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Looking for a Haliotis rubra shell morphometric signature: contrasting geographic and age contributions to variation in shell morphometry

Citation

Mundy, CN and Lyall, L, Looking for a Haliotis rubra shell morphometric signature: contrasting geographic and age contributions to variation in shell morphometry, 8th International Abalone Symposium, 6-11 May 2012, Hobart, Australia (2012) [Conference Extract]

Abstract

The shape of blacklip abalone Haliotis rubra shell is proposed to vary as a function of the quality of the environment in which an individual resides. The term ‘stunted’ is commonly applied to abalone from locations where growth is slower, and with smaller maximum size in comparison to other locations within a given fishery. It is hypothesised that in these slower growth areas, the shell shape is also divergent, with more rounded and taller shapes common place. The spatial variation in growth of H. rubra around Tasmanian is reasonably well understood. However, variation in shell shape is less well linked to geographic location, and is more commonly attributed to change in shell shape due to abalone age. For example as growth slows to a few mm/year, natural erosion of the shell edge combined with biofouling from sponges and polychaetes, and natural the continual laying down of nacreous layers, appears to alter the shape of abalone shells as they age. Here, we investigate geographic and age morphometric signature using univariate and multivariate techniques, and identify length based shape change parameters as a performance measure for the established Minimum Legal Size.

Item Details

Item Type:Conference Extract
Keywords:abalone, morphometrics, allometry, shell shape, multivariate morphometrics
Research Division:Agricultural and Veterinary Sciences
Research Group:Fisheries Sciences
Research Field:Fisheries Management
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - Wild Caught
Objective Field:Wild Caught Edible Molluscs
Author:Mundy, CN (Dr Craig Mundy)
Author:Lyall, L (Mrs Luisa Forbes)
ID Code:101845
Year Published:2012
Deposited By:IMAS Research and Education Centre
Deposited On:2015-07-13
Last Modified:2015-07-16
Downloads:0

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