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Articles by Olanrewaju Adewale Nurudeen
Total Records ( 2 ) for Olanrewaju Adewale Nurudeen
  Olanrewaju Adewale Nurudeen and Agbelege Ojo Olusegun
  Background and Objective: Sex ratio and allometry provide key information necessary for assessing reproductive potential and estimating stock size in fish populations. Sustainable management of dwindling commercially important fish stock in Nigerian inland water depend on adequate knowledge of the biological status of such fish species. Therefore, sex ratio and allometry of Synodontis melanoptera and Hydrocynus forskalii from Lake Alau, were investigated to enhance their production. Materials and Methods: A total of 512 fish samples comprising 252 S. melanoptera and 260 H. forskalii were randomly collected from fishers catch weekly for a period of 3 months. Length and weight were individually measured following standard procedure and sexes were separated after dissection. Length-weight relationship was estimated according to linear regression model W = aLb and condition factor determined using the equation K = 100.W/L3. Results: The mean length and weight for S. melanoptera and H. forskalii were 11.49±2.71 cm; 36.06±21.76 g and 11.91±3.53 cm; 29.52±15.44 g, respectively. The growth coefficient ‘b’ ranged from 2.802-3.177 for S. melanoptera and 2.230-2.707 for H. forskalii. While, the mean condition factors varied from 1.81±0.83-2.49±1.83 for S. melanoptera and 1.24±1.04-2.03±2.14 for H. forskalii. The sex ratio was 1:1.03 in S. melanoptera and 1:1 in H. forskalii, male:female, respectively. Conclusion: The growth of both species was allometric and the condition factors indicate a good state of well-being in the reservoir.
  Olanrewaju Adewale Nurudeen and Ajani Emmanuel Kolawole
  Background and Objective: Parachanna obscura is a member of African Channidae with great aquaculture potential in west Africa. The knowledge on chemical composition of P. obscura as food is very poor. Therefore, this study was carried out to determine the proximate composition and mineral contents of P. obscura from Eleyele reservoir, Nigeria. Materials and Methods: Three live samples of each sex (382.42±59.41 g) were collected monthly for one year. Samples were segregated according to sex and season and analyzed for proximate composition and mineral contents using AOAC and Atomic Absorption spectrophotometry methods. Data were analyzed using descriptive statistics and one-way ANOVA at α0.05. Results: The biochemical profile of P. obscura revealed high crude protein (23.19±1.06%), low fat (1.09±0.06%) and good level of carbohydrate (5.13±0.20%) and ether extract (7.00±0.26%). The results showed significant seasonal variation (p>0.05) in biochemical compositions but no marked variation (p<0.05) between sexes for all the samples examined. The highest proximate composition and mineral contents were recorded in wet season samples except for plasma ions (Na and K). Conclusion: The study showed that P. obscura has good nutritional contents with better nutritional value in wet season samples.
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