The shortnose gar (''Lepisosteus platostomus'') is a primitive freshwater fish of the family

Lepisosteidae Gars are an ancient group of ray-finned fish in the Family (biology), family Lepisosteidae. They comprise seven living species of fish in two genera that inhabit Fresh water, fresh, Brackish water, brackish, and occasionally marine waters of eas ...

. It is native to the United States where its range includes the Mississippi and Missouri River basins, ranging from Montana to the west and the Ohio River to the east, southwards to the

Gulf Coast The Gulf Coast of the United States, also known as the Gulf South or the South Coast, is the coastline along the Southern United States where they meet the Gulf of Mexico. The coastal states that have a shoreline on the Gulf of Mexico are Tex ...

. It inhabits calm waters in large rivers and their backwaters, as well as oxbow lakes and large pools. It is a long, slender fish, brown or olive green above and whitish below. It typically grows to about and is armored by rows of interlocking, rhomboidal

ganoid scale A fish scale is a small rigid plate that grows out of the skin of a fish. The skin of most jawed fishes is covered with these protective scales, which can also provide effective camouflage through the use of reflection and colouration, as w ...

s. The shortnose gar is an

ambush predator Ambush predators or sit-and-wait predators are carnivorous animals that capture their prey via stealth, luring or by (typically instinctive) strategies utilizing an element of surprise. Unlike pursuit predators, who chase to capture prey u ...

, feeding mostly on fish, but also consuming crustaceans, insects, and other invertebrates. Breeding takes place in spring when females, often accompanied by several males, attach their eggs to clumps of submerged vegetation. The eggs, which are toxic to man, hatch after a week or so. After consuming their yolk sac, the young fish feed on insect larvae and small crustaceans, maturing at an age of about three years.

Description

Shortnose gar have a prehistoric-looking appearance. Like many other "lie-in-wait" predators, they have an elongated, torpedo-like body with an elongated head containing one row of sharp,

conical In geometry, a cone is a three-dimensional figure that tapers smoothly from a flat base (typically a circle) to a point not contained in the base, called the ''apex'' or '' vertex''. A cone is formed by a set of line segments, half-lines, ...

teeth. Similar to many

Paleozoic The Paleozoic ( , , ; or Palaeozoic) Era is the first of three Era (geology), geological eras of the Phanerozoic Eon. Beginning 538.8 million years ago (Ma), it succeeds the Neoproterozoic (the last era of the Proterozoic Eon) and ends 251.9 Ma a ...

and

Mesozoic The Mesozoic Era is the Era (geology), era of Earth's Geologic time scale, geological history, lasting from about , comprising the Triassic, Jurassic and Cretaceous Period (geology), Periods. It is characterized by the dominance of archosaurian r ...

actinopterygians 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 skin ...

, their bodies are covered in rows of interlocking, rhomboidal

s that create an exceptionally protective, yet flexible armor around the fish.
Short-nosed Gar - zen gyotaku. The

dorsal fin A dorsal fin is a fin on the back of most marine and freshwater vertebrates. Dorsal fins have evolved independently several times through convergent evolution adapting to marine environments, so the fins are not all homologous. They are found ...

is located posterior nearly directly above the

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 ...

and very near the large

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 ...

. Shortnose gar vary in color, changing from brown/olive green on the dorsal surface to yellow on the sides and white on the underbelly. Shortnose gar can be discerned from other gar species in that they lack the upper jaw of the

alligator gar The alligator gar (''Atractosteus spatula'') is a euryhaline ray-finned fish in the clade Ginglymodi of the infraclass Holostei , being most closely related to the bowfins. It is the largest species in the gar family (biology), family (Lepisost ...

, the long snout of the

longnose gar The longnose gar (''Lepisosteus osseus''), also known as longnose garpike or billy gar, is a ray-finned fish in the family Lepisosteidae. The genus may have been present in North America for about 100 million years. References are made to gar ...

, and the markings of the

spotted gar The spotted gar (''Lepisosteus oculatus'') is a freshwater fish native to North America that has an abundance of dark spots on its head, fins, and dart-like body. Spotted gar have an elongated mouth with many needle-like teeth to catch other fis ...

