Freshwater aquarium fish: M
All freshwater fish whose common name starts with M, in alphabetical order. Each card links to its care guide.
122 species
Maclareni pungu
Pungu maclareni
Freshwater4.7 in (12 cm) · 53 gal (200 L)73–81°F (23–27°C)
Macmaster's dwarf cichlid
Apistogramma macmasteri
Freshwater2.4 in (6 cm) · 20 gal (75 L)75–82°F (24–28°C)
Macushi pleco
Hypostomus macushi
Freshwater7.9 in (20 cm) · 79 gal (300 L)77–84°F (25–29°C)
Mad barb
Leptobarbus hoevenii
Freshwater23.6 in (60 cm) · 317 gal (1,200 L)72–82°F (22–28°C)
Madagascar rainbowfish
Bedotia madagascariensis
Freshwater3.3 in (8.5 cm) · 45 gal (170 L)73–90°F (23–32°C)
Madre de Dios tetra
Hyphessobrycon nigricinctus
Freshwater1.6 in (4 cm) · 15 gal (55 L)72–81°F (22–27°C)
Mae Klong spiny eel
Macrognathus meklongensis
Freshwater9.8 in (25 cm) · 70 gal (265 L)73–82°F (23–28°C)
Mafia killifish
Nothobranchius korthausae
Freshwater2 in (5 cm) · 10 gal (38 L)72–79°F (22–26°C)
Magnificent killifish
Hypsolebias magnificus
Freshwater2 in (5 cm) · 10 gal (38 L)72–79°F (22–26°C)
Mahachai betta
Betta mahachaiensis
Freshwater2.4 in (6 cm) · 10 gal (38 L)72–82°F (22–28°C)
Maharaja barb
Puntius sahyadriensis
Freshwater3.5 in (9 cm) · 29 gal (110 L)68–79°F (20–26°C)
Malabar baril
Opsarius malabaricus
Freshwater4.3 in (11 cm) · 42 gal (160 L)68–79°F (20–26°C)
Malabar danio
Devario malabaricus
Freshwater5.1 in (13 cm) · 48 gal (180 L)64–77°F (18–25°C)
Malawi barracuda
Rhamphochromis cf. macrophthalmus
Freshwater9.8 in (25 cm) · 79 gal (300 L)73–81°F (23–27°C)
Malawi eyebiter
Dimidiochromis compressiceps
Freshwater9.8 in (25 cm) · 66 gal (250 L)73–82°F (23–28°C)
Malawi hawk cichlid
Aristochromis christyi
Freshwater11.8 in (30 cm) · 159 gal (600 L)75–81°F (24–27°C)
Malawi sand diver
Fossorochromis rostratus
Freshwater11 in (28 cm) · 119 gal (450 L)75–82°F (24–28°C)
Malawi spiny eel
Mastacembelus shiranus
Freshwater10.2 in (26 cm) · 66 gal (250 L)75–81°F (24–27°C)
Malawi thick-lip
Cheilochromis euchilus
Freshwater13.8 in (35 cm) · 159 gal (600 L)75–81°F (24–27°C)
Malawi trout cichlid
Champsochromis caeruleus
Freshwater12.6 in (32 cm) · 185 gal (700 L)75–81°F (24–27°C)
Malay combtail gourami
Belontia hasselti
Freshwater7.9 in (20 cm) · 45 gal (170 L)70–79°F (21–26°C)
Malayan harlequin rasbora
Trigonostigma truncata
Freshwater1.2 in (3 cm) · 14 gal (54 L)72–81°F (22–27°C)
Malayan leaf fish
Pristolepis fasciata
Freshwater7.9 in (20 cm) · 40 gal (150 L)73–82°F (23–28°C)
Malayan lizard loach
Homaloptera parclitella
Freshwater3.9 in (10 cm) · 29 gal (110 L)70–79°F (21–26°C)
Mandarin rhinogobius
Rhinogobius brunneus
Freshwater2.4 in (6 cm) · 14 gal (54 L)64–75°F (18–24°C)
Mandor betta
Betta mandor
Freshwater2.6 in (6.5 cm) · 14 gal (54 L)72–81°F (22–27°C)
Mango loach
Physoschistura mango
Freshwater1 in (2.5 cm) · 11 gal (40 L)68–77°F (20–25°C)
Mango pleco
Baryancistrus chrysolomus
Freshwater11.8 in (30 cm) · 119 gal (450 L)81–88°F (27–31°C)
Manipur barb
Pethia manipurensis
Freshwater1.8 in (4.5 cm) · 14 gal (54 L)68–77°F (20–25°C)
Many-spotted cory
Hoplisoma polystictum
