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<h1>Keywords of this article: flying knife fish, ornamental fish, interesting ornamental fish</h1>
This article is reproduced from: ifish aquarium ornamental fish
This article is written by Mike Tuccinardi
Translation & Proofreader: Fishing in Muddy Waters
▲ Admittedly, this kind of gymnorhamphichthys rondoni, known abroad as the thermometer knife (Thermometer Knifefish), looks really strange. Although they are found throughout the Amazon basin, they are uncommon in aquarium markets. Like all knifefish, they can produce weak currents
I have always been a big fan of the rare fish in the aquarium world, such as those fish that are hidden, transparent and colorless, and strange-looking, and can be said to be the most perfect object. It would be better if they were somewhat challenging in breeding and would be in hiding most of the time.
Most South American knifefish, especially lesser-known species, are best suited for this description, so this type of fish is particularly popular with me.
Undoubtedly, one of the strange fish is the Gymnorhamphichthys rondoni (gymnorhamphichthys rondoni) found throughout the Amazon Basin (although its distribution range is still somewhat unknown), which is mostly transparent and extremely mysterious. This slender saury is actually a highly adapted substrate dweller that spends most of its time digging on the fine sand of its native habitat. Like all knifefish, the spiky-billed striated knife is considered a weakly electric fish that uses special organs to generate weak currents. This current is mainly used to communicate with other knifefish and to perceive their surroundings. Some foreigners will call them Mousetail (mouse tail) or Elephantnose Knifefish (elephant trunk throwing knife).
▲ Like most knifefish, the spiky-billed knife can easily swim forward and backward, and often swims in a vertical (up or down) direction.
▲ The slender snout allows the knifefish to stir the debris on the fine sand for food
▲ When they are not completely buried in the bottom sand, these fish can often be seen digging sand to find the posture of insect larvae and crustaceans, which are the main food source of the flying knife in the wild.
Common name interpretation
The translucent body of the fish presents most of the internal structure - bones, stomach, nerves, etc., which is the common name for them called "thermometer flying knives" by foreigners (because of their parallel ribs and red nerve bundles, like the mercury and temperature display scales in the thermometer). Some older individuals may have this distinctive pattern less pronounced, but because of their protruding snout and small enough to be almost invisible to the eye, they are undoubtedly a quirky fish.
▲ The author recently purchased several sharp-nosed and striped flying knives to place in the quarantine tank. Its extremely slender body allows it to travel through the bottom sand
They appear mysterious in aquariums and are used to spending a lot of time burying all or part of their bodies in the sand. As the light dims, they emerge from hiding places and search the entire aquarium, using their snout to dig the bottom sand in search of food. In the wild, food usually includes worms and insect larvae, but they are also receptive to frozen bloodworms and silk worms (make sure to feed after turning off the lights, otherwise their tank companions will easily snatch the food away).
▲ Like many knifefish, the sharp-billed knife has very small eyes and relatively poor vision
These fish use sensory holes above the nose and mouth and their unique electrically sensing receivers to locate food, which allows them to sense weak current signals generated by other animals
In the aquarium trade market, sharp-billed striated knives are usually exported from Iquitos in eastern Brazil or Peru. I have met them in the clear waters of the lower rio Tapajos near the town of Santarém; it is entirely possible, since they have the nature of submerging sand, so they should be more common than expected. I further predict that this Gymnorhamphichthys fish should be subject to some more rigorous scientific scrutiny in the near future, which may prove that what we call the pointed-beaked flying knife actually contains several closely related composite species, so I suggest that the individualS I photographed from Iquitos, Peru, preferably temporarily called Gymnorhamphichthys cf. rondoni (similar species of pointed-nosed striped flying knife).
▲ Although the habit is hidden, the pointed mouth with striped flying knife is a charming, highly specialized aquarium creature that can grow up to 15 centimeters
For those interested in this species that need more breeding skills but are fascinating, as well as other sandthrophilic fish species (in scientific terms psammophilic) found near the Taparos River in the central Amazon, the following article is worth reading:
Zuanon, J., Bockmann, F. A., & Sazima, I. (2006). A remarkable sand-dwelling fish assemblage from central Amazonia, with comments on the evolution of psammophily in South American freshwater fishes. Neotropical Ichthyology, 4(1), 107-118.
Source: http://www.reef2rainforest.com
Text/Image: Mike Tuccinardi
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