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http://dx.doi.org/10.35399/ISK.33.2.3

A Study of Growth and Age Structure for Chub Mackerel, Scomber japonicus Caught by a Large Purse Seine in the Korean Waters  

Jung, Kyung-Mi (South Sea Fisheries Research Institute, National Institute of Fisheries Science)
Kim, Heeyong (South Sea Fisheries Research Institute, National Institute of Fisheries Science)
Kang, Sukyung (Fisheries Resources Management Division, National Institute of Fisheries Science)
Publication Information
Korean Journal of Ichthyology / v.33, no.2, 2021 , pp. 64-73 More about this Journal
Abstract
We examined the growth and age structure for chub mackerel caught by a large purseseine in the Korean waters from January to December 2015. A total of 459 specimens were used for otolith analysis, ranging from 19.6 cm to 46.0 cm in fork length. Translucent zone was regarded as an annual mark, and age was counted using the information of the number of translucent zone, capture date, edge type of the otolith and nominal birthdate of 1 January. Annuli in otoliths were mainly formed in May, coinciding with the spawning season. Estimated ages were 0~6 years, and the von Bertalanffy growth models were not significantly different between male and female. Sex-combined growth model was obtained as FLt=39.3×{1-exp[-0.90×(t+0.033)]}. Among the chub mackerel caught in 2015, the age 2 group had the highest proportion (30.9%), and the age 0 to 2 group accounted for 88.5% of the total catch.
Keywords
Chub mackerel; otolith; age determination; growth; age structure;
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