Background Articles

Warming waters have driven thousands of ocean species poleward from the equator, threatening marine ecosystems and the livelihoods of people who depend on them.

Plastic pollution is threatening the wildlife in the Mekong River Basin.

Researchers observe declines in sockeye salmon diversity of the Skeena River, British Columbia. Populations that have returned to their spawning grounds for years are at risk of dying out.

William Twardek, a Carleton University PhD student who's been studying Yukon River chinook salmon, says his four-year research project has found that some fish simply can't make it past the fish ladder to reach their spawning grounds.

A meeting of the Yukon River Panel focused on a surprising discrepancy between measurements at two different sonar stations. This could mean fish are dying or being miscounted, or that harvesting is going unreported.

A new report from the Governor's Salmon Recovery Office shows salmon and steelhead populations in Washington state teetering on the brink of extinction. Five or the populations of salmon and steelhead listed a threatened or endangered, are in crisis.

January 15, 2021 - Following a summer and fall of cloudy waters in Great Slave Lake and the Hay and Slave Rivers, the Department of Environment and Natural Resources (ENR)...

Bocaccio rockfish have made a huge comeback in B.C. since being deemed endangered in 2013, but the success story is being met with some trepidation as trawler fishermen can’t seem to avoid netting them now.

Barnehage, sjukeheim, rådhus, legesenter, barneskule, vass- og avløpssystem, eit bustadfelt og ei av hovudfartsårene inn til Gjerdrum er sett ut av spel.

We examined the effects of temperature and salt concentration on growth of the freshwater oomycete Saprolegnia parasitica that has recently (since 2013) been found to infect an important subsistence fish (in Iñupiaq, Aanaakłiq; broad whitefish, Coregonus nasus) on the Colville River in Nuiqsut, Alaska. Using two confirmed isolates (one from the Colville River and another from a southern British Columbia aquaculture facility), we tested the following hypotheses: (1) the isolate from Alaska will grow at a greater rate than the isolate from British Columbia at lower temperatures, (2) the isolate from British Columbia will grow at a greater rate at higher temperatures than the Alaska isolate, and (3) increasing salinity will reduce the growth rate of both isolates similarly at all temperatures. In addition, we used local observations—subsistence fishers and observations asso- ciated with scientific monitoring—to assist in interpreting the potential implications of our experi- mental results in the context of these environmental observations. In the habitat relevant to this study, water temperature ranges between <0°C and 18°C, and salinity ranges between 0 and 30 parts per thousand due to a seasonal (and occasional west wind-driven) saltwater intrusions. No statistically significant differences were detected in growth rate or salt tolerance between the two isolates at the temperatures and salinities tested; high temperature (24°C) and low salt concentra- tion are associated with the highest growth rate for both isolates. From our lab study, one might conclude that the peak host colonization would occur during the seasonal period of warmest water temperature; however, the observations by local fishers and biologists show this not to be the case. We conclude that, at this time, we do not have evidence that peak warm water is the primary cause of an increased incidence of infection by this freshwater mold. Although indirect and lag analysis of temperature and timing of infection were not part of this study, we note that there is a greater role of complex interactions among biotic and abiotic factors (including temperature) that may predis- pose some individuals in the population to become infected during spawning season.

The appeal was sent to president Putin on 30 October on behalf of Moscow and St Petersburg surfing federations, pointing his attention to the fact that traces of rocket fuel were found in samples from the polluted area. It means that the anthropogenic version of the recent environmental catastrophe mustn’t be brushed aside, the surfers say.

People swimming at Sydney's world famous Bondi Beach had a close shave with several sharks. Drone footage showed dozens of people taking a morning dip and swimming past a large school of salmon, unaware that up to two sharks, believed to be Grey Nurses, were feeding on the fish nearby.

The event caused a die off of up to 95% of marine life along the seabed. The Russia's Academy of Sciences announced that the mass death was due to the effects of toxins from single-cell algae. Environmentalists are conducting their own inquiries and were not yet able to confirm the official probe's findings.

Environmental campaigners said they were conducting their own inquiries and were not yet able to confirm the official probe's findings.

A broad area of yellow foam is prompting some marine biologists to blame the catastrophe on a harmful algae. However, Governor Vladimir Solodov believes the most likely explanation is a spill. Tests have shown petroleum levels four times higher and phenol levels 2.5 times above normal.

Injured surfers and large number of dead sea creatures reported in Kamchatka region. Some experts have suggested highly toxic rocket fuel could have leaked into the sea. The first test site, Radygino, is about six miles (10km) from the sea.

Organizations representing Yukon River communities are drafting a letter to Gov. Mike Dunleavy seeking a fishery disaster declaration for this summer’s

When Arctic fish are too hot, they can get lethargic, slow down, and possibly turn back during their migration to seek cooler water. When the water gets really warm they can even lose their ability to stay upright.

If carbon emissions continue at current rates, so much mercury will leach from thawing permafrost that fish in the Yukon River could become dangerous to eat within a few decades.

The findings bolster reports by Alaska subsistence fishermen that the species’ numbers have been increasing as the Arctic warms at more than double the rate of the rest of the globe.

Some biologists think the trend is related to the reduced hunting pressure from Outside hunters this year.