Residents of the Greek island of Poros have expressed fears over a plan to expand industrial fish farming, which threatens to occupy a quarter of the island and cause environmental damage.
One of the world’s last remaining natural paradises is being damaged by the expansion of salmon farming in Chile, scientists and environmentalists have warned.
China and Russia are expected to block plans for protecting the seas around the Antarctic from over-fishing.
Fishing companies are hoping to "double" their catches of krill — tiny animals that sustain the Antarctic Ocean — to feed the fish farming industry.
The trucks are lined up on the beach, rear doors open towards the ocean. On the sand there are piles of empty crates, and every now and then a worker takes one and goes to meet the small coloured pirogues that reach the beach loaded with fish.
Fish farmers insist the impact is minimal, Greek scientists now claim the pollution they produce is killing crucial marine ecosystems.
As farming of sea bass and sea bream has grown in Greece and Italy, so have environmental concerns.
Fish farmers in Scotland are permitted to use 16 "toxic" chemicals to kill parasites and fungi, control infections and anaesthetise fish.