Fish oil is a common nutritional supplement, often recommended by doctors. Where does it come from?
Shrimp is a popular food. Are there different kinds of shrimp? Where do they come from? Are some sources and species more environmentally friendly than others? (Hint: the Monterey Bay Aquarium site addresses this issue, and there are other sites you can consult.)
Shark fin soup. What is the issue with shark fin soup?