Unusual Ocean Conditions Including 22 Instances of High Water Temperature in Gyeonggi Bay Over 4 Years

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[Asia Economy (Suwon) = Reporter Lee Young-gyu] It has been revealed that a total of 22 cases of abnormal sea conditions, including high water temperatures, occurred in the 'Gyeonggi Sea' (Gyeonggi Bay) adjacent to Gyeonggi Province over the past four years.

The Gyeonggi Marine Fisheries Resources Research Institute announced on the 27th that from July 2018 to April 2022, it conducted regular water quality surveys 75 times at 10 locations near fishing grounds in three cities/counties of Gyeonggi Bay?Siheung, Ansan, and Hwaseong. The results confirmed 22 abnormal sea conditions: ▲3 cases of high water temperature alerts and warnings in 2019 ▲1 case of high water temperature alert and 1 case of low salinity in 2020 ▲5 cases of low water temperature warnings and alerts, 4 cases of high water temperature alerts and warnings, and 1 case of nutrient deficiency in 2021 ▲6 cases of low water temperature warnings and alerts and 1 case of nutrient deficiency in 2022.

Abnormal sea conditions refer to sudden changes in the sea environment such as high water temperature, low water temperature, and nutrient deficiency, which can cause economic damage to aquaculture farmers through diseases and mortality of cultured organisms.

A high water temperature alert is issued when temperatures reach 27?28℃ or 28℃, a low water temperature warning is issued when water temperature remains below 4℃ for more than three days, and nutrient deficiency refers to conditions where there is concern about yellowing disease in seaweed (dissolved inorganic nitrogen below 0.07 mg/L).

The Marine Fisheries Research Institute regularly collects data on 25 environmental factors of fishing grounds, including water temperature, nutrients, and sediment conditions, through water quality and sediment surveys.

Furthermore, based on this data, they analyze average water temperatures to predict rapid changes in marine environments such as high water temperature or low salinity, determine suitable habitats for cultured organisms, and estimate appropriate fishing periods.

Kim Bong-hyun, director of the Gyeonggi Marine Fisheries Resources Research Institute, stated, "We will continue to investigate the Gyeonggi Sea to build a high-quality marine environment database. Based on the fishing ground environment results secured by the institute, we will provide aquaculture utilization information and marine environment alerts to fishermen to help stabilize aquaculture activities."

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