they dont
To feed themselves
Bass feed on insectlarvae ,crustaceans, and fish smaller than themselves.
newts , fish, and sometimes toads themselves
The fish and their pray would have nothing to feed on and die themselves.
Penguins are wild animals, but they can care for themselves they have a natural instinct that they know when and how to hunt for food as in Fish and Krill
Lampreys attach themselves to fish and feed off the blood of fish. The Lamprey has an indirect lifestyle lasting between five and nine years.
Dolphins are aquatic mammals. They give live birth and suckle their young from their mother's milk. They can not feed themselves until the young dolphin has been weaned off milk and is able to eat fish.
The biological vector of lampreys is fish. Lampreys typically attach themselves to the bodies of fish using their sucker-like mouthparts, and feed on the blood and bodily fluids of the host fish.
Clown fish feed like most regular feed, by mouth.
Simply by comsuming other substances such as fish, grass, meat, eggs, and so on.
Give a man a fish and you feed him for a day. Teach a man to fish and you feed him for a lifetime. -Chinese Proverb
You just feed it DONE!