'Tiny fish that survived tsunami, ocean crossing from Japan makes debut in Seaside'

Why not keep all the fish in the aquarium, instead of killing them save for one?

Tiny fish that survived tsunami, ocean crossing from Japan makes debut in Seaside | OregonLive.com: About five striped beakfish were found on a boat from Japan that washed ashore near Long Beach, Wash., last month. The Washington Department of Fish & Wildlife euthanized most of them, perhaps because of fears that the fish would become an invasive species.

But not before someone spirited away one of the black-and-white striped fish to the Long Beach City Hall.

Employees there in turn called the Seaside Aquarium, which came to the rescue.
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Continuing coverage of the debris washing up on the Oregon and Washington coasts from the Japanese tsunami.
"They didn't want to turn it loose," said Seaside Aquarium curator Keith Chandler. "And they didn't want to let it die."

So Chandler and the aquarium staff rescued the critter they have dubbed the "tsunami fish."