So many ideas that seem great on paper dont look too good after careful examination. I thought about using shark liver to make biodiesel. At present I discard it and always wanted to find a use for it. I gave up the Idea , mostly because I thought it was too much trouble , but also because that liver is'nt totally wasted , its eaten by all sorts of creatures so it goes back into the food chain. This is something no scientist ever seems to consider when talking about by-catch discards.
Dont forget aquaculture either , pulling huge quantities of low value bait fish out of the wild to feed farmed fish. Who wins and who loses there.

CLEM