魚は何故「魚の形」をしているのだろうか(生物の流れ(2),一般講演)

概要

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Although there exist various kinds of fish on the earth, a noticeable fact commonly observed among fish is that fish have the 'fish-like geometry', that is, their body is composed of a streamlined forebody connected with a caudal fin, which has a large depth at its very end while it shrinks almost to a point where it is connected to the forebody. It is also characteristic that a fish undulates its body laterally when it swims. In the present study, we investigate why fish have such 'fish-like geometry'. Under a big assumption that fish have attained such 'fish-like geometry' through millions of years of evolution, or, in another words, fish's bodies have evolved in such a way that their bodies are optimized for their swimming, using the mathematical optimization theory, an optimized swimming object is identified, which turns out to be surprisingly similar to the 'fish-like geometry'.
2010-09-09