동해 명태 자원량 변동에 따른 생물학적 특징 변화

Title
동해 명태 자원량 변동에 따른 생물학적 특징 변화
Alternative Title
Changes in ecological characteristics of walleye pollock Gadus chalcogrammus in accordance with the biomass fluctuation
Author(s)
방민경; 강수경; 김수암; 손명호
KIOST Author(s)
Bang, Minkyoung(방민경)
Publication Year
2015-10-22
Abstract
To investigate environmental effects on the pollock stock we compared differences in biological and ecological parameters during high (1970s-1980s) and low (1990s-2000s) biomass periods. Pollock length frequencies showed that a larger sizeclass was dominant in the low biomass period when their condition factor was larger, as well. This indicates that growth was relatively better during the low biomass period. The gonad-somatic index also revealed that the peak spawning season was in February during the high biomass period but changed to December during the low biomass period. Population Stock Density (PSD), which is index of size structure based on length frequency, was higher during the low biomass period than during the high biomass period, indicating recruitment intensity of pollock became weaker in 1990s.lass was dominant in the low biomass period when their condition factor was larger, as well. This indicates that growth was relatively better during the low biomass period. The gonad-somatic index also revealed that the peak spawning season was in February during the high biomass period but changed to December during the low biomass period. Population Stock Density (PSD), which is index of size structure based on length frequency, was higher during the low biomass period than during the high biomass period, indicating recruitment intensity of pollock became weaker in 1990s.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/25241
Bibliographic Citation
2015 PICES Annual meeting, pp.85, 2015
Publisher
PICES
Type
Conference
Language
English
Publisher
PICES
Related Researcher
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