Captain Planet and the Planeteers (1990)

Season 6: Episode 1

Hoggish has set up a new commercial fishing business in the amazon, but when discovers that a group of local river Dolphins are literatly eating into his fishing profits, he schemes to eliminate the problem. Upon being breifed by Gaia, the Planeteers quickly race to make sure the amazon rivers are not made ""Dolphin-Safe"" simply for the sake of progress..