No abstract

The levels of lactate dehydrogenase, hydroxy butyric dehydrogenase, glutamic oxalacetic transaminase, glutamic pyruvic transaminase, glutamate dehydrogenase, alkaline phosphatase and leucine amino peptidase were determined in the plasma of rainbow trout. The protein concentration and the amount of alkaline phosphatase were reduced in starving trout. Fed trout showed reduced lactate dehydrogenase activity. There was a significant correlation between the condition factor, most of the enzyme activities and the protein concentration. At 10 parts per thousand salinity the activities of alkaline phosphatase and leucine amino peptidase were significantly elevated, while lactate dehydrogenase activity was significantly decreased.

Activities of lactate dehydrogenase, hydroxy butyric dehydrogenase, glutamic oxalacetic transaminase, glutamic pyruvic transaminase, glutamate dehydrogenasc, creatinine kinase, alkaline phosphatase, and leucine amino peptidase were determined in the sera of rainbow trout. The animals had previously been adapted to temperatures of 3.5, 6, 8, 10, 12.5, 15, 17, 19, 21.5 and 23" C . Most of the enzyme activity increased with the rise in temperature. The activity of alkaline phosphatase decreased in the range 6-19' C , while the changes in the glutamate dehydrogenase activity took a complex course. The results Are compared with the findings of other authors.

No abstract

180 rainbow trouts (Salmo gairdneri RICH .), aged from 1 to 3 years, were examined for fluctuations, caused by age and season, by means of colour index (CI), mean corpuscular hemoglobin (MCH), and mean corpuscular hemoglobin concentration (MCHC) .CI and MCH behave similarly . Both are increasing until the 2nd year and stay relatively constant thereafter . If the gender is not considered -there are no significant differences in the values of males and females -the CI increases from 1,4 in the first year over 1,6 to 1,7 in the age of 3 years, and the MCH increases from 44,4 yy over 52,6 yy, 56,8 yy, 58,1 yy to 55,5 yy .