Wednesday, March 17, 2010

Skates and rays?

What's the difference between a skate and a ray? I used to think that a skate had a rounder body, but then I saw some with round bodies called sting rays. Does it have anything to do with the infamous poisonous barb? Any info. would be great!

Skates and rays?
The primary difference between the two groups of fish are that rays are viviparous (live bearing), while skates are oviparous (egg laying). Skates release their eggs in rectangular cases sometimes called mermaid's purses.





There are also some differences in the teeth (skates usually have many, little teeth, while rays have broad dental plates like interlocked paving stones), and skates usually (but not always) have prominent dorsal fins, while in rays the dorsal fins are usually reduced or absent.





In addition, there are some technical details over the structure of the pelvic girdle and caudal denticles that separate the group.





As far as I know, no skates have a stinger like the stingrays, or the ability to generate electric shocks like the torpedo ray. They do sometimes have spines along their tail though, or thorny projections over their eyes.
Reply:skates are oviparous, they lay eggs


rays are oviviparous, they are born alive
Reply:Rays are flatter.
Reply:Skates and Rays belong to a group known as Batoids. Although they are part of this group, they are not the same. Stingray's have the posionious barb, while skates do not.





Batoids include stingrays, skates, electric rays, guitarfishes and sawfishes.





Batoids are most closely related to sharks and young batoids look very much like young sharks. Indeed according to recent DNA analyses the catshark is more closely related to the batoids than to other
Reply:A skate has a flattened angular body tapering down to a fish like tail. A ray has a flattened angular body tapering down to a whip like tail, many are equipped with a barb at the end of the tail, some of which can inject poison.
Reply:A skate is a ray you are about to eat.



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