Northern squawfish Ptychochelius oregonensis, O2 consumption rate: Effects of temperature and body size

Canadian Journal of Fisheries and Aquatic Sciences
By: , and 

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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−0.285e0.105T. 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.

Additional publication details

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