoh , E.O. Clarke , O.O. Whenu , M.A. Anetekhai and P.E. Ndimele
  Studies on the morphological characterization of the African river prawn, Macrobrachium vollenhovenii and the brackish water prawn, Macrobrachium macrobrachion from Badagry Creek in Southwest Nigeria were carried out. Samples of M. vollenhovenii (n = 275) and M. macrobrachion (n = 790) were collected from Badagry Creek. Morphometric analysis showed that M. vollenhovenii and M. macrobrachion exhibited positive allometric growth with “b” values of 3.11 and 2.58, respectively. M. vollenhovenii (6.29±3.48 g) was larger than M. macrobrachion (4.75±2.43 g). The males of both species were larger than the females. The correlation between Total Length (TL) and Body Weight (BW) was high and positive (M. vollenhovenii, r = 0.95; M. macrobrachion, r = 0.87). A significant (p<0.05) positive correlation occurred between TL and Carapace Length, (CL) (M. vollenhovenii, r = 0.83; M. macrobrachion, r = 0.66) and between TL and rostral length, RL (M. vollenhovenii, r = 0.73; M. macrobrachion, r = 0.79). Dorsally, M. vollenhovenii and M. macrobrachion had 6-14 (mean = 9.84±1.35) and 7-15 (mean = 9.38±0.84) rostral spines, respectively while on the ventral side of the rostrum, M. vollenhovenii had 3-8 spines (mean = 5.15±0.76) and M. macrobrachion had 3-10 spines (mean = 5.34±0.61). Female M. macrobrachion and M. vollenhovenii predominated with sex ratios of 1:3.73 (p<0.05) and 1:1.05 (p>0.05), respectively. There appears to be exploitation pressure on these prawns in Badagry Creek. Therefore, there is need for some management measures to be taken.
  F.G. Owodeinde , K.A. Fakoya and M.A. Anetekhai
  Fish seed of the right quality and quantity remain a major challenge facing aquaculture in Nigeria. This study was conducted to evaluate the potentials for culturing the hybrid of Clarias gariepinus (♀)xHeterobranchus bidorsalis (♂) (Heteroclarias) to commercial size in earthen ponds. Three earthen ponds 0.02 hectares were stocked each with 330 fingerlings of Clarias gariepinus (♀)xHeterobranchus bidorsalis (♂) hybrid (popularly called Heteroclarias) on the 1st February, 2010. Mean weight at stocking was 7.50±1.50 g. The fish were fed 3% of their body weight two times daily with compounded artificial feed containing 45% crude protein. The changes in length and weight of the fish were measured fortnightly and the feed fed to the fish were accordingly adjusted to reflect the changes in weight. Temperature, dissolved oxygen, pH and total ammonia-nitrogen were measured in each pond. Survival rates, specific growth rate and condition factor were also determined. Survival at harvest (24 weeks after stocking) was 97.3% and the mean weight of the fish was 880±78.72 g (ranged, 610-1150 g). Standing crop at harvest was 282.48 kg/0.02 ha (14,124 kg ha-1). Growth of hybrid (Heteroclarias) was positively correlated with the number of weeks of the study (R = 0.9). Results demonstrated the potential of Heteroclarias for use in aquaculture and indicate that the fish species can be grown to commercial size within 24 weeks from fingerling stage under semi-intensive pond condition. The best time to selectively harvest the fish for maximum gain in terms of good growth and maximum profit on feed utilization is also 24 weeks.
  P.E. Ndimele , C.A. Kumolu- Johnson and M.A. Anetekhai
  Heavy metals remain pollutants of great concern to ecologists because of its persistent nature in the environment and its adverse effects on aquatic biota and man. The levels of four heavy metals (Cu, Fe, Zn and Pb) were investigated between January, 2010 and December, 2010 in three sampling stations (Agbara, Imude and Obele) of Ologe Lagoon. The metal contents were measured in water column, sediment and Chrysichthys nigrodigitatus. The highest concentration (972.99±60.93 μg L-1) of Zn in water was recorded in Obele while the lowest value (581.14±42.36 μg L-1) occurred in Imude. The concentrations of the heavy metals in sediments of all the sampling stations was significant (p<0.05). The highest concentrations of Cu (1.25±0.09 μg g-1) and Pb (4.11±0.29 μg g-1) in sediment were recorded in Obele while their lowest values (Cu, 0.55±0.05 μg g-1; Pb, 0.13±0.02 μg g-1) occurred in Imude. The values of the heavy metals in C. nigrodigitatus from Agbara was significantly (p<0.05) higher than the values recorded in the other sampling stations. The highest concentrations of Fe (44.30±1.76 μg g-1), Zn (26.43±1.37 μg g-1) and Pb (0.17±0.04 μg g-1) in C. nigrodigitatus were reported in Agbara while their lowest values (Fe, 24.41±1.01 μg g-1; Zn, 14.82±0.98 μg g-1; Pb, 0.02±0.01 μg g-1) occurred in Obele. Seasonal dynamics had effect on metal content of water and sediment but its effect was not significant (p>0.05) in C. nigrodigitatus except for Cu. This study has shown that Ologe Lagoon contains heavy metals. However, these heavy metals are still within the limits considered safe for human consumption.
  F.G. Owodeinde , P.E. Ndimele and M.A. Anetekhai
  This study was conducted to assess the reproductive performance, growth rate and nutrient utilization capacities of pure breed Heterobranchus bidorsalis (H. bidorsalis ♀ x H. bidorsalis ♂) and its hybrid (H. bidorsalis ♀ x C. gariepinus ♂) (Clariabranchus) induced with synthetic hormone (ovaprim) and pituitary of male and female Heterobranchus bidorsalis. In this study, 3 female Heterobranchus bidorsalis, 3 male Heterobranchus bidorsalis and 3 male Clarias gariepinus were used for the experiment. One female H. bidorsalis induced with ovaprim produced eggs which were divided into two equal halves. Each half was fertilized separately by milt from H. bidorsalis and C. gariepinus to produce pure breed and hybrid, respectively. A similar crossing was done for the female H. bidorsalis induced with Male Pituitary Extract (MPE) and Female Pituitary Extract (FPE). Percentage fertilization and hatching rate of pure breed induced with ovaprim were significantly (p<0.05) higher than the other genetic crosses. The highest values for weight gain (5.46±1.58 g), average daily growth (0.39±0.11 g) and specific growth rate (1.04±0.16%/day) occurred in pure breed induced with MPE. The lowest values for these growth parameters were obtained in the hybrid induced with FPE. Feed intake, protein intake, feed conversion ratio and protein efficiency ratio varied significantly (p<0.05) among the treatments. This study has shown that the pure breeds and hybrids induced with ovaprim and MPE performed better than those induced with FPE. Therefore, they are recommended for commercial aquaculture.
  P.E. Ndimele , C.A. Kumolu-Johnson and M.A. Anetekhai
  Water hyacinth (Eichhornia crassipes) which have been described as the most troublesome weed in the world have been linked to several problems like obstruction to water transportation, micro-habitat for disease vectors, obstruction to fishing and reduction in biodiversity. However, recent studies have also shown that this macrophyte can be used for the production of paper, biogas, fertilizer, fish feed and in the clean-up of polluted environment (phytoremediation). It becomes important to fully harness the potentials of this aquatic macrophyte, which could change its status from a weed to an income-generating plant.
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