When tunas dive down to cold depths their body temperature stays warm but their heart temperature can fall by 15 degrees within minutes. The heart is chilled because it receives blood directly from the gills which mirrors water temperature. This clearly imposes stress upon the heart but it keeps beating, despite the temperature change. In most other animals the heart would stop.
A recent stranding of a basking shark (Cetorhinus maximus) in north-western Bali is the first confirmed record of this large, filter-feeding shark species in Indonesian waters. The shark was an adult male. It is possible that the Indonesian throughflow – the warm ocean current which moves water from the Pacific to the Indian Ocean – is […]
Green sea turtles may stop basking on beaches around the world within a century due to rising sea temperatures, a new study suggests. Naturalists as early as Darwin observed beach basking in green turtles (Chelonia mydas). It helps the threatened animals regulate their body temperatures and may help their digestion and immune systems. After analysing […]
Mother turtles find their way back to nesting beaches by looking for unique magnetic signatures along the coast, according to a new study published in Current Biology. Loggerhead turtles, for example, leave the beach where they were born as hatchlings and traverse entire ocean basins before returning to nest, at regular intervals, on the same stretch of […]
SCUBA Travel have released their annual list of the best-selling diving books and DVDs of the year. For fourteen years SCUBA Travel have published the top ten list, and its contents remain remarkably constant. Coral Reef Fishes: Indo-Pacific and Caribbean by Lieske and Myers has, in its various editions, been continually in the list since […]
Humpback whales work together whilst foraging on the bottom for food – but how do they co-ordinate their behaviour? The answer might be a “tick-tock” song.
The 1974 film “Jaws” immortalized the Great White but also did more damage to the image of the Great White Shark than they could ever do themselves. Despite all the fear and celebrity, very little is known about these aquatic behemoths. Scientists who have studied Carcharodon carcharias (jagged tooth) aren’t even sure how they reproduce. […]
In the last 60 years the fishing industry have caught nine out of every ten large fish. That’s only 10% of large fish like tuna, cod, swordfish and halibut remaining on the planet. International fleets still pursue what is remaining. According a 2014 report by the United Nations Food and Agriculture Organization, over 90% of […]
Australia has declared that it will ban dumping of sediment in the marine park area of the Great Barrier Reef, but not in the entire World Heritage Site. This matters because, according to environmental pressure group Fight for the Reef, in recent years 80% of dumping has been in World Heritage waters just outside the […]
Male crustaceans avoid being completely feminised by pollutant-contaminated seawater as they “lock down” their maleness. New research by scientists at the University of Portsmouth has shown that crustaceans turned partially into females but retained a core of masculinity, and they may have learned how to do it after evolutionary battles with parasites. The research is […]