Oceans have approximately two tidal shifts per day, meaning that there are two low tides and two high tides per day--more specifically, every 24 hours and 50 minutes. At any given time of day, the tide is either slowly moving in or moving out. One indirect but very powerful affect tides have on humans is in the behavior of sea life. Many different kinds of sea life, especially those that live on or near the shore, depend on the changing tide for survival. Many fish or other sea creatures that humans harvest for food move according to the movements of the tide, so fishermen pay especially close attention to high and low tides for indications of when they should go out and when they should cast nets. Even fish that do not act based on tidal movements are still part of the food chain that is supported by the constant tidal cycles.
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Fishing
Oceans have approximately two tidal shifts per day, meaning that there are two low tides and two high tides per day--more specifically, every 24 hours and 50 minutes. At any given time of day, the tide is either slowly moving in or moving out. One indirect but very powerful affect tides have on humans is in the behavior of sea life. Many different kinds of sea life, especially those that live on or near the shore, depend on the changing tide for survival. Many fish or other sea creatures that humans harvest for food move according to the movements of the tide, so fishermen pay especially close attention to high and low tides for indications of when they should go out and when they should cast nets. Even fish that do not act based on tidal movements are still part of the food chain that is supported by the constant tidal cycles.