Turquoise Killifish Identification Guide
Recognize the turquoise killifish by a male's brilliant turquoise-blue body with red-orange netting and its very short lifespan.
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Key identification features
- Small, stocky body, typically under 2 inches
- Males show a brilliant turquoise-blue body overlaid with a red-orange net-like (reticulated) pattern
- Red-edged dorsal, anal, and caudal fins in males
- Females are plain gray-olive with short, rounded fins and no bright pattern
- Short, rounded fin shapes overall, without long extensions
- Extremely short lifespan as an annual species, typically only a few months
Common look-alikes
- Rainbow killifish (Nothobranchius rachovii): shows more red-orange overall with blue mainly confined to fin edges, rather than the turquoise killifish's solid turquoise body wash
- Other Nothobranchius species: overlap closely in pattern and are usually best separated by exact banding details and known collection locality
- Gardner's killifish: lacks the fine reticulated netting pattern and is not an annual species
Where you'll see one
The turquoise killifish is native to Mozambique and Zimbabwe, where it inhabits temporary, rain-fed pools that dry out seasonally. Its eggs survive buried in the mud through the dry period, hatching quickly once the pools refill, giving the species its famously fast life cycle.
Frequently asked questions
How do I distinguish a male turquoise killifish from a similar rainbow killifish?
The turquoise killifish shows a solid turquoise-blue body wash with red netting, while the rainbow killifish has more red-orange overall with blue mostly limited to the fin edges.
What life-history clue helps confirm an annual killifish like the turquoise killifish?
An extremely short lifespan tied to seasonal pools that dry up, with eggs surviving in mud until the pool refills, is characteristic of annual species like the turquoise killifish.