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Keywords = Okamejei kenojei

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12 pages, 3247 KiB  
Article
Age and Growth Characteristics of Okamejei kenojei in the West Sea of South Korea According to Coronal Vertebral Microstructure
by Byoung-Il Youn, Dong-Hyuk Choi, Tae-Hyoung Roh, Seung-Hwan Lee, Kyeong-Ho Han, Dae-Hyeon Kwon and Maeng-Jin Kim
Fishes 2023, 8(4), 197; https://doi.org/10.3390/fishes8040197 - 10 Apr 2023
Cited by 1 | Viewed by 2366
Abstract
In this study, the growth and age characteristics of Okamejei kenojei in the West Sea of South Korea were examined, and specimens were collected by bottom trawls from January to December 2019. The relationship between disc width (L) and body weight [...] Read more.
In this study, the growth and age characteristics of Okamejei kenojei in the West Sea of South Korea were examined, and specimens were collected by bottom trawls from January to December 2019. The relationship between disc width (L) and body weight (W) was W = 6.1 × 10−3 L3.40. Age was determined by measuring annuli on the vertebral centrum surface, which forms around June every year. The spawning period was extrapolated from monthly changes of the gonadosomatic index in June–July. The relationship between the vertebral centrum radius and disc width, which was analyzed separately for females and males, was determined as L = 16.159R0.6145 and L = 15.543R0.6851, respectively. Finally, O. kenojei growth, that is, the disc width (L) at a certain age (t), was expressed using the von Bertalanffy growth equation as Lt = 58.70(1 − e−0.21(t+0.12)) for females and Lt = 53.94(1 − e−0.26(t+0.05)) for males. This study provides basic data on the age characteristics of O. kenojei for future research and more efficient fish stock management. Full article
(This article belongs to the Section Biology and Ecology)
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11 pages, 3495 KiB  
Article
Spawning Period and Size at Maturity of the Ocellate Spot Skate Okamejei kenojei in the West Sea of Korea
by Byoung-Il Youn, Dong-Hyuk Choi, Seung-Hwan Lee, Kyeong-Ho Han, Seung-Jong Lee, Dae-Hyeon Kwon and Maeng-Jin Kim
J. Mar. Sci. Eng. 2022, 10(8), 1067; https://doi.org/10.3390/jmse10081067 - 3 Aug 2022
Cited by 3 | Viewed by 2212
Abstract
This study aimed to investigate the gonadal development process and size at maturity of the ocellate spot skate Okamejei kenojei (Müller and Henle, 1841). In total, 1234 specimens were collected from the center of the Korean West Sea between January 2019 and December [...] Read more.
This study aimed to investigate the gonadal development process and size at maturity of the ocellate spot skate Okamejei kenojei (Müller and Henle, 1841). In total, 1234 specimens were collected from the center of the Korean West Sea between January 2019 and December 2020. The maturity stage of the gonads of each individual was determined visually based on size, color, and egg size. To estimate the spawning period, each specimen was measured for disc width, body weight, and gonad weight, and the monthly gonadosomatic index (GSI) was derived. The GSI of the specimens peaked in April and May, and the main spawning period occurred during June and July. Egg capsules were first observed in specimens collected in March and were most commonly observed in specimens collected in July (56.8%). The maturity ogives for disc widths of female specimens at 50%, 75%, and 97.5% maturity were 26.6, 27.9, and 30.8 cm, respectively, whereas those of male specimens were 26.2, 27.5, and 30.7 cm. The findings of this study provide basic information on reproductive ecology related to the fertility of the ocellate spot skate. Full article
(This article belongs to the Section Marine Biology)
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