Freshwater1.6 in (4 cm) · 15 gal (55 L)72–81°F (22–27°C)
Marble whiptail
Loricaria simillima
Freshwater10.2 in (26 cm) · 66 gal (250 L)75–82°F (24–28°C)
Marbled bichir
Polypterus palmas
Freshwater13.8 in (35 cm) · 53 gal (200 L)75–82°F (24–28°C)
Marbled goby
Oxyeleotris marmorata
FreshwaterBrackish23.6 in (60 cm) · 145 gal (550 L)72–82°F (22–28°C)
Marbled hatchetfish
Carnegiella strigata
Freshwater1.6 in (4 cm) · 32 gal (120 L)68–82°F (20–28°C)
Marbled headstander
Abramites hypselonotus
Freshwater5.5 in (14 cm) · 70 gal (265 L)68–86°F (20–30°C)
Marbled helogenes
Helogenes marmoratus
Freshwater3.1 in (8 cm) · 14 gal (54 L)73–82°F (23–28°C)
Marbled leiocassis
Leiocassis poeciloptera
Freshwater6.7 in (17 cm) · 40 gal (150 L)73–82°F (23–28°C)
Marbled sailfin pim
Leiarius marmoratus
Freshwater39.4 in (100 cm) · 528 gal (2,000 L)72–79°F (22–26°C)
Marbled spiny eel
Mastacembelus favus
Freshwater19.7 in (50 cm) · 119 gal (450 L)75–82°F (24–28°C)
Marbled swamp eel
Synbranchus marmoratus
Freshwater39.4 in (100 cm) · 119 gal (450 L)72–82°F (22–28°C)
Marbled talking catfish
Amblydoras nauticus
Freshwater4.3 in (11 cm) · 30 gal (112 L)73–82°F (23–28°C)
Marbled tandanus catfish
Tandanus tandanus
Freshwater31.5 in (80 cm) · 185 gal (700 L)61–79°F (16–26°C)
Margitae tetra
Hyphessobrycon margitae
Freshwater1.9 in (4.8 cm) · 16 gal (60 L)72–81°F (22–27°C)
Marilyn's pencilfish
Nannostomus marilynae
Freshwater2 in (5 cm) · 14 gal (54 L)73–81°F (23–27°C)
Marlier's goby cichlid
Spathodus marlieri
Freshwater3.9 in (10 cm) · 42 gal (160 L)75–81°F (24–27°C)
Marlier's julie
Julidochromis marlieri
Freshwater5.9 in (15 cm) · 29 gal (110 L)73–81°F (23–27°C)
Maroni eartheater
Geophagus harreri
Freshwater8.7 in (22 cm) · 119 gal (450 L)77–84°F (25–29°C)
Marsh puffer
Pao brevirostris
Freshwater5.5 in (14 cm) · 42 gal (160 L)75–82°F (24–28°C)
Martin's dwarf cichlid
Apistogramma martini
Freshwater1.6 in (4 cm) · 15 gal (55 L)73–81°F (23–27°C)
Martorell's barb
Enteromius martorelli
Freshwater3.5 in (9 cm) · 24 gal (90 L)72–81°F (22–27°C)
Marungu cichlid
Neolamprologus marunguensis
Freshwater2.8 in (7 cm) · 29 gal (110 L)75–81°F (24–27°C)
Mascara barb
Dawkinsia assimilis
Freshwater4.7 in (12 cm) · 53 gal (200 L)66–77°F (19–25°C)
Masked cory
Hoplisoma metae
Freshwater2 in (5 cm) · 15 gal (55 L)70–79°F (21–26°C)
Masked dwarf cichlid
Apistogramma personata
Freshwater2.6 in (6.5 cm) · 16 gal (60 L)77–84°F (25–29°C)
Masked julie
Julidochromis transcriptus
Freshwater2.8 in (7 cm) · 20 gal (75 L)75–81°F (24–27°C)
Matano ricefish
Oryzias matanensis
Freshwater2.2 in (5.5 cm) · 20 gal (75 L)72–79°F (22–26°C)
Mayan cichlid
Mayaheros urophthalmus
FreshwaterBrackish11.8 in (30 cm) · 90 gal (340 L)75–86°F (24–30°C)
Mayan tetra
Hyphessobrycon compressus
Freshwater1.8 in (4.5 cm) · 16 gal (60 L)68–79°F (20–26°C)
Mayland's zebra
Maylandia hajomaylandi
Freshwater4.7 in (12 cm) · 66 gal (250 L)75–82°F (24–28°C)
Mbenji zebra
Maylandia mbenjii
Freshwater4.3 in (11 cm) · 53 gal (200 L)75–82°F (24–28°C)
Mbu puffer
Tetraodon mbu
Freshwater26.4 in (67 cm) · 396 gal (1,500 L)75–82°F (24–28°C)
