Xiphophorus montezumae

This is the Montezuma swordtail. Most swordtails - the specimen illustrated here is a feral variety - have shorter "swords" than X. helleri. They are rarely sold commercially. Size: 5 cm.

• Synodontis nigriventris
• Hemichromis bimaculatus
• Betta splendens
• Protomelas similis
• Tanichthys albonubes