My fragile duck is always glad that members of the subfamily Serrasalminae (Characidae, order Characiformes) are not found in this region. Well, at least the carnivorous members, for large Colossoma 3 ft long have been sighted in Singapore's reservoirs, presumably thriving on the fallen fruit of the overhanging forest just as they would have done in their native Amazon and Orinoco river basins. Closely related to the Serrasalminids (which means saw-toothed salmon, indicating that the original describer was clearly unfamiliar with salmon) are the popular aquarium fishes known as tetras (Characidae), freshwater hatchetfish (Gasteropelecidae) and pencilfish (Lebiasinidae). Though rarely reaching more than a couple of inches in length, the smaller characins share their cousins' toothy jaws and meat-loving habits. Scale up a neon tetra from an inch to about half-a-foot and I wager you'll end up with a creature that will chew off the nuchal humps of hybrid monster cichlids and your fingers to boot.
Despite their legendary ferocity, piranhas (genera Pygocentrus, Serrasalmus, Pristobrycon, Pygopristis and Catoprion – the last being a monotypic genus with a silverdollar-like creature that eats the scales of other fish) have a reputation that probably precedes reality. A 1980s B-movie (directed by non other than James "Titanic" Cameron) depicted bioengineered piranhas that are able to fly around like foot-long avian gremlins and have an unhealthy appetite for women in bikinis. The only thing worse than this ichthyological atrocity is an upcoming remake where an aquatic tremor unleashes a school of prehistoric piranhas in an Arizona lake.
However, authenticated cases of fatalities directly caused by piranha attacks are as rare as the mokele mbembe, and it is thought that incidents of supposed human consumption stem from fish helping themselves to an already drowned or otherwise dispatched individual. Non fatal attacks that merely involved getting pieces of your lower limbs bitten off are believed to be the result of stupid naked apes blundering into the breeding territories of spawning pairs. Turning the table, the natives of piranha-infested regions are known to have a taste for the meaty fish and are said to have relatively little fear of the schooling biters compared to the real risk of encountering the business end of a freshwater stingray.
That said, it's still probably a good idea not to dangle your duck finger over murky South American rivers or dip your arm into an aquarium housing a specimen or more. And even if the piranhas are sated, exposed ducks stand a chance of an intimate session with a little fish that will wriggle into your member and give you a bloody blowjob from the inside out.
Perhaps the most result of piranha-human relations is by Jan H. Mol of the University of Suriname who investigated attacks on humans by Serralsalmus rhombeus in the tiny South American banana republic. Writing in Studies on Neotropical Fauna and Environment, December 2006; 41 (3): 189-195, Mol reminds us that piranhas are rightly more dangerous out of water, with most bites taking place when netted fish are flapping and gnashing their teeth at random on boats.
Mol examined three sites where piranha attacks had been documented: two isolated Amerindian villages and a recreational park by the Suriname River. He obtained demographic data from municipal records; scoured historical records of attacks since 1923; interviewed victims and eyewitnesses; analysed and fished the waters at the attack locales.
In both Amerindian villages, piranha attacks were found to be correlated with periods of high human population growth. At one village, Donderkamp, all attacks took place in a 50x20 m area near a river landing stage, with no known attacks of bathers up- or downstream of the landing stage. The species implicated was confirmed by the recovery of part of a human toe from the stomach of a 25 cm S. rhombeus 3 hours after an attack at the same fishing location. One victim was singled out as a visitor from the capital, Paramaribo, who ignored a prominent "warning-piranhas" sign and was bitten in his big toe the moment he entered the water. The bulk of attacks took place in the low-water (dry) season.
At the recreational park, the attacks also began only in the dry season, 6 months after the park opened. Mol reports that guests were spilling food in the river, attracting small characins, including piranhas, which then started to take chunks of out bathers. Juvenile piranhas caused superficial wounds, but full-grown fish produced more impressive scars ("muscle tissue removed to the bone," remarks Mol coolly) that would last a lifetime and offer endless fodder for outrageous grandfatherly tales.
The seasonal nature of piranha attacks at all three sites was perceptible. Mol suggests that low-water conditions where large numbers of fish are concentrated in increasingly smaller pools represent a particular risk. The mere presence of S. rhombeus is insufficient to denote the possibility of attacks; Mol notes that bathers in neighbouring French Guiana have never encountered attacks even in places where the species is common. For his part, he claims to have suffered no woe from piranhas "in 15 years of field work... often wading for hours through piranha-infested' streams and catching piranhas with hook and line while bathing in the river."
This observation is shared by natives in the know. Amerindians in Guyana would, Mol recounts, use old sacking to protect their legs when entering dry-season pools. Menstruating women would also be barred from bathing in the river.
Elsewhere, piranha attacks have been linked to human disturbance of brooding parents, but the Suriname attacks took place after the breeding season and Mol suggests that high post-spawning populations of young and hungry fish, coupled with the corresponding surge in human activity such as bathing and gutting of fish by the river (piranhas are attracted to splashing and the sound of objects falling into the water), created conditions highly amenable to the maceration of manmeat by Serralsalmid mandibles. One also detects a veritable sigh of academic weariness in Mol's concluding declaration that questions the wisdom of setting up recreational parks with bathing zones right along rivers full of potentially hazardous fishes. But who knows? It might just be somebody's idea of an extreme sport or a great set for a reality show spin-off to be called "Fish Factor"....
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