Mdoka peacock
Aulonocara aquilonium
Freshwater5.1 in (13 cm) · 53 gal (200 L)75–82°F (24–28°C)
Medaka
Oryzias latipes
Freshwater1.4 in (3.5 cm) · 9 gal (35 L)61–72°F (16–22°C)
Medusa pleco (L034)
Ancistrus ranunculus
Freshwater5.9 in (15 cm) · 40 gal (150 L)79–86°F (26–30°C)
Mees' antenna catfish
Brachyrhamdia meesi
Freshwater2.4 in (6 cm) · 30 gal (112 L)73–82°F (23–28°C)
Meetan catfish
Mystus rufescens
Freshwater5.9 in (15 cm) · 66 gal (250 L)73–81°F (23–27°C)
Mega clown pleco (L340)
Hypancistrus sp. L340
Freshwater3.5 in (9 cm) · 20 gal (75 L)79–86°F (26–30°C)
Meghalaya danio
Danio meghalayensis
Freshwater2.4 in (6 cm) · 24 gal (90 L)64–75°F (18–24°C)
Mekong archerfish
Toxotes mekongensis
Freshwater7.9 in (20 cm) · 106 gal (400 L)75–84°F (24–29°C)
Mekong glass sheatfish
Kryptopterus limpok
Freshwater11.8 in (30 cm) · 119 gal (450 L)73–81°F (23–27°C)
Mekong lizard loach
Homaloptera confuzona
Freshwater3.2 in (8.2 cm) · 24 gal (90 L)70–81°F (21–27°C)
Mekong ricefish
Oryzias mekongensis
Freshwater1.2 in (3 cm) · 11 gal (40 L)72–79°F (22–26°C)
Mekong tiger perch
Datnioides undecimradiatus
Freshwater15.7 in (40 cm) · 119 gal (450 L)75–82°F (24–28°C)
Melanostichos tetra
Hyphessobrycon melanostichos
Freshwater1.7 in (4.4 cm) · 16 gal (60 L)72–81°F (22–27°C)
Melanzona guppy
Poecilia parae
FreshwaterBrackish2 in (5 cm) · 15 gal (55 L)75–82°F (24–28°C)
Melon barb
Haludaria fasciata
Freshwater2.8 in (7 cm) · 40 gal (150 L)72–79°F (22–26°C)
Mendez's dwarf cichlid
Apistogramma mendezi
Freshwater2 in (5 cm) · 16 gal (60 L)79–86°F (26–30°C)
Meridionalis eartheater
Gymnogeophagus meridionalis
Freshwater4.3 in (11 cm) · 53 gal (200 L)61–79°F (16–26°C)
Merry widow livebearer
Phallichthys amates
Freshwater2.5 in (6.4 cm) · 16 gal (60 L)72–86°F (22–30°C)
Metallic livebearer
Girardinus metallicus
Freshwater2.4 in (6 cm) · 11 gal (40 L)72–81°F (22–27°C)
Micro bumblebee goby
Brachygobius nunus
FreshwaterBrackish1 in (2.5 cm) · 5 gal (20 L)73–82°F (23–28°C)
Micro rasbora
Boraras micros
Freshwater0.6 in (1.5 cm) · 8 gal (30 L)72–79°F (22–26°C)
Microphthalmus cichlid
Chuco microphthalmus
Freshwater11.8 in (30 cm) · 119 gal (450 L)75–84°F (24–29°C)
Micropterus tetra
Hyphessobrycon micropterus
Freshwater1.3 in (3.2 cm) · 12 gal (45 L)72–81°F (22–27°C)Midas betta
Betta midas
Freshwater2.6 in (6.6 cm) · 20 gal (75 L)72–82°F (22–28°C)
Midas cichlid
Amphilophus citrinellus
Freshwater13.8 in (35 cm) · 79 gal (300 L)70–79°F (21–26°C)
Midnight catfish
Auchenipterichthys coracoideus
Freshwater4.3 in (11 cm) · 20 gal (75 L)72–77°F (22–25°C)
Miguelito cory
Brochis virginiae
Freshwater2.4 in (6 cm) · 20 gal (75 L)72–79°F (22–26°C)
Mikolji's oscar
Astronotus mikoljii
Freshwater11.4 in (29 cm) · 132 gal (500 L)77–86°F (25–30°C)
Millennium rainbowfish
Glossolepis pseudoincisa
Freshwater3.6 in (9.2 cm) · 42 gal (160 L)75–84°F (24–29°C)
Mini bumblebee goby
Brachygobius xanthomelas
Freshwater0.8 in (2 cm) · 5 gal (20 L)75–82°F (24–28°C)
Mini shark cat
Pseudeutropius brachypopterus
Freshwater4.3 in (11 cm) · 30 gal (112 L)73–82°F (23–28°C)
