Some fish are salt tolerant and live in salt water (the sea) e.g. Tuna, Angelfish, lion fish, Ocean Trout, etc.
Some fish are adapted to live in fresh water e.g. Brook Trout, Brown Trout, Rainbow Trout, Talapia, Catfish, Guppies, Mollies etc.
Some fish can live in both sea water and fresh water e.g Salmon, eels etc.
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The difference is.. well... if you think about it like putting Freshwater Fish into saltwater, it is going to have a reaction and die to the water because of the salt, whereas with the saltwater fish in the fresh water, it will still die because it is not in ts natural habitat.
Freshwater fish live in freshwater and Saltwater Fish live in saltwater. Freshwater fish are a little dull in colored compared to saltwater fish.
Live in salt and freshwater
A professor at a university is observing the mating behavior of freshwater fish. A college student is curious about the growth of desert plants in the presence of excess amounts of water.
Silver Dollars and Plecos are the two major fish i can think of but most aquarium fish are omnivores. I think but im not to sure but loaches like the dojo loach,clown loach, and coolie loach are also herbivores.
Organisms live within an ecosystem, ie. Fish in a fish tank Birds in a hedgerow
Is a yellow perch a 2nd level consumer