Claudine Tekounegning Tiogué1, Paul Zango2, Thomas Ewouken Efolé1, Madeleine Kenfack1, Joseph Tekwombuo1, Guegang Tekou2, Mathieu Domwa1, Minette Tabi Eyango Tomediand Joseph Tchoumboué1

1Faculty of Agronomy and Agricultural Sciences, Department of Animal productions, Laboratory of Applied Ichthyology and Hydrobiology, The University of Dschang,
P.O.Box 222, Dschang, Cameroon.
2Institute of Fisheries and Aquatic Sciences at Yabassi, The University of Douala, P.O.Box 2701, Douala, Cameroon.

Published 6th September 2014 SCIENCEDOMAIN international


Authors’ contributions
This work was carried out in collaboration between all authors. Author CTT wrote the protocol, performed the statistical analysis and wrote the first draft of the manuscript.
Authors MD, GT and PZ have collected and collated data. Authors MK, TEE and JT have read the manuscript. Authors MTET and JT managed the literature searches. All authors read and approved the final manuscript.

INTRODUCTION
The domestication of new species of fish aquaculture inherent diversification is a recurring issue [1]. All cultured aquatic species have been domesticated since the early twentieth century [2]. These diversification of species produced corresponds to situations and varied objectives, including: the need to cover traditional markets (niche market) for which demand is not satisfied, using species with very high growth potential in order to reduce production costs and the risks associated with cycle times rearing [3], as well as the necessity to eliminate the use of the wild fingerlings for domestication purposes [4]. This control of the life cycle of a species requires its bio-ecological study (natural habitat) [5]. Bio-ecological studies have been carried out on many aquatic species in the world’s water bodies [6-9]. In Africa, the ichthyofauna of many rivers has already been studied [10-17]. In Cameroon, to our knowledge, apart from some morphological characteristics of African carp Labeobarbus batesii [18,19], data on the bio-ecology for fish species from water bodies is still lacking. This lack of knowledge on the Cameroonian species has been largely responsible for the introduction into the country of alien species like the common carp (Cyprinus carpio), African catfishes (Heterobranchus longifilis and Clarias gariepinus), and Tilapia (Oreochromis niloticus) whose breeding cycles were controlled [20-24]. This practice has an immediate production without having to undertake research on native species still unknown, both the biological point of view as that of their aquaculture potential. Mbô Floodplain (MF) has many important rivers whose fisheries resources play a significant role in the economy and nutritional status of the local populations. This area is devoid of commercial exploitation due to local enforcement of traditional fishing regulations [25]. There is a little knowledge about the biology of most of the species captured. It is therefore important to understand the basic features of the demography of these fishes for future research. As a first approach to the study on the biology of native fish species in the Mbô Floodplain, this study estimates the monthly frequency occurrence in the captures, sex-ratio, length-weight relationship, and the condition factor K of fish species.

ABSTRACT
Aims: To evaluate the aquaculture potential of the native fishes from the Mbô Floodplain (MF) Rivers for their domestication and preservation the genetic diversity.
Study Design: Descriptive research. Place and Duration of Study: Laboratory of Applied Ichthyology and Hydrobiology, Department of Animal Productions, Faculty of Agronomy and Agricultural Sciences, the University of Dschang-Cameroon, between October 2008 and October 2009.
Methodology: A total of 449 fishes measured 11.50 to 50.50cm (mean: 24.60±5.70 SDcm) total length (TL) and 8 to 1300g (mean: 169.18±111.01 SDg) total weight (W), were used for the analysis. Taxonomic identification was performed. The TL and the W were measured using an ichtyometer and electronic balance respectively. The sex of the fish was determined by macroscopic examination of genital papilla or the gonads after dissection. Fishes were counted by species, sexes and months. For data analysis, descriptive statistics, Chi-square test, t-test, general linear model, and the statistical significance of r2 were performed using SPSS 20.0 software at 5% and 1% significance levels.
Results: Four families with four species were determined: Clariidae (Clarias jaensis), Cyprinidae (Labeo camerunensis and Labeobarbus batesii), Cichlidae (Tilapia
camerunensis). All fish species were a higher size. The allometry coefficient b ranged from 2.01 (Labeo camerunensis) to 3.12 (C. jaensis) (mean=2.58±0.50 SD). All species
sampled have more females than males indicate the number of both females and males for possible relative sex percentages. Fish species shows positive and negative allometric growth. The higher K factor was recorded in the Cichlidae family and the lower in Clariidae. However the majority of fish species showed a good well-being.
Conclusion: All fish species show a positive aquaculture potential. Then they could be domesticated and preserved genetic diversity. This study, however, need further work to validate reliability.

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