|SREL Reprint #0577|
of Season, Thermal Loading and Red-sore Disease with Various Haematological
Parameters in Micropterus salmoides
C. Hazen, Gerald W. Esch, Armand B. Glassman and J. Whitfield Gibbons
One hundred and fifty largemouth bass (Micropterus
salmoides) were caught during the mid-winter and mid-summer months in Par
Pond, an 1120 ha cooling reservoir located on Savannah River Plant near Aiken,
SC. Equal numbers of fish were
taken from ambient and thermally altered (>10C ambient) areas of the lake.
The total length and weight of each bass was noted, along with the
presence or absence of lesions associated with red-sore disease (caused by the
bacerium, Aeromonas hydrophila and the ciliate, Epistylis sp.).
Blood was drawn, by heart puncture, from each bass and the following
haematological parameters measured: haematocrit,
haemoglobin, iron, total iron-binding capacity, thyroxine, sodium and potassium.
Only the total iron-binding capacity was significantly higher in bass
with red-sire disease; none of the other blood parameters were significantly
higher in bass with red-sore disease; none of the other blood parameters were
significantly different in infected and uninfected bass.
Bass from thermally altered locations had consistently higher
haematocrits during both summer and winter.
Bass from thermal and ambient locations were not different with respect
to iron, iron-binding capacity, sodium or potassium levels.
However, bass taken during summer months had higher levels of circulating
iron than individuals in winter months. Summer
bass had higher thyroxine levels than bass in winter.
These results are discussed in terms of their relationship to red-sore
disease, season and the impact of thermal effluent.
SREL Reprint #0577
Hazen, T.C., G.W. Esch, A.B. Glassman, and J.W. Gibbons. 1978. Relationship of season, thermal loading and red sore disease with various haematological parameters in Micropterus salmoides. Journal of Fish Biology 12:491-498.