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Fish - Inducing Reproduction - Anatomy & Physiology (view source)
Revision as of 07:06, 30 July 2008
, 07:06, 30 July 2008→Strategies
= Strategies =
= Strategies =
There are two main strategies used to induce reproduction.
There are two main strategies used to induce reproduction. Often the two strategies are used sequentially, the first to manipulate maturation, then the second to induce ovulation.
* The second strategy is to inject the fish with one or more naturally occurring reproductive hormones or their synthetic analogues.
1. Provide an environment similar to that in which spawning occurs naturally.
* Catfish, for example, like to spawn in enclosed spaces such as hollow logs. A farmer can simulate this by putting milk cans in a pond.
* 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.
2. Inject the fish with one or more naturally occurring reproductive hormones or their synthetic analogues.
* This is only effective in fish that are already in breeding condition and have mature eggs in which the germinal vesicle has migrated.
* This is only effective in fish that are already in breeding condition and have mature eggs in which the germinal vesicle has migrated.
= Induction using Hormones =
= Induction using Hormones =