How are the two dorsal fins of the walleye structurally described?
Answer
The first being spiny and the second being soft-rayed.
The physical structure of the walleye includes two distinct dorsal fins that serve different protective or functional roles. The first dorsal fin is characterized by having spines, which are rigid elements that offer defense against predators or injury. In contrast, the second dorsal fin is composed of soft rays, allowing for more flexibility in movement or steering. This dual structure—spiny in the front and soft-rayed in the rear—is a key physical trait shared with other members of the perch family.
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