Northern squawfish Ptychochelius oregonensis, O2 consumption rate: Effects of temperature and body size
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Abstract
Northern squawfish, Ptychocheilus oregonensis (live weight range 0.361–1.973 kg), O2consumption was measured with temperature-controlled, flow-through respirometers for >24 h. Mean standard O2 consumption rate of northern squawfish increased with acclimation temperature: 24.3, 49.1, 75.0, and 89.4 mg∙kg−0.67∙h−1 at 9, 15, 18, and 21 °C, respectively. Q10analysis showed that O2 consumption rate temperature sensitivity was greatest at the intermediate acclimation temperatures (15–18 °C, Q10 = 4.10), moderate at the lower acclimation temperatures (9–15 °C, Q10 = 3.23), and lowest at the higher acclimation temperatures (18–21 °C, Q10 = 1.80). Overall Q10 was 2.96 (9–21 °C). Body size (W, grams) and temperature (T, degrees Celcius) were related to O2 consumption (
, grams per gram per day) by 
W−0.285∙e0.105T. Northern squawfish red to white muscle ratios significantly exceeded those of rainbow trout, Oncorhynchus mykiss, in cross sections at 50 and 75% of standard length. High metabolic rates and red to white muscle ratios argue for comparability of northern squawfish with active predators such as sympatric rainbow trout.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Northern squawfish Ptychochelius oregonensis, O2 consumption rate: Effects of temperature and body size |
| Series title | Canadian Journal of Fisheries and Aquatic Sciences |
| DOI | 10.1139/f94-002 |
| Volume | 51 |
| Issue | 1 |
| Year Published | 1994 |
| Language | English |
| Publisher | NRC Research Press |
| Contributing office(s) | Western Fisheries Research Center |
| Description | 5 p. |
| First page | 8 |
| Last page | 12 |