Look: There’s a glimmer of light to the east.

Now, heres why we’re out at this hour. During the night, fish of the size we’ve been catching glide drowsily along at a rate of something less than seven inches per second. They idle all night without eating. They become famished. A few minutes before dawn-just about now-their inner alarm clock goes off, and they begin to rove. In the first ten minutes after the onset of light in the sky there is a sudden upsurge in their swimming speed; they have started at once to range for food. Twenty minutes after daybreak they put on their greatest spurt of the twenty-four hours and swim between twenty and thirty inches per second; they’re capable of much greater speeds when attacking a prey. The sun will come up over there, about where Hyannis lies beyond the horizon, in just a few minutes, at five twelve. So we should be on the alert for some fast-swimming blues at between five twenty-five and five thirty. Just about when the clock down in the cuddy strikes three bells, we should hook a fish.

Taken from-  Blues by John Hersey