What is the function of the ceratotrichia in a perch?

Ceratotrichia are the fine, flexible rays found in the fins of a perch and other bony fish. Their primary function is to provide structural support and stability to the fins, allowing for effective movement and maneuverability in the water. These rays help to maintain the fin's shape during swimming, facilitating propulsion and aiding in the fish's ability to change direction quickly. Additionally, ceratotrichia play a role in the overall hydrodynamics of the fish, enhancing its swimming efficiency.