The 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 fertilisation, at temperatures of 20.2 - 29.0oC. The length of larvae at hatching varied from 3.44 - 4.15mm. The prolarval stage terminated approximately 61?2d after hatching at temperatures between 19.0 and 29.0°C, when the larvae measured 5.30 - 5.85mm in length. Opercular stripes appeared on juveniles between 12 and 20mm in length, and males and females were mature at 44.7 and 49.0mm respectively. Adult males often had a pronounced bulge on top of the head. The longest fish from the western population was 99.0mm. Fecundity varied from 284 to 1300 eggs. The gonosomatic index of females and males ranged from 1.26 - 11.74 and 0.18 - 2.16 respectively. The mean length of fish reared in an aquarium measured 33.0 and 50.0mm at one and two years old, respectively. Eggs, larvae, and breeding biology are compared with other Murray Darling species. The breeding biology of Mogurnda species in Australia is discussed which emphasises the taxonomic confusion.

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