Marine and Freshwater Biology Archives

When There Were Squid Shells

Ancient squid had shells, but now they don’t. How did that happen and why? Find out in this video about squid shells, from PBS Eons.

Some years bring massive jellyfish blooms. What causes these blooms of jellyfish and why are they increasing?

Whale sharks, the largest fish in the ocean, have been getting caught in commercial tuna fishing nets. New regulations may protect them.