B

　　If you were looking for an animal to take the title of “most violent fish in the sea”， then the puffer fish(河豚) would have to be a strong competitor.Not only is it poisonous—though that doesn't stop people trying to eat it—and able to scare off other creatures in the sea by inflating itself to become much larger than normal, but also it chews on its own brothers and sisters when it is young.

　　Puffers attach their eggs to rocks near the bottom of the sea, often at the mouths of bays.Then the larvae(幼鱼)move to the wide part of the river once they have grown a little.Having put on more weight, they head for the sea.It's no childhood for the puffer fish, though, as Shin Oikawa and his colleagues found when they hatched puffer larvae in the lab and monitored them for two months.They found the larvae went through three step changes when they reached body weights of 0.002 grams, 0.01g and 0.1g.When a larva went through one of these changes, its behavior also changed.For instance, once a larva passed the first level it would grow its first teeth and could start attacking the larvae that had not reached that stage.Similarly, any larva that had reached the 0.01g or 0.1g levels would start attacking the larvae that hadn't.

　　The baby fish had a “relatively small mouth”， so rather than swallow their brothers and sisters whole, they would bite pieces out of them.Despite this limitation, the fish caused plenty of deaths.

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