Amphistichus
Amphistichus is a genus of marine fish belonging to the family Embiotocidae, commonly known as surfperches. This genus includes two species, Amphistichus koelzi (the black surfperch) and Amphistichus argenteus (the silver surfperch). These fish are found along the Pacific coast of North America, ranging from Alaska to Baja California.
Characteristics
Amphistichus species are characterized by their elongated, compressed bodies, typically measuring between 20 and 40 centimeters in length. They have a distinctive dorsal fin, which is continuous and composed of both spiny and soft rays. The anal fin is also long and composed of soft rays. Their color varies depending on the species and habitat, with the black surfperch generally having a darker, more mottled coloration compared to the silver surfperch.
Environments
Amphistichus species are commonly found in rocky intertidal zones, tide pools, and kelp forests. They are often associated with areas of strong currents and wave action. These fish are known for their territorial behavior, particularly the males, which defend their territories during the breeding season.
Diet
Amphistichus species are primarily herbivorous, feeding on algae, invertebrates, and small fish. They play a crucial role in the marine ecosystem by grazing on algae and controlling populations of invertebrates.