Abstract
Fluctuating asymmetry (FA), often used as indicator of environmental stress, was evaluated in gill rakers and filaments of Labeo ogunensis from Ogun river, Southwest Nigeria. Mean length and weight of 13.68 +/- 1.28 cm and 59.40+17.48 g were respectively recorded. The gill rakers (t = -0.919) and filaments (t = -1.150) from both sides were not significantly different. The gill filaments recorded (0.31 +/- 2.42) higher incidence of fluctuating asymmetry (FA) compared with the gill rakers (0.21 +/- 1.58), signifying developmental interference in the population. Fish size and sex were observed to exert minimal influence on FA.
Highlights
Fluctuating asymmetry (FA), the most widely used measure of developmental stability, is the random departure from perfect bilateral symmetry
The summary of weight, length, gill meristics for indivdual sexes and the total in L. ogunensis is shown on Table 1
There were no significant differences between right and left gill rakers or filaments
Summary
Fluctuating asymmetry (FA), the most widely used measure of developmental stability, is the random departure from perfect bilateral symmetry This deviation results either from genetic or environmental stress (Van Valen 1962, Palmer and Strobeck 1986, Graham et al 1993). FA has a prime attribute of indicating environmental stress at early stages or sub-analytical concentrations, before manifesting at community or ecosystem levels due to incorporation of homeostasis (Graham et al 1993). This was perhaps responsible for its been highly recommended for ecosystem monitoring (GESAMP 1980). This paper seeks to provide information on FA in gills small sample of Labeo ogunensis (Boulenger) as indicator of environmental stress
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