see
http://www.nytimes.com/2011/12/22/science/scientists-urge-protection-of-forage-fish-for-seabirds-sake.html
A Call to Protect Humble Fish, for Seabirds’ Sake
By CORNELIA DEAN
Published: December 22, 2011
<snip>
Researchers from around the world are suggesting fishing pressure must
be limited. Their motto is “a third for the birds.”
In other words, they write in Friday’s issue of the journal Science,
fisheries managers should make sure that forage fish stocks do not
fall below one-third of their historic maximum long-term biomass — the
total amount of the fish, by weight.
When stocks fall below that level, the researchers write, breeding
rates start to falter for seabirds and possibly for predatory fish and
marine mammals as well.
<snip>
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