한국수산과학회

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  • pISSN : 2234-8395
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  • eISSN : 2234-1757

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kfas, vol. 53, no. 1, pp.50-56, February, 2020
DOI. https://doi.org/10.5657/KFAS.2020.0050

Estimating Length at Sexual Maturity of the Small Yellow Croaker
Larimichthys polyactis in the Yellow Sea of Korea Using Visual and GSI
Methods
한국 서해 참조기(Larimichthys polyactis)의 육안판별법과 GSI판별법에
의한 성숙체장 추정

강희중*·마지영·김현지·김한주
국립수산과학원 연근해자원과

Determination of the precise size at sexual maturity is very important for science-based stock assessment and fisheries
resource management. In this study, two different models, (1) a visual method and (2) a gonadosomatic index
(GSI) method, were employed to estimate length at sexual maturity of the small yellow croaker Larimichthys polyactis
in the Yellow Sea of Korea. The visual method is a common qualitative method using visual gonadal identification.
Conversely, the GSI method is a quantitative method using the GSI, which can be easily and precisely collected. We
compared results from these methods to determine the best approach, and to examine the practicality of the GSI method.
Logistic regression of the maturity ogive was conducted using a general linear model (GLM) with the R statistics
program. Also, the bootstrapped 95% confidence intervals of all estimates were calculated. The best-fit model was
the visual method (RMc
2 =0.805, AUC=0.989, L50=15.1). Among models using the GSI method, the model computing
GSIref=0.94 was the best-fit model (RMc
2 =0.792, AUC=0.989, L50=15.2). There was no significant difference between
the two models, evidencing the effectiveness and accuracy of the GSI method.

Keyword : Small yellow croaker, Maturation, GSI, length-weight relationship, Size at first maturity

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