Oceans cover about 70% of the Earth. Conservationists are trying to protect the oceans, however, huge amounts of waste pollute the waters. This threatens the ocean purity and ocean creatures. Oil leaking into the ocean is a huge factor in water pollution, and many people have heard about the Exxon Valdez accident, when 39,000 tons of crude oil spilled in the water in Alaska. However, tanker accidents aonly account for about 5 per cent of all the amount that pollutes the seas and oceans. Most come from motor oil that comes from the cities and factories. The bottom paint of ships is another pollution factor, it can cause infertility to the ocean creatures and gets accumulated in the food chain.
About 30% of mackerel in the Atlantic Ocean have moved to Iceland in the last few years caused by the ocean temperature changes and now swarms near Iceland, and mackerel is a big part of Icelandic pelagic fishing. The reason behind mackerel movement is that the fish is used to certain temperature like almost every type of fish, and because the ocean temperature has been rising, so have the mackerel shawls been shifting to find to find the temperature that they require.
The pelagic zone is basically any water in a sea or lake that is not close to the bottom of the sea so the Pelagic fish is the most common fishing resource.
Salmon, trout and demersal fish have decreased by 55% all over the world because the ocean temperature is rising and many of these species prefer a cold environment. Demersal fish is the kind of fish that lives and feeds at the bottom of the sea and lakes.
Written by Ármann and Hrafn