Grumble Fish are a species of fish; however they are differed from the other species of fish, as their bodies can take immense pressure, allowing them to swim to the very depths of the ocean. They are a general annoyance to Aqua Grabber divers, as another trait of Grumble Fish is that they are blind and utilize their other senses to detect their surroundings. Usually, they can "see" objects or people just by using their other senses but it does seem to get off-key a bit - particularly with the Aqua Grabbers as Grumble Fish tend to accidently bump into them. Swarms of Grumble Fish are especially bad for Aqua Grabbers.