Abstract
We developed an automatic oyster separating machine using high hydrostatic pressure, and conducted research related to improving the working environment and increasing production volume. Changes in the by pressure cast off performance and sensual properties of raw oysters (Crassostrea gigas) treated with high hydrostatic pressure were evaluated. At a pressure of 175 MPa or more, the shell removal rate was over 90%. Samples automatically separated using high hydrostatic pressures of 250 MPa, 200 MPa, and 175 MPa together with a manually separated sample were evaluated using a seven-point rating scale for appearance (color, shape), smell, taste (salty, fishy), texture, and preference. The manually separated sample had similar rating values to the 175 MPa automatically separated sample. In conclusion, it is necessary to continue evaluation of the machine’s performance, sensory evaluation, oyster quality improvement oysters and development of technology for future commercialization.
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