Research
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SKATES Images
Rihanna - Take A BowMusic video by Rihanna performing Take A Bow. YouTube view counts pre-VEVO: 66288884. (C) 2008 The Island Def Jam Music Group.
P!nk - Try (The Truth About Love - Live From Los Angeles)Music video by P!nk performing Try (The Truth About Love - Live From Los Angeles). (C) 2012 RCA Records, a division of Sony Music Entertainment.
David Guetta - Just One Last Time ft. Taped Rai"Just One Last Time" feat. Taped Rai. Available to download on iTunes including remixes of : Tiësto, HARD ROCK SOFA & Deniz Koyu http://smarturl.it/DGJustOne...
Steve Jobs vs Bill Gates. Epic Rap Battles of History Season 2.Download This Song: http://bit.ly/KzLBGB Click to Tweet this Vid-ee-oh! http://bit.ly/Nt9lg8 Hi. My name is Nice Peter, and this is EpicLLOYD, and this is th...
MACKLEMORE & RYAN LEWIS - CAN'T HOLD US FEAT. RAY DALTON (OFFICIAL MUSIC VIDEO)Macklemore & Ryan Lewis present the official music video for Can't Hold Us feat. Ray Dalton. Can't Hold Us on iTunes: https://itunes.apple.com/us/album/cant-...
Draw My Life- Jenna MarblesThis video accidentally turned out kind of sad, ME SO SOWWY IT NOT POSED TO BE SAD WHO WANTS HUGS AND COOKIES? Also, FYI for anyone attempting this, it takes...
Draw My Life - Ryan HigaSo i was pretty hesitant to make this video... but after all of your request, here is my Draw My Life video! Check out my 2nd Channel for more vlogs: http://...
Key & Peele: Substitute TeacherA substitute teacher from the inner city refuses to be messed with while taking attendance.
Jack Sparrow (feat. Michael Bolton)Buy at iTunes: http://goo.gl/zv4o9. New album on sale now! http://turtleneckandchain.com.
Katy Perry - Wide AwakeOfficial music video for "Wide Awake," the final chapter from 'Teenage Dream: The Complete Confection' on iTunes: http://smarturl.it/katyperry. Written by Ka...
Harrison Ford Won't Answer Star Wars QuestionsSee Harrison Ford in 42! Go to http://42movie.warnerbros.com/ Jimmy Kimmel Live - Harrison Ford Won't Answer Star Wars Questions Jimmy Kimmel Live's YouTube ...
| Skates Temporal range: Late Cretaceous–Recent [1] |
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| Arctic skate, Amblyraja hyperborea | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Chondrichthyes |
| Subclass: | Elasmobranchii |
| Superorder: | Batoidea |
| Order: | Rajiformes Berg, 1940 |
| Family: | Rajidae Bonaparte, 1831 |
Skates are cartilaginous fish belonging to the family Rajidae in the superorder Batoidea of rays. More than 200 species have been described, in 27 genera. The two subfamilies are Rajinae (hardnose skates) and Arhynchobatinae (softnose skates).
Contents |
Genera [edit]
Skates versus stingrays [edit]
Superficially, skates and stingrays appear somewhat similar.
However, there are fundamental differences.
| Comparison of skates and stingrays | |||
|---|---|---|---|
| Characteristic | Skates | Rays | Sources |
| Reproduction | Stingrays and skates differ primarily in the way they reproduce. Skates are oviparous, that is they lay eggs. Their fertilized eggs are laid in a protective hard case called a mermaid's purse. | Rays are viviparous, that is, they bear their young inside their bodies and give birth to them alive. | [2] |
| Dorsal fin | Distinct | Missing or vestigial | [2] |
| Pelvic fins | Fins are divided into two lobes | Fins have one lobe | [3] |
| Tail | Fleshy tails which lack spines | Whip-like with one or two stinging spines | [2][3] |
| Protection | Rely on "thorny projections on their backs and tails for protection from predators" | Rely on their stinging spines or barbs for protection | [2] |
| Teeth | Small | "Plate-like teeth adapted for crushing prey" | [2] |
| Size | Usually smaller than rays | Usually larger than skates | [2] |
| Colour | Often drab, brown or gray (but not always) | Often boldly patterned (but not always) | [3] |
| Habitat | Often deep water (but not always) | Often shallow water (but not always) | [3] |
Conservation [edit]
Skates have slow growth rates and, since they mature late, low reproductive rates. As a result, skates are vulnerable to overfishing and appear to have been overfished and are suffering reduced population levels in many parts of the world. The barndoor skate, Raja laevis, is currently listed with the IUCN as vulnerable due to being severely overfished.[4] However, population data are lacking to determine the exploitation of the big skate at this time.[citation needed]
In 2010, Greenpeace International added the barndoor skate, bottlenose skate, spotback skate, and maltese skate to its seafood red list. "The Greenpeace International seafood red list is a list of fish that are commonly sold in supermarkets around the world, and which have a very high risk of being sourced from unsustainable fisheries."[5]
Gallery [edit]
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New Zealand smooth skate
(Tony Ayling) -
A skate, half-buried beneath the sand
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Uncooked skate wing
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A cut-away view of a skate egg case
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Big skate egg cases; egg case on the left is fresh and older ones are to the right
.gif)
See also [edit]
- Jenny Haniver, a fake sea monster created from a skate corpse
- Mokpo city of South Korea is famous for its skate cuisine.
References [edit]
- ^ Froese, Rainer, and Daniel Pauly, eds. (2009). "Rajidae" in FishBase. January 2009 version.
- ^ a b c d e f Ichthyology: Ray and Skate Basics Florida Museum of Natural History. Retrieved 21 March 2013.
- ^ a b c d Skate or Ray? ReefQuest Centre for Shark Research. Retrieved 212 March 2013.
- ^ Florida Museum of Natural History
- ^ Greenpeace International Seafood Red list
External links [edit]
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Wikispecies has information related to: Rajidae |
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Wikimedia Commons has media related to: Rajidae |
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Look up skate in Wiktionary, the free dictionary. |
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Wikibooks Cookbook has a recipe/module on |
- ARKive - images and movies of the common skate (Dipturus batis)
- Kliman, Todd. "Skate Goes From Trash Fish to Treasure", Washingtonian, May 1, 2006.
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This Rajiformes article is a stub. You can help Wikipedia by expanding it. |
