FOR AGES 3 YEARS TO 18 YEARS
At Kidadl we pride ourselves on offering families original ideas to make the most of time spent together at home or out and about, wherever you are in the world. We strive to recommend the very best things that are suggested by our community and are things we would do ourselves - our aim is to be the trusted friend to parents.
We try our very best, but cannot guarantee perfection. We will always aim to give you accurate information at the date of publication - however, information does change, so it’s important you do your own research, double-check and make the decision that is right for your family.
Kidadl provides inspiration to entertain and educate your children. We recognise that not all activities and ideas are appropriate and suitable for all children and families or in all circumstances. Our recommended activities are based on age but these are a guide. We recommend that these ideas are used as inspiration, that ideas are undertaken with appropriate adult supervision, and that each adult uses their own discretion and knowledge of their children to consider the safety and suitability.
Kidadl cannot accept liability for the execution of these ideas, and parental supervision is advised at all times, as safety is paramount. Anyone using the information provided by Kidadl does so at their own risk and we can not accept liability if things go wrong.
A candiru is a type of parasitic catfish that preys on other fish, animals, and humans. They are freshwater fish and are prevalent in the Amazonian basin. Generally, the candiru fish has a translucent and cloudy color. After feeding, they may acquire a greyish or brownish hue. Its gills are covered with spikes which it uses to latch on to its prey. They are found in the gills of larger fish. In some cases, they have been known to latch on to animals and humans.
The hematophagous candiru can travel all the way up the urinary tract of an animal and reach the urethra. However, to date, there has been only one confirmed case of a candiru attaching itself to a human. The largest candiru fish ever recorded to date was 16 in (40 cm) long! In many ways, the candiru bears a close resemblance to an eel, though it is smaller. So, for more interesting facts about candiru fish, read on.
To know more about similar animals, check out the electric eel and the cobia.
The candiru is a type of parasitic catfish.
The candiru fish belongs to the class of ray-finned fishes or Actinopterygii.
The candiru fish has had little contact with humans. As such, there is no documentation of their exact numbers. It is known that there are over 136 species presently.
The candiru (Vandellia cirrhosa) is found in murky and shallow waters of North and South America.
The preferred habitat of the candiru catfish is the Amazon river basin and the Ornico river basin. As they do not possess appendages, they cannot jump out of the water or swim against a strong current. Thus, they prefer to remain in shallow and slow-moving, acidic water. They burrow within the sandy bottom when not feeding or performing other activities.
The candiru fish live solitary lives, latching onto the body of their agent when needed.
Not enough study has been done to gauge the life span of a candiru. There has been only one instance of them being born in captivity. However, their life span was not observed in this case.
Among candiru vandellia, the male corners the female by swimming around her repeatedly. When the fishes come in lateral contact, the egg and sperm are released. Their gestation period is not known. The female lays a batch of eggs that may contain anywhere from up to 15 eggs. The breeding activity takes place over three days. Their breeding season is believed to be around December and the females lay eggs multiple times during each breeding season. The adult candiru fish do not take any care of their offspring or remain around to hatch them.
The IUCN classifies the Trichomycterus papilliferus as being Endangered. Whereas the Cambeva stawiarski is classified as an animal of Least Concern. The species, Trichomycterus papilliferus, is included in the list of endangered animals under the Conservation of Endangered Species of aquatic and semi-aquatic Fauna in the Baixo Iguaçu Basin.
*This image is that of an eel that looks similar to a Candiru.
The candiru has a small head and a translucent body. After feeding, it acquires a blackish or brownish color and its belly appears distended. Due to its small size and cloudy body, it is difficult to spot in the murky waters. The parasitic catfish has a head covered with barrels. Its gill covers have spines pointing backward.
Being a parasite, it is of little surprise that the candiru scores very low on the cuteness scale. They are slimy, long, and have spiky heads. They also have very large eyes when compared to their small size. After feeding, their belly becomes disproportionately extended like a mosquito's.
The candiru (Vandellia cirrhosa) has huge eyes as compared to its body. Hence, it is believed that they rely on visual cues. Generally, they can sense nitrogen-rich water, which is water expelled by the gills of larger fish. However, they may often confuse this with ammonia (in sweat and urine) which has a nitrogen component. Similar to amphibians, the candiru has a lateral line system that helps it to sense movements in the water.
The average size of the candiru (Vandellia cirrhosa) is only 2-7 inches. This means they are approximately the same size as salamanders or a Marmoset monkey.
The candiru is an extremely agile and fast swimming fish. However, there are no proper measurements of their exact speed.
The weight of an individual candiru fish is not known as these animals have not been studied in captivity.
The candiru fish is known as the cañero or candirus. There is no specific name for the male and female of the species.
Candirus hatch from eggs. There is no specific name for their offspring.
Generally, candirus drink fish and animal blood. However, some candiru species are pretty harmless. They burrow at the bottom of muddy rivers and feed on insect larvae and protozoa.
The feeding habits of candiru make them dangerous. Once inside a gill, they bite off the gill filament and enjoy the blood flow. The spikes on their gills can cause inflammation within the urinary tract and lead to a hemorrhage in animals and humans. Candiru attacks may result in death if such hemorrhages are left untreated.
Absolutely not! As a parasite, the Vandellia cirrhosa attacks animals, including humans, if given the chance. Moreover, they are not sentient enough to be a good companion. They can also swim and turn fast, making them very difficult to catch.
The backward spines on a candiru fish actually prevent it from being extracted or being pushed backward in a tunnel.
A general blood-feeding session may last from half a minute to over two minutes. In the case of fish, the candirus leave the fish once done and go back to their muddy burrow.
The candiru fish wait for larger fish to open their gills. They then bite off the gill filament and latch on to the operculum with their spines. Their prey includes various species of catfish as well. Generally, people swimming in the Amazon River wear tight clothing to avoid any contact with them.
It was earlier believed that the candiru is attracted to urine and sweat (ammonia compounds). But this theory was proven wrong in 2001 when experiments on the feeding behavior of the candiru fish actually were conducted. It showed that they gave no reaction to chemicals added to their water tank. Rather, they were attracted to nitrogen-rich water. The water flow created by urine might also have confused them into thinking it was a fish's gill.
Here at Kidadl, we have carefully created lots of interesting family-friendly animal facts for everyone to discover! Learn more about some other fish including the moray eel and the fluke fish.
You can even occupy yourself at home by drawing one of our candiru coloring pages.
Read The Disclaimer
At Kidadl we pride ourselves on offering families original ideas to make the most of time spent together at home or out and about, wherever you are in the world. We strive to recommend the very best things that are suggested by our community and are things we would do ourselves - our aim is to be the trusted friend to parents.
We try our very best, but cannot guarantee perfection. We will always aim to give you accurate information at the date of publication - however, information does change, so it’s important you do your own research, double-check and make the decision that is right for your family.
Kidadl provides inspiration to entertain and educate your children. We recognise that not all activities and ideas are appropriate and suitable for all children and families or in all circumstances. Our recommended activities are based on age but these are a guide. We recommend that these ideas are used as inspiration, that ideas are undertaken with appropriate adult supervision, and that each adult uses their own discretion and knowledge of their children to consider the safety and suitability.
Kidadl cannot accept liability for the execution of these ideas, and parental supervision is advised at all times, as safety is paramount. Anyone using the information provided by Kidadl does so at their own risk and we can not accept liability if things go wrong.
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