Calcium content in ash of shell was the highest 64.9% in Anadarac tegillarca granosa ashed for 5 hr at ... Calcium contents in calcium carbonates made with shells of Anadarac tegillarca granosa by using ammonium ... The shells of Anadarac tegillarca granosa, Crassostrea gigas, Crassostrea nippona, and Patinopecten yessoensis