While many people are familiar with the idea of dogs and cats getting chipped, the practice is also used with exotic pets like the Asian arowana fish, above, when there's concern of possible smuggling or sale of wild animals. (discovermagazine.com)
At the center of international intrigue, the shimmering arowana is a predator «the length of a samurai sword.» (discovermagazine.com)
There are even large pellets for such fish as arowanas, pacu, Oscars, shovel - nosed catfish and, of course, goldfish and koi. (petbusiness.com)