Oxygen consumption in the fathead minnow (Pimephales promelas rafinesque)--II effects of pH, osmotic pressure, and light level

1. 1. There is a curvilinear relationship between oxygen consumption (OC in cm3/g1.053 per hr) and pH, yielding the equation: OC = -0.0612(pH)2 + 1.0478(pH) - 4.051.2. 2. The relationship between OC and osmotic pressure (OP in mOsm/kg) for natural water is shown by the equation: OC = 0.0091(OP)2 - 0.0436(OP) + 0.208, and that for NaCl treated water by: OC = 0.0009(OP)3 - 0.0208(OP)2 + 0.104(OP) + 0.190.3. 3. A significant relationship was exhibited between oxygen consumption and light intensity (LI in W/m2), producing the line given by: OC = 0.0026(LI) + 0.336.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/23753/1/0000726.pd

Oxygen consumption in the fathead minnow (Pimephales promelas rafinesque)-I : Effects of weight, temperature, group size, oxygen level and opercular movement rate as a function of temperature1

1. 1. A relationship is evident between oxygen consumption (OC in cm3/hr) and weight (WT in g) such that: OC = -0.580 (WT)1.0532. 2. Fathead minnows failed to exhibit immediate rate compensation as a result of acute temperature changes. Minnows showed an exponential increase in weight-specific oxygen consumption with temperature (in [deg]C), resulting in a Q10 of over three. The equation is: OC = 100.0482 (Temp.) - 1.268.3. 3. Minnows acclimated to water temperatures of 5-21[deg]C showed a steady increase in opercular movement rates (OMR) (ventilation rates) as expressed by the equation: OMR = 0.1968 (Temp.)2 + 1.064.4. 4. Grouping more than two fish per chamber resulted in an increase in oxygen consumption. The relationship of group size (GS) to oxygen consumption is: OC = 0.04059 (GS)2 - 0.2017 (GS) + 0.5353.5. 5. Oxygen consumption is a function of dissolved oxygen level. This relationship is shown by the equation: OC = 0.003049 (OL)3 - 0.06359 (OL)2 + 0.4211 (OL) - 0.4020 where OL is oxygen level. Due to high variability, it is statistically impossible to determine oxygen level ranges in which they conformed and those in which they regulated.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/23722/1/0000694.pd