 However, the speed of movement of the adult fishes is such that even with an 'egg trap' in place, a small percentage of eggs will still be eaten.A large adult female in prime condition may produce as many as 300 eggs.A breeding aquarium for the lemon tetra thus requires good quality filtration and aeration, fine leaved plants, and an 'egg trap' present to prevent large-scale losses because of the aforementioned parental instincts.