until descending with the setting sun.

Twilight diel vertical migration

Twilight diel vertical migration involves two separate migrations in a single 24-hour period, with the first ascent at dusk followed by a descent at midnight, often known as the "midnight sink". The second ascent to the surface and descent to the depths occurs at sunrise.

Seasonal

Organisms are found at different depths depending on what season it is. Seasonal changes to the environment may influence changes to migration patterns. Normal

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