Southern eagle ray | |
---|---|
Southern eagle ray (Myliobatis goodei) | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Chondrichthyes |
Subclass: | Elasmobranchii |
Superorder: | Batoidea |
Order: | Myliobatiformes |
Family: | Myliobatidae |
Genus: | Myliobatis |
Species: | M. goodei |
Binomial name | |
Myliobatis goodei Garman, 1885 | |
The Southern eagle ray (Myliobatis goodei), sometimes known as the Southern eagle fish or the rockfish, [2] is a ray species in the family Myliobatidae. It lives in waters just off of the Atlantic coast, from the tip of Florida down to Argentina, inhabiting estuaries or bays to give birth during spring and summer and migrating to the open sea in autumn and winter. It has an average width of 99 centimeters, and a length of 60 centimeters. It is often confused with the bullnose ray, a related species in the genus Myliobatis , due to the two species' similarities in appearance.
Samuel Garman described the southern eagle ray in 1885. [3]
The Southern eagle ray lives on various parts of the Atlanta coast. Sightings have been reported from the coast of Southern Mexico all the way down to Argentina, as well as on the coast of Florida. The specific countries that the Southern eagle ray is native to are Argentina, Belize, Brazil, Colombia, Costa Rica, French Guiana, Guyana, Honduras, Mexico, Nicaragua, Panama, Suriname, United States, Uruguay, and Venezuela. A sighting was also reported in the island of Maldives in August 2012, and then three more were reported in Australia. [4]
The Southern eagle ray lives in shallow waters, mostly under 100 meters, but it can live in depths of up to 200 meters. [1] This is a significant contrast from the bullnose ray, which most commonly lives in depths of no more than 10 meters. [5] It is benthopelagic, feeding in and inhabiting the areas just above the ocean floor, typically in brackish water. It prefers waters with a soft seabed, composed of elements such as mud, sand, or sea grass. [6]
The Southern eagle ray's average length is 80 cm (31.5 in), but some specimens have reached up to 125 cm (49 in). [3] The species is somewhat wider than it is long, with its disc being an average of 99 cm (39 in) wide. [1] It does not have spines on its disc. The Southern eagle ray usually has a dark brown colored upper side, while most of its underside is a light shade of brown or white, with the outer edges often being darker. [6]
The Southern eagle ray's appearance is similar to that of the bullnose ray, causing the two to often be confused. [7] The following table shows the similarities and differences between the two related species:
M. goodei (Southern eagle ray) | M. freminvillei (bullnose ray) | |
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Image | ||
Dorsal fin [6] | Located well behind the pelvic fin | Located close to the pelvic fin |
Disc [8] | Rounded corners | Sharper corners |
Tail | Thin, roughly the same length as its disc | Thin, roughly the same length as its disc |
Average width of disc | About 100 centimeters | Less than 90 centimeters |
Average length of disc | About 80 centimeters | About 70 centimeters [9] |
The Southern eagle ray is a carnivore, mostly feeding on small invertebrates, such as shrimp, crabs, and gastropods. [6]
The Southern eagle ray migrates seasonally. Adults inhabit the open sea during the autumn and winter, and return to their home location, which is usually an estuary or a bay, in the spring and summer, to give birth. The young that are born in summer usually wait until the end of the next summer before they migrate into the open waters, while those who are born in spring do this after the first summer passes. They then return to their home location again in the spring and summer, to give birth themselves. Little else is known about the ecology and reproduction of the Southern eagle ray. [10] [11]
The Southern eagle ray exhibits ovoviviparity, meaning that the eggs remain inside the mother's body until they are ready to hatch. Embryos feed on yolk when they are first developed. As they develop further, they start receiving nourishment by absorbing uterine fluid from their mother instead. [12] [7]
The Southern eagle ray is a rather common species, much more abundant than the bullnose ray. The species is caught by fisheries, sometimes intentionally but often as a bycatch. IUCN currently lists it as vulnerable. There are currently no conservation measures in place for this species. [1]
The Southern eagle ray is often caught intentionally in fishing nets by artisanal fisheries. It is also quite often a bycatch component for trawl fisheries, especially in Caribbean South America and parts of Brazil. It is thought that this may eventually lead to its population declining in certain regions. It is also commonly caught in Venezuela, most often as a bycatch component. The number of reported catches of this species in Venezuela has increased greatly over the years, particularly throughout the 1980s and 1990s. The Southern eagle ray is also a common bycatch of various fisheries in southern Brazil, due to intensive fishing activities. Other batoids are commonly caught in this area as well. Although the intensive fishing has caused a significant decline in many batoid species, it is unknown how this affects eagle rays. [1]
The Southern eagle ray has several parasites that infect it. [3] [12]
The dusky smooth-hound, also called the smooth dogfish or the dog shark, is a species of houndshark in the family Triakidae. This shark is an olive grey or brown in color, and may have shades of yellow or grayish white. Females live to 16 years and males have a lifespan of 10 years. M. canis was the first shark recognised to have viral infections.
The bonnethead, also called a bonnet shark or shovelhead, is a small member of the hammerhead shark genus Sphyrna, and part of the family Sphyrnidae. It is an abundant species in the littoral zone of the North Atlantic and the Gulf of Mexico, is the only shark species known to display sexual dimorphism in the morphology of the head, and is the only shark species known to be omnivorous.
