Preliminary studies of shellfishes(Tegillarca granosa and Ostrea plicatula) purification technique

Abstract:

Tegillarca granosa and Ostrea plicatula were treated with ozone and chlorine dioxide for purification technique research. The water was changed each five hours during temporary cultivation, and the relative mud spit quantity was weighed after centrifugation. The ozone concentration were 0.4 mg／L, 0.8 mg／L or 1.6 mg／L, respectively ; and the chlorine dioxide concentration were 5 mg／L，10 mg／L or 20 mg／L, respectively. The results show that five hours is enough for mud spit; the total amount of bacteria was reduced to 10%, when shellfish were dipped in 0.4-1.6 mg／L ozone or 5-20mg/L chlorine dioxide for 24 hours，the number of coliform and pathogenic bacteria was brought down from exceeding the standard (GB 18406.4—2001). Packed in plastic bags and stored in refrigerator(5 ℃) , Tegillarca granosa and Ostrea plicatula were still keeping 100% living rate for 10 days. Tegillarca granosa after being purified then frozen was stored at 5 ℃ for 12 days and its microorganism number still met the standard.The concise purification procedure is: temporary cultivation for five hours, then purified with 0.4 mg/L ozone for 24 hours, at last stored in sealed nylon at 5 ℃.