New Zealand Journal of Marine and Freshwater Research abstracts

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Population dynamics and fishery management of the paua, Haliotis iris II. Dynamics and management as examined using a size class population model

K. J. SAINSBURY

Department of Zoology University of Canterbury Private Bag Christchurch, New Zealand

Abstract A population model is developed and used in conjunction with the results of a study of an unexploited population of paua (Haliotis iris Martyn) to examine the historical pattern of recruitment and yield per recruit. As H. iris cannot yet be aged, the population model uses size rather than age classes, but is structurally similar to the Leslie matrix model. Simulations suggest that the observed population size structure resulted from a short (about 5 year) period of high recruitment, preceded and followed by longer periods of low recruitment. Yield per recruit analysis shows that the present minimum legal size for the fishery (127 mm) provides close to the maximum yield per recruit for most stocks, although yield per recruit could be increased in some areas by a reduction in minimum legal size.

Keywords Haliotis iris; paua; marine molluscs; commercial species; population dynamics; stock assessment; population structure; mathematical models; simulation

New Zealand Journal of Marine and Freshwater Research, 1982, Vol. 16 : 163-173 Received 6 May 1980; accepted 26 March 1982

PDF file of entire paper: medium quality (700K); (scanned from paper original: notes about this process)

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