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* The presence of vegetation and an increase in temperature will usually work for goldfish. *
 
* The presence of vegetation and an increase in temperature will usually work for goldfish. *
 
* Changing the photoperiod in a hatchery can accelerate or delay maturation and ovulation in many salmon and trout species.
 
* Changing the photoperiod in a hatchery can accelerate or delay maturation and ovulation in many salmon and trout species.
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2. Inject the fish with one or more naturally occurring reproductive hormones or their synthetic analogues.
 
2. Inject the fish with one or more naturally occurring reproductive hormones or their synthetic analogues.
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