World Library  
Flag as Inappropriate
Email this Article

Redspotted catshark

Article Id: WHEBN0004551031
Reproduction Date:

Title: Redspotted catshark  
Author: World Heritage Encyclopedia
Language: English
Subject: Schroederichthys, Scyliorhinidae, WikiProject Sharks/Watchlist, Chain catshark, Aulohalaelurus
Collection:
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Redspotted catshark

Redspotted catshark
Conservation status
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Subclass: Elasmobranchii
Superorder: Selachimorpha
Order: Carcharhiniformes
Family: Scyliorhinidae
Genus: Schroederichthys
Species: S. chilensis
Binomial name
Schroederichthys chilensis
(Guichenot, 1848)

The redspotted catshark, Schroederichthys chilensis, also known as the Chilean catshark, is a species of catshark commonly found in the coastal waters of the southeastern Pacific, from central Peru to southern Chile. They are typically found in the rocky sublittoral areas at the edge of the continental shelf, in waters down to 100 m in depth. They spend the spring, summer, and fall in rocky subtidal areas, but winter in deeper offshore waters due to the strong currents at that time of year.

Contents

  • Physical description 1
  • Behavior 2
  • Food habits and predation 3
  • Reproduction 4
  • Conservation status and economic impact 5
  • References 6
  • External links 7

Physical description

Redspotted catsharks range in length from 30 to 66 cm, although these sizes are taken from captured sharks, and it is believed that they may grow larger than this.

Their bodies are elongate and sleek, typical of the catshark family. Their dorsal side is a dark reddish brown with dark saddle patterns on their side. Their ventral sides are a creamy white with reddish spots. Redspotted catsharks have two dorsal fins, with the first dorsal axil over the pelvic region. Their dorsal fins do not have spines, and their tails have no upward bend.

Redspotted catsharks have multicuspid teeth, however males typically have longer teeth with fewer cusps. This is believed to aid in courtship biting.

Behavior

Redspotted catsharks are solitary, nocturnal creatures. They stay in caves and crevices during the day and emerge at night to feed. They are migratory, however they live most of the year near the edge of the continental shelf.

Communication specific to the redspotted catshark is unknown. However, as with most other sharks, including other members of the family Scyliorhinidae, it is believed that they have a well-developed sense of smell, and that they are electroreceptive, which allows them to detect electricity emitted by other animals, and may also allow them to detect magnetic fields, which aids in navigation.

Food habits and predation

Redspotted catsharks feed on organisms that dwell on the rocky bottom near the continental shelf. Their primary food sources are various species of crabs and the rhynchocinetid rock shrimp Rhynchocinetes typus (Farina and Ojeda 1993) . They have also been known to eat fishes, algal material, and various polychaetes.

Redspotted catsharks are an important predator within their ecosystem. They have a large influence on commercially fished benthic organisms that dwell in the rocky near-shore areas.

Redspotted catsharks are host to trypanosomes, parasites that are passed into the catsharks' bloodstream through leeches.

There are no known predators to the catshark, although juveniles typically spend their early life in the deeper offshore waters. This is believed to be to avoid predators, although what those predators are is unknown.

Reproduction

Redspotted catsharks are oviparous. Breeding occurs in individuals in an annual cycle. However, they mate seasonally, typically in spring and winter, though females have occasionally been shown to have egg capsules in the summer. They are polygynandrous and while the male fertilizes the female's eggs he typically performs what is called a "courtship ritual" that consists of the male biting the female.

Redspotted catsharks are born from encapsulated eggs that are fertilized and released into the water. There are typically two eggs in each capsule, which can also be called a mermaid's purse. Embryos feed on the yolk of the egg until they hatch. Once these eggs hatch the sharks appear to be miniature versions of adults, however, the sharks grow rapidly. It is believed that juveniles swim into deeper waters in order to avoid predation in the sublittoral zone that they return to when they are adults. Therefore, there is a spatial segregation between adult and juvenile populations.

Conservation status and economic impact

Redspotted catsharks are not listed as endangered on the IUCN Red List, the U.S. Federal List, or the CITES list. They are not known to be a vulnerable or threatened species.

Redspotted catsharks have a negative economic impact on humans. They feed heavily on near shore benthic crustaceans. This is a detriment to commercial fisherman because crustaceans in this area have a large economic importance. Catsharks are also a frequent bycatch of nearshore fishing trawlers, which, while not economically significant, can cause damage to nets as well as time lost in removing the bycatch from the viable catch.

References

  • Lamilla (2004). Schroederichthys chilensis. 2006. IUCN Red List of Threatened Species. IUCN 2006. www.iucnredlist.org. Retrieved on 9 May 2006. Database entry includes justification for why this species is listed as data deficient
  • "Schroederichthys chilensis".  
  • 2004. "Clase Elasmobranchii" (On-line). Accessed October 29, 2004 at http://www.biouls.cl/biozoo/Vertebra/sispez2.htm.
  • Ackley, V. and W. Fink. 2004. "Schroederichthys chilensis" (On-line), Animal Diversity Web. Accessed March 28, 2006 at http://animaldiversity.ummz.umich.edu/accounts/information/Schroederichthys_chilensis.html.
  • Aedo, G., H. Arancibia. 2001. Gastric evacuation of the redspotted catshark under laboratory conditions. Journal of Fish Biology, 58: 1454-1457.
  • Budker, P. 1971. The Life of Sharks. New York: Columbia University Press.
  • Carpenter, K., S. Luna. 2004. "Schroederichthys chilensis Redspotted Catshark" (On-line). Accessed October 29, 2004 at http://filaman.uni-kiel.de/summary/SpeciesSummary.cfm?id=839.
  • Farina, J., F. Ojeda. 1993. Abundance, activity, and trophic patterns of the redspotted catshark, Schroederichthys chilensis, on the Pacific temperate coast of Chile. Copeia, 2: 545-549.
  • Morillas, J., M. George-Nascimento, H. Valeria, R. Khan. 1987. Trypanosoma humboldti n. sp. from the Chilean Catshark, Schoroederichthys chilensis. Journal of Protozoology, 34/3: 342-344.
  • Nelson, J. 1984. Fishes of the World. New York: John Wiley and Sons.
  • Ommanney, F. 1964. The Fishes. New York: Time Incorporated.
  • Smith, M., P. Heemstra. 1986. Smiths' Sea Fishes. South Africa: L. L. B. Smith Institute of Ichthyology.
  • Smith, J. 1949. The Sea Fishes of Southern Africa. South Africa: Central News Agency LTD.
  • Froese, Rainer and Pauly, Daniel, eds. (2006). "Schroederichthys chilensis in FishBase. January 2006 version.

External links

  • Animal Diversity Web
  • ICUN Red List Classification
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 



Copyright © World Library Foundation. All rights reserved. eBooks from World Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.