ABSTRACT The study was conducted on September 19 - September 28 2019 in the waters of Kambang, Lengayang Subdistrict, Pesisir Selatan Regency, West Sumatra. The method used in this research is experimental fishing method. The purpose of this study is to determine the effect of using different sizes of fishing lines on the catch of fishing lines. Catches obtained during the 10-day study (10 fi…