Abundance, length – weight relationships and Fulton’s condition factor of the freshwater cichlid Sarotherodon galilaeus (Pisces: Teleostei: Perciformes) from a sand-dragged man-made lake of Southern Benin, West Africa
Journal Title: Journal of Biodiversity and Environmental Sciences (JBES) - Year 2016, Vol 8, Issue 4
Abstract
Condition factors and growth trends indices such as allometry coefficients are decisive fisheries management tools that evaluate the well-being of fishes, their establishment and the quality of their habitat. We investigated the condition factors and length-weight relationships of a freshwater tilapine cichlid, Sarotherodon galilaeus, that has naturally colonized the artificial lake of Ahozon (South-Benin). S. galilaeus individuals has been sampled every month in the “aquatic vegetation” and in the “open water” habitats with seines, cast nets, gill nets and hooks. This species dominated Lake Ahozon and made about 85.21% of the fish community. Fish sizes showed significant spatial (F1,5548=57106.9, p=0.0001) and seasonal (F2,5547=82,06, p=0.0001) variations and smaller sizes (18.65±5.76mm-SL) were recorded in the “aquatic vegetation” considered as the spawning ground for S. galilaeus. In Lake Ahozon, length-weight regression equations gave slopes b ranging between 2.636 and 3.081 indicating that S. galilaeus exhibited both allometric and isometric growth. Also, the species exhibited spatial (F1,5548=94.510, p=0.0001), seasonal (F2,5547=7.163, p=0.001), ontogenetic (F2,5547=63.591, p=0.0001) and sexual (F1,3781=8.275, p=0.001) variations of condition factors (K) that mostly depend on the availability of food resources. The prominence of the species and its condition factors indicated that S. galilaeus is well- establishment in Lake Ahozon. The improvement of growth performance and well-being for a sustainable fisheries/aquaculture in Lake Ahozon require the protection of the foraging and spawning grounds, the prevention against organic and chemical pollution, the introduction of predators to prevent overpopulation of S. galilaeus, the fertilization of the lake and a planned harvest of the fish stock.
Authors and Affiliations
Houehanou M. A. G. Gbaguidi, Alphonse Adite
Keywords
Related Articles
- EP ID EP38806
- DOI -
- Views 167
- Downloads 0
Temporo-spatial distribution of ground dwelling spider genera among fodder crops at Okara district, Pakistan
The present study was designed to record the temporo-spatial distribution of ground dwelling spider genera among fodder crops at Okara district. Sampling was made from berseem and mustard crops on fortnight basis through...
Effect of thiamine on blood glucose changes after maximal aerobic exercise in non-athlete university students male
This study is conducted with the aim of investigating the effect of vitamin B1 (Thiamine) on blood glucose changes. We observed that when the subjects received 300 mg thiamin /day, there was a lowering of blood glucose...
The effect of resistance training on level of Leptin hormone in overweight females
Obesity is associated with adverse changes in metabolic and cardiovascular risk factors, including high blood pressure, dyslipidemia, and insulin resistance, thereby leading to an increased risk of morbidity and mortali...
Analysis of land use/land cover changes in the Debre-Mewi watershed at the upper catchment of the Blue Nile Basin, Northwest Ethiopia
Changes in land use/cover at the Debre-Mewi Watershed in northwest Ethiopia were analyzed over a period of 51 years (1957-2008). The changes were measured through interpretation of aerial photos taken in 1957 and 1982,...
Evaluate the impact of strength parameters on soil bearing capacity
In this study, the role and effect of soil resistance including soil cohesion strength, internal friction angle and modulus of soil deformation have been investigated. In order to execute large structures on earth mater...