The slender fusilier (''Gymnocaesio gymnoptera'') is a

species A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...

of marine

ray-finned fish Actinopterygii (; ), members of which are known as ray-finned fish or actinopterygians, is a class of bony fish that comprise over 50% of living vertebrate species. They are so called because of their lightly built fins made of webbings of sk ...

, a

fusilier ''Fusilier'' is a name given to various kinds of soldiers; its meaning depends on the historical context. While ''fusilier'' is derived from the 17th-century French word – meaning a type of flintlock musket – the term has been used in cont ...

belonging to the family

Lutjanidae Lutjanidae or snappers are a family of perciform fishes, mainly marine but with some members inhabiting estuaries and, in some cases, fresh water (e.g., '' Lutjanus goldiei''). The family includes about 113 species. Most species are used for foo ...

. It is native to

tropical The tropics are the regions of Earth surrounding the equator, where the sun may shine directly overhead. This contrasts with the temperate or polar regions of Earth, where the Sun can never be directly overhead. This is because of Earth's ax ...

reef A reef is a ridge or shoal of rock, coral, or similar relatively stable material lying beneath the surface of a natural body of water. Many reefs result from natural, abiotic component, abiotic (non-living) processes such as deposition (geol ...

s in the

Indian Ocean The Indian Ocean is the third-largest of the world's five oceanic divisions, covering or approximately 20% of the water area of Earth#Surface, Earth's surface. It is bounded by Asia to the north, Africa to the west and Australia (continent), ...

and the western

Pacific Ocean The Pacific Ocean is the largest and deepest of Earth's five Borders of the oceans, oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean, or, depending on the definition, to Antarctica in the south, and is ...

, it is of minor importance to local

commercial fisheries Commercial fishing is the activity of catching fish and other seafood for commercial profit, mostly from wild fisheries. It provides a large quantity of food to many countries around the world, but those who practice it as an industry must often p ...

. This species is the only known member of its

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

Taxonomy

The slender fusilier was first formally described in 1856 as ''Caesio gymnopterus'' by the

Dutch Dutch or Nederlands commonly refers to: * Something of, from, or related to the Netherlands ** Dutch people as an ethnic group () ** Dutch nationality law, history and regulations of Dutch citizenship () ** Dutch language () * In specific terms, i ...

ichthyologist Ichthyology is the branch of zoology devoted to the study of fish, including bony fish (Osteichthyes), cartilaginous fish (Chondrichthyes), and jawless fish (Agnatha). According to FishBase, 35,800 species of fish had been described as of March 2 ...

Pieter Bleeker Pieter Bleeker (10 July 1819 – 24 January 1878) was a Dutch medical doctor, Ichthyology, ichthyologist, and Herpetology, herpetologist. He was famous for the ''Atlas Ichthyologique des Indes Orientales Néêrlandaises'', his monumental work on ...

with the type locality being given as

Ternate Ternate (), also known as the City of Ternate (; ), is the List of regencies and cities of Indonesia, city with the largest population in the province of North Maluku and an island in the Maluku Islands, Indonesia. It was the ''de facto'' provi ...

. In 1876, Bleeker described a new genus, ''Gymnocaesio'' with ''C. gymnopterus'' as its type species by montypy, it is still the only species in that genus. The genus name is a compound of ''gymno'' meaning "naked" and ''caesio '' as in the related genus ''Caesio'' in which this species was originally placed. The

specific name Specific name may refer to: * in Database management systems, a system-assigned name that is unique within a particular database In taxonomy, either of these two meanings, each with its own set of rules: * Specific name (botany), the two-part (bino ...

also uses ''gymno'' as a prefix for ''pterus'' which means fin, a reference to the lack of scales on the

dorsal Dorsal (from Latin ''dorsum'' ‘back’) may refer to: * Dorsal (anatomy), an anatomical term of location referring to the back or upper side of an organism or parts of an organism * Dorsal, positioned on top of an aircraft's fuselage The fus ...

and

anal fin Fins are moving appendages protruding from the body of fish that interact with water to generate thrust and help the fish swim. Apart from the tail or caudal fin, fish fins have no direct connection with the back bone and are supported o ...

s, these are scaled in ''Caesio''.

Description

The slender fusilier has a slender,

fusiform Fusiform (from Latin ''fusus'' ‘spindle’) means having a spindle (textiles), spindle-like shape that is wide in the middle and tapers at both ends. It is similar to the lemon (geometry), lemon-shape, but often implies a focal broadening of a ...

