Search Species
Search for fish species by common or scientific name, or use filters to browse by water type, size, temperament, and difficulty.
Found 654 species
Lowe's tetra
Hyphessobrycon loweae
This is a tiny Upper Xingu tetra that can glow gold in the right light, with males showing that cool elongated dorsal fin. It does best when you keep a real group and give it a calm, planted setup so it feels bold enough to come out and color up.
Lucap sole
Zebrias lucapensis
A small marine demersal sole (family Soleidae) described from Lucap Bay / Hundred Islands area of Lingayen Gulf, Philippines; known from very limited records. Aquarium care information is not species-specific in the literature; if kept, husbandry would likely follow general small marine sole/flatfish needs (fine sand, peaceful tankmates, benthic meaty foods).
Mabahiss lightfish
Vinciguerria mabahiss
Vinciguerria mabahiss is a tiny deepwater lightfish from the Red Sea that uses rows of photophores (light organs) for counter-illumination - basically a living stealth mode in the midwater dark. Its whole lifestyle is mesopelagic (open-water, deep), so its "care" is really more science-lab territory than home aquarium stuff.
Macedonia shad
Alosa macedonica
Landlocked shad endemic to northern Greece; formerly occurred in Lakes Volvi and Koronia but now restricted to Lake Volvi. Spawning occurs in summer (July–August) and begins around 19–20 °C.
Maculate panray
Zanobatus maculatus
Zanobatus maculatus is a small coastal panray from the Gulf of Guinea with a blotchy, spotted top-side pattern and a bottom that can look pale/creamy to orange-brown. It is a demersal (bottom-living) marine ray that hangs out on sandy (and often muddy) shallows, and it is mostly a bycatch species in local fisheries rather than something you will realistically see in the aquarium trade.
Maltzan's goby
Wheelerigobius maltzani
This is a tiny West African coastal goby that lives right down on the bottom in warm, shallow inshore water. Its big appeal is the "little predator" vibe - it perches, scoots, and hugs structure like a classic goby, but its real-world habitat is marine shoreline rather than a typical freshwater community setup.
Mandarinfish
Synchiropus splendidus
This is the classic mandarin dragonet-the little reef crawler that looks like someone hand-painted neon blue and orange squiggles onto a fish. It spends basically all day pecking at live rock for tiny pods, and at dusk you can sometimes catch the pair-spawning "rise" if you keep a bonded male/female. Absolutely reef-safe, but it's one of those fish that does amazing only when the tank is truly mature and full of microfauna.
Mandeville's loach catfish
Zaireichthys mandevillei
This is a tiny little Congo River loach catfish that stays about an inch long, with a bold dark collar right behind the head and a speckly pattern. Its basically built for life in moving water - it likes to tuck into sand and squeeze around rocks - so its a super cool "micro-catfish" for a river-style setup if you can actually source one.
Mandi
Rhamdioglanis frenatus
Rhamdioglanis frenatus is a freshwater heptapterid catfish endemic to Brazil's Atlantic Forest coastal drainages (SE Atlantic). It reaches about 22 cm total length and is primarily carnivorous; in aquaria it is expected to appreciate ample shelter and floor space, though detailed species-specific husbandry data is scarce.
Manglolo
Sicydium bustamantei
This is a rock-hugging stream goby from the Gulf of Guinea islands that lives in clear, fast water and sends its larvae out to sea before they return upstream. It scrapes algae and diatoms off stones with its sucker mouth and will clamber around rocks all day, but it almost never shows up in the hobby and really needs a high-flow river setup to do well.
Marlin-spike grenadier
Nezumia bairdii
Marlin-spike grenadier is a deep-sea rat-tail with a long whip tail and big eyes, cruising over soft bottoms on the Atlantic slope. You see it from Newfoundland down to Florida in near-freezing water hundreds of meters down, picking off krill, amphipods, and worms. Super cool to spot on ROV dives, but not a fish for home aquariums.
Marquesas dwarf flounder
Engyprosopon marquisense
This is a tiny deepwater lefteye flounder from the Marquesas Islands - one of those little sand-hugging ambush fish that looks like a leaf until it moves. Super cool biologically, but honestly not a realistic home-aquarium fish since it comes from 108-408 m depths and there is basically no established hobby care info for the species.