Beneath the Waves in California - ecophotog

© Joseph Dougherty. All rights reserved. Heterodontus francisci (Girard, 1855) Horn Shark The horn shark is a clumsy, sporadic swimmer that prefers to use its flexible, muscular pectoral fins to push itself along the bottom. It is usually solitary, though small groups have been recorded. During the day, horn sharks rest motionless, hidden inside caves or crevices, or within thick mats of algae, though they remain relatively alert and will swim away quickly if disturbed. After dusk, they roam actively above the reef in search of food. Horn sharks maintain small home ranges of around 1,000 m2 (11,000 sq ft), which they may remain faithful to for over a decade, returning to the same shelter every day. The shelter is usually located at the edge of the resident shark's foraging area. The longest documented movement for an individual horn shark is 16 km (9.9 mi).

sharkscartilaginous fishesHeterodontus francisciHeterodontusHeterodontidaeCalifornia wildlifemarine fishcalifornia fishchannel islandssharks and raysrocky reefskelp forest

From Catalina Island -- Peace Dive Boat -- June 2013