caa a22 4500 477117228 CHVBK 20180405111626.0 cr unu---uuuuu 170330e19960801xx s 000 0 eng 10.1007/BF02112361 doi (NATIONALLICENCE)springer-10.1007/BF02112361 The nature of hematological response in fish [Elektronische Daten] Studies on rainbow trout Oncorhynchus mykiss exposed to simulated winter, spring and summer conditions [A. Houston, N. Dobric, R. Kahurananga] Hematological status was examined in rainbow trout,Oncorhynchus mykiss, held for 3-4 weeks under temperature, photoperiod and PO 2 conditions approximating those of their winter, spring and summer habitats. The most striking change observed was in red cell population composition. In ‘winter' fish mature cells were predominant; juvenile and developing erythrocytes characterized ‘spring' and ‘summer' animals. Hemoglobin, hematocrit and both mean erythrocytic volume and hemoglobin were modestly lower in ‘spring' and ‘summer' than in ‘winter' fish. Red cell numbers were not significantly affected. These observations suggest that avoidance of viscosity-based increases in circulatory work cost is more advantageous than elevation of blood O2-carrying capacity. Although hemoglobin isomorph profiles were significantly altered, there is little evidence that such changes are of critical adaptive importance. Given presumed age-based reduction in gas transport effectiveness, the replacement of mature and senescent cells by more metabolically-competent juvenile cells appears to be the pivotal event in hematological response. Leucocyte counts were significantly elevated in ‘spring' and ‘summer' as compared to ‘winter' fish. Lymphocyte/heterophil ratios declined from 8.27 in ‘winter' fish to 3.13 in ‘summer' trout. Thrombocyte, monocyte, eosinophil and basophil abundances were little changed. Kugler Publication bv Amsterdam, 1996 hematology nationallicence erythron organization nationallicence leucon organization nationallicence hemoglobin isomorphs nationallicence seasonal acclimation nationallicence rainbow trout nationallicence Oncorhynchus mykiss nationallicence Houston A. Department of Biological Sciences, Brock University, L2S 3A1, St. Catharines, ON, Canada aut Dobric N. Department of Biological Sciences, Brock University, L2S 3A1, St. Catharines, ON, Canada aut Kahurananga R. Department of Biological Sciences, Brock University, L2S 3A1, St. Catharines, ON, Canada aut Fish Physiology and Biochemistry Kluwer Academic Publishers 15/4(1996-08-01), 339-347 0920-1742 15:4<339 1996 15 10695 https://doi.org/10.1007/BF02112361 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02112361 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Houston A. Department of Biological Sciences, Brock University, L2S 3A1, St. Catharines, ON, Canada aut NATIONALLICENCE 700 1- Dobric N. Department of Biological Sciences, Brock University, L2S 3A1, St. Catharines, ON, Canada aut NATIONALLICENCE 700 1- Kahurananga R. Department of Biological Sciences, Brock University, L2S 3A1, St. Catharines, ON, Canada aut NATIONALLICENCE 773 0- Fish Physiology and Biochemistry Kluwer Academic Publishers 15/4(1996-08-01), 339-347 0920-1742 15:4<339 1996 15 10695 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer