한국근해 참조기의 자원량 변동에 관한 연구 OTHER

Title
한국근해 참조기의 자원량 변동에 관한 연구
Alternative Title
A Study on Fluctuations in Biomass of Small Yellow Croaker, Pseudosciaena polyactis, off Korea
Author(s)
장창익; 김용문; 유신재; 김종관; 안순모
Publication Year
1992-01
Abstract
Annual biomasses of small yellow croaker, Pseudosciaena polyactis, were estimated by biomass-based cohort analysis (Zhang, 1987) , using data on annual catch in weight at age for 1970-88 in Korean waters. Annual biomass of croaker was highest in 1974 with about 100,000 mt, declining to a level of 20,000-30,000 mt after 1981. Adult biomass also showed a peak in 1974 with about 50,000 mt. Afterwards, however, it continuously dropped. According to the estimates of biomass at age obtained from this analysis, the age composition of small yellow croaker in the 1980's differed greatly from that in the 1970's. The proportions of older croakers (>5 years) were very low in the 1980's and even the biomasses of young croakers (1-4 years) were at a very low level in the 1980's. Year classes of 1968, 1972 and 1978 appeared to be relatively dominant. The mean value of instantaneous fishing mortality (F) in the 1980's was twice that of the 1970's. Recruitment of croaker exhibited an unusally linear relationship with adult stock biomass.
ISSN
0374-8111
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/6466
Bibliographic Citation
한국수산과학회지, v.25, no.1, pp.37 - 44, 1992
Publisher
한국수산과학회
Type
Article
Language
Korean
Publisher
한국수산과학회
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