What is the distinguishing feature regarding the dorsal fin origin on the Wels Catfish?
Answer
It originates relatively far back on the body and is quite long
The finnage structure of the Wels Catfish is crucial to its method of slow, powerful propulsion. The dorsal fin is described as a striking feature because it originates relatively far back along the body structure. Furthermore, this fin is quite long, extending across a substantial portion of the fish's back. This extensive dorsal surface area works in conjunction with the very long anal fin to provide the necessary lift and surface area for steady, controlled movement ideal for an obligate bottom feeder.
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