title: Seasonal variation of serum lysozyme levels in Atlantic halibut (Hippoglossus hippoglossus L.).
abstract: Serum lysozyme was measured in Atlantic halibut (Hippoglossus hippoglossus L.) kept in a range of different conditions that included ambient photoperiod and temperature and controlled photoperiod and temperature. There was no significant difference between animals held in ambient conditions of 6 degrees C and those held in controlled conditions of 12 degrees C. Similarly, there was no significant difference between animals maintained in a long day photoperiod and those in a short day photoperiod. However, there was a significant difference between summer and winter readings. Whilst this would indicate a link between season and the defence system, there appears to be no link with apparent entrainment to different photoperiods and serum lysozyme levels.
authors.affiliation: FRS Marine Laboratory, PO Box 101, 375 Victoria Road, Aberdeen AB11 9DB, Scotland, UK. t.j.bowden@marlab.ac.uk
authors.forename: T J
authors.initials: TJ
authors.lastname: Bowden
authors.forename: R
authors.initials: R
authors.lastname: Butler
authors.forename: I R
authors.initials: IR
authors.lastname: Bricknell
mesh_terms: D000818:Animals; D005432:Flounder / Q000097:blood*; D008837:Micrococcus; D009113:Muramidase / Q000097:blood*; D009391:Nephelometry and Turbidimetry; D017440:Photoperiod; D012621:Seasons; D013696:Temperature
chemical_list: D009113:Muramidase