Grandma Grouper's Kelp Seeds Are Missing! Without Grandma Grouper's Kelp Seeds, all the fish will go hungry. Luckily, Freddi Fish and her finny friend Luther are on the case! But the ocean's a big place and there's a lot of ground to cover - caves, canyons, reefs and more. Children will dive right into this fascinating adventure and all the colorful characters that go with it. It's an underwater world of discovery, laughter and learning, all in one.