[논문]동해 중부 연안에 출현하는 명태(Gadus chalcogrammus)의 산란기 및 성장패턴(allometric growth pattern)과 비만도(body condition) 변화에 영향을 미치는 요인

이충일; 한문희; 정해근; 박현제; 박주면

doi:10.35399/isk.31.3.3

동해 중부 연안에 출현하는 명태(Gadus chalcogrammus)의 산란기 및 성장패턴(allometric growth pattern)과 비만도(body condition) 변화에 영향을 미치는 요인
Spawning Season, and Factors Influencing Allometric Growth Pattern and Body Condition of Walleye Pollock Gadus chalcogrammus in the Middle East Sea, Korea 원문보기

Korean journal of Ichthyology = 한국어류학회지, v.31 no.3, 2019년, pp.141 - 149

이충일 (강릉원주대학교 해양자원육성학과) , 한문희 (강릉원주대학교 해양자원육성학과) , 정해근 (강릉원주대학교 해양자원육성학과) , 박현제 (강릉원주대학교 해양자원육성학과) , 박주면 (한국해양과학기술원 독도전문연구센터)

초록
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본 연구는 동해 중부 연안에 출현하는 명태(Gadus chalcogrammus)의 산란기, 체장-체중 관계(weight-length relationships, WLRs), 비만도(condition factor)를 조사하였다. 생식소숙도지수(gonadosomatic index, GSI))의 월변화를 통하여 추정한 명태의 산란기는 12월에서 3월이었다. 전반적인 체장-체중 관계식의 지수값 b는 2.806이었고, 2.778 (암컷)에서 2.980 (미성숙 그룹)의 범위를 나타냈다. b값은 암수 사이에서 유사하였으나, 미성숙 그룹과 비산란기 동안 성숙 그룹 또는 산란기 보다 유의하게 높은 값을 나타냈다. 비만도는 미성숙 그룹에서 성숙 그룹보다 유의하게 높았으나, 산란기와 비산란기, 암컷과 수컷 사이에서는 유의한 차이가 없었다.

Abstract ▼ AI-Helper

This study presents data on spawning season, weight-length relationships (WLRs) and condition factor of Gadus chalcogrammus inhabiting the middle East Sea, Korea. Monthly changes in the gonadosomatic index (GSI) revealed that the spawning period was from December to March. Overall value of the exponent b, estimated by nonlinear least squares from weight and length data was 2.806, ranging from 2.778 for female fishes to 2.985 for immature group. The b values were similar between spawning and non-spawning, and between female and male fishes, but it was significantly higher for immature than mature fishes. The condition factors were significantly higher for immature than mature groups, and during non-spawning than spawning periods, but it was not significant between male and female fishes.

주제어

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문제 정의

This study provides data on the spawning season, WLR parameters, and seasonal condition factors of G. chalcogrammus captured from the coastal waters of middle East Sea, Korea. These results contribute towards future conservation studies of the species, and be useful for fishery biologists and managers in Korea.

제안 방법

For each species, the weight-length function, BW= aTL^b, was fitted to the data using linear regressions of log₁₀-transformed data, where BW represents body weight (g), TL is total length (cm), and a and b are the intercept and allometric coefficient, respectively. Extreme outliers were removed before fitting the regression because the data were increased measurement errors (Froese et al.
chalcogrammus inhabiting Korean waters. This paper provides data of fisheries characteristics including spawning season, WLR parameters and condition factors for G. chalcogrammus inhabiting East Sea, Korea.

대상 데이터

Samples were collected along the shore lines within boxed area. The data of color depth contour were obtained from Korea Hydrographic and Oceanographic Agency (http://www.khoa.go.kr).

데이터처리

In the present study, the WLR parameters were summarized in each sex (female and male), season (spawning and non-spawning), maturity (immature and mature), and all specimens combined. Analyses of covariance (ANCOVA) was used to test the effect of the categorical factors of sex, season and maturity in the relationships between body weight and total length. The relationships between BW and TL, and interactions between categorical factors and covariates on these relationships were investigated by ANCOVA.
One-way analysis of variance (ANOVA) followed by Tukey’s post-hoc comparisons were used to assess whether there were significant differences of GSIs among months.
The assumptions of normality and homoscedasticity were met for the species(P>0.05); three-way analysis of variances (ANOVAs) was used to assess whether there were significant influences on condition factor by season, maturity and sex as well as their two-way and three-way interactions.
Analyses of covariance (ANCOVA) was used to test the effect of the categorical factors of sex, season and maturity in the relationships between body weight and total length. The relationships between BW and TL, and interactions between categorical factors and covariates on these relationships were investigated by ANCOVA.

성능/효과

In this study, the condition factors were significantly different between non-spawning and spawning, and between immature and mature fishes, but not between sexes. Because there were no significant interactions among those factors, variations of condition factor of this species were attributed to seasonal or ontogenetic changes in body condition in relation to spawning behavior and/or food intakes.
The mean values of condition factors were between 0.625 for immature G. chalcogrammus and 0.587 for mature G. chalcogrammus, showing significantly higher value for immature fishes (P<0.05).

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