This study supplemented the way of sex determination fish based on regression relationship some morphological indicators Mystus mysticetus. A total 425 specimens were collected by trawl nets at Cai Rang - Can Tho and Long Phu Soc Trang from January to July 2022. After collection, transferred laboratory determine their length (TL), standard (SL), eye diameter (ED), distance (DE), body height (BD...