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Length-frequency data for tuna baitfish (Encrasicholina heterolobus and Spratelloides delicatulus) and the cardinalfish Apogon rueppellii; guidelines for employing computer packages to use length-frequency data to analyse age composition and growth of fish populations

Wide, B.S. and Potter, I.C. (1994) Length-frequency data for tuna baitfish (Encrasicholina heterolobus and Spratelloides delicatulus) and the cardinalfish Apogon rueppellii; guidelines for employing computer packages to use length-frequency data to analyse age composition and growth of fish populations. In: Blaber, S.J.M., Milton, D.A. and Rawlinson, N.J.F., (eds.) Tuna baitfish in Fiji and Solomon Islands : proceedings of a workshop, Nadi, Fiji 17-18 August 1993: ACIAR proceedings no. 52. ACIAR, Canberra, Australia, pp. 117-130.

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Abstract

The present paper demonstrates that length-frequency data collected for E. heterolobus and S. delicatulus are inappropriate for analysis by computer packages. The reasons for this inappropriateness are discussed. The length-frequency data collected for Apogon rueppellii, which show conspicuous and consistent modes in sequential monthly samples (Chrystal et al. 1985), have been analysed using MIX, ELEFAN and MULTIFAN to illustrate the type of data that is required to use these packages. Apogon rueppellii was also chosen because, like the above tuna baitfish, it occurs in the Indo-Pacific region (Allen and Cross 1989) and has a relatively short life cycle (c.f. Chrystal et al. 1985, Milton and Blaber 1991). The results obtained with A. rueppellii highlight the essential requirements of length-frequency data for use in age and growth studies, and emphasise the importance of selecting an appropriate sampling regime and considering the possibility that growth may be seasonal and vary with sex. Finally, guidelines are given for the requirements that should be met to produce and analyse length-frequency data by computer packages.

Publication Type: Book Chapter
Murdoch Affiliation: School of Biological and Environmental Sciences
Publisher: ACIAR
Copyright: © Australian Centre for International Agricultural Research
URI: http://researchrepository.murdoch.edu.au/id/eprint/19647
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