A squid is a type of cephalopod that has an elongated body, eight arms and two tentacles. Globally, there are at least 300 species of squid distributed across the world's oceans. They're also a healthy food source as they're packed with protein, thus contributing to high-quality meals. But all the species of squid in Japan's waters have been declining since the 1980s and their estimated population sizes are just 10% of what they previously were. The situation is so dire that Japan, which has one of the highest rates of fish and seafood consumption in the world, now relies on imported, processed squid from South America.