Changes in the Biological Characteristics of Walleye Pollock Related to Demographic Changes in the East Sea During the Late 20th Century SCIE SCOPUS

Cited 4 time in WEB OF SCIENCE Cited 4 time in Scopus
Title
Changes in the Biological Characteristics of Walleye Pollock Related to Demographic Changes in the East Sea During the Late 20th Century
Author(s)
Bang, Minkyoung; Kang, Sukyung; Kim, Suam; Jang, Chan Joo
KIOST Author(s)
Bang, Min Kyoung(방민경)Jang, Chan Joo(장찬주)
Publication Year
2018-04
Abstract
Walleye pollock Gadus chalcogrammus (hereafter, pollock) was one of the predominant fish species in Korean waters during the 1970s and 1980s, but catches decreased rapidly beginning in the late 1980s and the fishery collapsed in the 2000s. The biological characteristics of fish species tend to depend on their biomass and environmental conditions. To investigate the changes in the biological characteristics of pollock (such as their size frequency, condition factor, and maturation) associated with biomass levels as well as the possible causes of the stock collapse as a result of environmental changes, we used data collected by the Korean National Institute of Fisheries Science (NIFS) during high (1976-1985) and low (1991-2000) periods of pollock biomass. Density-dependent effects on the pollock population were evident in Korean waters: pollock were larger and heavier at length during the low-biomass period. The gonadosomatic index also indicated that the peak spawning season was broad (from October to February) during the high-biomass period and narrower (December and January) during the low-biomass period. The population abundance and recruitment success of Korean pollock appear to have been affected by the warming of the ocean surface from the early 1990s. Thus, we suggest that the biomass fluctuations associated with environmental changes during their early life stages were responsible for the observed changes in the biological properties of pollock.
ISSN
1942-5120
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/991
DOI
10.1002/mcf2.10004
Bibliographic Citation
MARINE AND COASTAL FISHERIES, v.10, no.2, pp.91 - 99, 2018
Publisher
TAYLOR & FRANCIS INC
Subject
LIFE-HISTORY TRAITS; THERAGRA-CHALCOGRAMMA; BERING-SEA; NORTHERN JAPAN; REGIME SHIFT; MATURITY; POPULATIONS; ECOSYSTEM; RECRUITMENT; FISHERIES
Type
Article
Language
English
Document Type
Article
Publisher
TAYLOR & FRANCIS INC
Related Researcher
Research Interests

upper ocean dynamics,regional climate modeling,ocean climate change,해양상층역학,지역기후모델링,해양기후변화

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