Females typically brood around 60 young, but large individuals may carry 300 or more (McDowall 2000).The gestation period has been experimentally determined to average around 24 days, a timeframe that is in close agreement with field observations of pond-raised animals (Krumholz 1948). Most fry in the experimental investigation had absorbed the maternal yolk before being liberated, but some broods contained animals that had not completely absorbed the yolk sacs.
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