Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Fish helps geologists

20.11.2007
The valuable food fish – Antarctic toothfish (D. mawsoni) – can be used as a bottom dredge with a large collection area. Such proposal was made by the specialists of the All-Russian Research Institute of Fish Industry and Oceanography and the Institute of Mineralogy, Geochemistry and Crystal Chemistry of Rare Elements. It makes no difference to the toothfish as the fish swallows stones all the same.

The Antarctic toothfish is a big fish about 135 centimeters long, its average weight making 35 kilograms (although some specimens are known to have an adult man’s parameters: 190 centimeters and 80 kilograms). The toothfish inhabits antarctic waters of the Atlantic and the Indian Oceans southward of the 58th parallel. It can be also found near the coast, and in the open ocean, at the bottom and in mid-water. The Antarctic toothfish was named so for its big mouth full of fang-like teeth. It is a predator, which feeds on squids and fish, but the toothfish itself makes part of the menu of ? sperm-whale and, certainly, of human beings. Such noticeable and useful fish attracted attention of biologists who found stones in the toothfish stomach, the stones being rather heavy, up to half a kilo. Frequency of stomachic stones discovery depends on the fish size. The toothfish shorter than 80 centimeters have no stones in the stomach, stone occurrence with longer fish varies from 0.7% through 1.1%, and with the fish longer than a meter the occurrence increases up to 2.7-3%.

The researchers have not explained yet why the toothfish needs stones. Probably, the fish uses them for grinding food in the stomach, or perhaps as ballast during its migrations up and down the mid-water. The researchers have suggested that the toothfish stomachic stones should be used for the ground composition analysis of the continental slope and the seabed. These areas are hidden from the researchers by ice, and the toothfish is swimming there and swallowing the stones from the bottom. During two fishing seasons, specialists collected stones from the Antarctic toothfish stomachs in the antarctic Ross Sea and Amundsen Sea. The researchers have assumed that the fish swallows stones without distinction, therefore they can be used for geological characteristic of the oceanic bed.

Even preliminary analysis of stones from the Ross Sea bottom enables to provide qualitative assessment of geological structure of the coastal strip and the continental slope. The toothfish swallowed samples of various rock, at that intrusive rock (diorites, granites and others) noticeably prevails, the second place is taken by metamorphic rock, including quartzites, sandstones, aleurites, limestone and a paleocoral fragment. From the Amundsen Sea bottom, the toothfish picks up mainly metamorphic and sedimentary rock, and most unexpectedly, sterile coal with fragments of fossilized wood, which testifies to different geological structure of adjacent sections. Thus, the Ross Sea area corresponds to a larger extent to the shield?, and the Amundsen Sea area – complies with folded area at the platform outskirts.

... more about:
»Antarctic »Fragment »Researchers »SEA »toothfish

The overwhelming majority of stone fragments extracted from the toothfish stomach are of angular shape, more rarely - of faintly waterworn shape, and only individual fragments have the look of coastal pebble, and one of the fragments from the Ross Sea has glacial hatching traces on its surface. Taking into account discovery of intact coral springs, it can be assumed that ice and sea currents carry stones at short distances. It is difficult to say yet how far fish can carry them, but the toothfish caught in the same region has similar stone “filling” in the stomachs, i.e. the fish collects stones at the same sections. Actually, the Antarctic toothfish has provided the researchers with a low-capacity bottom dredge, which covers the area much larger than that in case of ordinary dredging. Now, geologists will disembowel fish for the benefit of science, not only for their own good.

Nadezda Markina | alfa
Further information:
http://www.informnauka.ru

Further reports about: Antarctic Fragment Researchers SEA toothfish

More articles from Life Sciences:

nachricht Platinum nanoparticles for selective treatment of liver cancer cells
15.02.2019 | ETH Zurich

nachricht New molecular blueprint advances our understanding of photosynthesis
15.02.2019 | DOE/Lawrence Berkeley National Laboratory

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Regensburg physicists watch electron transfer in a single molecule

For the first time, an international team of scientists based in Regensburg, Germany, has recorded the orbitals of single molecules in different charge states in a novel type of microscopy. The research findings are published under the title “Mapping orbital changes upon electron transfer with tunneling microscopy on insulators” in the prestigious journal “Nature”.

The building blocks of matter surrounding us are atoms and molecules. The properties of that matter, however, are often not set by these building blocks...

Im Focus: University of Konstanz gains new insights into the recent development of the human immune system

Scientists at the University of Konstanz identify fierce competition between the human immune system and bacterial pathogens

Cell biologists from the University of Konstanz shed light on a recent evolutionary process in the human immune system and publish their findings in the...

Im Focus: Transformation through Light

Laser physicists have taken snapshots of carbon molecules C₆₀ showing how they transform in intense infrared light

When carbon molecules C₆₀ are exposed to an intense infrared light, they change their ball-like structure to a more elongated version. This has now been...

Im Focus: Famous “sandpile model” shown to move like a traveling sand dune

Researchers at IST Austria find new property of important physical model. Results published in PNAS

The so-called Abelian sandpile model has been studied by scientists for more than 30 years to better understand a physical phenomenon called self-organized...

Im Focus: Cryo-force spectroscopy reveals the mechanical properties of DNA components

Physicists from the University of Basel have developed a new method to examine the elasticity and binding properties of DNA molecules on a surface at extremely low temperatures. With a combination of cryo-force spectroscopy and computer simulations, they were able to show that DNA molecules behave like a chain of small coil springs. The researchers reported their findings in Nature Communications.

DNA is not only a popular research topic because it contains the blueprint for life – it can also be used to produce tiny components for technical applications.

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Global Legal Hackathon at HAW Hamburg

11.02.2019 | Event News

The world of quantum chemistry meets in Heidelberg

30.01.2019 | Event News

Our digital society in 2040

16.01.2019 | Event News

 
Latest News

Gravitational waves will settle cosmic conundrum

15.02.2019 | Physics and Astronomy

Spintronics by 'straintronics'

15.02.2019 | Physics and Astronomy

Platinum nanoparticles for selective treatment of liver cancer cells

15.02.2019 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>