Loch’s chromodoris (Chromodoris lochi) is a commonly known nudibranch. Its gills are retractable, useful for keeping them safe from predators. It lives in the balmy waters of the Indo-Pacific, and grows to be 4cm.
Hey hey fluke! My friend is interested in watching documentaries about coral reefs, especially the GBF. Do you have any suggestions or ideas? Thanks!
Other than Blue Planet’s reef centric episode(watch that whole series tbh), I haven’t actually watched many reef specific documentaries, but I can link some full length ones from youtube that are pretty recent for your friend to check out!
National Geographic – Australia’s Great Barrier Reef Marine Life
The Great Barrier Reef – Nature Documentary
Treasures of the Great Barrier Reef
If your friend has any questions about things that get mentioned in the documentaries feel free to drop an ask and I’ll get around to it when I can, but here’s over 4 hours of Great Barrier Reef goodness for your buddy!
I came across this resource while doing an online course in tropical coastal ecosystems and it’s actually pretty thorough and useful so I’d just like to share it with you guys.
Every year like clockwork, sharks make reservations at the White Shark Café, a mysterious spot halfway between Mexico and Hawaii—no one knows why! But for the first time ever, a team of humans is tagging along. Stay tuned to see what our researchers and their partners learn on the White Shark Voyage with Schmidt Ocean Institute.
This is so cool!!! Can’t wait to hear more about what we discover at the Café!
Sharks have a secret weapon in their snouts that helps them hunt prey. It’s an organ that can sense faint electrical signals given off by other, delicious creatures. Now, engineers in Indiana have made a new material for electronics that mimics the shark’s sensor. It even works in salt water, which is usually a harsh environment for electronics. (Drop your smartphone in the ocean, for instance, and that’s the end of the phone.)
The new device may be useful in ways from studying marine life to building new tools for submarines. It’s made from a substance called samarium nickelate, or SNO. And it can detect some of the weakest electric fields found in the sea.
BOTTOM TRAWLING IS DESTROYING DEEP-SEA FISH POPULATION
A new study using reconstructed catch data reveals that in the past 60+ years, the practice of towing giant fishing nets along the sea floor has caused the extraction of 25 million tonnes of fish that live 400 metres or more below sea level leading to the collapse of many of those fish populations.
The study is published in Frontiers in Marine Science.
Deep-sea fish species are targeted globally by bottom trawling. The fish species captured are often characterized by longevity, low fecundity and slow growth making them vulnerable to overfishing. Also, bottom trawling is known to remove vast amounts of non-target species, including habitat forming deep-sea corals and sponges.
Researchers examined the state of 72 deep-sea fish species caught by bottom trawlers around the world, many of which were exploited to unsustainable levels.
The fisheries were found to be overall under-reported by as much as 42%, leading to the removal of an estimated 25 million tons of deep-sea fish. Besides depleting deep-sea fish stocks, bottom trawling of deep fish does not generate much in the way of marketable fish. Immature individuals are thrown overboard because they generally don’t meet minimum size requirements, while non-targeted species caught as bycatch are also returned dead to the sea.
- Photo: Big-fined chimaera by EVNautilus YT
- Reference: Victorero et al., 2018. Out of Sight, But Within Reach: A Global History of Bottom-Trawled Deep-Sea Fisheries From >400 m Depth.
Frontiers in Marine Science.
Some seals still eat like landlubbers.
Just like lions, tigers and bears, certain kinds of seals have claws that help the animals grasp prey and tear it apart. X-rays show that the bones in these seals’ forelimbs look like those found in the earliest seals, a new study finds.
Ancestors of these ancient seals transitioned from land to sea at some point, preserving clawed limbs useful for hunting on land. But clawed paws in these northern “true seals,” which include harbor and harp seals, seem to be more than just a holdover from ancient times, says David Hocking, a marine zoologist at Monash University in Melbourne, Australia. Instead, retaining the claws probably helps northern true seals catch a larger meal than they could with the stiff, slippery fins of other pinnipeds such as sea lions and fur seals, Hocking and his colleagues report April 18 in Royal Society Open Science.
DEEP-SEA MINING COULD DESTROY MARINE ECOSYSTEMS
Despite deep-sea environments covers about half of the Earth’s surface and is home to a vast range of species, little is known about these environments, and mining could have long-lasting and unforeseen consequences, not just at mining sites but also across much larger areas.
According to a study published in scientific journal Frontiers in Marine Science, which is the first to give a global overview of all current plans to mine the seabed, in both national and international waters, and looks at the potential impacts including physical destruction of seabed habitats, creation of large underwater plumes of sediment and the effects of chemical, noise and light pollution arising from mining operations.
Rising demand for minerals and metals, including for use in the technology sector, has led to a resurgence of interest in exploration of mineral resources located on the seabed. Such resources, whether seafloor massive sulfides around hydrothermal vents, cobalt-rich crusts on the flanks of seamounts or fields of manganese nodules on the abyssal plains, cannot be considered in isolation of the distinctive, in some cases unique, assemblages of marine species associated with the same habitats and structures.
Some operations are already taking place, generally at relatively shallow depths near national coastlines. The first commercial enterprise, expected to target mineral-rich sulfides in deeper waters, at depths between 1,500 and 2,000 m on the continental shelf of Papua New Guinea, is scheduled to begin early in 2019.
- Illustration: A schematic showing the potential impacts of deep-sea mining on marine ecosystems. Schematic not to scale.
- Reference: Miller et al., 2018.
An Overview of Seabed Mining Including the Current State of Development, Environmental Impacts, and Knowledge Gaps. Frontiers in Marine Science.