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Emigrating larvae of koaro, Galaxias brevipinnis Günther (Teleostei: Galaxiidae), from the Otira River, New Zealand

1995; Taylor & Francis; Volume: 29; Issue: 2 Linguagem: Inglês

10.1080/00288330.1995.9516660

1175-8805

R. M. McDowall, Alastair M. Suren,

Fish biology, ecology, and behavior

Abstract Fish larvae were collected in stream benthic invertebrate drift nets from the Otira River, near Arthur's Pass, New Zealand during a study of benthic drift. They are identified as probably those of koaro (Galaxias brevipinnis Gunther) on the basis of estimates of myomere counts (indicating Galaxiidae or Retropinnidae); by a process of elimination of likely species on the basis of distance up stream, elevation, and habitat characteristics; and by determining fish species in the Otira River tributaries upstream of the sampling location. This comprises the first likely record of emigrating larvae of koaro, a species known to be diadromous by the return migrations from the sea of whitebait juveniles during spring. A newly hatched larva of koaro is described and figured.