Masculinization of betta fish Betta splendens by embryo immersion in extract of purwoceng Pimpinella alpina - Arfah, Harton; Departemen Budidaya Perairan, Fakultas Perikanan dan Ilmu Kelautan, Institut Pertanian Bogor Kampus IPB Dramaga Bogor 16680 (ISSA, 2015)