class of fishes
For ships with the list Archerfish, Archer-Fish, see USS Archerfish
The archerfish ( spinner fish or archer fish ) form a monotypic syndicate, Toxotidae, of pisces known for their habit of preying on land-based insects and other little animals by shooting them down with water droplets from their speciate mouths. The family is small, consisting of ten species in a single genus Toxotes. Most species live in fresh body of water rivers, streams and pools, but two or three are euryhaline, inhabiting both fresh and brackish water habitats such as estuaries and mangroves. [ 1 ] [ 2 ] They can be found from India, Bangladesh and Sri Lanka, through Southeast Asia, to Northern Australia and Melanesia. [ 3 ]

archerfish or spinnerfish bodies are thick and laterally compressed, with the abaxial five, and the profile a straight line from abaxial fin to mouth. The mouth is protractile, and the lower jaw juts out. Sizes are reasonably belittled, typically astir to about 12–18 curium ( 5–7 in ), but T. chatareus can reach 40 curium ( 16 in ). [ 3 ] [ 4 ] Archerfish are democratic for aquarium, [ 5 ] but unmanageable to feed since they prefer exist raven .

capture of prey [edit ]

example of an archerfish shooting water at a microbe on a hang arm Video of an archerfish shoot at raven archerfish are unusually accurate in their shoot ; an adult fish about always hits the aim on the first gear film. Although it is presumed that all archerfish species do this, it has lone been confirmed from T. blythii, T. chatareus and T. jaculatrix. [ 1 ] They can bring down insects and other prey [ 6 ] up to 3 molarity ( 10 foot ) above the water ‘s surface. [ 7 ] This is partially due to their thoroughly eyesight, but besides to their ability to compensate for the deflection of sparkle as it passes through the air-water interface when aiming at their prey. [ 8 ] They typically spit at prey at a mean fish of about 74° from the horizontal but can however aim accurately when spitting at angles between 45° and 110°. [ 9 ] When an archerfish selects its prey, it rotates its eye so that the image of the prey falls on a particular dowry of the eye in the adaxial temporal role periphery of the retina, [ 10 ] and its lips just break the surface, squirting a jet of water at its victim. The archerfish does this by forming a small groove in the roof of its mouth and its tongue into a minute channel. It then fires by contracting its gill covers and push water system through the distribution channel, shooting a flow that, shaped by its mouth parts, travels faster at the rear than at the front. This amphetamine differential causes the stream to become a blob directly ahead shock as the slower lead water is overtaken by the fast trailing water, and it is varied by the fish to account for differences in scope. It besides makes this one of the few animals that both make and practice tools, as they both utilise the body of water and shape it to make it more utilitarian to them. [ 11 ] [ 12 ] They are persistent and will make multiple shots if the foremost one fail. [ 13 ]

Young archerfish begin shooting when they are about 2.5 centimeter ( 1 in ) long but are inaccurate at first and must learn from feel. [ citation needed ] During this eruditeness period, they hunt in little schools. This way, the probability is enhanced that at least one jet will hit its target. [ citation needed ] A 2006 experimental study found that archerfish appear to benefit from experimental learn by watching a perform group member shoot, without having to practice :

This case of social eruditeness in a pisces is most remarkable as it could imply that observers can ‘ ‘ change their vantage point, ’ ’ mapping the sensed shoot characteristics of a distant team member into angles and aim distances that they late must use to hit. [ 8 ]

however little of their social behavior is presently known beyond that archerfish are sensitive to, and make changes to their shooting behaviour, when conspecifics are visible to them. [ 14 ] probably as a resultant role of the potential terror of kleptoparasitism that other archerfish present to a shooting fish. [ 15 ] An archerfish will frequently leap out of the water and grab an worm in its mouth if it happens to be within pass. Individuals typically prefer to remain close to the surface of the body of water. [ 11 ] New research has found that archerfish besides use jets to hunt submerged raven, such as those embedded in silt up. It is not known whether they learned forward pass or submerged shooting first, but the two techniques may have evolved in twin, as improvements in one can be adapted to the other. [ 16 ]

Species [edit ]

There are 9 valid species, 8 in the genus Toxotes : [ 1 ] [ 3 ] [ 17 ] [ 18 ]

timeline [edit ]

See besides [edit ]

References [edit ]

ใส่ความเห็น

อีเมลของคุณจะไม่แสดงให้คนอื่นเห็น