1, Right: Young Swordtails greedily eating small white worm.

2, The BY-F swordtail fish are susceptible to develop cataract.

3, The sleek swordtail is an agile swimmer and needs plenty of room.

4, Walling and his colleagues investigated green swordtail fish, a Central American species popular in the tropical aquarium market.

5, It's the look of love—when female green swordtail fish see attractive adult males, they mature faster sexually, researchers now find.

6, The cataract can cause other eye complications in BY-F swordtail fish.

7, Objective To explore the cataract development and its influence on the living status of BY-F swordtail fish.