Skate Characteristics and Information

Socotran skate
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Skates are a type of cartilaginous fish that have a flat body and wing-like pectoral fins attached to their head. If you can picture a stingray, you know basically what a skate looks like.

There are dozens of species of skates. According to the Florida Museum of Natural History, the common skate is the largest skate species - it can reach over 8 feet in length. At only about 30 inches, the starry skate is the smallest skate species.

Description

Like stingrays, skates have a long, whip-like tail and breathe through spiracles. Breathing through spiracles allows the skate to rest on the ocean bottom and get oxygenated water through openings in their head, rather than breathing in water and sand from the ocean bottom. Skates may also have a prominent dorsal fin (or two fins) near the end of their tail, while rays usually do not.

While many fish propel themselves by flexing their bodies and using their tail, skates move by flapping their winglike pectoral fins. Unlike stingrays, skates do not have a venomous spine in their tail.

Classification

Skates are a type of cartilaginous fish. They are classified in the order Rajiformes, which contains a dozen families, including the families Anacanthobatidae and Rajidae, which include skates and smooth skates.

Feeding

Skates eat shellfish, worms, and crabs.

They have strong teeth and jaws, allowing them to easily crush shells.

Habitat and Distribution

Skates live throughout the world. Skates spend most of their time on the ocean bottom.

Reproduction

Reproduction is another way that skates differ from rays. Skates bear their young in eggs, while rays bear live young.

Thus, skates are oviparous. With rays, the young develop in eggs that are retained in mother's body, thus they are ovoviviparous.

Skates mate at the same nursery grounds each year. Male skates have claspers that they use to transmit sperm to the female, and eggs are fertilized internally. The eggs develop into a capsule called an egg case - or more commonly, a 'mermaid's purse' - and then are deposited onto the ocean floor. These mermaids purses sometimes wash up on beaches. The egg cases may sit on the ocean floor, or attach to seaweeds.

Inside the egg case, a yolk nourishes the embryos. The young may remain in the egg case for up to 15 months, and then hatch looking like miniature adult skates.

Conservation and Human Uses

Skates are harmless to humans.

Skates are commercially harvested for their wings, which are considered tasty (Skate Wing With Butter, anyone?). The flesh of a skate's wing is said to be similar to the taste and texture of scallops. They are usually harvested using otter trawls.

Skate wings can also be used for lobster bait, and to make fish meal and pet food.

In addition to commercial fisheries, skates may also be caught as bycatch

Some U.S. skate species, such as the thorny skate, are considered overfished, and management plans are in place in the U.S. to protect skate populations through methods such as fishing trip limits, and possession prohibitions.

Skate Species

Below are some examples of skate species found in the U.S.:

  • Barndoor Skate (Dipturus laevis)
  • Big Skate (Raja binoculata)
  • Longnose Skate (Raja rhina)
  • Thorny Skate (Amblyraja radiata)
  • Winter Skate (Leucoraja ocellata)
  • Little Skate (Leucoraja erinacea)

References and Further Information

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Your Citation
Kennedy, Jennifer. "Skate Characteristics and Information." ThoughtCo, May. 10, 2017, thoughtco.com/skate-fish-profile-2291587. Kennedy, Jennifer. (2017, May 10). Skate Characteristics and Information. Retrieved from https://www.thoughtco.com/skate-fish-profile-2291587 Kennedy, Jennifer. "Skate Characteristics and Information." ThoughtCo. https://www.thoughtco.com/skate-fish-profile-2291587 (accessed December 15, 2017).