They are found in temperate and tropical oceans worldwide at depths between 500 to 5,000m. It is naturally well-camouflaged with a dark black/brown colouration and has a distinctive armoured head. Giant isopods are important scavengers in the deep-sea benthic environment. They are mostly carnivorous and feed on carcasses of whales, fish, and squid; they may also prey on slow-moving animals and are known to attack trawl catches. These giant shrimp are common in the deep North Atlantic waters, particularly the Porcupine Abyssal Plain.

• And we’re finding new things all the time – from nearly 20,000 previously unknown mountains, to an “impossible” fish living at a record-breaking depth of 8,336 meters.
• Carbon in phytoplankton is incorporated in marine sediments as the organisms die and sink to the seabed, and then, over millennia, the carbon becomes stored in rocks.
• A range of human activities and climate change are putting species and ecosystems at risk before we fully understand, or even discover, them.
• Such rich communities were not only found close to hydrothermal vents but also in oxygen-free zones of methane collection, cold vents and old whale skeletons.
• Depending on the specific research goals, the AUVs can operate at various depths and be fitted with a broad range of instruments.

Deep sea

It has a more compressed body and an angled jaw, is mostly black, but does not have a disk on its belly. Scientists aren’t sure yet how common these species are, but so far it appears that the bumpy snailfish may be the rarest. This particular encounter with the bumpy snailfish is the only confirmed observation of the species, the researchers said. The intention is to continue searching for more to understand these species’ geographic distribution. Although features vary among the 400 known species, they’re typically small, tadpole-shaped, and sport large, jelly-like heads. A disk on their belly allows them to either stick to the seafloor or “hitchhike on larger animals,” according to the Monterey Bay Aquarium Research Institute (MBARI).

Cataloging life in the depths

This means the “deep” is the part of our ocean that is dark, cold, food-poor, subject to intense pressure, and typically deeper than 200 meters. Carbon is stored in rocks, the atmosphere, soils and plants – and the ocean. Carbon in phytoplankton is incorporated in marine sediments as the organisms die and sink to the seabed, and then, over millennia, the carbon becomes stored in rocks. The abyssal plains of the seabed are the flattest places on earth – because they are vast accumulations of carbon-rich sediment, sometimes over 5km thick, covering the rock below. Ocean sediments cover 70% of the planet’s surface, forming the substrate for the largest ecosystem on Earth and its largest carbon reservoir (Dutkiewicz et al., 2015). The fishing at the far away deep sea locations is often the only way for fishermen from different waters to make back the money they had to invest in the boats and their equipment.

Finding the New Snailfish

• They range from shallow environments to the deep sea and apparently hold the record for the deepest-dwelling fish.
• Sometimes, scientists discover more humble creatures that are so tiny that they go unnoticed until new technology brings them into view.
• The very deepest depth of the ocean is roughly 2,000 meters deeper than Mount Everest is tall—36,070 feet deep (10,994 m)!
• It stretches from the sparsely illuminated sublithoral zone to the middle of the continental slope.
• As a result, the amount of food drifting down from the surface to the deep has declined over the past 20 years.
• Less than five percent of food produced at the surface will make its way to the abyssal plain.
• As a result, scientists working in the deep sea constantly encounter new species and other surprises.

Especially with regards to the examination of possible effects of global warming on the deep sea ecosystem. Vast datasets regarding the deep sea are rare, making it even more vital to keep these regions protected from anthropogenic influences. The Porcupine Seabight, a wide and deep inlet in the south-western Irish shelf-region (51° N, 13° W, in depths of up to 3,000 m). Here the input of larger quantities of phyto-detritus from spring blooms in the deep sea was examined for the first time. On the 20th of June 2002 the government of the republic of the Azores declared both the ‘Luck Strike’ and ‘Menez Gwen’ fields as marine protected areas (MPAs).
Submarines had been used in the past, however in 1930 the two Americans William Beebe and Otis Barton were the first to see the deep sea with their own eyes. Enclosed in a cold steel ball (the bathysphere) they were lowered to 427,8 m by a rope – deeper than anyone had previously been. Deep Sea “Shrimp and jellyfish drifted past us like flakes of unknown snowstorms” is how Beebe described the first impressions of the deep sea.

MBARI researchers discover remarkable new swimming sea slug in the deep sea

The richest manganese nodule fields are around the North-eastern Pacific along the equator, in the Peruvian basin (South-eastern Pacific) and the Indian Ocean. They are precipitation products (with an approximate size of 1 to 20 cm), which have formed around a nucleus in a concentric form and contain different metals. The fisheye, or echolocation, provides a crisp 3D image of the potential prey in the dark depths. On the seafloor they unfold with a more than 110 m high and 170 m wide opening – enough room for a dozen jumbo jets. As the fishing grounds are located close to the sea floor around the sea mounts, so-called ‘rock hopping’ devices are implemented to protect the net from possible damages.

Still, the deep-sea remains one of the least explored regions on planet Earth.47 Pressures even in the mesopelagic become too great for traditional exploration methods, demanding alternative approaches for deep-sea research. Baited camera stations, small crewed submersibles, and ROVs (remotely operated vehicles) are three methods utilized to explore the ocean’s depths. Because of the difficulty and cost of exploring this zone, current knowledge is limited. Pressure increases at approximately one atmosphere for every 10 meters meaning that some areas of the deep sea can reach pressures of above 1,000 atmospheres. Natural light does not penetrate the deep ocean, with the exception of the upper parts of the mesopelagic. Except for the areas close to the hydrothermal vents, this energy comes from organic material drifting down from the photic zone.

In the Antarctic, for instance, the tremendous ice masses weigh down the continent considerably. Its margin, referred to as the continental shelf, can extend up to 500 metres below the water’s surface; only after this point does the deep sea begin. In contrast, in most other regions, this transition begins just 200 metres below sea level.