.Shortnose Gar - Montana Field Guide.
/ref> The shortnose gar reaches up to , but a more common length is .

Habitat

Shortnose gar generally inhabit calm waters in large rivers and their backwaters, as well as

oxbow lake An oxbow lake is a U-shaped lake or stream pool, pool that forms when a wide meander of a river is meander cutoff, cut off, creating a free-standing body of water. The word "oxbow" can also refer to a U-shaped bend in a river or stream, whether ...

s and large, quiet pools, typically around vegetation or downed logs.
Short-nosed Gar - Warner Nature Center. Gar have the ability to survive in environments with very little oxygen and especially

turbid Turbidity is the cloudiness or haziness of a fluid caused by large numbers of individual particles that are generally invisible to the naked eye, similar to smoke in air. The measurement of turbidity is a key test of both water clarity and wate ...

conditions because of their specialized

gas bladder The swim bladder, gas bladder, fish maw, or air bladder is an internal gas-filled organ in bony fish that functions to modulate buoyancy, and thus allowing the fish to stay at desired water depth without having to maintain lift via swimming, ...

. Gar gas bladders have the ability to function like a

lung The lungs are the primary Organ (biology), organs of the respiratory system in many animals, including humans. In mammals and most other tetrapods, two lungs are located near the Vertebral column, backbone on either side of the heart. Their ...

to extract and use oxygen from swallowed air in addition to regulating

buoyancy Buoyancy (), or upthrust, is the force exerted by a fluid opposing the weight of a partially or fully immersed object (which may be also be a parcel of fluid). In a column of fluid, pressure increases with depth as a result of the weight of t ...

Reproduction and lifecycle

Shortnose gar typically spawn in the spring during April, May, and June, when water temperatures are between . Often accompanied by more than one male, females scatter large, yellowish-green eggs in quiet, shallow water among submerged vegetation or other underwater structures. A sticky

adhesive Adhesive, also known as glue, cement, mucilage, or paste, is any non-metallic substance applied to one or both surfaces of two separate items that binds them together and resists their separation. The use of adhesives offers certain advantage ...

holds the eggs together in clumps, where they hatch after eight to 9 days. The eggs are poisonous to

birds Birds are a group of warm-blooded vertebrates constituting the class (biology), class Aves (), characterised by feathers, toothless beaked jaws, the Oviparity, laying of Eggshell, hard-shelled eggs, a high Metabolism, metabolic rate, a fou ...

and

mammals A mammal () is a vertebrate animal of the class Mammalia (). Mammals are characterised by the presence of milk-producing mammary glands for feeding their young, a broad neocortex region of the brain, fur or hair, and three middle e ...

, including

humans Humans (''Homo sapiens'') or modern humans are the most common and widespread species of primate, and the last surviving species of the genus ''Homo''. They are Hominidae, great apes characterized by their Prehistory of nakedness and clothing ...

. The young remain in the

yolk sac The yolk sac is a membranous wikt:sac, sac attached to an embryo, formed by cells of the hypoblast layer of the bilaminar embryonic disc. This is alternatively called the umbilical vesicle by the Terminologia Embryologica (TE), though ''yolk sac' ...

for another week, then they feed on insect

larvae A larva (; : larvae ) is a distinct juvenile form many animals undergo before metamorphosis into their next life stage. Animals with indirect developmental biology, development such as insects, some arachnids, amphibians, or cnidarians typical ...

and small

crustaceans Crustaceans (from Latin meaning: "those with shells" or "crusted ones") are invertebrate animals that constitute one group of Arthropod, arthropods that are traditionally a part of the subphylum Crustacea (), a large, diverse group of mainly aquat ...

. Young gar typically lead solitary lives and sexual maturity is achieved around three years of age when the gar reaches about in length.

Diet and habits

Shortnose gar are efficient, fierce, ambush predators. They feed mainly on fish, but they are very opportunistic and also eat

crayfish Crayfish are freshwater crustaceans belonging to the infraorder Astacidea, which also contains lobsters. Taxonomically, they are members of the superfamilies Astacoidea and Parastacoidea. They breathe through feather-like gills. Some spe ...

insects Insects (from Latin ') are hexapod invertebrates of the class Insecta. They are the largest group within the arthropod phylum. Insects have a chitinous exoskeleton, a three-part body (head, thorax and abdomen), three pairs of jointed ...

