Vertical distribution of blue Shark (Prionace glauca) in The Indian Ocean Fathur Rochman, Gussasta Levi Arnenda, Arief Wujdi and Roy Kurniawan E3S Web Conf., 322 (2021) 01009 Published online: 11 November 2021 DOI: 10.1051/e3sconf/202132201009