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Reproduction in galaxias fasciatus salmoniformes galaxiidae



Reproduction in galaxias fasciatus salmoniformes galaxiidae



New Zealand Journal of Marine & Freshwater Research 13(2): 225-230



A study of the reproductive cycle was made on G. fasciatus Gray from streams on Banks Peninsula, South Island, New Zealand. There was no spawning migration; adults remained in the usual adult habitat to breed. The course of gonad maturation showed that spawning occurred in the autumn, from the end of April to mid-June. Most males matured at 2 yr of age and most females at 4 yr old. Egg numbers in the females varied from 3800-23,600. Males were predominant in age groups 1-4, females in the older age groups. Among fish of potential breeding age there was an excess of males. Circumstantial evidence suggested that eggs were laid among piles of water-logged debris lodged in pools and backwaters. The larvae, which are briefly described, probably hatch during floods to be swept quickly downstream to the sea.

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Accession: 006315696

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