Carfentanil was used to anaesthetise 46 adult grey seals (Halichoerus grypus) on 78 occasions during two breeding seasons. The mean dose was 9.92 micrograms/kg bodyweight during the first season and 10.22 micrograms/kg during the second. Naloxone hydrochloride was used as the antagonist, averaging 0.53 mg/kg and 1.73 mg/kg over the two periods although the latter is probably unnecessarily high. Ketamine and xylazine at a ratio of 5:1 were also used during the same two seasons, 57 seals being anaesthetised on 104 occasions. The average dose of ketamine was 4.96 mg/kg and 5.15 mg/kg with xylazine in proportion. Complications arose on a number of occasions and these are discussed.
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