The effect of temperature on non-specific defence parameters of three strains of juvenile Atlantic halibut (Hippoglossus hippoglossus L.)
A.L.
Langston, R. Hoare, M. Stefansson,
R. Fitzgerald, H. Wergeland, M. Mulcahy- 2002
Fish &
Shellfish Immunology, 12(1): 61-76
Abstract:
The effect of temperature (8, 12, 15 and
18°C) on a variety of non-specific defence and haematological
parameters was examined in three geographically distinct
reared strains (Canadian, Icelandic, Norwegian) of
Atlantic halibut. The results indicate that temperature
exerts a considerable influence on some blood parameters
(packed cell volume and the percentage population of
leucocytes in peripheral blood) and on some humoral
parameters (serum lysozyme activity and serum protein
levels) of halibut. A high temperature of 18°C caused
a decrease in the number of circulating blood cells
and an increase in serum lysozyme levels; effects
consistent with those reported within the literature
for stress. The different strains of halibut exhibited
differing responses with respect to differential counts
of peripheral blood lymphocytes and thrombocytes, and
to serum protein concentrations, serum lysozyme
activity, serum iron content, unsaturated iron binding
capacity of serum and O-2 production by kidney macrophages.
(Aquaculture
Development Centre, Department of Zoology & Animal Ecology, National
University of Ireland, Lee Maltings, Cork, Ireland)