The noun has one meaning:
Meaning #1:
any of numerous sharks from small relatively harmless bottom-dwellers to large dangerous oceanic and coastal species
Requiem shark
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| Wikipedia: Requiem shark |
| Requiem sharks Fossil range: Early Eocene–Recent [1] |
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Requiem sharks refers to all members of the family Carcharhinidae: this includes migratory, live-bearing sharks of warm seas (sometimes of brackish or fresh water) such as the tiger shark, the blue shark, the bull shark, and the milk shark. The name comes from the French word for shark, "requin". [2]
Family members have the usual carcharhiniform characteristics. The eyes are round, and the pectoral fins are completely behind the five gill slits. Most species are viviparous, the young being born fully developed. They vary widely in size, from as little as 69 centimetres (2.3 ft) adult length in the Australian sharpnose shark, up to 7.5 metres (25 ft) adult length in the tiger shark.[1]
Requiem sharks are responsible for a large proportion of attacks on humans. However; due to the difficulty in identifying individual species, there is a degree of inaccuracy in attack records.[3]
Contents |
Classification
There are 52 species of requiem shark, grouped into 12 genera:[1]
Family Carcharhinidae
- Subfamily Galeocerdinae
- Genus Galeocerdo - Tiger shark (1 species)
- Subfamily Scoliodontinae
- Genus Scoliodon - Spadenose shark (1 species)
- Subfamily Carcharhininae
- Tribe Carcharhinini
- Tribe Rhizoprionodontini
- Genus Rhizoprionodon - Sharpnose sharks (7 species)
- Genus Loxodon - Sliteye shark (1 species)
- Tribe Isogomphodontini
- Genus Isogomphodon - Daggernose shark (1 species)
- Tribe Triaenodontini
- Genus Triaenodon - Whitetip reef shark (1 species)
Taxonomic note
Carcharhinidae may be a superfamily, divided into Galeocerdidae, Isogomphodontidae, Rhizoprionodontidae, Scoliodontidae, Scoliodontidae, Triaenodontidae, and Carcharhinidae.
Management
In the 1980s, overfishing of sharks began due to a heavy encouragement to fish for them. Since the 1990s, when the problems were realized, regulations have been implemented to prevent the overfishing of sharks in order to rebuild areas of low population and to protect healthy areas of population.
References
- ^ a b c "Carcharhinidae". FishBase. Ed. Rainer Froese and Daniel Pauly. January 2009 version. N.p.: FishBase, 2009.
- ^ "Requiem Shark" by Erik Tierney (accessed 28 November 2007).
- ^ ISAF Statistics on Attacking Species of Shark
External links
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 | WordNet. WordNet 1.7.1 Copyright © 2001 by Princeton University. All rights reserved. Read more |
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| Wikipedia. This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Requiem shark". Read more |
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