Age and growth of two endemic flatfish (Colistium guntheri and C. nudipinnis) in central New Zealand waters
D. W. Stevens A D , M. P. Francis A , P. C. Shearer A , R. P. McPhee B C , R. W. Hickman A and M. J. Tait AA National Institute of Water & Atmospheric Research Ltd, Private Bag 14901, Wellington, New Zealand.
B School of Biological Sciences, Victoria University of Wellington, PO Box 600, Wellington, New Zealand.
C Present address: 3 Irwell St, Island Bay, Wellington, New Zealand.
D Corresponding author. Email: d.stevens@niwa.co.nz
Marine and Freshwater Research 56(2) 143-151 https://doi.org/10.1071/MF04056
Submitted: 24 March 2004 Accepted: 21 February 2005 Published: 12 April 2005
Abstract
Brill (Colistium guntheri) and turbot (C. nudipinnis) were aged by counting opaque growth zones in whole and sectioned otoliths. Zones counts from whole otoliths under-estimated age compared with counts from thin otolith sections. Other species of flatfish that have previously been aged from whole otoliths should be re-examined for evidence of age under-estimation, which may be common in species with thick otoliths. Marginal analysis of thin sections supported the hypothesis that one translucent and one opaque zone are formed each year in brill aged 5–10-years old. Marginal analyses for brill greater than 10 years of age, and for turbot, were inconclusive. However, 2+ and 3+ captive-reared turbot deposited the expected number of opaque zones from hatching. Both species grow rapidly for the first three years of life before growth slows appreciably. Turbot grow faster and larger than brill, and females grow faster and larger than males in both species. Growth is minimal in fish older than five years. Maximum observed ages were 21 years for brill and 16 years for turbot.
Extra keywords: beach seine, brill, otoliths, turbot, von Bertalanffy growth model.
Acknowledgments
We thank Talleys Fisheries Ltd, Greymouth for providing the adult brill and turbot used in this study. Colin Sutton, Peter Horn, Mary Livingston, Neil Bagley and three anonymous referees provided constructive criticism on the manuscript. Caoimhghin Ó Maolagáin assisted with equipment. This research was funded by the New Zealand Ministry of Fisheries under project FLA2000/01.
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