Spawning Season, and Factors Influencing Allometric Growth Pattern and Body Condition of Walleye Pollock Gadus chalcogrammus in the Middle East Sea, Korea

Lee, Chung Il; Han, Moon Hee; Jung, Hae Kun; Park, Hyun Je; Park, Joo Myun

doi:10.35399/isk.31.3.3

Cited by 7 publications

(4 citation statements)

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“…Large groups of pollock, depending on their size, predominantly inhabit specific temperature ranges. Larger pollocks prefer temperatures between 2-6 • C, whereas smaller pollocks primarily inhabit the temperature range of 4-12 • C [14,27,29,30]. These variations in the oceanic conditions of their preferred habitats, based on size and growth patterns, play a crucial role in their survival strategies.…”

Section: Discussionmentioning

confidence: 99%

“…The total lengths (TL) and weights of the specimens were measured to the nearest 0.1 cm and 0.1 g, respectively (Figure 2). To determine changes in the catch ratio between adult (≥37 cm) and juvenile (<37 cm) pollock during each time period, a total length (TL) of 37 cm was adopted as the standard for differentiation [14,33]. To compare the differences in the biological condition between each period, the condition factor was calculated for each period using the formula: K = 100 W/L 3 [34], where W and L represent body weight (g) and total length (cm), respectively.…”

Section: On-site Pollock Catch Data Around the Main Fishing Ground In...mentioning

confidence: 99%

“…During the 1970s and 1980s, pollock ranked as the second-largest catch among all fisheries in Korea. The pollock catch in Korea peaked in 1981 at approximately 170,000 metric tons but rapidly declined to a few hundred metric tons after the late 1980s [7,14]. Since the 2010s, pollock has ceased to be a commercial fishery resource in Korea, as catches fell below one metric ton [7,15,16].…”

Section: Introductionmentioning

confidence: 99%

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

Jung,

Park,

Yang

et al. 2024

Water

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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.

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Section: Discussionmentioning

confidence: 99%

Section: On-site Pollock Catch Data Around the Main Fishing Ground In...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Jung,

Park,

Yang

et al. 2024

Water

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“…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.

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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.

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Effects of water temperature changes on the early life stages (egg and larvae) of walleye Pollock (Gadus chalcogrammus) – Laboratory experiments and field applications

Park,

Yoo,

Jung

et al. 2024

Journal of Experimental Marine Biology and Ecology

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Spawning Season, and Factors Influencing Allometric Growth Pattern and Body Condition of Walleye Pollock Gadus chalcogrammus in the Middle East Sea, Korea

Cited by 7 publications

References 0 publications

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

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

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

Effects of water temperature changes on the early life stages (egg and larvae) of walleye Pollock (Gadus chalcogrammus) – Laboratory experiments and field applications

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