
Broodstock, or broodfish, are a group of mature individuals used in aquaculture for breeding purposes. Broodstock can be a population of animals maintained in captivity as a source of replacement for, or enhancement of, seed and fry numbers. These are generally kept in ponds or tanks in which environmental conditions such as photoperiod, temperatu...
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http://en.wikipedia.org/wiki/Broodstock

a fish, which is kept for the purpose of reproduction and supply of juveniles.
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http://www.encyclo.co.uk/local/20740

A fish which is kept for the purpose of reproduction and supply of juveniles.
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https://www.sustainweb.org/goodcatch/glossary_of_seafood_terms/
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