Filefish

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Filefish
Stephanolepis hispidus
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Tetraodontiformes
Suborder: Balistoidei
Family: Monacanthidae
Nardo, 1843[1]
Genera[2]

See text

The filefish (Monacanthidae) are a diverse family of tropical to subtropical

trunkfish
.

The filefish family comprises about 102 species in 27 genera. More than half of the species are found in Australian waters, with 58 species in 23 genera.[3]

Their laterally compressed bodies and rough, sandpapery skin inspired the filefish's common name.

Description

Appearing very much like their close relatives the triggerfish, filefish are

caudal peduncle
).

This fan-bellied leatherjacket, Monacanthus chinensis, was photographed in nearshore water, on the northeast coast of Taiwan.

The small terminal mouths of filefish have specialized incisor teeth on the upper and lower jaws. The upper jaw hase four teeth in the inner series and six in the outer series. The lower jaw has four to six in an outer series only. The snout is tapered and projecting, and the eyes are located high on the head. Filefish have rough non-overlapping scales with small spikes, which is why they are called filefish. Although scaled, some filefish have such small scales that they appear scaleless. Like the triggerfish, filefish have small gill openings and greatly elongated pelvic bones, creating a "dewlap" of skin running between the bone's sharply keeled termination and the belly. The pelvis is articulated with other bones of the "pelvic girdle" and is capable of moving upwards and downwards in many species to form a large dewlap, which is used to make the fish appear much deeper in the body than is actually the case. Some filefish erect their dorsal spine and pelvis simultaneously to make removing them from a cave more difficult for predators.

The largest filefish species is the

scrawled filefish (Aluterus scriptus) at up to 110 cm (43 in) in length. Most species are less than 60 cm (24 in) in length. Marked sexual dimorphism
is seen in some species, with the sexes possessing different coloration, different body shapes; the males have larger caudal spines and bristles than females.

Aluterus scriptus grows up to 110 cm (43 in) in length

Habitat and life history

Cantherhines macrocerus

Adult filefish are generally shallow-water fish, inhabiting depths of no more than about 30 m (100 ft). They may be found in lagoons or associated with seaward reefs and seagrass beds; some species may also enter estuaries. Some species are closely associated with dense mats of Sargassum, a particularly ubiquitous "sea weed"; these filefish, notably the plane head filefish (Stephanolepis hispidus), are also coloured and patterned to match their weedy environments.

Either solitary, in pairs, or small groups depending on the species, filefish are not especially good swimmers; their small fins confine the fish to a sluggish pace. Filefish are often observed drifting head downward amongst stands of seaweed,[4] presumably in an effort to fool both predator and prey alike. When threatened, filefish may retreat into crevices in the reef.

The feeding habits of filefish vary among the species, with some eating only

gorgonians, and hydrozoans; and some species eat corals (corallivores). The latter two habits have largely precluded the introduction of filefish into the aquarium
hobby.

Filefish spawn at bottom sites prepared and guarded by the males; both he and the female may guard the brood, or the male alone, depending on the species. The young filefish are

dolphinfish
.

As food

Jwipo (left), Korean dried and flattened filefish

In

FAO fisheries statistics, the largest category of filefish are Cantherhines spp. with annual landings around 200,000 tonnes in recent years, mostly by China. Landings of threadsail filefish (Stephanolepis cirrhifer) and smooth leatherjacket (Meuschenia scaber) are reported at species level, with the rest as "Filefishes, leatherjackets nei" (nei = not elsewhere included).[5]

Threadsail filefish (Stephanolepis cirrhifer) is a popular snack food in Korea. It is typically dried and made into a sweet and salty

jwipo (Korean
: 쥐포), which is then roasted before eating.

Genera

See also

References

Wikimedia Commons has media related to Monacanthidae.
Wikisource has the text of the 1911 Encyclopædia Britannica article "File-fish".
  1. ^ Bailly, N. (2015). "Monacanthidae Nardo, 1843". WoRMS. World Register of Marine Species. Retrieved 2016-01-12.
  2. ^ Matsuura, K. (2014): Taxonomy and systematics of tetraodontiform fishes: a review focusing primarily on progress in the period from 1980 to 2014. Ichthyological Research, 62 (1): 72–113.
  3. ^ Bray, D.J. (2012): Leatherjackets, MONACANTHIDAE, in Fishes of Australia, accessed 26 August 2014, http://www.fishesofaustralia.net.au/home/family/250 Archived 2020-05-21 at the Wayback Machine
  4. ^ Gumanao G.S., A.R. Bos & J.E. Randall (2018). "Seagrass Filefish, Acreichthys tomentosus (Linnaeus), a master of camouflage". Journal of the Ocean Science Foundation. 30: 58–72.
  5. FAO. p. 182. Archived from the original
    (PDF) on 2017-05-19.
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