Contents Index

The Freezing Time of Fish













Accompanying Notes
Table of Contents


J. NICHOLSON

MINISTRY OF AGRICULTURE, FISHERIES AND FOOD
TORRY RESEARCH STATION

TORRY ADVISORY NOTE No. 62

Crown copyright material is reproduced with the permission of the Controller of Her Majesty's Stationery Office.

This electronic document has been scanned using optical character recognition (OCR) software and careful manual recorrection. Even if the quality of digitalisation is high, the FAO declines all responsibility for any discrepancies that may exist between the present document and its original printed version.


Accompanying Notes


Defines freezing time and explains why it is important. Discusses factors affecting freezing times such as the air speed in a blast freezer, and product temperature, thickness, shape, density, contact area, packaging and water content, and how freezing times can be measured. Notes that estimated freezing times are often inaccurate, and emphasises the importance of measuring actual freezing times during a process, and the significance of errors. Lists measured freezing times for a number of fish products. Read in conjunction with Notes 27 and 94. This Note is relevant to many in this series concerned with aspects of freezing.

(FAO in partnership with Support unit for International Fisheries and Aquatic Research, SIFAR, 2001).


Table of Contents


Introduction
What is freezing time?
How does fish freeze?
Why Measure Freezing Time?
What factors affect freezing time?
How is freezing time measured?
Can freezing times be calculated?
How accurate must a freezing time be?
Specifying freezing time
Freezing times for fish products

Contents Index