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This led to more fish dying, including spined stickleback and eels.

Studies of sticklebacks, for example, have shown that different populations that moved from salt to freshwater consistently underwent the same morphological and physiological changes to organs such as their kidneys, with genetic changes to match.

The lubricating proteins were abundant in the fish’s jaws and in the fins of zebra fish, gar, and sticklebacks, the scientists reported.

Then the first stickleback will go a little further, taking its turn being the one nearest the predator.

Earlier this month, Krantz visited a stickleback translocation effort that he helped to organize.