One day beforeammonia exposure started (day 0), the fish fromtwo
tanks were sampled. After 34 days exposure to ammonia, the fish from
the 10 remaining tanks were sampled (two tanks for each of the five
treatments, 12 fish per tank). Fish were rapidly caught with a net and
quickly anaesthetised in 0.1% (v/v) 2-phenoxyethanol (Sigma, St. Louis,
USA). Within two minutes, blood had been taken by puncture of the
caudal vein using a lithium heparinised Vacuette blood collection
system (Greiner Bio-One GmbH, Kremsmünster, Austria). The blood
was centrifuged for 10 min (14,000×g, 4 °C) and the plasma obtained
was stored at −20 °C.
One day beforeammonia exposure started (day 0), the fish fromtwotanks were sampled. After 34 days exposure to ammonia, the fish fromthe 10 remaining tanks were sampled (two tanks for each of the fivetreatments, 12 fish per tank). Fish were rapidly caught with a net andquickly anaesthetised in 0.1% (v/v) 2-phenoxyethanol (Sigma, St. Louis,USA). Within two minutes, blood had been taken by puncture of thecaudal vein using a lithium heparinised Vacuette blood collectionsystem (Greiner Bio-One GmbH, Kremsmünster, Austria). The bloodwas centrifuged for 10 min (14,000×g, 4 °C) and the plasma obtainedwas stored at −20 °C.
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