Warming seas slash Ulleung's squid catch by 99% in 25 years

The squid catch around Ulleung Island has plummeted amid rising sea temperatures caused by climate change, highlighting how warming waters are reshaping Korea’s marine ecosystem and the coastal communities that depend on it. According to Ulleung County on Sunday, the local catch fell from 11,315 tons in 2000 to 1,852 tons in 2015 and 1,172 tons in 2020, before plunging to 141 tons in 2025. The 2025 catch amounted to just 1.2 percent of the 2000 figure. The decline has continued this year, with only 54 tons caught from January to September. Squid is the signature seafood of the island in North Gyeongsang Province and has long been a mainstay of its economy. The decline stems largely from rising sea temperatures, which have reshuffled the marine food chain and are pushing squid out of Korean waters. The National Institute of Fisheries Science (NIFS) believes squid that would normally grow off Korea’s coast have moved north toward Russia and other areas as their main coastal and offshore habitat in the southern East Sea has warmed. The average sea surface temperature around the Korean Pe