In man or fish, wriggling is a sign of inferiority. To the whale, his tail is the sole means of propulsion. Scroll-wise coiled forwards beneath the body, and then rapidly sprung backwards, it is this which gives that singular darting, leaping motion to the monster when furiously swimming.
 Herman Melville, Moby-Dick (1851). copy citation

add
Author Herman Melville
Source Moby-Dick
Topic inferiority swimming
Date 1851
Language English
Reference
Note
Weblink http://www.gutenberg.org/files/2701/2701-h/2701-h.htm

Context

“First, when used as a fin for progression; Second, when used as a mace in battle; Third, in sweeping; Fourth, in lobtailing; Fifth, in peaking flukes.
First: Being horizontal in its position, the Leviathan’s tail acts in a different manner from the tails of all other sea creatures. It never wriggles. In man or fish, wriggling is a sign of inferiority. To the whale, his tail is the sole means of propulsion. Scroll-wise coiled forwards beneath the body, and then rapidly sprung backwards, it is this which gives that singular darting, leaping motion to the monster when furiously swimming. His side-fins only serve to steer by.
Second: It is a little significant, that while one sperm whale only fights another sperm whale with his head and jaw, nevertheless, in his conflicts with man, he chiefly and contemptuously uses his tail.” source