http://en.wikipedia.org/wiki/Lotic_system_ecology
Lotic systems typically connect to each other, forming a path to the ocean (spring → stream → river → ocean), and many fishes have life cycles that require stages in both fresh and salt water.
Salmon, for example, are anadromous species that are born and develop in freshwater and then move to the ocean as adults.
Eels are catadromous, and are born and develop in the ocean and then move into freshwater as adults.
Lotic systems typically connect to each other, forming a path to the ocean (spring → stream → river → ocean), and many fishes have life cycles that require stages in both fresh and salt water.
Salmon, for example, are anadromous species that are born and develop in freshwater and then move to the ocean as adults.
Eels are catadromous, and are born and develop in the ocean and then move into freshwater as adults.
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