Growth characteristic of statolith of Todarodes pacificus in the East China Sea in the La Niña year

doi:10.13287/j.1001-9332.202406.028

Abstract

Abstract: To investigate the differences on morphological growth patterns of statolith of Todarodes pacificus in the East China Sea during La Niña and normal years, we analyzed the samples of T. pacificus collected in the East China Sea by Chinese light purse seine fishery fleets from February to April in 2020 (a normal year) and 2021 (a La Niña year). The results showed that total statolith length (TSL), lateral dome length (LDL), wing length (WL), and maximum width (MW) could be used as characterization parameters to representing the morphological growth of statolith. The characterization parameters of statolith in T. pacificus differed significantly between different climate years and between different genders. The values of those characterization parameters of statolith were greater in normal year than those in La Niña year, which in both years were larger in females, except for TSL in males in La Niña year. The statolith growth of males were faster than that of females in different climate years. TSL, LDL, and WL increased faster in normal year, while MW increased faster in La Niña year. The relative size of statolith gradually slowed down with the growth of individuals.

Key words: Todarodes pacificus, morphological characteristics of statolith, growth pattern, La Niña, the East China Sea

GUO Ruiyu, LU Huajie, SUN Tianzi, ZHAO Maolin, ZHANG Biqiang, YANG Sizhe. Growth characteristic of statolith of Todarodes pacificus in the East China Sea in the La Niña year[J]. Chinese Journal of Applied Ecology, 2024, 35(6): 1716-1724.

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