What function do relatively large pectoral fins primarily serve for many wrasses?
Answer
Precise maneuvering around corals and rocks
The pectoral fins, situated on the sides behind the gills, are often noted as being relatively large in many wrasse species. This size is not for primary propulsion, which is generally handled by the caudal (tail) fin, but rather for fine control and agility. These large fins are essential tools that allow wrasses to navigate the highly complex and three-dimensional environment of coral reefs with great accuracy. They facilitate precise movements, allowing the fish to dart around obstacles, hold position tightly near crevices, and execute the intricate swimming required for foraging among corals and rocks.
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