Chicken eggs that are for sale are unfertilized. Meaning there is no life in the egg. In order for a fish to lay eggs the eggs must be fertilized meaning there is animals life inside. The only common fish eggs i can think of are sturgeon, and i can tell you that the process in which they get those eggs is truly awful. They take these fish out of the water which can easily be 10+ feet in length, then they hang them up and cut through their stomachs to extract the eggs and toss the fish back in the water to slowly die.