Mini zebra loach
Yunnanilus pulcherrimus
Freshwater2 in (5 cm) · 14 gal (54 L)64–75°F (18–24°C)
Miniopinna betta
Betta miniopinna
Freshwater1.1 in (2.8 cm) · 11 gal (40 L)72–81°F (22–27°C)
Mirabilis eartheater
Geophagus mirabilis
Freshwater7.9 in (20 cm) · 106 gal (400 L)77–84°F (25–29°C)
Mixteco cichlid
Thorichthys panchovillai
Freshwater4.7 in (12 cm) · 53 gal (200 L)75–84°F (24–29°C)
Mloto utaka
Copadichromis trewavasae
Freshwater5.1 in (13 cm) · 79 gal (300 L)75–81°F (24–27°C)
Mokele-mbembe bichir
Polypterus mokelembembe
Freshwater10.6 in (27 cm) · 79 gal (300 L)75–82°F (24–28°C)
Moniliger tetra
Hyphessobrycon moniliger
Freshwater1.5 in (3.7 cm) · 15 gal (55 L)72–82°F (22–28°C)
Monoculus peacock bass
Cichla monoculus
Freshwater27.6 in (70 cm) · 528 gal (2,000 L)77–86°F (25–30°C)
Monogram dwarf pike
Teleocichla monogramma
Freshwater3.1 in (8 cm) · 29 gal (110 L)79–86°F (26–30°C)
Montag's tetra
Hyphessobrycon montagi
Freshwater1.5 in (3.7 cm) · 15 gal (55 L)73–82°F (23–28°C)
Montezuma swordtail
Xiphophorus montezumae
Freshwater5.5 in (14 cm) · 32 gal (120 L)68–79°F (20–26°C)
Moolenburgh's glass catfish
Pseudeutropius moolenburghae
Freshwater3.9 in (10 cm) · 30 gal (112 L)73–82°F (23–28°C)
Moonlight gourami
Trichopodus microlepis
Freshwater5.9 in (15 cm) · 30 gal (115 L)77–86°F (25–30°C)
Moore's lamprologus
Variabilichromis moorii
Freshwater4.3 in (11 cm) · 53 gal (200 L)75–81°F (24–27°C)
Moray kuhli loach
Pangio muraeniformis
Freshwater2.4 in (6 cm) · 20 gal (75 L)72–81°F (22–27°C)
Mosaic cory
Brochis haraldschultzi
Freshwater2.8 in (7 cm) · 20 gal (75 L)75–82°F (24–28°C)
Mottled bushfish
Ctenopoma weeksii
Freshwater4.7 in (12 cm) · 42 gal (160 L)73–82°F (23–28°C)
Mount Nimba lampeye
Rhexipanchax nimbaensis
Freshwater1.8 in (4.5 cm) · 14 gal (54 L)68–75°F (20–24°C)
Mountain grunter
Hephaestus habbemai
Freshwater5.9 in (15 cm) · 70 gal (265 L)64–79°F (18–26°C)
Moustached danio
Danio dangila
Freshwater5.1 in (13 cm) · 32 gal (120 L)68–79°F (20–26°C)
Mouth almighty
Glossamia aprion
Freshwater7.1 in (18 cm) · 79 gal (300 L)72–86°F (22–30°C)
Mpanga red-top zebra
Maylandia emmiltos
Freshwater4.1 in (10.5 cm) · 53 gal (200 L)75–82°F (24–28°C)
Multidens cichlid
Heterochromis multidens
Freshwater11.8 in (30 cm) · 159 gal (600 L)73–82°F (23–28°C)
Multie shell dweller
Neolamprologus multifasciatus
Freshwater1.8 in (4.5 cm) · 20 gal (75 L)75–81°F (24–27°C)
Multifilis threadfin
Polynemus multifilis
Freshwater11 in (28 cm) · 159 gal (600 L)75–84°F (24–29°C)
Mungo blue benitochromis
Benitochromis finleyi
Freshwater3.7 in (9.5 cm) · 42 gal (160 L)73–81°F (23–27°C)
Mustache lamprologus
Neolamprologus mustax
Freshwater3.5 in (9 cm) · 42 gal (160 L)75–81°F (24–27°C)
Mustache synodontis
Synodontis membranaceus
Freshwater18.1 in (46 cm) · 264 gal (1,000 L)73–82°F (23–28°C)
Mwanza dung hap
Enterochromis coprologus
Freshwater3.5 in (9 cm) · 42 gal (160 L)73–81°F (23–27°C)
Myers' caquetaia
Caquetaia myersi
Freshwater9.1 in (23 cm) · 119 gal (450 L)73–82°F (23–28°C)
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