Sebastes caurinus

Geographic Range

Copper rockfish are found in waters along the Pacific coast ranging from Baja, California up to Kehui, Alaska. They are common in the waters of British Columbia and in Puget Sound.

• Biogeographic Regions
• pacific ocean pacific ocean
  • native native

Habitat

Copper rockfish are demersal, preferring the ocean bottom near low-profile rocks and reefs. The range of water depths they inhabit is relatively broad, from 10 to 183 meters, and the fish are found in shallower water during upwelling. Most often, these fish are in close contact with reefs, maintaining an even closer contact during the winter and spring than in the summer months. Tagging experiments have suggested that mature fish do not move far from their home location.

• Habitat Regions
• saltwater or marine saltwater or marine

• Aquatic Biomes
• benthic benthic
• reef reef

Physical Description

Their overall color is variable but a copper-brown color with darker fins is generally observed. Patches of yellow or copper are also present, usually near the gill coverings. They are distinguished from other rockfish species by the clear areas along the posterior two thirds of the lateral lines, and in having a whitish underside. They have 13 dorsal and 3 anal spines that are mildly venomous.

• Other Physical Features
• bilateral symmetry bilateral symmetry

Development

Copper rockfish are live-bearers and in California waters, the larvae are released in the spring when they are 5-6 mm in length. Generally among rockfish, the larvae drift in offshore waters and survive in the upper 80 m of the water column for 1-2 months before they transform into juveniles. Because of identification problems with other species of rockfish, the distribution of copper rockfish larvae and juveniles are often debated. In central California, these juveniles are closely associated with the surface and mid-depth kelp beds and do not become benthic until they have reached 40-50 mm.

Growth rates are fastest in fish less than 3 years old and are highest in the summer months, coinciding with high feeding rates and upwelling. Sexual maturity has been shown to vary slightly between different regions along the Pacific coast. Off central California, males become sexually mature between the ages of 3 and 7 years. Females are fully mature by 8 years. These fish often reach 20 years of age.

• Development - Life Cycle
• metamorphosis metamorphosis

Reproduction

No information could be obtained describing the mating behaviors of copper rockfish or any of the various rockfish species.

Spawning in copper rockfish occurs once a year in the spring at a time that varies geographically. Fertilization occurs internally, and little is known about the specific courtship or mating behaviors. Females move inshore to release their young and are capable of regulating where and when larvae are released. This is thought to be dependant on environmental conditions. As is true of other rockfish species, fecundity is related to length.

• Key Reproductive Features
• seasonal breeding seasonal breeding
• gonochoric/gonochoristic/dioecious (sexes separate)
• sexual sexual
• fertilization fertilization
  • internal internal
• ovoviviparous ovoviviparous

Copper rockfish larvae are independent once they are released inshore. The female provides internal nourishment to the embryos until they are released.

• Parental Investment
• pre-hatching/birth
  • provisioning
    • female

Lifespan/Longevity

Copper rockfish can live to be decades old and take several years to become sexually mature. Once mature, females generally produce a higher number of eggs each year. These traits are important for the survival of the species since a relatively low percentage of young survive each year. Few if any efforts have been made to breed copper rockfish in captivity.

Behavior

Adult copper rockfish are highly residential and remain near their home site. Although they are a solitary species and usually seen alone, they are sometimes present in mixed aggregates with other species. Individual fish display agnostic behavior to show "protective territoriality".

• Key Behaviors
• natatorial natatorial
• motile motile
• sedentary sedentary
• solitary solitary

Home Range

Sebastes caurinus inhabit the pacific ocean coast from Baja, Californis to Kehui, Alaska and usually do not swim more than a mile from their home.

Communication and Perception

No information was available on communication in this species.

• Perception Channels
• visual visual
• tactile tactile
• chemical chemical

Food Habits

Copper rockfish are opportunistic carnivores that feed mainly on organisms present near the ocean floor, usually crabs , mollusks and other fish. They feed during the day as well as at night. Often the prey varies with the season with crabs eaten more often in winter and early spring. Large copper rockfish tend to be aggressive feeders and sometimes prey on Squalus acanthias , a small shark species.

• Primary Diet
• carnivore carnivore
  • piscivore piscivore
  • eats non-insect arthropods

• Animal Foods
• fish
• mollusks
• aquatic or marine worms
• aquatic crustaceans

Predation

Juvenile rockfish that reside in kelp beds are often eaten by many fishes and other marine animals. Adults are eaten by lingcod Ophiodon elongatus and also other large predators.

Ecosystem Roles

At all life stages, copper rockfish are eaten by other fish. They also eat different types of fish and marine invertebrates.

Economic Importance for Humans: Positive

The copper rockfish, as well as other rockfish species that live in the California coastal waters, are very important to commercial and sport fisheries. The 60 species of rockfish caught account for 34% by weight of all sportfish landed in California.

• Positive Impacts
• food food

Economic Importance for Humans: Negative

Copper rockfish have no known negative impacts on humans.

Conservation Status

Copper rockfish are not yet theatened, however other rockfish species are endangered. Rockfish are a valuable game fish and it is important for precautions to be implemented to prevent overfishing. This is especially important with rockfish populations since the fish have long lifespans with their reproductive capacity increasing as they age.

Additional Links

Encyclopedia of Life

Contributors

Jessica Gumerson (author), University of Michigan-Ann Arbor, William Fink (editor, instructor), University of Michigan-Ann Arbor.

Matthew Wund (editor), University of Michigan-Ann Arbor.

References

Albin, D., K. Karpov, W. Van Buskirk. 1995. "Endangered and Threatened Species: Puget Sound Populations of Copper Rockfish, Quillback Rockfish, Brown Rockfish, and Pacific Herring" (On-line). Accessed December 08, 2004 at http://www.psmfc.org/~wvanbusk/pub/kelp/no3/index.htm#contents .

Black, H. 2002. Fishing for Answers to Questions about the Aging Process. BioScience , Vol. 52 No. 1: 15-18.

Boschung, Jr., H. 1983. The Audubon Society field guide to North American fishes, whales, and dolphins . New York: Knopf: Distributed by Random House.

Coad, B. 1995. Encyclopedia of Canadian fishes . Waterdown, Ont.: Canadian Sportfishing Productions.

Froese, R. 2004. "FishBase" (On-line). Accessed October 25, 2004 at http://www.fishbase.org .

Hart, J. 1973. Pacific fishes of Canada . Ottawa: Fisheries Research Board of Canada.

Johnson, S., M. Murphy, D. Csepp. 2003. Distribution, habitat, and behavior of rockfishes, Sebastes spp., in nearshore waters of southeastern Alaska: observations from a remotely operated vehicle. Environmental Biology of Fishes , 66: 259-270.

U.S. Fish and Wildlife Service. Species profiles: life histories and environmental requirements of coastal fishes and invertabrates (Pacific Southwest) - brown rockfish, copper rockfish, and black rockfish. 82(11.113). Washington, DC: U.S. Army Corps of Engineers. 1989.