Not necessarily. Some fish like salmon and fresh water eel are anadromous or catadromous, meaning they live in the ocean and breed in fresh water systems or live in fresh water and breed in the ocean, respectively. All fish breed sexually and most reproduction is through external fertilization. This means the egg and sperm meet outside the body. The only difference in common mating behaviors for salt water and fresh water fish is that sometimes we see more elaborate mating rituals in salt water species, particularly in tropical fish.
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