, elongated and moderately laterally compressed body. There are small conical teeth on the maxillae and the vomer while the premaxilla and palatines lack any teeth. The dorsal fin has 10–11 spines and 14–16 soft rays while the anal fin has 3 spines and 11–13 soft rays. There are 20–22

pectoral fin Fins are moving appendages protruding from the body of fish that interact with water to generate thrust and help the fish aquatic locomotion, swim. Apart from the tail or caudal fin, fish fins have no direct connection with the vertebral column ...

rays. The back and upper flanks are bluish green in colour, with centres of scales paler, creating a striped appearance. There is a yellow or brown stripe its widtrgh being roughly equal to a single scale over the

lateral line The lateral line, also called the lateral line organ (LLO), is a system of sensory organs found in fish, used to detect movement, vibration, and pressure gradients in the surrounding water. The sensory ability is achieved via modified epithelia ...

, running for much of the later line's length but running above the lateral line on the

caudal peduncle Fins are moving appendages protruding from the body of fish that interact with water to generate thrust and help the fish swim. Apart from the tail or caudal fin, fish fins have no direct connection with the back bone and are supported only ...

. There is frequently a vivid blue horizontal band directly underneath the lateral line stripe taking up as much as one third of the flanks. The rest of the body is silvery white. The axil of pectoral fin is black and there are black tips to the lobes of the otherwise dusky

caudal fin Fins are moving appendages protruding from the body of fish that interact with water to generate thrust and help the fish swim. Apart from the tail or caudal fin, fish fins have no direct connection with the back bone and are supported only ...

, the rest of the fins are white. This species attains a maximum

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 ...

of .

Distribution and habitat

The slender fusilier is found in the Indian Ocean from the southern

Red Sea The Red Sea is a sea inlet of the Indian Ocean, lying between Africa and Asia. Its connection to the ocean is in the south, through the Bab-el-Mandeb Strait and the Gulf of Aden. To its north lie the Sinai Peninsula, the Gulf of Aqaba, and th ...

to South Africa, eastwards through the Seychelles and

Mascarenes The Mascarene Islands (, ) or Mascarenes or Mascarenhas Archipelago is a group of islands in the Indian Ocean east of Madagascar consisting of islands belonging to the Republic of Mauritius as well as the French department of Réunion. Their na ...

to the Maldives and Laccadives, Sri Lanka and southern India eastwards as far as Fiji in the Pacific Ocean. It extends as far north as Japan and as far south as Papua New Guinea and

New Caledonia New Caledonia ( ; ) is a group of islands in the southwest Pacific Ocean, southwest of Vanuatu and east of Australia. Located from Metropolitan France, it forms a Overseas France#Sui generis collectivity, ''sui generis'' collectivity of t ...

. It occurs in coastal waters in the vicinity of coral reefs at depths down to .

Biology

The slender fusilier has a diet of

zooplankton Zooplankton are the heterotrophic component of the planktonic community (the " zoo-" prefix comes from ), having to consume other organisms to thrive. Plankton are aquatic organisms that are unable to swim effectively against currents. Consequent ...

which it forages for in large midwater aggregations. It frequently joins in mixed species schools with members of the genus ''

Pterocaesio ''Pterocaesio'' is a genus of marine ray-finned fish, fusiliers belonging to the family Lutjanidae. They are native to the Indian Ocean and the western Pacific Ocean. Taxonomy ''Pterocaesio'' was described as a genus in 1876 by the Dutch icht ...

''. It is an

oviparous Oviparous animals are animals that reproduce by depositing fertilized zygotes outside the body (i.e., by laying or spawning) in metabolically independent incubation organs known as eggs, which nurture the embryo into moving offsprings kno ...

species which lays large numbers of small, pelagic eggs.

Fisheries

The slender fusilier has minor importance as a target species for fisheries. It is sometimes caught using

fish traps A fish trap is a trap used for catching fish and other aquatic animals of value. Fish traps include fishing weirs, cage traps, fish wheels and some fishing net rigs such as fyke nets. The use of traps are culturally almost universal arou ...

and

drive-in net A fishing net or fish net is a net used for fishing. Fishing nets work by serving as an improvised fish trap, and some are indeed rigged as traps (e.g. fyke nets). They are usually wide open when deployed (e.g. by casting or trawling), and ...

s. In the Philippines the fish landed are sold as fresh fish while in the Maldives, Laccadives and the Western Pacific it is caught to be used as bait for tuna fishing. In some parts of its range it is overfished.

References

External links

* {{Taxonbar, from1=Q3467380, from2=Q17171881 Lutjaninae Taxa named by Pieter Bleeker Fish described in 1856