The spearfish remora (''Remora brachyptera'') is a species of

remora The remora (), sometimes called suckerfish or sharksucker, is any of a family (Echeneidae) of ray-finned fish in the order Carangiformes. Depending on species, they grow to long. Their distinctive first dorsal fins take the form of a modified ...

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

billfish The billfish are a group (Xiphioidea) of saltwater fish, saltwater predatory fish characterised by prominent pointed beak, bills (rostrum (anatomy), rostra), and by their large size; some are longer than . Extant billfish include sailfish and m ...

es or

swordfish The swordfish (''Xiphias gladius''), also known as the broadbill in some countries, are large, highly migratory predatory fish characterized by a long, flat, pointed bill. They are the sole member of the Family (biology), family Xiphiidae. They ...

es, and sometimes on

shark Sharks are a group of elasmobranch cartilaginous fish characterized by a ribless endoskeleton, dermal denticles, five to seven gill slits on each side, and pectoral fins that are not fused to the head. Modern sharks are classified within the ...

Description

This species can reach in

total length Fish measurement is the measuring of individual fish and various parts of their anatomies, for data used in many areas of ichthyology, including taxonomy and fishery biology. Overall length Standard length (SL) is the length of a fish measured f ...

, though most do not exceed . 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 A host is a person responsible for guests at an event or for providing hospitality during it. Host may also refer to: Places * Host, Pennsylvania, a village in Berks County * Host Island, in the Wilhelm Archipelago, Antarctica People * ...

. 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.

Biology

The spearfish remora attaches itself with its disc to a host fish, with juveniles often attaching in the gill chambers. Host fish include the

sailfish The sailfish is one or two species of marine fish in the genus ''Istiophorus'', which belong to the family Istiophoridae ( marlins). They are predominantly blue to gray in colour and have a characteristically large dorsal fin known as the ...

, the

white marlin The white marlin (''Tetrapterus albida/Kajikia albida''), also known as Atlantic white marlin, marlin, skilligalee, is a species of billfish that lives in the epipelagic zone of the tropical and subtropical Atlantic Ocean. They are found between t ...

, the black marlin, the striped marlin and the

; 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. 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.

References

External links

Photograph
{{DEFAULTSORT:remora, spearfish spearfish remora Cosmopolitan fish Taxa named by Richard Thomas Lowe spearfish remora