Channa gachua: Head and isthmus region magnified ventrally. Mark ‘U’- shaped Isthmus (yellow arrow) and presence of a big scale (blue arrow) on the lower jaw (more anteriorly to the ariculation of jaws). Ventral cephalic sensory pores arranged singly (red arrows). Pelvic fins shorter (orange arrow).

Channa gachua: Head and isthmus region magnified ventrally. Mark ‘U’- shaped Isthmus (yellow arrow) and presence of a big scale (blue arrow) on the lower jaw (more anteriorly to the ariculation of jaws). Ventral cephalic sensory pores arranged singly (red arrows). Pelvic fins shorter (orange arrow).