"Fishing!" is an episode of Oobi from the second season.
Grampu takes Oobi fishing. Oobi learns a bit about patience and finally catches a fish. At first, Oobi is thrilled, but then he feels badly for the fish and persuades Grampu that they should set the fish free. Oobi and Grampu enjoy their special day together, regardless of the fact that they return home without any fish. — NickJr.com
Oobi is in the kitchen with a coloring book and a crayon. Grampu walks in and tells Oobi that they will spend the day together. He asks Oobi to guess what his plans are, giving hints about fish. Oobi guesses that they will go fishing, which Grampu confirms as he brings out a new fishing rod for Oobi. They travel to the pier, where Oobi spots a seagull and a buoy. Grampu shows Oobi his box of fishing equipment and teaches him how to cast a fishing rod.
Oobi feels a tug on his fishing line and reels it in, only to reveal an old shoe instead of a fish. Oobi and Grampu laugh about it and learn about patience as they wait for a bite. An interview segment plays as they wait. It involves Uma asking a girl and her grandmother about their favorite pastimes.
After this segment, the scene cuts back to Oobi and Grampu. They sing a short song and are interrupted when Oobi feels another tug on his fishing line. He manages to catch a fish and is ecstatic. However, Oobi feels badly for the fish and asks Grampu to set it free. When they arrive at their household without any dinner, Oobi finds an old can of tuna from the store and offers it to Grampu. He accepts and displays the old shoe from earlier on the wall, so that they can always remember their fishing trip.