Myliobatis is a genus of eagle rays in the family Myliobatidae.
The New Zealand eagle ray or Australian eagle ray is an eagle ray of the family Myliobatidae, found in bays, estuaries, and near rocky reefs around New Zealand and southern Australia on the inner continental shelf. It is a common species and the International Union for Conservation of Nature has assessed its conservation status as being of "least concern".
The finetooth shark is a species of requiem shark, in the family Carcharhinidae, found in the western Atlantic Ocean, from North Carolina to Brazil. It forms large schools in shallow, coastal waters, and migrates seasonally following warm water. A relatively small, slender-bodied shark, the finetooth shark can be identified by its needle-like teeth, dark blue-gray dorsal coloration, and long gill slits. It attains a maximum length of 1.9 m (6.2 ft). The diet of this species consists primarily of small bony fishes, in particular menhaden. Like other members of its family, it is viviparous with females giving birth to two to six pups in estuarine nursery areas every other year.
The night shark is a species of requiem shark, in the family Carcharhinidae, found in the temperate and tropical waters of the Atlantic Ocean. An inhabitant of the outer continental shelf and upper continental slope, this shark most commonly occurs at depths of 50–600 m (160–1,970 ft) and conducts a diel vertical migration, spending the day in deeper water and moving into shallower waters at night. Off northeastern Brazil, large numbers congregate around seamounts of varying depths. A slender, streamlined species, the night shark typically reaches a length of 2 m (6.6 ft). It can be identified by its long, pointed snout and large, green eyes, and is dark grayish blue or brown above and white below.
The Caribbean sharpnose shark is a requiem shark, and part of the family Carcharhinidae.
The Atlantic stingray is a species of stingray in the family Dasyatidae, common along the Atlantic coast of North America from Chesapeake Bay to Mexico, including brackish and freshwater habitats. It may be distinguished from other stingrays in the area by its relatively elongated snout. This species is of little commercial importance, other than for sale in the aquarium industry.
The narrowfin smooth-hound or Florida smooth-hound is a houndshark of the family Triakidae. It is found on the continental shelves of the subtropical western Atlantic, from Florida and the northern Gulf of Mexico to Venezuela, and also southern Brazil, between latitudes 32° N and 36° S, from the surface to a depth of 100 m. It can grow up to a length of 1.1 m.
The spotted eagle ray is a cartilaginous fish of the eagle ray family, Aetobatidae. As traditionally recognized, it is found globally in tropical regions, including the Atlantic, Pacific and Indian Oceans. Recent authorities have restricted it to the Atlantic with other populations recognized as the ocellated eagle ray and Pacific white-spotted eagle ray. Spotted eagle rays are most commonly seen alone, but occasionally swim in groups. They are ovoviviparous, the female retaining the eggs then releasing the young as miniature versions of the parent.
The thintail skate is a species of fish in the family Rajidae. It is endemic to Brazil. Its natural habitat is open seas.
The purple eagle ray is a species of fish in the family Myliobatidae. It was formerly considered endemic to Australia but is now known to be more widespread. Its natural habitat is the open seas where it has a patchy distribution, and the International Union for Conservation of Nature has assessed its conservation status as being "near-threatened".
The longnose eagle ray or snouted eagle ray is a species of fish in the family Myliobatidae. It is found in the East Pacific Ocean from Baja California and the Gulf of California to Sechura, Peru, ranging from shallow water to a depth of 64 m (210 ft). This species was first described in 1964 by the American ichthyologist Shelton Pleasants Applegate, who was an expert on fossil and living sharks, and by American marine biologist John Edgar Fitch.
The Brazilian cownose ray, also commonly called the Ticon cownose ray, is a species of fish in the family Rhinopteridae. Its range extends along the coast from the southern tip of Brazil to western Florida. Its natural habitats are shallow seas, estuarine waters, and intertidal flats.
The shortnose guitarfish is a species of fish in the Trygonorrhinidae family found in the southwest Atlantic in coastal parts near sandy sea floors of southern Brazil, through Uruguay, to northeast Argentina. It reaches a length of 66 cm (2.17 ft). Their diet consist of Crabs, worms, clams and small fishes. The guitarfish has become critically endangered because of the rapid decline caused by overfishing.
The common eagle ray or bullray is a species of fish in the family Myliobatidae. It inhabits the eastern Atlantic Ocean, the Mediterranean Sea and the south-western Indian Ocean.
The shortnose eagle ray is a species of eagle ray that lives in the southwestern Atlantic Ocean off Brazil, Uruguay and Argentina.
The bullnose ray is an eagle ray, which is widely distributed in the western Atlantic. It is found at depth above 10 m (33 ft) in coastal waters from Cape Cod down to Argentina, but is absent from parts of the western central Atlantic. It reaches a maximum size of 106 cm (42 in) in disc width and gives birth to six young per litter. It is often confused with the southern eagle ray. The bullnose ray feeds mostly hermit crabs, gastropods, and bivalves.
The Japanese eagle ray, also known as the cowhead eagle ray or kite ray is a ray species in the family Myliobatidae.
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