1. Introduction
In recent years, Hazard Analysis Critical Control Point
(HACCP) systems have been actively adopted by the aquatic
food industry. In the field of aquaculture involved in supplying
fish, use of HACCP is under close examination for producing
healthy fish. Mass outbreaks of pathogenic bacterial infections
have killed large quantities of fish in recent years, causing great
financial damage to fish farms. In addition, from the perspective
of food hygiene for delivering safe fish to markets, farming fish
with minimal dependence on antibiotics is important. Periodic
checks of fish health and detection of abnormalities as quickly
as possible are thus necessary at fish farms. Several studies
have shown blood glucose levels closely correlate to the level
of stress in fish and represent the state of respiratory or