A clear, factual reference for aquarists of all experience levels.
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Discover some of the most interesting fish for your aquarium.
Jupiaba kurua
Small South American characin endemic to the upper rio Curuá (rio Xingu basin, Brazil). Reaches about 8.7 cm SL and inhabits clearwater rivers. Distinguished by dark dots on the bases of many lateral scales and a distinct dark caudal‑peduncle spot. Reported diet indicates omnivory, including aquatic insects, small fishes, and fragments of Podostemaceae and filamentous algae.
Amphilius dimonikensis
A small loach catfish endemic to the Mpoulou River in the Mayombe (Dimonika Biosphere Reserve), Republic of the Congo. Amphilius dimonikensis has a subtle banded pattern and inhabits fast, clear streams over rock and sand. In aquaria, prioritize strong, well-oxygenated flow with rounded stones and sand to mimic hillstream conditions.
Japonolycodes abei
Japonolycodes abei is a temperate, deepwater demersal eelpout (family Zoarcidae) endemic to Japan (Kumano-nada Sea reported; other sources also report Sagami Bay and Tosa Bay). It is the only species in the genus Japonolycodes and occurs roughly 40-300 m depth, making it an uncommon/atypical aquarium species.
Enteromius aboinensis
Enteromius aboinensis (the Aboina barb) is a small West African barb with a clean black midline stripe and a little spot right at the base of the tail. It does best when you treat it like a proper schooling fish - keep a decent group and give it plants around the edges with open swimming room in the middle.
Barathronus affinis
Barathronus affinis is a tiny, super-weird deep-sea blind cusk-eel from the western-central Indian Ocean. It is one of those gelatinous, loose-skinned brotula-type fishes that live way down in the dark and are basically never seen alive, so almost everything we know comes from preserved specimens and taxonomic work.
Monodactylus sebae
This is that shiny, diamond-shaped "mono" that cruises around in a tight pack and looks like a little silver dinner plate with black bars when it's young. The big thing with African moonies is they're euryhaline-so they'll tolerate freshwater as juveniles, but they really shine long-term in brackish (and can be transitioned toward marine as they mature). Give them a big, open tank and a group, and they turn into nonstop, super fun midwater swimmers.
Dive into our curated selection of resources to help you on your aquatic journey.
Explore some of our most popular care guides and articles curated for you.
Understand the different types of aquarium filters, including hang-on-back (HOB), canister, and sponge filters. Learn how each works, their pros and cons, and which option is best for your tank setup.
Understand the aquarium nitrogen cycle and how ammonia, nitrite, and nitrate affect fish health. Discover how beneficial bacteria establish in your tank, how cycling works, and how to prevent dangerous water quality issues.
Match fish species by overlapping temperature ranges so you can stock your aquarium with fish that thrive in the same conditions. This guide shows you how to compare ideal ranges, understand safe overlap, and plan a stable community tank built around shared water temperatures.
Take a quiz and find out how much you know about fishkeeping.
Pull up a chair and test your tank-spotting skills. An image will appear for each question... can you name these 5 freshwater fish?
Pull up a stool and test your fish spotter skills... Can you name these 10 popular aquarium fish from a classic hobbyist lineup?
