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http://dx.doi.org/10.5657/KFAS.2020.0019

Maturity and Spawning of Pacific Sand Eels Ammodytes japonicus in Coastal Waters near Donghae, Gangwon-do  

Kim, So Ra (Coastal Water Fisheries Resources Research Division, National Institute of Fisheries Science)
Kim, Jong Bin (Fisheries Resources and Environment Research Division, East Sea Fisheries Research Institute, National Institute of Fisheries Science)
Lee, Soo Jeong (Fisheries Resources and Environment Research Division, East Sea Fisheries Research Institute, National Institute of Fisheries Science)
Yang, Jae Hyeong (Fisheries Resources and Environment Research Division, East Sea Fisheries Research Institute, National Institute of Fisheries Science)
Publication Information
Korean Journal of Fisheries and Aquatic Sciences / v.53, no.1, 2020 , pp. 19-26 More about this Journal
Abstract
The maturity and spawning of pacific sand eels Ammodytes japonicus, was investigated using samples collected by gill net in coastal waters near Donghae, Gangwon-do, from January 2017 to December 2018. Monthly changes were analyzed in maturity stage, gonadosomatic index (GSI), egg diameter, fecundity (F), and total length (TL) at 50% group maturity. The average TLs of female and male A. japonicus were 18.5 and 18.1 cm, respectively. The spawning period was from November to March, with the peak from December to February based on monthly changes in GSI and maturity stages. The egg diameter during the spawning-capable stage was 300-1000 (main mode 500-600) ㎛. Fecundity ranged from 6,411 eggs at 16.7 cm fork length to 45,771 eggs at 24.7 cm fork length. The relationship between TL and F was F=0.00005TL4.2715 (R2=0.7216), such that F increased with TL. TL at 50% group maturity was estimated to be 15.1 cm for both sexes.
Keywords
Maturity; Spawning; Pacific sand eels; Sand lance; Ammodytes japonicus;
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