SREL Reprint #0577




Relationship of Season, Thermal Loading and Red-sore Disease with Various Haematological Parameters in Micropterus salmoides

Terry 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.

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