Proposed Abstract Title

Examining the Physiological Phenotype of Dying Coho Salmon Exposed to Urban Stormwater Runoff.

Type of Presentation

Poster

Session Title

General Pollution Topics

Location

2016SSEC

Description

Since the 1990’s, in areas of the Salish Sea watershed with increased urbanization, high rates of adult coho salmon (Oncorhynchus kistuch) have been observed dead in streams prior to spawning. This “pre-spawning mortality” (PSM) has been linked to urban stormwater runoff. The symptoms of affected sea-run anadromous coho broods progress from lethargy and disorientation to loss of equilibrium, immobility, and eventually death as soon as 90 minutes after exposure to urban stormwater runoff. Adult freshwater captive-bred coho broods were also exposed to urban stormwater runoff to evaluate if anadromy underlies the phenotype of PSM in mature coho.

Preliminary data collected using a point-of-care blood analysis tool suggest that fatal exposures on sea-run anadromous coho broods present symptoms for metabolic acidosis and coincident loss of osmoregulation. Death appeared to be not as rapid or certain in the exposed freshwater captive coho brood, which primarily showed signs of metabolic acidosis without the disruption in osmoregulation. These observations justify additional side-by-side comparisons between freshwater captive-bred coho and anadromous broods. Additionally, these future studies are needed to establish cause of death in sea-run anadromous coho or their freshwater relatives exposed to urban stormwater runoff.

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Examining the Physiological Phenotype of Dying Coho Salmon Exposed to Urban Stormwater Runoff.

2016SSEC

Since the 1990’s, in areas of the Salish Sea watershed with increased urbanization, high rates of adult coho salmon (Oncorhynchus kistuch) have been observed dead in streams prior to spawning. This “pre-spawning mortality” (PSM) has been linked to urban stormwater runoff. The symptoms of affected sea-run anadromous coho broods progress from lethargy and disorientation to loss of equilibrium, immobility, and eventually death as soon as 90 minutes after exposure to urban stormwater runoff. Adult freshwater captive-bred coho broods were also exposed to urban stormwater runoff to evaluate if anadromy underlies the phenotype of PSM in mature coho.

Preliminary data collected using a point-of-care blood analysis tool suggest that fatal exposures on sea-run anadromous coho broods present symptoms for metabolic acidosis and coincident loss of osmoregulation. Death appeared to be not as rapid or certain in the exposed freshwater captive coho brood, which primarily showed signs of metabolic acidosis without the disruption in osmoregulation. These observations justify additional side-by-side comparisons between freshwater captive-bred coho and anadromous broods. Additionally, these future studies are needed to establish cause of death in sea-run anadromous coho or their freshwater relatives exposed to urban stormwater runoff.