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North Atlantic Monster Shark Tournament.

A shark is weighed in New Bedford, Massachusetts, as part of the North Atlantic Monster Shark Tournament. Recreational shark hunting accounts for a growing proportion of shark catches. Credit: Maddie Meyer/Getty

Conservation biology

Fishing for fun takes a massive bite out of marine life

Hobbyists’ harvest of sharks and rays has soared, and catch-and-release is no solution.

The volume of fish caught recreationally more than tripled in the 60 years to 2014, and a recent uptick in recreational shark hunting is damaging fragile populations.

The United Nations agency that documents fishing statistics almost exclusively monitors commercial fisheries. To quantify the impact of pleasure fishing, Dirk Zeller at the University of Western Australia in Crawley and his colleagues reconstructed the amount of fish caught annually in 125 countries. The researchers analysed reports from events such as fishing jamborees and gathered data on factors such as the number of licensed recreational fishers per state to scale up to a global estimate.

The results showed that recreational catches increased from about 280,000 tonnes in the mid-1950s to around 900,000 tonnes in 2014. The hunting of sharks and rays for fun has been rising more steeply than other forms of recreational fishing since 1990, and now accounts for up to 6% of recreational catches worldwide. Although shark hunters often release the fish, a previous study of hammerhead sharks found that the majority of fish that were hooked and released died before reaching reproductive age.

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Auroras on Jupiter

Jupiter’s aurora glows blue in this composite image. A newly detected radio signal might be the signature of a similar aurora on a planet in another solar system. Credit: NASA/ESA/J. Nichols, Univ. Leicester

Astronomy and astrophysics

Wiggly signal hints of an aurora on a planet far from the Solar System

A vast radio observatory on Earth detects signals similar to those generated by the aurora on Jupiter.
Members of the "Ice Memory project" extract an ice core piece out of a drill machine

Scientists extract an ice core from the Col du Dome glacier near the top of Mont Blanc in the French Alps. A similar core documents changes in emissions of an ozone-depleting gas. Credit: Philippe Desmazes/AFP/Getty

Atmospheric science

Ice on the Alps’s highest peak details a pollutant’s rise

A glacier on Mont Blanc provides a decades-long record of the use of bromine, which corrodes the ozone layer.
Jumping ant guarding pupae and larvae at the nest

The brain of an Indian jumping worker ant (above, guarding pupae and larvae) becomes smaller if she starts to lay eggs but can regrow to its old size if she stops reproducing. Credit: Martin Dohrn/Nature Picture Library

Neuroscience

Ants shrink their brains for motherhood — but can enlarge them when egg-laying ends

Brain volume plummets in ‘gamergate’ ants that gain the ability to reproduce, but rises again with a fall in fertility.
A health worker puts on his personal protective equipment

A health worker in the Democratic Republic of the Congo prepares to care for people infected with Ebola virus during the 2018–20 outbreak, which prompted an extensive genomic analysis. Credit: John Wessels/AFP/Getty

Genomics

An unprecedented genomic analysis helped to curb an Ebola outbreak

Despite extraordinary challenges, scientists managed to sequence a high percentage of Ebola virus genomes from a deadly wave of infections.
Ember and thick smoke from bushfires reach Braemar Bay in New South Wales

Vast bush fires that swept across Australia at the end of 2019 and the start of 2020 filled the skies with enough smoke to warm a portion of the atmosphere. Credit: Saeed Khan/AFP/Getty

Atmospheric science

Smoke from Australian fires turned up the heat in the southern sky

The catastrophic wildfires of late 2019 and early 2020 triggered a lingering temperature rise in a section of Earth’s lower atmosphere.
Visible and infrared images of the device in fully discharged and charged states

A display screen in its uncharged (top left) and charged (top right) state in visible light. The screen reflects one range of infrared wavelengths when uncharged (bottom left) and another range when charged (bottom right). Credit: M. S. Ergoktas et al./Nature Photon.

Optics and photonics

One screen, three images — some invisible in ordinary light

A graphene-based device can display several images simultaneously using a range of wavelengths.
Woman harvesting teff, Ethiopia

A farmer in Ethiopia harvests teff, a cereal. Small farms tend to have more-diverse landscapes than do sprawling industrial operations. Credit: Andia/Universal Images Group/Getty

Environmental sciences

Small farms outdo big ones on biodiversity — and crop yields

Large-scale farms account for most of the global food supply, but smallholdings protect species and are just as profitable.
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