Sentences with phrase «of juvenile salmon»

The drought of 2001 stranded hundreds of thousands of juvenile salmon due to low flows in the Columbia River and kept them from traveling to the Pacific Ocean.

«We have shown that the proposed development area supports particularly high abundances of juvenile salmon from more than 40 populations that are harvested in at least 10 First Nations territories throughout the Skeena watershed and beyond.

Using tags surgically implanted into thousands of juvenile salmon, UBC researchers have discovered that many fish die within the first few days of migration from their birthplace to the ocean.

Not exact matches

And then get loose to infect wild juveniles, threatening the very survival of wild salmon populations.

Fishing for the right size During the summer of 2013, about 700 juvenile salmon implanted with the injectable tag were released in the Snake River in Washington state.

By exploiting natural variations in isotopes of strontiuma constituent of the underlying bedrockamong different watersheds, the scientists were able to deduce where adult salmon spent their juvenile years.

This image shows transient embryonic exposures to crude oil cause lasting reductions in the swimming speed of salmon and herring, months after additional juvenile growth in clean seawater.

Because juvenile salmon, or smolt, leave their freshwater spawning grounds to spend an average of two to three years maturing at sea, the boom in 2001 was right on schedule.

The authors estimate using findings in zooplankton that juvenile salmon in the Strait of Georgia may be ingesting two to seven microplastic particles per day, and returning adult salmon are ingesting up to 91 particles per day.

As part of his decision, Redden required dam operators to continue the practice of spilling water through the dams, though not through the power - generating turbines, to help juvenile salmon upriver bypass the dams and make it out to sea.

The paper's lead author Nelson says:» «We found an indirect link between spawning pink and chum salmon, and juveniles of another species, coho.»

Newly published research co-authored by scientists at Simon Fraser University and the Raincoast Conservation Foundation shows juvenile coho salmon benefit from dining on the distant remains of their spawning pink and chum cousins.

The sea lice spread to migrating juvenile wild salmon, resulting in the highest numbers of sea lice observed on wild salmon in a decade.

Based on the numbers of lice on juvenile salmon in 2015, researchers predicted an additional 9 — 39 per cent decline in returning pink salmon due to the outbreak.

«If they can't find the lanternfish they ate in the Sea of Cortez, they may look at juvenile salmon, as well as herring, sardines and other species that salmon may eat.

«Furthermore, during the juvenile wild salmon migration, farms are supposed to treat for sea lice within 15 days of when a threshold number of lice are found on adult farmed salmon,» says Peacock.

«These results are consistent with the idea that juvenile salmon imprint on (i.e. learn and remember) the magnetic signature of their home river, and then seek that same magnetic signature during their spawning migration,» said Nathan Putman, a post-doctoral researcher at Oregon State University and the lead author of the study.

Scientists at WSU and the National Oceanic and Atmospheric Administration Fisheries Service analyzed combinations of various pesticides to learn how they would affect juvenile salmon.

Using this version of the device, which has been dubbed the first - generation Sensor Fish, PNNL researchers measured the various forces juvenile salmon experience as they pass through dams.

Though the appearance was fish - like, the design didn't fully capture the experience of real juvenile salmon swimming through dams.

This design was later replaced with by a hollow tube stuffed with electronics to better capture the experience of real juvenile salmon swimming through dams.

On an adult fish this may be only a nuisance, but for small juvenile salmon (around the size of a finger), sea lice can be fatal.

It has now been established that sea lice from farms kill up to 95 % of juvenile wild salmon that migrate past them.

Biological monitors count juvenile coho salmon and steelhead trout that may be lurking in the existing portion of Redwood Creek.

«-LSB-...] The nearly 100 % incidence of [meningitis from Carnobacterium maltaromaticum in 18 juvenile salmon sharks stranded along the northern California and Oregon coasts between 2002 and 2007)-RSB- could have also caused «disorientation and confusion, which might lead the sharks to strand inadvertently.»

Each year, billions of captive - bred juvenile salmon are released into rivers in North America, Asia and Europe to give a bump wild populations, but their survival is 10 to 20 times lower than that of wild salmon, notes the study.

Juvenile salmon with acoustic tags tend to have lower survival rates than juvenile salmon with other types Juvenile salmon with acoustic tags tend to have lower survival rates than juvenile salmon with other types juvenile salmon with other types of tags.

It requires BOR to hold some water in reserve in the Klamath River system, to flush into the river in case of a disease outbreak among juvenile salmon.

Distribution, migration pathways, and size of Western Alaska juvenile salmon along the eastern Bering Sea shelf

For example, reductions in seasonal sea ice cover and higher surface temperatures may open up new habitat in polar regions for some important fish species, such as cod, herring, and pollock.128 However, continued presence of cold bottom - water temperatures on the Alaskan continental shelf could limit northward migration into the northern Bering Sea and Chukchi Sea off northwestern Alaska.129, 130 In addition, warming may cause reductions in the abundance of some species, such as pollock, in their current ranges in the Bering Sea131and reduce the health of juvenile sockeye salmon, potentially resulting in decreased overwinter survival.132 If ocean warming continues, it is unlikely that current fishing pressure on pollock can be sustained.133 Higher temperatures are also likely to increase the frequency of early Chinook salmon migrations, making management of the fishery by multiple user groups more challenging.134

Armstrong, J. L., J. L. Boldt, A. D. Cross, J. H. Moss, N. D. Davis, K. W. Myers, R. V. Walker, D. A. Beauchamp, and L. J. Haldorson, 2005: Distribution, size, and interannual, seasonal and diel food habits of northern Gulf of Alaska juvenile pink salmon, Oncorhynchus gorbuscha.

In 2014, about 95 percent of the juvenile winter - run Chinook salmon died because drought conditions made the Sacramento River too warm to sustain them.