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Thesis Examination: MSc Student Jamie Card

Thu. Aug. 5 01:30 PM - Thu. Aug. 5 03:30 PM
Contact: Dylan Jones
Location: Zoom

Jamie Card - MSc Student in Bioscience, Technology, and Public Policy

Thesis Exam Chair: Dr. Jeannie Kerr, Associate Professor, Faculty of Education

Title: Quantifying biological responses of catch-and-release angling in understudied fish species and practices

Abstract:

Many catch-and-release angling events involve air exposure and exhaustive exercise that elicit a physiological stress response, and depending on a variety of factors, delayed mortality is a possible outcome. There have been ample studies in this area, however, significant gaps exist in the literature for species that are targeted by more specialized anglers, such as freshwater drum (Aplodinotus grunniens). Additionally, ice-angling is a popular activity practiced across northern regions during the winter season. Despite this popularity and due to inherent issues with sampling fish in the wintertime, few studies have quantified the sublethal impacts of ice-angling and ice/air exposure on fish species that will be released back into the water. To address these knowledge gaps I completed two studies. In the first study I quantified physiological and reflex responses in freshwater drum following angling, across seasons. Please refer to this link for further details regarding this study: https://www.sciencedirect.com/science/article/pii/S0165783621000096?casa_token=Z-cO78QVdTUAAAAA:idri7d_IfyYnX8gt2FyF01b5sh6zuFEym9DwSCKRkIlcE2NqXLPgJ85H7KfDHVixzn3Guy1q.

In the second study I exposed yellow perch to an ice-angling event followed by a 3 min ice/air exposure period where I quantified surface temperature of important tissues, reflex impairment, and assessed tissues for damage due to freezing using histological methods. Results showed that reflexes were impaired following ice-angling, heat loss occurred throughout the exposure treatment in the midbody, other important tissues (eye, gills, caudal fin) remained below 0 °C throughout the exposure, and aneurysms within the secondary lamellae of the gills were found in 68.75 % of all fish (both control and treatment individuals) that were caught via ice-angling. These aneurysms may result from exposure to sub-zero temperatures that may have compromised pillar cells, although further study is warranted. It is recommended that anglers limit air exposure when ice-angling in sub-zero temperatures by keeping fish submerged in water or releasing any fish immediately that they do not intend on harvesting, to limit negative biological consequences of cold air exposure coupled with the stress of an ice-angling event.

To register as an audience member, please email Dylan Jones at d.jones@uwinnipeg.ca