Amazon Is Selling a Handheld Fish Finder for Only $83, And Buyers Say 'You Can't Beat It' originally appeared on Athlon ...

as many areas have ordained size limits for fish to be harvested. But when you're not measuring trout, this tool has no shortage of applications. Since they must fit into such a compact package ...

it benefits a fish to know what size they are before picking a fight, says Kobayashi. In other words, the fish were clever enough to employ the mirror as a decision-making tool.