Word: rainbows
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...Biologist Yukitaka Kanayama of Tokyo's Hosei University, the shimmering beauty of live rainbow trout is something to stir the scientific imagination. It pained Kanayama to think that most of the rainbow infants raised in Japan's hatcheries are no sooner released in a river than they are gobbled up by bigger fish, including their own elders. He decided to send rainbow babies to survival school...
...Their Own Good. Hatchery-innocent rainbow troutlets, less than an inch long, were plopped into the classroom. With the current turned off, they swam about at random, brushing the wires and the tin fish. But when Kanayama switched on the current, they darted all over the tank, desperate to avoid the harmless but painful shock. "I never felt guilty for doing this," says Kanayama fondly. "It was all for their own good...
...train a class so completely that none of them ever risked an electric shock. Then Kanayama held a graduation exercise. He put his pupils in one half of a tank divided by a wire screen through which they could swim easily. On the other side was a grown rainbow trout too big to pass through the screen's meshes. Untutored troutlets wandered guilelessly through the screen and were swallowed by the big fish, but Kanayama's conditioned babies made no such mistake. They associated painful shocks with the tin fish, and they associated the tin fish with...
...will get scare after scare and emerge fully trained for life in a dangerous river. But the biologist is still bothered. Why should successful students grow to bright-colored maturity only to be caught on an angler's hook? "I have become so fond of the lovely rainbow trout," he says with a tender smile, "that I may start another project to teach them to stay away from hooks. It should be easy enough. Rainbow trout are really smart...
Living colors envelop the rainbow...