Max Size: 4.5cm

Blue Striped Rivulus Killifish (Rivulus Xiphidius, Laimosemion xiphidius)

The Blue Striped Rivulus is a unique-looking, small, colourful and peaceful species of Killifish. You should maintain these fish in a species-only aquarium, and the males should be given plenty of space to set up territories since they do not tolerate each other.

The Blue Striped Rivulus is best kept as either a pair or in small groups, making sure you have one male to three or four females on average. These Killifish are excellent jumpers, so a tight-fitting lid is essential.

The Blue Striped Rivulus has an elongated body with a rounded caudal fin. These fish also have a thick black-centred stripe bordered with an iridescent blue line that runs throughout the fish's entire body, starting just behind their eye and ending at the edge of the caudal fin.

The rest of the caudal fin is orangy-red. The pattern on the caudal fin is also found on the pectoral and anal fins. Females are heavily spotted with light blue and display a relatively distinct dark line that runs down the length of the body.


Blue Striped Rivulus Killifish
Quick Facts
Scientific NameRivulus Xiphidius, Laimosemion xiphidius
Year Described1979
Other NamesBlack-Tailed Rivulus
OriginsBrazil, Guyana, Suriname
Aquarium LevelMiddle - Top
DifficultyBeginner - Intermediate
Best kept asPairs
Lifespan2 - 4 years
Water Parameters
Water TypeFreshwater
PH5.5 - 7.0
GH2 - 6
73 - 77℉
22.8 - 25℃


In the home aquarium, the Blue Striped Rivulus Killifish will readily accept most good quality dried foods such as granules, flakes and sinking pellets. These modern food products have been developed to provide all adequate nutrition to maintain your fish's health and dietary requirements.

Providing additional foodstuffs such as live, frozen, and freeze-dried meals such as bloodworm, daphnia, and tubifex once or twice a week will provide additional benefits to your fish's health and well-being but is not a must for this fish.

It should be noted that bloodworms should only be given as an occasional treat and should not be used as the staple diet as they are difficult for fish to digest and can potentially cause blockages.

This fish is an omnivore in the wild, meaning it will consume some vegetable matter. Although most modern fish foods take this into account and include them in their products, you can still supplement your fish's diet with blanched vegetables such as spinach, broccoli, and zucchini. Ensure you do not overfeed your fish and remove any leftovers the following day.

Sexual Dimorphism

The difference between male and female Blue Striped Rivulus is relatively apparent. Males are larger and much more vibrantly coloured than the females whereas females are smaller and duller and possess spotting rather than a solid colour.

Other Killifish of interest

American Flagfish(Jordanella floridae)
Blackfin Pearl Killifish(Austrolebias nigripinnis)
Bluefin Killifish(Lucania goodei)
Bluefin Notho(Nothobranchius rachovii)
Chevaliers Epiplatys Killifish(Epiplatys chevalieri)
Christys Killifish(Aphyosemion christyi)
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Date Added: 09/12/2020 - Updated: 08/08/2022 19:44:39