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[阅读] Piranha:走进食人鱼的诡异世界(三)

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发表于 2009-4-9 12:00 | 显示全部楼层 |阅读模式
Piranha:走进食人鱼的诡异世界(三)
走进食人鱼的诡异世界(三) 涉及:生物学
本文详细介绍了,人与食人鱼,包括食人鱼的一些用途,可否购买等等。
Locals often use piranha teeth to make tools and weapons. Piranha are also a popular food, though if an individual is caught on a hook or line it may be attacked by other piranhas.
Piranha are commonly consumed by subsistence fishermen and often sold for food in local markets. In recent decades, dried specimens have been marketed as tourist souvenirs. Piranhas occasionally bite and sometimes injure bathers and swimmers, but truly serious attacks are rare and the threat to humans has been largely exaggerated. A piranha bite is sometimes considered more an act of carelessness than that of misfortune.[clarify] But piranhas are a considerable nuisance to commercial and sport fishers because they steal bait, mutilate catch, damage nets and other gear, and may bite when handled.

Several piranha species appear in the aquarium trade. Piranhas can be bought as pets in some areas, but they are illegal in much of the United States, such as in Washington State, New York, Utah, Nevada, and all Southern states from the West Coast (California) to the East (Florida), and up the Northeastern seaboard. The most common piranha is the Pygocentrus nattereri, or the red-bellied piranha.
Piranhas can be bought fully grown or as babies, often no bigger than a thumbnail. It is important to keep Pygocentrus piranhas alone or in groups of three or more, not in pairs, since aggression among them is common and is distributed more widely when kept in larger groups, allowing the weaker fish to survive. When kept in groups, it is recommended that they be in even-numbered groups, as piranhas will gang up on an odd member.[citation needed] It is not rare to find individuals with one eye missing due to a previous attack. The preferred feeds are thawed shrimp, fillets of white fish, and disease free feeders, but any fish-based foods are adequate.

The young are to be fed very little, as overfeeding can kill them. Blood worms, or insect larvae, are a good choice of food, as they are full of protein. If underfed, piranhas are likely to become cannibalistic on others in their group. They eat more as they grow older and larger. In order to provide a balanced diet, it is usually necessary to change types of food often. Feeder goldfish are a popular choice for feeding piranhas, although they contain a vitamin B inhibitor that may stunt growth and shorten the fish's life span. It is recommended to feed them with feeder goldfish as a treat, once in a while, rather than basing their diet only on that. Piranhas prefer a darker environment with a lot of plant cover, as they become agitated when denied appropriate cover. It is not advisable to leave the light on constantly, for with too much light, they may lose the desire to eat.


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