This question is very broad. Unfortunately this means I will have to give a suitably broad answer in return.
There are many species of fresh water turtles, or terrapins, and they eat a wide variety of foods in their respective habitats. Some are herbivores, some omnivores and others are carnivores.
As for raising them, you'll need to do the necessary background research before you try.
Many turtles need a lot of space to live comfortably without getting sick and unfortunately some of the most easily acquired turtles in the category (red eared sliders) are not particularly beginner friendly due to huge space requirements.
Almost every turtle will need a UVA and UVB bulb to promote good health. Not providing it will be a very cruel thing on your part.
they look like original turtles with fins on the back and front.
They (as well as tortoises, their close relatives in the reptile world) have protective shells. Turtle also live in the water, sometimes even the sea.
usually salt water turtles live in the sea, so they are bigger, and usually have no claws, just flippers. it's very unlikely that you have a saltwater
About 50 ray species throughout the world regularly venture into fresh water. More than two dozen species are capable of surviving their life cycles in fresh water. At the extreme, several ray species in the Amazon River Basin have become so rigidly adapted to river life that they cannot survive salt water
Land turtles eat earthworms and insects outside! if you found a turtles outside it is not your responsibility to keep it. it could be dangerous! they do not even like people. i got one and it just wants to leave.
Snapping turtles live in fresh water
gold fish turtles, koi, and fresh water fish
River otters live in the shores of fresh water regions. River otters live on river shores. River otters hold there breath when going under water. They also use sticks and branches to build a dam in the water.
All snapping turtles are fresh water.
it is a fresh water river
Fresh water from the Rocky Mountain snow melt.
The great Mississippi river is made entirely of fresh water.
in ponds and other fresh water places Glenn
No, loggerhead turtles do not need fresh water. They have a specialized tear gland that excretes sodium and potassium. Thus, they are able to 'create' their own fresh water.
the water in the amazon river is fresh water
fresh water
The Avon River is fresh water.