Spearfish remora

Spearfish remora
Drawing by Dr Tony Ayling
Scientific classification
Kingdom:Animalia
Phylum:Chordata
Class:Actinopterygii
Order:Perciformes
Family:Echeneidae
Genus:Remora
Species: R. brachyptera
Binomial name
Remora brachyptera
(R. T. Lowe, 1839)
Synonyms
  • Echeneis brachyptera R. T. Lowe, 1839
  • Echeneis sexdecimlamellata Eydoux & Gervais, 1837
  • Echeneis quatuordecimlaminatus D. H. Storer, 1839
  • Echeneis pallida Temminck & Schlegel, 1850
  • Echeneis nieuhofii Bleeker, 1853

The spearfish remora (Remora brachyptera) is a species of remora with a worldwide distribution in tropical and subtropical seas. Remoras attach themselves to other fish with a sucker on the head and this fish is almost exclusively found living on billfishes or swordfishes, and sometimes on sharks.

Description

This species can reach 50 cm (20 in) in total length, though most do not exceed 25 cm (10 in).[2] It is an elongated cylindrical fish, usually whitish or pale blue in life, but tan or dusky-brown when dead. The rather flattened head has an oblong disc or sucker with 14 to 17 transverse plates with which it clings to its host. The dorsal and anal fins are long and set far back on the body. The dorsal fin has between 27 and 34 soft rays, the pectoral fin has 23 to 27 rays and the anal fin 25 to 34 rays. The caudal fin has a straight edge. The sucker reaches no further than the pectoral fins, and the outer two-thirds of the pectoral rays are flexible. There are up to 21 gill rakers in the first branchial arch.[2][3][4]

Biology

The spearfish remora attaches itself with its disc to a host fish, with juveniles often attaching in the gill chambers.[1] Host fish include the sailfish, the white marlin, the black marlin, the striped marlin and the swordfish; all these fish swim faster than does the remora, and it is not clear how the remora attaches to the host in the first place.[5] The remora can move about the body surface of its host and is capable of short bursts of independent swimming. The diet includes parasitic copepods removed from the body of the host, but these do not seem to form such a large percentage of the diet of the spearfish remora as it does for the common remora (Remora remora). Although more than one remora can attach to a single host, it is not clear how remoras come together to breed.[5]

References

  1. 1 2 Collette, B.B. 2010. Remora brachyptera. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. www.iucnredlist.org. Downloaded on 1 July 2013.
  2. 1 2 Froese, Rainer and Pauly, Daniel, eds. (2013). "Remora brachyptera" in FishBase. April 2013 version.
  3. ↑ Hureau, J.-C. "Spearfish remora (Remora brachyptera)". Fishes of the NE Atlantic and the Mediterranean. Marine Species Identification Portal. Retrieved 18 September 2015.
  4. ↑ Bray, Dianne J. (2011). "Spearfish Remora, Remora brachyptera". Fishes of Australia. Retrieved 18 September 2015.
  5. 1 2 Cressey, Roger F.; Lachner, Ernest A. (1970). "The Parasitic Copepod Diet and Life History of Diskfishes (Echeneidae)". Copeia. 2: 310–318. doi:10.2307/1441652.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.