EDMONTON – The discovery of dinner plate-sized goldfish and the ongoing threat of a zebra mussel infestation has the Alberta government ramping up awareness of invasive aquatic species in provincial water bodies.
The zebra mussel, which multiplies prodigiously and can clog water pipes, has been the “poster child” for invasive aquatic species. But seemingly mundane creatures can cause problems, too.
BOISE, Idaho (AP) — Federal scientists using new technologies have mapped what is being called a Cold Water Climate Shield, an area spanning five western states that could support viable populations of native species if the region continues its warming trend.Mapping the cold-water refuges for cutthroat trout, a favored sport fish among anglers, and threatened bull trout could help resource managers make decisions aimed at preserving populations of those and other cold-water native species in Idaho, Oregon, Washington, Montana and Wyoming.
LOS ANGELES — A 4.2-metre-oarfish that washed ashore in Southern California last week was carrying hundreds of thousands of eggs nearly ready to be released.
The serpent-like fish — one of two discovered along the coast last week — was dissected Monday and marine biologists found that the healthy female had 1.8-metre-long ovaries and was ripe to spawn, H.J. Walker of the Scripps Institution of Oceanography said Tuesday.
ANCHORAGE, Alaska — A veterinary pathologist worked Monday to determine what killed a juvenile fin whale discovered on the bow of a cruise ship entering an Alaska port.
The cause of death was not immediately apparent for the endangered whale spotted just after 5 a.m. Sunday on the bulbous bow of the Zaandam, a Holland America Line cruise ship, as it prepared to dock in Seward.
The carcass was towed to a beach near Seward, a spokeswoman for the fisheries section of the National Oceanic and Atmospheric Administration, Julie Speegle, said Monday.
It wasn’t a tsunami but it had the same effect: A huge cluster of jellyfish forced one of the world’s largest nuclear reactors to shut down — a phenomenon that marine biologists say could become more common.
Operators of the Oskarshamn nuclear plant in southeastern Sweden had to scramble reactor number three on Sunday after tons of jellyfish clogged the pipes that bring in cool water to the plant’s turbines.
Drugs to treat anxiety in people may alter the behaviour of fish when the chemicals are flushed into rivers, according to scientists. Swedish researchers found that European perch exposed to tiny concentrations of a drug became less sociable, ate more and became more adventurous – all changes in behaviour that could have unexpected ecological impacts on fish populations.