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Fig. 2. Light video images of the posterior trunk and fins of rainbow trout during steady swimming at two speeds and during turning. Lateral and dorsal image pairs for each behavior were recorded simultaneously. As swimming speed increases from 1.0 to 2.0 body lengths (L) s–1, dorsal fin height decreases, while the height of the adipose fin remains unchanged (A,C). During turning, the dorsal fin is erected (E) and moves unilaterally (indicated by arrow in F) toward the stimulus, causing body rotation in the opposite direction. Ad, adipose fin; An, anal fin; D, soft dorsal fin; Pv, pelvic fin.





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