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Determining the optimum doses of Kurasan (ethoxiquinolin) and butylhydroxytoluol (BHT) in dry pellets: effect of both anti‐oxidants on some haematological and condition parameters of rainbow trout, Salmo gairdneri Richardson
Author(s) -
ŘEHULKA J.
Publication year - 1989
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/j.1365-2109.1989.tb00355.x
Subject(s) - rainbow trout , zoology , salmo , biology , pellets , pellet , red blood cell , fish <actinopterygii> , fishery , biochemistry , ecology , paleontology
. Kurasan and BHT were tested at doses of 100, 200 and 400mg kg ‐1 incorporated in dry pellets. The administration of these antioxidants did not influence the red blood count of rainbow trout, Salmo gairdneri Richardson, at body weights of 100 to 400g, reared in flow‐through tanks at water temperatures of 7 to 13°C and in cage culture at water temperatures of 15 to 2O°C. In laboratory experiments at a water temperature of 14°C, the highest Kurasan dose increased the red blood cell (RBC) count insignificantly by 14% (1.06 vs 0.93 10 12 1 ‐1 ) after 80 days, haematocrit (PCV) was increased by 27% (0.410 vs 0.32511 ‐1 ), and haemoglobin (Hb) by 16% (72 vs 62gl ‐1 ), This was seen in the cage culture experiment, but not in the experiments in the flow‐through tanks. A trend of diminishing haematological parameters of the red blood count and total blood serum protein (TP) of the fish fed with BHT‐stabilized diet was recorded only under laboratory conditions at the water temperature 9°C, The decline of RBC count in the experimental group with 0.04% BHT represented 14% (0.90 vs 1.05 10 12 1 ‐1 ), the decline in PCV amounted to 18% (0.328 vs 0.39811 ‐1 ), Hb to 17% (57 vs 69g 1 ‐1 ), and TP to 11% (39 vs 44g 1 ‐1 ).