The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries.
From Kieryn Phipps:
If you want the most realistic experience of swimming in the ocean with exotic fish, this is the app for you. Fish Swarm incorporates advanced artificial intelligence to create detailed, lifelike fish that swarm like real ocean fish, so you feel like youre really there. The intuitive controls allow you to glide effortlessly, turn smoothly, and choose the pace that suits you. And when youre done exploring, get ready to play! Can you beat the reef shark to the finish line? Collect all the seashells in under two minutes? After youve completed all levels, mysterious clues and hidden objects lead to the ultimate experience -- a close encounter with a Great White Shark! Realistic -- fish swarm like real ocean shoals Explore Mode -- Relax and enjoy! Glide effortlessly through the water, watch the fish as they swarm, follow them into the depths of the ocean . . . Fish Mode -- Take on the fishs perspective! Select a species of fish to control as you explore the underwater valleys and hills . . . Challenge Mode -- Ready to play? Four progressive levels test your perseverance and skill. Start as a herring and, with each successive win, earn the chance to become a bigger and better fish. Or play against yourself and see if you can beat your best time! Mystery Puzzle -- Figure it out! Each completed game level reveals a hidden object that helps you unlock the king of the ocean . . . can you decipher the clues?