A5059824283- Fish Ecology and Management Studies
- Marine and fisheries research
- Marine animal studies overview
- Fish Biology and Ecology Studies
- Aquatic Invertebrate Ecology and Behavior
- Physiological and biochemical adaptations
- Marine Bivalve and Aquaculture Studies
- Hydrology and Watershed Management Studies
- Isotope Analysis in Ecology
- Hydrology and Sediment Transport Processes
- Underwater Acoustics Research
- Marine and coastal ecosystems
- Reproductive biology and impacts on aquatic species
- Aquaculture disease management and microbiota
- Water Quality and Resources Studies
- Avian ecology and behavior
- Oceanographic and Atmospheric Processes
- Aquaculture Nutrition and Growth
- Marine and coastal plant biology
- Environmental DNA in Biodiversity Studies
- Water resources management and optimization
- Hydrological Forecasting Using AI
- Water Quality Monitoring Technologies
- Ichthyology and Marine Biology
- Soil and Water Nutrient Dynamics
Kintama (Canada)
2013-2024
Fisheries and Oceans Canada
2002-2017
Elon University
2014
University of British Columbia
2008-2009
Vancouver Aquarium
2009
University of Tasmania
2009
University of Victoria
2009
NOAA National Marine Fisheries Service Northwest Fisheries Science Center
2009
NOAA National Marine Fisheries Service
2009
Simon Fraser University
2008
Since 1996, some populations of Fraser River sockeye salmon ( Oncorhynchus nerka Walbaum in Artedi, 1792) have begun spawning migrations weeks earlier than normal, and most perish en route as a result. We suspect that high midsummer river temperature is the principal cause mortality. intercepted 100 during normal migration near stream measured somatic energy aspects plasma biochemistry. Fish were then held at either 10 or 18 °C for 24 days. Before release, fish biopsied again implanted with...
We present the first data to link physiological responses and pathogen presence with subsequent fate during migration of wild salmonid smolts. tagged non-lethally sampled gill tissue from sockeye salmon (Oncorhynchus nerka) smolts as they left their nursery lake (Chilko Lake, BC, Canada) compare gene expression profiles freshwater loads success over ~1150 km North Pacific Ocean using acoustic telemetry. Fifteen per cent were never detected again after release, these fish had consistent an...
Ocean surveys show that extremely sharp thermal boundaries have limited the distribution of sockeye salmon (Oncorhynchus nerka) in Pacific and adjacent seas over past 40 years. These limits are expressed as a step function, with temperature defining position limit varying between months an annual cycle. The sharpness edge, different temperatures define edge year, subtle variations area or decade for given month probably all occur because temperature-dependent metabolic rates exceed energy...
Abstract Fish migration represents one of the most complex and intriguing biological phenomena in animal kingdom. How do fish migrate such vast distances? What are costs benefits migration? Some these fundamental questions have been addressed through use telemetry. However, telemetry alone has not will yield a complete understanding biology or provide solutions to problems as identifying physical barriers potential impacts climate change. Telemetry can be coupled with other tools techniques...
Freshwater and early marine migration survival of endangered Cultus Lake sockeye ( Oncorhynchus nerka ) salmon were studied using the Pacific Ocean Shelf Tracking (POST) array. Smolts acoustically tagged in 2004–2007, their was recorded within lower Fraser River coastal southern British Columbia waters. Most smolts showed rapid directional movement (swimming speeds ~15–30 km·day –1 ). Average exit time from 4.0–5.6 days after release, average residence Strait Georgia 25.6–34.1 days....
Many salmon populations in both the Pacific and Atlantic Oceans have experienced sharply decreasing returns high ocean mortality past two decades, with some facing extirpation if current marine survival trends continue. Our inability to monitor movements of fish or directly measure their precludes experimental tests theories concerning factors regulating populations, thus limits scientific advance many aspects fisheries management conservation. Here we report a large-scale synthesis movement...
Abstract The effects of ocean conditions on highly migratory species such as salmon are difficult to assess owing the diversity environments they encounter during their marine life. In this study, we reconstructed initial migration routes juvenile Chinook Oncorhynchus tshawytscha originating from Oregon Southeast Alaska using coded wire tag recovery data Canadian Department Fisheries and Oceans National Marine Service research surveys conducted between 1995 2006. Over 12‐year period, 1,862...
The mortality of salmon smolts during their migration out freshwater and into the ocean has been difficult to measure. In Columbia River, which an extensive network hydroelectric dams, decline in abundance adult returning from since late 1970s ascribed large measure presence although completion hydropower system occurred at same time as large-scale shifts climate, measured by climate indices such Pacific Decadal Oscillation. We survival sea using elements acoustic telemetry system, Ocean...
