There was a Fisherman whose only income was from catching and selling the fresh fishes he caught.
The more fishes he caught, the more income he would receive.
However, to catch more fishes meant he had to travel a longer distance in the sea. And travelling a longer distance also took more time for the Fisherman to return home and as a result, the fish caught lost their freshness and was unable to fetch a good price. 
The fisherman then brought freezers on his boat to store the fishes caught and preserve their freshness. Unfortunately, the frozen fish is unable to meet the requirements of his buyers and there is a difference in fresh fish and frozen ones.
Troubled, he took away the freezers and added fish tanks in his boat. As soon fishes were caught, they were released in the fish tanks and kept alive. Many fishes were unable to endure the long journey