Use of Refrigerated-seawater Spray in Keeping Haliotis discus hannai Alive at Ecological Ice Temperature
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Abstract:
The ice temperature zone of hannai was obtained by measuring its freezing curve and then the technologies for keeping Halitotis discus hannai alive at ecological ice temperature were investigated. Results show that the survival rate of Haliotis discus hannai is the highest while it was kept alive at ecological ice temperature (-1.5 ℃~0 ℃). The treatments by gradient freezing, refrigerated seawater spray, cleaning and oxygen supplement were good for Haliotis discus hannai’s survival rate improvement. The best processing conditions for keeping alive were: cleaning Haliotis discus hannai ,then gradient freezing it to ecological ice temperature by spraying refrigerated seawater with oxygen supplely, and continuing spraying refrigerated seawater and supplying oxygen and moisture environment during the keeping-alive stage. Key words: Haliotis discus hannai; ecological ice temperature; keeping alive; refrigerated seawater spraying
