Abstract
The effect of formalin on the hatching rate of eggs of the African catfish and subsequent survival of the larvae were investigated using range finding and definitive tests to determine the impact of formalin for 15 minutes. In the range finding test, 0mgl-1 (control), 250mgl-1, 500 mgl-1, 750 mgl-1, and 1000 mgl-1 of formalin were used to define the threshold limit of tolerance of eggs to formalin. There were significant differences in the hatching rate and survival of early larvae between the control and all four formalin concentrations (p
Highlights
Aquatic fungi (Saprolegniales) are ubiquitous in natural water supplies of fish hatcheries often causing serious disease problem
Malachite green is effective in control of fungus on fish and fish eggs, but due to suspected teratogenicity, that is potential carcinogenicity (Meyer and Jorgenson 1984, Fitzpatrick et al, 1995) and / or mutagenic properties (Marking et al, 1994), its use was limited to the treatment of non-food fish
The result of the range finding test showed that hatching rate was between 65% and 69% with mean hatching rate of 65.3+3.51% in the control, which was significantly different from 250 mg-l concentration of formalin-treated eggs (p
Summary
Aquatic fungi (Saprolegniales) are ubiquitous in natural water supplies of fish hatcheries often causing serious disease problem. High concentrations of formalin are used to control fungi on fish eggs.
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