Evidence of the moon's influence on the waters of Earth can be seen through tidal action. The highlighted days on the Moon Phase Fishing Calendars show when fish will tend to feed more aggressively.

When using the moon phase calendars to plan your fishing trip make sure you also consider the habits of the species you are targeting. For example, tuna and trout both feed at night when there is ample moonlight. Tidal action tends to be stronger when the moon is full which can provide optimum conditions for striped bass and sturgeon. Because of higher tides anadromous fish often come into river systems in greater numbers on the full moon.