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Age and growth of the Japanese butterfish Psenopsis anomala in the waters off north-eastern Taiwan

Published online by Cambridge University Press:  21 April 2020

Shyh-Bin Wang*
Affiliation:
Institute of Marine Affairs and Resource Management, National Taiwan Ocean University, No. 2, Pei-Ning Rd, Keelung, Taiwan
Li-Yu Hung
Affiliation:
Department of Environmental Biology and Fisheries, National Taiwan Ocean University, No. 2, Pei-Ning Rd, Keelung, Taiwan
Kwang-Ming Liu
Affiliation:
Institute of Marine Affairs and Resource Management, National Taiwan Ocean University, No. 2, Pei-Ning Rd, Keelung, Taiwan George Chen Shark Research Center, National Taiwan Ocean University, No. 2, Pei-Ning Rd, Keelung, Taiwan
*
Author for correspondence: Shyh-Bin Wang, E-mail: sbwang@mail.ntou.edu.tw

Abstract

The catch of Japanese butterfish, Psenopsis anomala in Taiwan is greater than those of any other nation; however, the biology, particularly the age and growth, of this economically important fish species is little known. This study describes the age and growth of P. anomala based on 734 specimens (340 females, 363 males, 31 unsexed) caught by trawl fishery in the north-eastern waters off Taiwan from March 2007 to July 2008. The age of specimens was estimated by counting the growth annuli in sagittal otoliths. The periodicity of annulus deposition on otolith was estimated to be one year with opaque zone deposited between July and August based on marginal increment analysis. The maximum age for both sexes was estimated to be ~4. The female portion of the population was dominated by the 3+ age class, while the male portion was dominated by the 2∞ age class. The parameters of the von Bertalanffy growth function with standard error estimated based on the observed length at age using a non-linear method are as follows: L = 25.47 ± 0.65 cm, k = 0.30 ± 0.03 year−1, and t0 = −1.84 ± 0.16 year for females (n = 350), and L = 22.39 ± 0.45 cm, k = 0.46 ± 0.04 year−1, and t0 = −1.38 ± 0.13 year for males (n = 378). The growth performances of P. anomala reported from different geographic regions were compared, and the potential influences of sample size distribution on the estimated growth parameters were further discussed.

Information

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2020

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