Fisheries And Hydrobiology
Associate Professor / Reader
At the Fisheries department office
Appointment on Visitation important
Topic: Population And Growth Dynamics Of Parachanna Obscura From Owo River Off Ologe Lagoon, South West Nigeria.
Description: The growth fitting a curve to length at age for fish using Solver functions of Microsoft Excel, which involves a computer-based search for the optimal parameter values that minimize the sum of the square differences (or residual errors) between the observed data and the expected values was used in this study. The measure of fit, called least of squares, and the Solver function in Microsoft Excel was used in completing a direct search for the minimum sum of squared residuals (SSR) and the corresponding parameters. (King,1995). A scatter-plot of body weight against total length for male, female and both sexes of specimens of P. obscura were calculatedThe relationship between body weight and body length for the fish species is described by the equation w = alb. The result for P. obscura shows that the species exhibited positive allometry. Also, The von Bertalanffy growth parameters obtained from the Ford-Walford plot and growth curve using the parameters estimated by non-linear least squares give K values to be 0.28 yr-1, 0.22 yr-1 and 0.30 yr-1 for male, female and combined sexes while the length at infinity (L?) for male, female and combined sexes are 45.05 cm, 43.05 cm and 45.05 cm respectively. This shows that the male specimens have faster growth rate than the females.
|1.||Ph.D (Fisheries and Hydrobiology)||University of Ibadan||2010|
Mapping and Evaluation of Woods in Fish Smoking and Analysis of Chemical Hazard in Smoked Fish in Nigeria
Aims ad Objectives: 1. to verify different species and types of fuel woods used for smoking in Nigeria. 2. To determine the concentrations and chemical hazards in fuel woods. 3. To evaluate hazards consumers face in consumption of smoked fish. 4. To study the health hazards by feeding experimental rats. Materials and Methods: 1. Collection of fuel woods from small-scale fish processing points and centres will be done. 2. PAH extraction will be carried out following Wretling et al (2010) while analysis will be carried out using gas chromatography system. 3. Dietary exposure to PAH will be calculated using USEPA (1991). 4. Experimental rats will be exposed to different feeds inclusion of smoked fish with high - level of PAH concentration. Expected result. 1. The research output is expected to provide a profile of both conventional and unconventional fuel wood used for fish smoking in Nigeria. 2. It is also expected to reveal the concentrations of PAH types and levels in fuel woods and smoked fish. The dietary exposure will reveal the risk exposure over a period of time in which the smoked fish were consumed. 4. The specific impact of the human organs to develop cancer cell over a period of consuming the smoked fish product with the high level of PAH will be determined. Contribution to knowledge. This research will be a valuable addition to knowledge and influence policy on fuelwood for fish smoking, dietary choices and general health policy. References. Wrestling, S., A. Eriksson, G.A. Eskhult and B. Larsson (2010). Polycyclic aromatic hydrocarbons (PAHs) in Swedish smoked meat and fish. Journalof Food composition and Analysis 23: 264-272. USEPA. 1991. Guidelines for Developmental Toxicity Risk Assessment. EPA/600/FR91/001.
WHENU OLUSEGUN is a Associate Professor / Reader at the Department of Fisheries
WHENU has a Ph.D in Fisheries and Hydrobiology from University of Ibadan