The vermiculated spinefoot (''Siganus vermiculatus''), also known as maze rabbitfish, scribbled spinefoot or vermiculate rabbitfish, is a species of marine

ray-finned fish Actinopterygii (; ), members of which are known as ray-finned fishes, is a class of bony fish. They comprise over 50% of living vertebrate species. The ray-finned fishes are so called because their fins are webs of skin supported by bony or hor ...

, a

rabbitfish Rabbitfishes or spinefoots are perciform fishes in the family Siganidae. The 29 species are in a single genus, ''Siganus''. In some now obsolete classifications, the species having prominent face stripes—colloquially called foxfaces– ...

belonging to the

family Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ...

Siganidae Rabbitfishes or spinefoots are perciform fishes in the family Siganidae. The 29 species are in a single genus, ''Siganus''. In some now obsolete classifications, the species having prominent face stripes—colloquially called foxfaces– ...

. Like all rabbitfishes, it has venomous spines on the dorsal, anal, and pelvic fins. It is a reef associated fish species of the

Indo-West Pacific The Indo-Pacific is a vast biogeographic region of Earth. In a narrow sense, sometimes known as the Indo-West Pacific or Indo-Pacific Asia, it comprises the tropical waters of the Indian Ocean, the western and central Pacific Ocean, and the ...

region. It is a common commercially important fish in many tropical countries.

Taxonomy

The vermiculated spinefoot was first formally described in 1835 as ''Amphacanthus vermiculatus'' by the French

zoologist Zoology ()The pronunciation of zoology as is usually regarded as nonstandard, though it is not uncommon. is the branch of biology that studies the Animal, animal kingdom, including the anatomy, structure, embryology, evolution, Biological clas ...

Achille Valenciennes Achille Valenciennes (9 August 1794 – 13 April 1865) was a French zoologist. Valenciennes was born in Paris, and studied under Georges Cuvier. His study of parasitic worms in humans made an important contribution to the study of parasitology. ...

with the type locality given as

New Guinea New Guinea (; Hiri Motu Hiri Motu, also known as Police Motu, Pidgin Motu, or just Hiri, is a language of Papua New Guinea, which is spoken in surrounding areas of Port Moresby (Capital of Papua New Guinea). It is a simplified version of ...

. The specific name ''vermiculatus'' refers to the vermiculated or maze pattern on the bodies of the living fish.

Description

The vermiculated spinefoot has a deep and laterally compressed body which has a depth which fits 1.9 to 2.2 times into its

standard length Fish measurement is the measuring of individual fish and various parts of their anatomies. These data are used in many areas of ichthyology, including taxonomy and fisheries biology. Overall length * Standard length (SL) is the length of a fish m ...

. The nape is bulging with a slight indentation above each eye. The deep, blunt snout also bulges. The front nostril has a flange which is slightly widened to its rear. There is a recumbent spine to the front of the

dorsal fin A dorsal fin is a fin located on the back of most marine and freshwater vertebrates within various taxa of the animal kingdom. Many species of animals possessing dorsal fins are not particularly closely related to each other, though through conv ...

. Like all rabbitfishes, the dorsal fin has 13 spines and 10

soft rays Fish anatomy is the study of the form or morphology of fish. It can be contrasted with fish physiology, which is the study of how the component parts of fish function together in the living fish. In practice, fish anatomy and fish physiology co ...

, while the

anal fin Fins are distinctive anatomical features composed of bony spines or rays protruding from the body of a fish. They are covered with skin and joined together either in a webbed fashion, as seen in most bony fish, or similar to a flipper, as se ...

has 7 spines and 9 soft rays. The fin spines hold venom glands. The

caudal fin Fins are distinctive anatomical features composed of bony spines or rays protruding from the body of a fish. They are covered with skin and joined together either in a webbed fashion, as seen in most bony fish, or similar to a flipper, as se ...

is emarginate. This species attains a maximum total length of , although is more typical. The body is covered in a grey and whitish complex maze-like or reticulate pattern with a patch of yellow on the head and spots on the caudal fin.

Distribution and habitat

The vermiculated spinefoot is found from southern India and Sri Lanka eastwards into the western Pacific Ocean as far east as

Palau Palau,, officially the Republic of Palau and historically ''Belau'', ''Palaos'' or ''Pelew'', is an island country and microstate in the western Pacific. The nation has approximately 340 islands and connects the western chain of the Caro ...

and

Guam Guam (; ch, Guåhan ) is an organized, unincorporated territory of the United States in the Micronesia subregion of the western Pacific Ocean. It is the westernmost point and territory of the United States (reckoned from the geographic cent ...

, south to Vanuatu, Fiji and New Caledonia and Australia. In Australia it has been reported from

Darnley Island Darnley Island or ''Erub'' in the native Papuan language, Meriam Mir, is an island formed by volcanic action and situated in the eastern section of the Torres Strait, Queensland, Australia. It is one of the Torres Strait Islands and is loc ...

and

Townsville Townsville is a city on the north-eastern coast of Queensland, Australia. With a population of 180,820 as of June 2018, it is the largest settlement in North Queensland; it is unofficially considered its capital. Estimated resident population, 3 ...

in northern

Queensland ) , nickname = Sunshine State , image_map = Queensland in Australia.svg , map_caption = Location of Queensland in Australia , subdivision_type = Country , subdivision_name = Australia , established_title = Before federation , established_ ...

but its presence in Australian waters needs to be confirmed. It is found in shallow, coastal waters, especially estuaries. Both adults and juveniles are commonest shallow, sediment-laden waters in

mangroves A mangrove is a shrub or tree that grows in coastal saline or brackish water. The term is also used for tropical coastal vegetation consisting of such species. Mangroves are taxonomically diverse, as a result of convergent evolution in several ...

, following the tide in and out. Adults are occasionally encountered in clear water in the vicinity of reefs or above sandy substrates.

Biology

The vermiculated spinefoot browses algae which is growing on seagrass, the roost of mangrove and on rocks. The adults gather in aggregations of several hundred individuals to spawn in the summer, the pawn in pairs laying eggs which adhere to the substrate. The lunar cycle governs spawning behaviour. This species produces

venom Venom or zootoxin is a type of toxin produced by an animal that is actively delivered through a wound by means of a bite, sting, or similar action. The toxin is delivered through a specially evolved ''venom apparatus'', such as fangs or a sti ...

in the spines of its fins. In a study of the venom of a congener it was found that rabbitfish venom was similar to the venom of stonefishes.

Fisheries

The vermiculated spinefoot is a large fast growing species and is sold fresh in markets in India, Sri Lanka and Fiji where it commpans premium prices. They are caught using nets and fixed traps.

References

Animaldiversity WebScience direct

External links

* {{Taxonbar, from=Q2555491 Fish of Thailand Siganidae Fish described in 1835 Taxa named by Achille Valenciennes