If one doesn't practice remembering Krishna while one is struggling for existence, then it will not be possible for one to remember Krishna at the time of death.
A devotee knows that even at his death Krishna will protect him. The real test of our devotion will be at that time.
Death is not a big thing, what is important is God's service.
The unsuspecting fish, who knew nothing but a life in the river, went about its routine like any other day, but in an instant was ripped out of its reality to meet with death.