Date of Award

2016

Degree Type

Thesis

Degree Name

M.Sc.

Department

Great Lakes Institute for Environmental Research

First Advisor

Drouillard, Ken

Second Advisor

Johnson, Tim

Keywords

PCB; round goby; tolerance; tubenose goby

Rights

CC BY-NC-ND 4.0

Abstract

This thesis compared physiological tolerance and bioenergetic requirements in a pair of Great Lakes invasive fish from the family Gobiidae: the round goby (Neogobius melanostomus) and the tubenose goby (Proterorhinus semilunaris). Physiological tolerance studies compared the response of the two species to acute thermal stress. The 12 h LC50 (lethal temperature contributing to 50% mortality) for round goby (33.4°C) was significantly higher than the tubenose goby (31.9oC). The LT50 (lethal time contributing to 50% mortality) for round goby was also longer compared to tubenose gobies. Routine metabolic rates of the two goby species were estimated using a depuration tracer modelling approach based on PCB elimination measured in the two species under 21.4oC. There were no significant differences in the rate of PCB elimination or estimates of RMR between round and tubenose goby. This implies that the two species have a similar bioenergetic requirements at their preferred temperature.

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