Physiological Responses of Free-Swimming Adult Coho Salmon to Simulated Predator and Fisheries Encounters
You are here
Donaldson, MR and Clark, TD and Hinch, SG and Cooke, SJ and Patterson, DA and Gale, MK and Frappell, PB and Farrell, AP, Physiological Responses of Free-Swimming Adult Coho Salmon to Simulated Predator and Fisheries Encounters, Physiological and Biochemical Zoology, 83, (6) pp. 973-983. ISSN 1522-2152 (2010) [Refereed Article]
The responses of free-swimming adult coho salmon (Oncorhynchus kisutch) to simulated predator and fisheries encounters were assessed by monitoring heart rate (f H) with implanted data loggers and periodically taking caudal blood samples. A 10-or 30-min corralling treatment was conducted to simulate conspecifics being cornered by a predator or corralled by fisheries gear without physical contact. Corralling rapidly doubled fH from ∼31 beats min -1 to a maximum of ∼60 beats min -1, regardless of the duration of the corralling. However, recovery of f H to precorralling levels was significantly faster after the 10-min corralling (7.6 h) than after the 30-min corralling (11.5 h). An exhaustive-exercise treatment (chasing for 3 min, with physical contact) to simulate a predator chasing a fish to exhaustion exhaustion or a fish becoming exhausted after encountering fisheries gear resulted in increased fH (to 60 beats min -1), plasma lactate, glucose, sodium, osmolality, and cortisol (males only) and a significant decrease in mean corpuscular hemoglobin concentration. Recovery of fH and most blood variables was complete about 16 h after exhaustive exercise and handling. The results illustrate a clear relationship between the intensity of exercise and the duration required for recovery of f H. Changes in f H were significantly correlated with those in plasma lactate, chloride, and sodium at 1 h after the exercise treatment protocols. Thus, measurements of f H may provide an accurate indication of the general physiological response of salmonids to exhaustive exercise in the natural environment. © 2010 by The University of Chicago.
Repository Staff Only:
item control page