A school of California (northern) anchovies. (Image by Brian Gratwicke via Flickr)

Evidence of first vertebrate with polarized vision

Most invertebrates can detect polarization of light in addition to color and intensity, which helps with target detection, orientation and communication. But a recent study found evidence of the first vertebrate that possesses polarization vision: the northern anchovy. Optic nerve recordings from anchovies have shown that the fish’s eyes show retinal segregation for independent colour […]

A single hatchery pond of juvenile steelhead trout undergoing an IHNV epidemic.
(Credit: Dworshak National Fish Hachery, Orofino, Idaho.)

How a deadly virus spreads among young farmed fish in the Pacific Northwest

A new study explores the spread of infectious hematopoietic necrosis virus (IHNV), which plagues Pacific salmon and trout. Researchers looked at the spread of IHNV among juvenile hatchery-raised fish in the Pacific Northwest, where rates of infection and mortality are high. Hatchery-raised salmon present a unique challenge when it comes to IHNV detection, because while hatcheries […]

Coho Salmon are native to Canada. They are fished from the wild as well as farmed in aquaculture. (Image credit: Oregon Department of Forestry)

Salmon like the dark side

Salmon living in tanks with darker backgrounds are typically less aggressive than those living in a lighter coloured environment, according to new research. The researchers divided 100 Coho Salmon into 10 different tanks, each with different colour patterns, and monitored their behaviour. They found that the salmon prefered the darker areas, and were less aggressive […]

Recovery is possible for global fisheries

The world’s declining fisheries could recover in less than a decade if management reforms are implemented in time, according to researchers. Researchers looked at 4,500 fisheries in the world, representing about 78 per cent of the reported global catch using state of the art bio-economic models. The researchers found that while the majority of fisheries […]

Overlapping fishing zones could be placing strain on oceanic sharks

Overlap in the ranges of sharks and fishing vessels is placing oceanic shark species at risk from overfishing say researchers. By monitoring the ranges of eight species of oceanic sharks by satellite, and tracking two fleets of longline fishing vessels over several years, researchers found about 80 per cent of the range of oceanic sharks […]

How much fish are we really catching? (Infographic courtesy of The Pew Charitable Trusts)

Underestimating global fisheries catches

  Researchers have been substantially underestimating the total global fisheries’ catches by as much as 50 per cent, according to a new study. The results are based on “catch-reconstruction”, using scientific literature and asking local experts to help provide missing data. The researchers found increases in catches every year from 1950 to 1996, at which […]

(Photo Credit: Ed Roberts)

Marine protected areas failing to protect history

Marine protected areas (MPAs) are failing to protect the evolutionary diversity of fish and corals, according to a new study. The researchers conclude that over 7,000 million years of the evolutionary history of corals and 3,586 million years of fish evolution is not protected. Researchers studied 450 species of fish, which represent important components of marine biodiversity, and hundreds of species of coral, and calculated how […]

Failing our fish: Most at-risk fish species less likely to be listed

The more at risk a marine fish is in Canada, the less likely it is to be listed on the Species At Risk Act according to new research. According to Susanna Fuller, co-author and Marine Program Coordinator at the Ecology Action Centre in Halifax, “less than 20% of at-risk marine fishes in Canada have been […]

The Mary Rose was a British warship under King Henry VIII. It sank in 1545 after serving for 33 years. It was salvaged in 1982, when conservation efforts began. (Image Credit: Mary Rose Trust, via Wikimedia Commons)

The British navy went far for food

Looking at old cod found in the hold of the Tudor warship the Mary Rose is  providing a glimpse of  fisheries history. A DNA analysis of the stored cod revealed it was caught in near Iceland and Newfoundland and  is “illuminating the role of naval provisioning in the early development of extensive sea fisheries, with […]

Wild male Coho salmon (picture above) reproduce better than males released from hatcheries. (Image credit: Bureau of Land Management Oregon and Washington)

Wild salmon reproduce better than hatchery ones

Hatchery salmons are often introduced into rivers to support wild populations, which are in a state of decline. Yet hatchery males have lower reproductive success than wild ones, according to a study of 196 Coho salmons (Oncorhynchus kisutch). When occupying the same position in the spawning hierarchy, hatchery males have only 55 to 84 per […]

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