ABSTRACT
Reproduction of the pupfish, Cyprinpodon neradensis is very much inhibited when the pH is lowered from the normal habitat level of 8.3. Egg production was reduced by 50% at pH 7.0. Food availability is closely related to maturation and build up of gonads of finfishes. A reduction in the availability has been found to result in regression of gonads in Gillichthys mirabilis (de Vlaming, 1971). Decrease in food supply has inhibited gonad development in Salmo gairdneri and Salmo trutta (Bagenal, 1969). Improved feeding accelerated the maturation time of gonads in a year in the flounder, Pleuronectes limanda and the herring Clupea hapengus (Woodhead, 1960). In the temperate golden perch, Plectoplites ambiquus of Australia, the yolk-laden oocytes do not become mature if there are no floods (Mackay, 1973).
