Euphausiids of cook strait: A transitional fauna?

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Abstract
Between May 1968 and April 1970 a survey was made of the distribution, vertical range, and seasonal occurrence of euphausiids in Cook Strait. The euphausiid fauna reflects the predominantly subtropical origin of the coastal currents and, of the 11 species present, only Euphausia vallentini has pronounced subantarctic affinities. Nyctiphanes australis is the dominant species, with Euphausia lucens and Thysanoessa gregaria present in lesser numbers. New records included E. recurva, E. spinifera, and Stylocheiron elongatum, and the identity of Southland Current Nematoscelis euphausiids as N. megalops was confirmed. This assemblage of species, lacking a dominant subantarctic or subtropical element, may best be considered as representing a transitional fauna inhabiting a broad Subtropical Convergence Region.

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