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First data on age and sexual maturity of the Tristan klipfish, Bovichtus diacanthus (Bovichtidae) from Tristan da Cunha, South Atlantic

Published online by Cambridge University Press:  17 October 2011

Mario La Mesa  and
Joseph T. Eastman
Mario La Mesa*
Affiliation:
CNR-Consiglio Nazionale delle Ricerche, ISMAR Istituto di Scienze Marine, sede di Ancona, Largo Fiera della Pesca, 60125, Ancona, Italy
Joseph T. Eastman
Affiliation:
Department of Biomedical Sciences, College of Osteopathic Medicine, Ohio University, Athens, OH 45701-2979, USA
*
[email protected]
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Abstract

The Tristan klipfish, Bovichtus diacanthus, an endemic species at Tristan da Cunha Island was successfully aged using whole sagittal otoliths. The annulation pattern was clear, resulting in an alternating combination of opaque and translucent zones that form an annulus. Although sampling limitations did not allow direct validation of annual ring deposition, most otoliths showed a translucent edge, perhaps suggesting that the deposition of translucent zones is a synchronous process which takes place in winter coincident with the spawning season. The reliability of ageing methodology was supported by the good agreement between readings. The maximum age was estimated to be five years in females and four years in males. In order to increase the small number of direct readings, the length at age was back-calculated for each fish by fitting growth curves. The resulting growth of B.diacanthus was described by the von Bertalanffy growth model, as summarized by the following parameters: L∞ = 207.1 mm TL, k = 0.49 per year, and t0 = 0.04 years. The size at which 50% of the population spawns for the first time was c. 147 mm, corresponding to 2.5 years of age.

Keywords

bovichtidgrowth ratelife spannotothenioidsSouthern Ocean
Type
Biological Sciences
Information
Antarctic Science , Volume 24 , Issue 2 , 28 February 2012 , pp. 115 - 120
Copyright
Copyright © Antarctic Science Ltd 2011

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