Let's Go to the Sea (1) - S1.E20

Willibit discovers some fish trapped in a pond. He wants to keep it a secret so he isn't real happy when Lillibit not only finds out about it, but also tells Bakeabit the town baker about the fish. Willibit draws him a picture of one of the fish in the dirt with a pipe stick, and Bakeabit tells them that the fish are probably trapped salmon and that the two children should try to free the salmon.