Erythrocyte volume distribution in rainbow trout.

Area of Science:

• Aquatic biology
• Fish hematology
• Comparative physiology

Background:

• Erythrocyte parameters are crucial indicators of fish health.
• Understanding red blood cell (RBC) volume and heterogeneity is vital for assessing fish physiology.
• Limited data exists on rainbow trout erythrocyte characteristics.

Purpose of the Study:

• To establish reference values for mean corpuscular volume (MCV) and erythrocyte volume heterogeneity in rainbow trout.
• To analyze the distribution and characteristics of RBCs in this species.
• To provide a baseline for future hematological studies in rainbow trout.

Main Methods:

• Utilized an electronic particle counter for erythrocyte counting and volume measurement.
• Employed a particle-size analyzer and microcomputer for detailed analysis.
• Analyzed erythrogram curves for volume distribution patterns.

Main Results:

• Mean erythrocyte count: 1.5 x 10^6 +/- 0.16 x 10^6 cells/microliter.
• Mean corpuscular volume (MCV): 346 +/- 25 fl.
• Mean coefficient of variation for erythrocyte volumes: 29 +/- 2.3%, indicating significant heterogeneity.
• Erythrogram curves were right-skewed, with 15.6 +/- 3.5% of cells representing larger volumes.

Conclusions:

• Rainbow trout erythrocytes exhibit considerable volume heterogeneity.
• Established reference ranges for key RBC parameters in rainbow trout.
• Findings contribute to the understanding of fish hematology and provide a basis for health assessments.