New Zealand Journal of Marine and Freshwater Research abstracts

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Factors affecting settlement and early post-settlement survival of the New Zealand abalone Haliotis australis

GRAEME A. MOSS

National Institute of Water & Atmospheric
 Research Ltd
P. O. Box 14 901
Wellington, New Zealand
email: g.moss@niwa.cri.nz

Abstract  This paper describes studies on the settlement of the abalone Haliotis australis Gmelin. Ten-day-old H. australis larvae had a slower rate of settlement than 5-day-old larvae. A high proportion of veliger larvae had the ability to prolong the searching phase of settlement and delay metamorphosis, even over prepared settlement surfaces but radula development continued at a similar rate in both settled and swimming larvae. In any one batch of larvae settlement was slow and asynchronous and post-settlement survival was low. Light was shown to influence the swimming behaviour of larvae in settlement tanks, with more larvae swimming in the dark than in the light. The implications of these behaviours are discussed in relation to larval and post-larval energetics and feeding.

Keywords  Haliotis australis; feeding; settlement; survival

M98052
Received 3 August 1998; accepted 15 January 1999

PDF file of entire paper: medium quality (699K); (scanned from paper original: notes about this process)

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