Abstract Few estimates of migration rates or descriptions behavior survival exist for wild populations out‐migrating Pacific salmon smolts from natal freshwater rearing areas to the ocean. Using acoustic transmitters and fixed receiver arrays across four years (2010–2013), we tracked >1850 sockeye ( Oncorhynchus nerka ) Chilko Lake, British Columbia, coastal Ocean (>1000 km distance). Cumulative ocean ranged 3–10% among years, although this may be slightly underestimated due technical...
Archival tags record information about the environment of tagged animals over long periods time (months to years). In theory, position can be estimated from a changes in light intensity with time. We describe two approaches estimating geoposition based on either maximal rate change or that reference is reached. Digital signal processing investigated as method increasing signal-to-noise ratio record. Our test data suggest daily animal potentially within an average error 140 km (SD's 0.9°...
Abstract Bioenergetic models frequently rely on published values or for estimating the energy density of fish, principally because cost and effort obtaining direct measurements. In this study, we developed empirical free-ranging juvenile coho salmon Oncorhynchus kisutch Chinook O. tshawytscha sampled at sea from west coast Oregon to Kodiak Island, Alaska, evaluated accuracy commonly used these species. Our analyses showed that was strongly correlated percent dry weight proximate constituents...
The diet of chum salmon (Oncorhynchus keta) can range from a primarily arthropod to gelatinous composition. Because no data exist for the digestion rates prey in any fish, it has not been possible convert on stomach contents feeding rates. We measured address this issue. In freely age-0 salmon, ctenophore Pleurobrachia bachei was digested almost completely within 1 h, whereas 70% shrimp sections similar mass remained after 5 h at 13°C. To examine fast progress smaller intervals, and age-1...
Abstract Knowledge of the migratory habits juvenile Pacific salmon Oncorhynchus spp. is required to test hypothesis that ocean food resources are a limiting factor in their production. Using DNA stock identification techniques, we reconstructed regional and seasonal changes composition sockeye O. nerka ( n = 4,062) collected from coastal Washington Alaska Peninsula trawl surveys May February 1996–2007. Individuals were allocated 14 populations. The majority stocks Fraser River system (42%),...
Two populations of homing sockeye salmon (Oncorhynchus nerka; Adams and Chilko) were intercepted in the marine approaches around northern southern ends Vancouver Island (British Columbia, Canada) en route to a natal river. More than 500 nonlethally biopsied for blood plasma, gill filament tips, gross somatic energy (GSE) released with either acoustic or radio transmitters. At time capture, GSE, body length, circulating testosterone ([T]) differed between populations, differences that...
Abstract An understanding of the distribution North American green sturgeon Acipenser medirostris in coastal waters is crucial to minimize impacts on this vulnerable species from various fisheries. To determine migratory patterns, we tagged 213 subadult and adult spawning rivers summer aggregation areas with uniquely coded ultrasonic pingers observed their movements arrays automated hydrophones deployed along West Coast America southeast Alaska Monterey Bay, California. Green exhibited an...
Multiple dam passage during seaward migration is thought to reduce the subsequent survival of Snake River Chinook salmon. This hypothesis developed because juvenile salmon from River, Columbia River’s largest tributary, migrate >700 km through eight hydropower dams and have lower adult return rates than downstream populations that only 3 or 4 dams. Using a large-scale telemetry array, we tested whether hatchery-reared spring reduced in estuary coastal ocean relative downstream, population...
Abstract We collated smolt‐to‐adult return rate (SAR) data for Chinook salmon from all available regions of the Pacific coast North America to examine large‐scale patterns survival. For consistency, our analyses primarily used coded wire tag‐based (CWT) SAR estimates. Survival collapsed over past half century by roughly a factor three ca. 1% many regions. Within Columbia River, SARs Snake River populations, often singled out as exemplars poor survival, are unexceptional and in fact higher...
Pacific salmon are normally thought to be distributed throughout the Subarctic Pacific, an area where they form dominant fish fauna. We use a series of generalized additive models show that exhibit sharp step-function response temperature in oceanic eastern north spring. The critical defining southern boundary varied by species: 10.4 °C for pink and chum salmon, 9.4 coho 8.9 sockeye salmon. These thermal limits occur well Transition Zone, at widely separated geographic positions within...
ABSTRACT Analysis of δ 13 C and 15 N isotope values for five species Pacific salmon indicate that they form a trophic hierarchy on the high seas. On basis an analysis these stable ratios, chinook feed at upper end food chain pink lower end, in sequence → sockeye coho chinook, with separated by ca. 0.8 level. Chum occupy peculiar position, low values, possibly reflecting unusual diet includes large amounts gelatinous zooplankton (salps, ctenophoi;s, medusae). appear to unique level nearly as...