a pool of fish, a man made tank that is created to collect water and raise fish (similar to a fish tank) (see Molina)
IPAspelling:
mitʃɑːkɑʃitɬ
Alonso de Molina:
michacaxitl. estanque de peces. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 56r. col. 1. Thanks to Joe Campbell for providing the transcription.