{"id":40077069,"date":"2019-03-05T00:00:00","date_gmt":"2019-03-04T18:30:00","guid":{"rendered":"http:\/\/china-dialogue-ocean-staging.darkbluehq.com\/uncategorized\/6923-east-china-sea-global-warming\/"},"modified":"2022-02-10T23:00:52","modified_gmt":"2022-02-10T17:30:52","slug":"6923-east-china-sea-global-warming","status":"publish","type":"post","link":"https:\/\/dialogue.earth\/en\/ocean\/6923-east-china-sea-global-warming\/","title":{"rendered":"East China Sea fish stocks hit hard by global warming"},"content":{"rendered":"

Warming oceans have caused a slump of up to 35% in some global fish populations, with over-exploitation of stocks exacerbating the problem, a new study has found<\/a>.<\/p>\n

Many fish species have been unable to adapt to the pace of global warming and scientists recorded an overall 4.1% drop in sustainable catches between 1930 and 2010.<\/p>\n

The worst-affected ocean was the Sea of Japan, with a 34.7% reduction in fishery size. The East China Sea saw a drop of 8.3%.<\/p>\n

\"Haddock
Haddock in the North Sea are among the climate change \u201closers\u201d as a result of warming ocean temperatures. (Image: NEFSC\/NOAA)<\/figcaption><\/figure>\n

Malin Pinsky, a co-author of the study and associate professor at Rutgers University, US, said: \u201cWe were stunned to find that fisheries around the world have already responded to ocean warming. These aren’t hypothetical changes sometime in the future [anymore].\u201d<\/p>\n

\u201cIt\u00a0affects not just local economies but global trade and\u00a0the\u00a0ripple effects are felt all around the\u00a0world.\u00a0I do worry about the East China\u00a0Sea,\u00a0the\u00a0Sea of\u00a0Japan and\u00a0North\u00a0Sea\u00a0in particular because\u00a0the declines\u00a0there have\u00a0already been so large.\u201d<\/p>\n

The East China Sea was suffering from a classic \u201cone-two punch\u201d of global warming and overfishing, he\u00a0told China Dialogue Ocean<\/em>, with overfishing reducing population sizes and changing their demographics.<\/p>\n

Smaller, weaker and less genetically diverse fish\u00a0are\u00a0thought to be more vulnerable to\u00a0the onset of\u00a0climate change.<\/p>\n

In all,\u00a0235 fish populations and 124 species were studied in 38 ecological regions by scientists from Rutgers and the National Oceanic and Atmospheric Administration (NOAA).<\/p>\n

Using global fisheries data and ocean temperature maps, the researchers estimated temperature-driven changes to the world\u2019s sustainable catch, a bracket that covers about one third of the reported global numbers.<\/p>\n

They found that the five fish species worst affected by overheating oceans were: Atlantic cod (in the North Sea and Irish Sea), sand eel, common sole, saithe (also known as pollock) and haddock.<\/p>\n

A smaller number of\u00a0fish\u00a0species\u00a0were positively affected by\u00a0the balmier marine conditions,\u00a0including\u00a0Greenland halibut, Atlantic cod (in the Gulf of St Lawrence,\u00a0where temperatures were previously colder than optimal for cod), Atlantic herring, sea scallop and northern shrimp.
\n

<\/p>\n
\"Black
Black sea bass are one of the climate change temporary \u201cwinners\u201d that have seen their numbers increase with warming ocean temperatures. (Image: Orion Weldon)<\/figcaption><\/figure>\n

<\/div><\/p>\n

\u201cFish populations can only tolerate so much warming, though,\u201d cautioned Olaf Jensen, another study author and Rutgers professor. \u201cMany of the species that have benefited from warming so far are likely to start declining as temperatures continue to rise.\u201d<\/p>\n

The new paper says that heated seas are driving changes in ocean circulation and stratification, losses in oxygen concentration and shifts in the distribution and nature of fish populations.<\/p>\n

This puts fish stocks under\u00a0increasing\u00a0physiological stress,\u00a0with implications for\u00a0food availability \u2013\u00a0a\u00a0growing\u00a0concern\u00a0in coastal developing countries where\u00a0fish\u00a0account for up\u00a0to\u00a0half the\u00a0dietary\u00a0animal\u00a0protein.<\/p>\n

Pinsky said\u00a0that dwindling sea biodiversity<\/a>\u00a0caused by\u00a0warming oceans could even trigger conflicts,\u00a0such as\u00a0the northern European \u201cmackerel wars\u201d.<\/p>\n

\u201cWhen mackerel shifted north into Icelandic waters, they couldn\u2019t agree with the EU how to share access to that fishery,\u201d he said. \u201cIt led to overfishing and spilled over into a trade war which appeared to spur Iceland to drop its bid to join the EU.\u201d<\/p>\n

The problem can create a feedback loop in which overfishing makes fisheries more vulnerable to ocean warming, while warming then hinders the rebuilding of depleted populations.<\/p>\n

\n

75%<\/p>\n

\n
\nLimiting global warming to 1.5C would benefit the fisheries of over 75% of maritime countries
\n\n <\/div>\n <\/div>\n

Chris Free, a research leader on the study, said: \u201cWe recommend that fisheries managers eliminate overfishing<\/a>, rebuild fisheries and account for climate change in fisheries management decisions. Policymakers can prepare for regional disparities in fish catches by establishing trade agreements and partnerships to share seafood between winning and losing regions.\u201d<\/p>\n

Achieving the Paris Agreement goal of limiting global warming to 1.5C could also make a huge difference, protecting millions of tonnes of global fisheries catch, and benefitting over 75% of maritime countries, according to a separate report published in Science Advances.<\/em><\/p>\n

Its lead author, Rashid Sumaila, said: \u201cThe largest gains will occur in developing country waters, such as Kiribati, the Maldives and Indonesia, which are at greatest risks due to warming temperatures and rely the most on fish for food security, incomes and employment.\u201d<\/p>\n

The greatest losses recorded in the Rutgers paper were in the Sea of Japan, North Sea, Iberian Coastal, Kuroshio Current and Celtic-Biscay Shelf regions. By contrast, Labrador-Newfoundland, Baltic Sea, Indian Ocean and Northeast US Shelf regions had\u00a0 the biggest gains.<\/p>\n

The next\u00a0research phase for ocean warming is likely to probe\u00a0under-explored effects\u00a0in tropical regions \u2013\u00a0as well as\u00a0factors such as ocean oxygen content\u00a0and\u00a0acidity.<\/p>\n","protected":false},"excerpt":{"rendered":"

The fishery shrunk by an estimated 8.3% between 1930 and 2010<\/p>\n","protected":false},"author":0,"featured_media":40066925,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[761,50039901],"tags":[519,545],"hashtags":[],"country":[20000110,50040727],"class_list":["post-40077069","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-climate","category-ocean","tag-climate-impacts","tag-fisheries","country-china","country-japan"],"acf":[],"yoast_head":"\nEast China Sea fish stocks hit hard by global warming | Dialogue Earth<\/title>\n<meta name=\"description\" content=\"Fish populations in the East China Sea shrunk by an estimated 8.3% between 1930 and 2010, due to warming oceans and climate change.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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