Fishing nations agreed on Saturday to a slim reduction in quotas for catching giant Atlantic bluefin tuna, whose stocks have plunged as fishermen strive to meet demand from sushi lovers.

Ignoring calls from conservation groups for deep cuts, the International Commission for the Conservation of Atlantic Tunas (ICCAT) said its 48 member states, meeting in Paris, had set a 2011 quota of 12,900 tones, down 600 from this year.

An Atlantic bluefin can grow to the size of a horse and fetch as much as $100,000 in markets such as Japan, but stocks have plunged by more than 80 percent since 1970s, according to western scientists.