Researchers analyzed how variations in environmental factors and climate indices in the study area had an impact on the catch and duration of T. orientalis. The catch average and length of T. orientalis in this study showed strong seasonal differences, and most T. orientalis caught around Jeju Island ranged from 40-60 cm which were classified as immature.
On the other hand, the T. orientalis fishing grounds are located east of Jeju Island, and the average annual SST ranges from 19-23 ° C. According to the picture below, T. orientalis has two spawning sites located in the northern region of the Kuroshio axis in Taiwan Sea and East Sea (Bayliff 1994; Okiyama 1974; Chen et al 2006; Tanaka et al 2007). Therefore, fishing grounds around Jeju Island are considered as a pathway to migrate to the north from T. orientalis plants that are immature which are spawned in the Taiwan Sea.
In the relationship between monthly catches and environmental factors, the catch of T. orientalis is influenced by seasonal variations. If the temperature of the sea water is 50 m low (ie, winter and spring), the catch is high. In the case of PDOI, when PDOI is high (ie, winter and spring), the catch is high.
In the time series of annual variations, when SST is relatively warm (ie warm period), catches of T. orientalis are high. In addition, if PDOI has a low value, the catch is high. Fishing grounds have been formed east of Jeju Island during this research period. The highest catches and catches per unit of effort (CPUE) from T. orientalis around Jeju Island occur when sea water temperatures at 50 m range between 15 and 16 ° C or when catches are taken near the frontal area.
Researchers analyzed how variations in environmental factors and climate indices in the study area had an impact on the catch and duration of T. orientalis. The catch average and length of T. orientalis in this study showed strong seasonal differences, and most T. orientalis caught around Jeju Island ranged from 40-60 cm which were classified as immature.
On the other hand, the T. orientalis fishing grounds are located east of Jeju Island, and the average annual SST ranges from 19-23 ° C. According to the picture below, T. orientalis has two spawning sites located in the northern region of the Kuroshio axis in Taiwan Sea and East Sea (Bayliff 1994; Okiyama 1974; Chen et al 2006; Tanaka et al 2007). Therefore, fishing grounds around Jeju Island are considered as a pathway to migrate to the north from T. orientalis plants that are immature which are spawned in the Taiwan Sea.
In the relationship between monthly catches and environmental factors, the catch of T. orientalis is influenced by seasonal variations. If the temperature of the sea water is 50 m low (ie, winter and spring), the catch is high. In the case of PDOI, when PDOI is high (ie, winter and spring), the catch is high.
In the time series of annual variations, when SST is relatively warm (ie warm period), catches of T. orientalis are high. In addition, if PDOI has a low value, the catch is high. Fishing grounds have been formed east of Jeju Island during this research period. The highest catches and catches per unit of effort (CPUE) from T. orientalis around Jeju Island occur when sea water temperatures at 50 m range between 15 and 16 ° C or when catches are taken near the frontal area.
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