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Articles by B.A. Shinkafi
Total Records ( 5 ) for B.A. Shinkafi
  B.A. Shinkafi and B.D. Ilesanmi
  Effect of varying doses of Ovatide on the breeding performance of Clarias gariepinus in Sokoto, North-western Nigeria was investigated. The females weighed between 330 to 1078.50 g while the males weighed 317 to 542.40 g. Eight gravid brood stocks were injected intramuscularly at different dose levels of 0.10 (treatment I), 0.15 (treatment II), 0.20 (treatment III) and 0.25 (treatment IV) mL kg-1 b.wt. (Bw), at a water temperature of 30°C to assess their breeding performance. The experiment was replicated in a completely randomized design. The results showed that the size of eggs did not vary among the samples based on all the treatments. The female of treatment IV had the highest spawning fecundity (149,796), weight (228 g) and percentage of eggs stripped (21.14%). Treatment III had the highest percentage of fertilized eggs (95.45%) which was significantly (p<0.05) higher than in the other treatments. Treatment II had the highest hatchability (65.28%), number of hatchlings (3,017) and total weight of hatchlings (12.07 g). It was concluded that C. gariepinus of about 400 g can successfully be induced to ovulate using 0.15 mL kg-1 b.wt. in Sokoto, Nigeria which was lower than the manufacturer’s recommended dosage of 0.20 mL kg-1 b.wt.
  B.A. Shinkafi and A.I. Daneji
  This study was carried out to gain knowledge on some aspects of reproduction of S. eupterus from River Rima which includes sexual dimorphism, size at first maturity, morphology of the gonads, gonad maturation stages and reproductive cycle. The study was conducted between November 2005 and December 2008. 1,610 samples, comprising of 781 females, 816 males and 13 samples whose sexes could not be identified were examined, giving a female: male ratio of almost 1:1. Means of total length and total weight for females was 10.66±1.61 cm and 18.04±6.39 g, respectively. For males, means of total length and total weight were 10.13±1.29 cm and 13.21±6.02 g, respectively. Sexual dimorphism was observed with the females larger than males and males possessing genital papilla. Size at first maturity for females 7.20 cm total length and 5.70 g total weight and 7.00 cm and 5.10 g in males. Female gonads were larger than those of males. In both sexes, the left gonads were slightly larger than the right ones. Based on macroscopic examination of gonads, six stages of gonad maturation were established in both sexes. Multiple spawning was confirmed for the species, with the peak spawning period between July and September in River Rima.
  B.A. Shinkafi , J.K. Ipinjolu and W.A. Hassan
  The aim of this study was to gain knowledge on the gonad morphology and to determine the stages of gonad maturation in Auchenoglanis occidentalis (Cuvier and Valenciennes), based on macroscopic and histological procedures. A total of 800 samples, of which 398 were females, 399 males and 3 with unidentified sex were examined between November 2005 and December 2008. The samples ranged in total length from 6.60 to 33.00 cm with a mean of 19.51±4.50SD and from 2.26 to 462.90 g total weight with a mean of 100.05±70.09 SD. In females, mean ovary weight was 2.74±0.23 SE, mean left ovary length 3.70±0.08 SE, mean left ovary width 0.59±0.03 SE, mean right ovary length 3.65±0.08 SE and mean right ovary width 0.57±0.02 SE. In males, mean testis weight was 0.17±0.03 SE, mean left testis length 2.75±0.06 SE, mean left testis width 0.20±0.01 SE, mean right testis length 2.74±0.06 SE and mean testis width 0.19±0.01SE. This shows that in both sexes, the left gonads were slightly larger than the right ones. Six stages of gonad maturation were established for the females and males namely, immature (I), maturing (II), mature (III), ripe and running (IV), spent (V) and resting (VI). Based on macroscopy, eggs of various sizes and colours were found in each ovary, while histologically, various stages of oocytes and spermatocytes developed in each ovary and testis, respectively, indicating multiple spawning in both sexes. Spawning of the species occurs during the peak of rainy season in River Rima, which is between July and September.
  J.K. Ipinjolu , I. Magawata and B.A. Shinkafi
  Climate change have significant impacts on Nigeria’s freshwater and marine aquatic systems and hence on the country’s fisheries and aquaculture. Fisheries and aquaculture are highly vulnerable to changes in weather pattern and the impacts which could be negative or positive, vary from the coastal areas to the drier northern parts of the country. Elevated water temperatures affect fish physiological processes, thereby affecting spawning, survival of the juveniles, recruit into the exploitable phase of population, population size, production and yield. The impacts of increased flooding of the freshwater bodies will be negative through erosion of watershed, destruction of fish feeding and breeding habitats, decrease in primary productivity and alteration of the normal resilience of the aquatic systems, or positive in expansion of aquatic habitats for primary and fish productions especially during the dry season. Drought exacerbate draw down of the lakes and reservoirs and insufficient flow in the river basins for spawning and primary production thereby affecting fish production. Rise in the water level of the Atlantic ocean lead to intrusion of more salty water into the river delta areas and inundation of the coastal low-lying areas, thus affecting distribution of both the freshwater and marine fishes as a result of changes in the physical and chemical properties of the waters. The impacts ultimately affect fish population, production and supply, thereby affecting the livelihoods of over 26 million people engaged in the primary and secondary sectors of the fisheries industry, as well as food security of the country. The adaptation and mitigation strategies are based on the peculiar characteristics and interactions of fisheries and aquaculture within the framework of feasible policy instruments. Strategies and policy measures need to be evolved to combat the observable and projected impacts of climate change on fisheries and aquaculture in order to protect the livelihoods of the fishing communities and food security.
  B.A. Shinkafi and J.K. Ipinjolu
  This study was carried out on Auchenoglanis occidentalis (Cuvier and Valenciennes) from River Rima, North-Western Nigeria to provide information on morphometric relationships and relative condition factor. A total of 800 samples of A. occidentalis of which 398 were females and 399 males (giving a ratio of about 1:1) were examined between November 2005 and December 2008. Biometric data such as Total Length (TL) and Total Weight (TW) measurements were recorded in the laboratory. The samples ranged in total length from 6.60-33.00 cm with a mean of 19.51±4.50 SD and from 2.26-462.90 g total weight with a mean of 100.05±70.09 SD. For the length-length relationships, the b values were 0.814 for TL-SL; 0.242 for TL-HL; 0.200 for GTH-TL and 0.779 for HL-GTH, suggesting negative allometry or faster increase in Total Length (TL) than in all the other length parameters. The species exhibited isometric growth pattern in the overall samples (b = 3.023), females (3.001), males (3.002), dry season samples (2.969) and those ≥15 cm (3.030). Samples <15 cm exhibited negative allometry (2.851) while those caught during rainy season exhibited positive allometry (b = 3.113). The species were found to be in good condition with an overall Kn value of 2.27±0.08 SD in females and 2.26±0.08 SD in males in the river. In both sexes, samples ≥15 cm were in significantly (p<0.05) in better condition than those <15 cm and likewise, samples in the rainy season had higher (p<0.05) Kn values than those in the dry season. Based on gonad maturation stages, samples in the mature, ripe and running, spent and resting stages were in significantly (p<0.05) better condition than those in the maturing and immature stages.
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