Effect of oxadiazon on Clarias Grariepinus: I incubation period and hatching success

  • Donald I. Osuigwe OSUIGWEDepartment of Fisheries Economics Michael Okpara University of Agriculture,Umudike, P.M.B 7267 Umuahia,Abia State, Nigeria

Abstract

The effect of oxadiazon, (a herbicide applied in irrigated paddy fields and fadama) on incubation period and hatching success of Clarias gariepinus was investigated. At the concentration of 1800ug/I applied under field conditions, the incubation period was not significantly affected (p>0.05) while the number eggs hatched were significantly depressed (p<0.05). However, with longer exposure, the percent number of eggs hatched increased but not to the level observed in the control (water). This may be attributed to gradual removal of the active components of oxadiazon from the water column. The presence of oxadiazon at concentration applied in the field therefore poses a potential threat to the recruitment of C. gariepinus in areas where it is applied. Keywords: Clarias gariepinus. eggs. hatching success, incubation period, oxadiazon.

[Niger Agric. J. 33 (2002): 136-138]
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eISSN: 0300-368X