Abstract
Stress reactions in marine fish were studied in detrmining the effects of environmental salinity changes on the haematology of the red aes bream, Chrysophrys major TEMMINCK et SCHLEGEL. Acute elevation in environemtal salinity induced hyperglycemia, increase of serum cortisol levels of the fish. The fish exposed to acute salinity lowering showed hyperglycemia, increase of serum cortisol level and high haemeatocrit values with low sodium and chloride levels. It was confirmed that these haematological changes depended on the intensity and the rate of salinity change. The determination of the phases in stress reactions was examined through the use of Euclidean distances calculated by 3 variables; mean haematocrit value, mean glucose level and mean serum sodium level. They were recognized to include control phase, reactive phase where the hyperglycemia was noticeable and exhausitive phase where serum sodium level was remarkably influenced by environmental salinity. These phases were considered to be slightly affected by stimuli-specific reactions of the fish.
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