Cynodonichthys pacificus
Cynodonichthys pacificus is a small tropical killifish reaching about 7.5 cm. It inhabits shallow freshwater streams and ponds and is popular among hobbyists for its bright colors rather than as a sport or food fish.
Family
Rivulidae
Max Size
7.5 cm
Habitat
freshwater
Climate
tropical
Best Season
Year‑round, with peak activity during the rainy season (May‑September)
Best Time
Early morning and late evening
No distribution map available
Rio Claro
Costa RicaClear mountain stream in the Monteverde region known for abundant populations of Cynodonichthys pacificus in shallow riffles.
Best: June-September
Río San Juan
NicaraguaLarge lowland river bordering Costa Rica, featuring slow‑moving pools and dense vegetation favored by the species.
Best: May-October
Cañón del Chiriquí
PanamaSteep canyon streams in western Panama offering clear water and rocky substrates where the fish thrive.
Best: July-October
Lake Arenal
Costa RicaHigh‑altitude reservoir with numerous tributary streams that host thriving Cynodonichthys pacificus populations.
Best: May-September
Río Guayas
EcuadorLarge river system on the Pacific coast where the species is found in its tributary streams and floodplains.
Best: December-March
Pacific Coastal Streams near Santa Elena
Ecuador (Galápagos Islands)Remote coastal streams on Santa Cruz Island, a bucket‑list destination for killifish enthusiasts seeking pristine habitats.
Best: January-April
Best bait: Mosquito larvae, daphnia, or tiny pieces of worm