Blood oxygen transport, rheology and haematological responses to confinement stress in diploid and triploid Atlantic salmon, Salmo salar

Diploid and triploid all-female Atlantic salmon (Salmo salar) smolts were c hallenged with 2.5 h of confinement stress in aerated seawater. Subsequent stress responses were quantified by plasma cortisol, glucose, and lactate, and by the haematological parameters haematocrit (Hct), red blood cell coun t (RBCC), mean cell volume (MCV), blood haemoglobin concentration (Hb), mea n cell haemoglobin (MCH), mean cell haemoglobin concentration (MCHC), total protein and erythrocyte adenosine triphosphate (ATP). The magnitude of str ess responses was similar between diploid and triploid smolts. Triploid smo lts displayed a higher MCH, but lower Hb than diploid smolts. The blood oxy gen affinity of diploid and triploid fish was similar at 15 degrees C over the pH range 6.76-7.99 and the isohaemoglobin components were identical. Th e enlarged triploid erythrocytes showed reduced shear-dependence on blood v iscosity at constant Hct and are therefore unlikely to contribute to greate r peripheral vascular resistance. The results show that despite having fewe r, larger erythrocytes, triploids have very similar oxygen carrying capacit y and haematological response to stress as diploids. This suggests that the higher farm mortality reported for triploids in response to stress is not generated by their failure to show respiratory homeostasis in the face of s tress. (C) 2000 Elsevier Science B.V. All rights reserved.