The Effect of Warmer Water Temperature of Walleye Pollock (Gadus chalcogrammus) Larvae

Yoo, Hae-Kyun; Byun, Soon‐Gyu; Yamamoto, Jun; Sakurai, Yasunori

doi:10.7837/kosomes.2015.21.4.339

Cited by 10 publications

(5 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Surface temperatures higher than 12°C, which are presumably unfavorable for larval survival in April (Yoo et al. ), occurred more frequently during the low‐biomass period (Figure ) and may have contributed to the weak recruitment of pollock during the 1990s. The warming was also associated with substantial changes in the functioning of major species in the southwest East Sea ecosystem.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

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

et al. 2018

View full text Add to dashboard Cite

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)(1977)(1978)(1979)(1980)(1981)(1982)(1983)(1984)(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.

show abstract

Section: Discussionmentioning

confidence: 99%

“…A rearing experiment conducted by Yoo et al. () suggests that the survival rate of pollock larvae decreases rapidly at temperatures higher than 10–12°C. Based on this study, the number of days when the sea surface temperature (SST) exceeded 12°C was also computed.…”

Section: Methodsmentioning

confidence: 99%

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

et al. 2018

View full text Add to dashboard Cite

show abstract

“…In the experiment, the eggs were placed on surface grids, taking their density into account. The spawning grids were determined by their suitable spawning temperature range (2 °C-5 °C) and the appropriate habitat depths (50-500 m) for walleye pollock [10,21,[50][51][52]. We considered the potential spawning ground located in the EKB between 36°N and 41°N (figure 1(b)).…”

Section: Particle Tracking Experimentsmentioning

confidence: 99%

Severe reduction in spawning days and larval abundance of walleye pollock under future warming in the western East/Japan Sea

Kim,

Lee,

Kim

et al. 2024

Environ. Res. Commun.

View full text Add to dashboard Cite

The collapse of walleye pollock catch in the Korean fishing region during the late 1980s remains unresolved despite enormous efforts to recover its stock. To investigate the future fate of walleye pollock in the western East/Japan Sea (EJS) in the late 21st century, we implemented a dynamical downscaling approach by developing high-resolution regional ocean climate models (1/20°) with the selected Coupled Model Intercomparison Project 6 (CMIP6) global climate models. We analyzed the changes in the spawning area and larval distribution of walleye pollock in the western EJS. Under the SSP5-8.5 global warming scenario, the suitable spawning period ratio of walleye pollock was drastically reduced by 76%. The severe reduction in spawning grounds in the western EJS was mainly attributed to ocean warming caused by a decrease in atmospheric surface cooling. Moreover, our particle tracking experiment showed substantial loss of eggs and larvae south of 38°N. Our study projected a drastic collapse of walleye pollock in the western EJS and proposed a variety of collapse patterns based on local circulation under future warming conditions. These findings can help the local fishing industry adapt and assist neighboring governments in planning future fisheries management strategies.

show abstract

“…Most pollock spawn between January and March, with the eggs remaining in the surface layer after release as pelagic eggs [16,41]. The suitable temperature range for spawning grounds falls between 2-5 • C, considering the known optimal spawning temperature [21] and its correlation with low mortality [9,10,17,22,23]. Hence, changes in the spatiotemporal distribution of the spawning grounds were estimated using the following methods: (1) Assessing changes in the duration of suitable temperature (2-5 • C) for spawning (DTS) and its horizontal distribution at each decade using daily SST data, and (2) Analyzing long-term changes in the regional proportion for suitable spawning conditions (2-5 • C) (RPS) relative to the total area of DB.…”

Section: Long-term Changes In Oceanic Conditions Around Spawning and ...mentioning

confidence: 99%

“…Pollock aggregate to spawn during winter, from January to March, and the eggs released during this period remain in the surface layer [19,20]. The optimal spawning temperature associated with low mortality typically falls within the 2-5 • C range in the continental shelf area [9,[21][22][23]. Following hatching, juvenile pollocks move from their vertical distribution to deeper layers as they grow [24,25], and their dietary preferences evolve, transitioning from mesozooplankton to mesopelagic fish, as evidenced by stomach content analysis [26,27].…”

Section: Introductionmentioning

confidence: 99%

The Long-Term Dynamics of Walleye Pollock Stocks in Relation to Oceanographic Changes in the East Sea

Jung,

Park,

Yang

et al. 2024

Water

View full text Add to dashboard Cite

The decline in walleye pollock (Gadus chalcogrammus) stocks in Korean waters is a major concern for fishery conservation and management. However, the causes and mechanisms of this collapse remain unclear. This study investigated the complex dynamics influencing the abundance of walleye pollocks in the East Sea of Korea over several decades, by analyzing data from long-term changes in biological factors including composition of length and sex, catch, and oceanographic condition. Prior to the mid-1980s, the catch ratio of juveniles was higher than that of adults, with a higher proportion of females in both juvenile and adult catches compared to males. Especially, high fishing pressure on female individuals can be an important factor contributing to declining reproduction. Consequently, after the mid-1980s, there was a sudden decline in juvenile pollock catches. In the late 1980s, there was a rapid increase in sea surface temperature (SST) in the spawning grounds, resulting in a decrease in both the duration of suitable temperature for spawning and the regional proportion for suitable spawning conditions. Consequently, the decline in pollock stocks after the late 1980s due to overfishing of pollock in the mid-1980s was further exacerbated by the effects of SST warming after the late 1980s. These findings highlight the impact of overfishing and environmental factors on pollock stocks and indicate the need for appropriate fishery management practices to ensure the sustainable use of fishery resources.

show abstract

The Effect of Warmer Water Temperature of Walleye Pollock (Gadus chalcogrammus) Larvae

Cited by 10 publications

References 11 publications

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

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

Severe reduction in spawning days and larval abundance of walleye pollock under future warming in the western East/Japan Sea

The Long-Term Dynamics of Walleye Pollock Stocks in Relation to Oceanographic Changes in the East Sea

Contact Info

Product

Resources

About