The popularity of the Koi fish tattoo goes back to an old Chinese and Japanese myth about a huge school of a thousand Koi fish swimming upstream in China's Yellow River. When the little guys reached a huge waterfall, most of the fish turned back. A few of the Koi stuck it out, however, and after 100 years, one of them finally succeeded in leaping to the top of the falls. It impressed the gods so much they turned him into a dragon. The Koi therefore symbolizes strength, bravery, and perseverance.
Deciding to get a tattoo is a big deal, regardless of whether it's your first time under the needle or not. But for a tattoo virgin, the stakes are arguably even higher when it comes to picking a design and spot that won't be hated later. Classic wrist tattoo ideas are always a great place to start for inspiration, IMO, although what you choose to ink is entirely your decision.