Five guppies love their life in a little girl's fish tank until some new additions shake things up.

"Mikey's heard the stories about the old, haunted aquarium. But he isn't scared, and he's ready to prove it. With his friends by his side and flashlight in hand, Mikey is ready to investigate. And all those eerie noises coming from the building are just the wind, right? Mikey and his friends are sure to find out in this early chapter book"--

Winter's surrogate mother, the very elderly dolphin Panama, has passed away, leaving Winter without the only poolmate she has ever known. However, the loss of Panama may have even greater repercussions for Winter, who, according to USDA regulations, cannot be housed alone, as dolphins' social behavior requires them to be paired with other dolphins. Time is running out to find a companion for her before the team at Clearwater loses their beloved Winter...

When a two-hundred-pound sea turtle goes missing from the Bayport Aquarium, Frank and Joe Hardy investigate, discovering a network of underground tunnels hidden beneath Bayport that is aiding a sinister smuggling ring.

"When Kate learns that her class is going on a field trip to the aquarium, she is thrilled that she'll get to see the penguin exhibit! The rockhopper penguins are her favorite. To prepare, Ms. Eberlin assigns the class a project: each student has to do a report about a different animal at the aquarium. Even though Kate gets assigned sea lions, she's still thrilled to go. Kate, Birdie, and the rest of the class excitedly prepare for their projects...

When Velma and the gang get a sneak peek of the rare Rainbow Flounder during an after-hours tour at the Coolsville Aquarium, a Fishy Phantom shows up and steals the exhibit.

When Ruka was younger, she saw a ghost in the water at the aquarium where her dad worked. Now she feels drawn toward the aquarium and the two mysterious boys she meets there, Umi and Sora, who were raised by dugongs and hear the same strange calls from the sea as she does.

While on a field trip to the aquarium, Nancy discovers that she loves all the different sea life except for jellyfish, but with the help of Ms. Glass and her friends, Nancy is able to overcome her fear of the gelatinous animals.

The story starts with a sushi restaurant that has an empty aquarium. Where did all the fish disappear to? The author take the reader to a strange imaginative world.

"Otter keeper is taking me and Teddy on a trip to visit sea friends! I am going to meet all the animals that live in the ocean. I wonder which one will be my favorite ..."--Jacket flap.