What often occurs with the exceptionally long anal fin of the Wels Catfish?
Answer
It often merges with the caudal (tail) fin
The finnage of the Wels Catfish is specialized for steady movement rather than rapid bursts. The anal fin is described as exceptionally long, extending almost the entire length of the posterior underside of the fish. This extensive length leads to a common anatomical feature where the anal fin frequently merges directly with the rounded caudal fin. This configuration, combined with the large surface area of the dorsal fin, allows for powerful yet slow maneuvering, which is ideal for holding position in currents or executing deliberate predatory advances close to the bottom.
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