Breeding and development of the endangered Purple-spotted Gudgeon Mogurnda adspersa population from the Murray Darling
2006; Royal Zoological Society of New South Wales; Volume: 33; Issue: 4 Linguagem: Inglês
10.7882/az.2006.021
ISSN2204-2105
Autores Tópico(s)Fish biology, ecology, and behavior
ResumoThe Purple-spotted Gudgeon, Mogurnda adspersa, is widespread occurring in coastal drainages in northern NSW and Queensland, and an endangered western population in the Murray Darling System. This paper reports a study at the Inland Fisheries Research Station, Narrandera in the 1960s using fish from the western population. M. adspersa bred in ponds and aquaria at temperatures between 20.0 and 29.9oC (34.0oC at water surface), and in ponds between December and February. An abundant food supply was essential but rising water levels were not required. The elaborate spawning behaviour and embryological development of the eggs, larvae and juvenile fish were recorded. The eggs were demersal, transparent, telolecithal and elliptical, and they possessed an adhesive disc at one of the pointed ends, although the chorion was essentially non-adhesive. They measured 1.07 - 1.33mm by 2.03 - 3.78mm, and were attached in a cluster to solid objects. Their oil globules were small and numerous. The eggs hatched 3 – 8d after ...
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