Geographical variations in genetic group composition, life-history traits, and statolith shape for Sepioteuthis spp. in the Northwest Pacific
Tzu-Yun Ching A B , Naoki Yagishita B , Atsuko Yamaguchi B , Chia-Hui Wang A and Chih-Shin Chen C D *A Department of Environmental Biology and Fisheries Science, National Taiwan Ocean University, Keelung 20224, Taiwan.
B Graduate School of Fisheries and Environmental Science, Nagasaki University, Nagasaki 852-8521, Japan.
C Institute of Marine Affairs and Resource Management, National Taiwan Ocean University, Keelung 20224, Taiwan.
D Center of Excellence for the Oceans, National Taiwan Ocean University, Keelung 20224, Taiwan.
Marine and Freshwater Research 73(8) 995-1010 https://doi.org/10.1071/MF21323
Submitted: 10 November 2021 Accepted: 13 April 2022 Published: 23 May 2022
© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing
Abstract
Context: Sepioteuthis cf. lessoniana is widely distributed in the coastal waters of the Indo-Pacific region and is a crucial fisheries resource along its distributional range. At least four lineages of Sepioteuthis have been identified in the western Pacific region; however, their biological information remains unclear.
Aims: In this study, the genetic groups of Sepioteuthis spp. in the southwestern Japan and northern Taiwan was examined using molecular markers, and the life-history traits and statolith morphology of the genetic groups were investigated.
Methods: A total of 137 and 205 squid individuals from Japan and Taiwan, respectively, were examined.
Key results: Three genetic groups of Sepioteuthis (S. sp. 1, sp. 2, and sp. 2A) were identified based on molecular evidence in both areas, among which Sepioteuthis sp. 2 was dominant in Japan (87%), whereas Sepioteuthis sp. 1 was dominant in Taiwan (70%). For the same genetic group, the mantle length, average growth rate, and size and age at maturity were greater for the squid in Japan than those in Taiwan. The statolith exhibited a wider lateral dome and longer rostrum for the squid in Taiwan than those in Japan.
Conclusions: This study indicated the variations in the life-history traits and statolith shapes of the squid were greater between geographic populations (Japan and Taiwan) than among the genetic groups, which suggested that environmental effects on life-history traits and statolith shape of squid were greater than genetic effects.
Implications: The results of this study provide insights into the population structure of Sepioteuthis spp. in the Northwest Pacific region, which is relevant for the sustainable management of the squid fisheries.
Keywords: age at maturity, cytochrome oxidase c subunit I, elliptic Fourier analysis, Japan, population structure, Sepioteuthis cf. lessoniana, statolith morphology, Taiwan.
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