, and other

invertebrates Invertebrates are animals that neither develop nor retain a vertebral column (commonly known as a ''spine'' or ''backbone''), which evolved from the notochord. It is a paraphyletic grouping including all animals excluding the chordate subphylum ...

. During seasonal flooding, Shortnose gar have been observed exploiting newly accessible floodplains to reach terrestrial prey, such as insects and amphibians, thereby broadening their dietary opportunities. Despite feeding mainly on whatever fish are available, Shortnose gar eat more invertebrates than any other gar and have even been found to exhibit territorial defense behaviors around favorable pools while foraging on high numbers of

periodical cicada The term periodical cicada is commonly used to refer to any of the seven species of the genus ''Magicicada'' of eastern North America, the 13- and 17-year cicadas. They are called periodical because nearly all individuals in a local population a ...

s.
American Midland Naturalist Journal: Shortnose Gar - Territorial Defense of Profitable Pool Positions.Potter, George E. (1923) "Food of the Short-Nosed Gar-Pike (Lepidosteus platystomus) in Lake Okoboji, Iowa," Proceedings of the Iowa Academy of Science, 30(1), 167-170. Available at: https://scholarworks.uni.edu/pias/vol30/iss1/36

Distribution

Shortnose gar today are only located in North America. Located mainly in the central United States, they occupy much of the

Mississippi Mississippi ( ) is a U.S. state, state in the Southeastern United States, Southeastern and Deep South regions of the United States. It borders Tennessee to the north, Alabama to the east, the Gulf of Mexico to the south, Louisiana to the s ...

and

Missouri River The Missouri River is a river in the Central United States, Central and Mountain states, Mountain West regions of the United States. The nation's longest, it rises in the eastern Centennial Mountains of the Bitterroot Range of the Rocky Moun ...

basins ranging from

Montana Montana ( ) is a landlocked U.S. state, state in the Mountain states, Mountain West subregion of the Western United States. It is bordered by Idaho to the west, North Dakota to the east, South Dakota to the southeast, Wyoming to the south, an ...

(in the west) to the

Ohio River The Ohio River () is a river in the United States. It is located at the boundary of the Midwestern and Southern United States, flowing in a southwesterly direction from Pittsburgh, Pennsylvania, to its river mouth, mouth on the Mississippi Riv ...

(in the east) in the north and the

from

Louisiana Louisiana ( ; ; ) is a state in the Deep South and South Central regions of the United States. It borders Texas to the west, Arkansas to the north, and Mississippi to the east. Of the 50 U.S. states, it ranks 31st in area and 25 ...

and

Alabama Alabama ( ) is a U.S. state, state in the Southeastern United States, Southeastern and Deep South, Deep Southern regions of the United States. It borders Tennessee to the north, Georgia (U.S. state), Georgia to the east, Florida and the Gu ...

to parts of

Texas Texas ( , ; or ) is the most populous U.S. state, state in the South Central United States, South Central region of the United States. It borders Louisiana to the east, Arkansas to the northeast, Oklahoma to the north, New Mexico to the we ...

in the south.

Importance to humans

Shortnose gar help maintain ecosystem equilibrium by feeding on minnows that are destructive to game fish and other fish populations. They are popular aquarium fish, and are frequently found in public aquariums across the country.

Conservation status

With very few natural predators able to cope with a gar's thick ganoid scale armor, shortnose gar are generally plentiful. One exception is in

, where they are considered a fish of special concern due to restricted distribution and limited population sizes. In Ohio, they are an endangered species because of limited range (primarily the Ohio River and lower Scioto and Great Miami Rivers).

Etymology of name

In Greek, ''Lepisosteus'' translates to "bony scale", and ''platostomus'' translates to "broad mouth".

References

* {{DEFAULTSORT:Shortnose Gar Lepisosteidae Freshwater fish of the United States Fish described in 1820 Taxa named by Constantine Samuel Rafinesque