Young parasites make their fish hosts extra careful – but once they mature they do all they can to ensure the fish are eaten by a bird to complete their life cycle

Fish pool their experience to solve problems collectively, according to new research.

Fish are sentient animals who form friendships, experience “positive emotions” and have individual personalities. That, according to the Royal Society for the Prevention of Cruelty to Animals (RSPCA), is the implication of a landmark new study which found zebrafish are social animals in a similar way to humans and other mammals.

Experiments provide direct evidence of how phenanthrene causes irregular heartbeat and weaker contractions of heart cells.Urban air pollution, laden with PAHs, has been implicated in cardiac distress. The current study points the finger at phenanthrene, which could enter the bloodstream through respiratory pathways such as breathing.The researchers also suggest that atmospheric phenanthrene deserves more attention for the possible impact it could have on the cardiovascular health of people. Better understanding of the connection between phenanthrene and human health could potentially lead to insights regarding which aspects of fossil-fuel bur

This is the future, folks.

Grass carp have been found in Lake Erie, Lake Michigan and Lake Ontario, although it’s uncertain how many there are or how widely they have spread. By John Flesher.

First ever video of an elusive new ruby seadragon filmed in wild. By Chelsea Whyte.

Healthy, convenient and increasingly popular over the past few years, sushi has become as common a cuisine in the UK as Indian or Chinese. It’s a staple lunch-choice for city-workers all over the country and you’re never far from a restaurant or supermarket selling the traditional Japanese delicacy. But it turns out sushi may not be as wholesome a choice as we previously thought – leading biologists have warned that it is in fact harming both the environment and our health.

A bluefin tuna has fetched 74.2m yen (£517,000) at the first auction of the year at Tsukiji market in Tokyo, amid warnings that decades of overfishing by Japan and other countries is taking the species to the brink of extinction. The 212kg fish, caught off the coast of Oma in northern Japan, was bought by Kiyomura, the operator of the Sushi Zanmai restaurant chain, after its president, Kiyoshi Kimura, outbid rivals for the sixth year in a row.

A new analysis of seahorse DNA could reveal how it became one of the strangest beasts in the animal kingdom. By Sarah Emerson.

Pollution can seem like a vague, general problem, but sometimes it is specific and personal. People with asthma living in some major cities know to keep tabs on the ozone report in the weather forecast, for example. And frequent anglers should be keenly aware of how much of their catch they put on the dinner table because of mercury contamination in fish. Mercury is a problem for marine fish, as well—particularly the ever-popular tuna.

Several other species of arapaimas are likely lurking in the Amazon, waiting to be identified. By Brian Clark Howard.

China’s fish problem is an underappreciated source of tension in the East and South China Seas. By Adam Bartley.

A controversial plan for a tourist attraction sparks questions about South Australia’s celebrated tuna ranching industry. By Jessica Wynne Lockhart.

If someone offered you a chance to invest millions of dollars in a business nobody wants, would you take it? If you’re the U.S. government, the answer is a resounding yes. Since 2007, the National Oceanic and Atmospheric Administration—despite major political, social, and environmental headwinds—has poured almost $100 million (PDF) into aquaculture, also known by the more pedestrian moniker of fish farming.

In West Africa, the sawfish was once a source of cultural pride and power. What happens to traditional African cultures as it disappears? By Jori Lewis. (June 14, 2016)

Vital fish stocks destined for human mouths in West Africa are being pillaged by foreign meat companies to feed pig, chicken and salmon farms on the other side of the world, an investigation for The Independent has found. Soaring global demand for meat is forcing producers to scour new frontiers in the search to produce animal feed ingredients for their factory farms, with omega 3-rich fish, such as sardines from Senegalese waters, increasingly on their target list.

Inside the weirdly deep, surprisingly fraught field of fish pain.

Ban on all fishing, rafting and other river activities in the US river will remain until fish stop dying, say officials.

If you've ever dumped a pet goldfish in a nearby body of water and thought your act was harmless, think again.