Aiyo, this vertical migration is for feeding, no... the small fishes and prawns come up at night to eat plankton under darkness. But from our boat, I see it is also to escape the heat. The surface water becomes like bathwater by afternoon, so they go deeper for coolness. At dawn, they are not just going down, they are rushing away from the waking predator fish... I know because my net feels heavier with both the small ones and the chasing seer fish at first light.
#surfing#mulki
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