Highfin Lyretail Swordtail

Highfin Lyretail Swordtail (Xiphophorus hellerii) combines three features: the standard swordtail lower caudal extension, a dramatically elevated high dorsal fin in males, and the lyretail caudal fin mutation with extended upper and lower rays. A triple-fin development fish of considerable visual drama. The lyretail mutation extends the caudal fin rays into flowing filaments, adding further drama to an already spectacular fish. Gentle flow and clean water are important to maintain fin integrity. The Swordtail is one of the most iconic livebearers in the freshwater hobby — the dramatically elongated lower caudal fin ray of males creates an unmistakable silhouette that has made this fish a staple of the hobby for over a century.

Feeding & Care Tip: Sera Vipan Tropical Flakes and Hikari Mini Algae Wafers make excellent daily staples. Supplement 2–3× per week with Hikari Frozen or Freeze-Dried Baby Brine Shrimp, Hikari Frozen or Freeze-Dried Brine Shrimp, Hikari Frozen Daphnia, or Hikari Vibra Bites. For fry, Sera Micron Fry Food is an ideal first food. Feed small amounts 2–3 times daily.

Native to rivers and streams of Mexico and Central America — from Veracruz in eastern Mexico south through Guatemala. Inhabits clear, cool to warm streams with moderate current and abundant vegetation. Swordtails are among the most adaptable livebearers and tolerate a wide range of water conditions. The sword — the elongated lower caudal fin ray — is found only in males and develops gradually as males mature. Females are deeper-bodied and lack the sword.

Keep with two or more females per male — male swordtails pursue females persistently and individual females without companions to share attention will be stressed. Swordtails can be aggressive toward each other: males fight with rival males, and keeping multiple males requires adequate space. Compatible with most peaceful community fish. An interesting biological note: female swordtails occasionally undergo sex reversal, developing swords and male characteristics — this is normal and harmless.

Swordtails are prolific livebearers — females produce 20–100 fry every 4–6 weeks. Dense planting provides essential cover for fry. Sera Micron Fry Food is an excellent first food for newborn swordtails.

Care & Ideal Parameters