Southern eagle ray

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Southern eagle ray
Southern eagle ray (Myliobatis goodei)
Scientific classification Edit this 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,

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.

Taxonomy

Samuel Garman described the southern eagle ray in 1885.[3]

Distribution and habitat

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.

sea grass.[6]

Description

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]

Comparison with the bullnose ray

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)
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]

Behavior

The Southern eagle ray is a carnivore, mostly feeding on small invertebrates, such as

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]

Reproduction

The Southern eagle ray exhibits

uterine fluid from their mother instead.[12][7]

Population, conservation, and status

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]

Parasites

The Southern eagle ray has several parasites that infect it.[3][12]

References

  1. ^
    doi:10.2305/IUCN.UK.2020-3.RLTS.T161436A888243.en. Retrieved 13 November 2021.{{cite journal}}: CS1 maint: multiple names: authors list (link
    )
  2. ^ "Myliobatis goodei (Southern eagle fish; Southern eagle ray; rockfish)". MCZBASE:The Database of the Zoological Collections. Retrieved 21 April 2018.
  3. ^ a b c Froese, R.; D., Pauly. "Myliobatis goodei Garman, 1885". WoRMS. Retrieved 14 April 2018.
  4. ^ "Occurrence search". GBIF. Retrieved 21 April 2018.
  5. doi:10.2305/IUCN.UK.2021-2.RLTS.T161568A201183089.en. Retrieved 13 November 2021.{{cite journal}}: CS1 maint: multiple names: authors list (link
    )
  6. ^ a b c d "Species: Myliobatis goodei, Southern eagle ray". Smithsonian Tropical Research Institute. Retrieved 21 April 2018.
  7. ^ a b Froese, Rainer. "Myliobatis goodei, Southern eagle ray". FishBase. Retrieved 14 April 2018.
  8. ISBN 978-0-395-97515-2
    . Retrieved 22 April 2018.
  9. ^ Luna, Susan M.; Bailly, Nicolas. "Myliobatis freminvillei, Bullnose eagle ray". FishBase. Retrieved 22 April 2018.
  10. hdl:11336/7418
    .
  11. PMID 27221505
    .
  12. ^ a b "Myliobatis goodei GARMAN, 1885". Shark-References. World Wide Web electronic publication. Retrieved 21 April 2018.
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