Green Swordtail
Xiphophorus hellerii
Green swordtail is a livebearing poeciliid native to streams and rivers of Mexico and Central America, now widely introduced in warm waters worldwide. Males are famous for the elongated lower tail-fin ray (“sword”); females are larger and lack the sword.
Identification points
- Males have a long, sword-like extension from the lower edge of the tail fin.
- Body is slender and laterally compressed, usually olive-green to yellow-green with a darker lateral stripe.
- Dorsal fin is relatively tall and the mouth turns slightly upward for surface feeding.
Habitat
Warm, slow to moderate freshwater streams, ditches, canals, ponds, and vegetated river margins; often near emergent plants, submerged grass, and cover in shallow water.
Bait notes
Small live or frozen foods work best: bloodworms, daphnia, brine shrimp, mosquito larvae, and tiny insect pieces. Micro pellet fish food, crushed flakes, and small soft plastics or fly nymphs can take them where angling is permitted.
Behavior
Omnivorous surface and midwater feeder that picks insects, algae, biofilm, and tiny crustaceans. Males display and chase rivals, while females often school loosely and give live birth to fry.
Caution
Keep in mind they are an introduced aquarium species in many regions; release laws may apply. Like many small ornamental fish, they are not typically eaten, and collection may be restricted in some waters.
Fishing notes
They are rarely a targeted gamefish; where legal, use ultralight tackle, tiny hooks, and a stealthy presentation near weed edges and shallow cover. Chumming with fine crumbs or pellets can concentrate fish; gently pinch barbs to release them safely.