Ketebalan Lapisan Bagian Puncak dan Dasar Mutiara Kerang Mabe (Pteria penguin) Sansibar Sansibar, Yusnaini Yusnaini, Muhammad Idris JSIPi (Jurnal Sains dan Inovasi Perikanan) (Journal of Fishery Science and Innovation) Vol. 4 No. 2 2020 DOI 10.33772/jsipi.v4i2.13123