macracanthus, Astatheros
macrochirus, Lepomis
macrolepida, Percina
macrolepis, Cyprinodon
macularius, Cyprinodon
maculata, Allotoca
maculatus, Trinectes
maculatus, Xiphophorus
maculatus, Dormitator
maculatus, Gobiomorus
maculipinnis, Thorichthys
maculosus, Gymnotus
macuspanensis, Rhamdia
malinche, Xiphophorus
managuensis, Parachromis
mandibularis, Tampichthys
marina, Strongylura
marmoratus, Synbranchus
marmoratus, Rivulus
marshi, Gambusia
martinica, Membras
marvelae, Atherinella
maya, Cyprinodon

maylandi, Poecilia
mazatlanus, Achirus
medius, Centropomus
meeki, Cyprinodon
meeki, Allotoca
meeki, Thorichthys
megalotis, Lepomis
melanoccus, Chirostoma
melanops, Dionda
melanopterus, Eucinostomus
melanosoma, Xenotoca
melanurus, Vieja
melas, Ameiurus
meridionalis, Ictalurus
mexicana, Poecilia
mexicanus, Diapterus
mexicanus, Astyanax
mexicanus, Hyporhamphus
mexicanus, Ictalurus
mexicanus, Centropomus
mexicanus, Gobiesox
meyeri, Xiphophorus
mezquital, Chirostoma

microdon, Gobionellus
milleri, Heterophallus
milleri, Xiphophorus
minacae, Gila
minckleyi, Herichthys
mirabilis, Gillichthys
miraflorensis, Microgobius
mitchilli, Anchoa
mixei, Xiphophorus
modesta, Gila
monacha, Poeciliopsis
montezumae, Xiphophorus
monticola, Agonostomus
monticola, Algansea
monticolus, Xiphophorus
monticula archidion, Algansea
moralesi, Hybopsis
multifasciatum, Parachromis
multilineatus, Xiphophorus
multipunctata, Skiffia
multipunctatum, Sicydium
multiradiatus, Girardinichthys
mykiss, Oncorhynchus