The point is that some cyanobacteriae and algae species go through the fish’s intestines without being damaged. Moreover, it happens so that cyanobacteriae, having gone en route through the crucian carp, increase the growth rate and fill up the entire water body. The Krasnoyarsk researchers became interested if the silver carp’s intestines possess such invigorating effect.
The subject of their inquiry was the two-year old fish caught in the Berezhskoy storage pond of the Krasnoyarsk Region. The water from the Berezhskoy storage pond filtered via the bacteriological filters was populated with contents of the silver carps’ intestines or by cyanobacteriae collected in the storage pond. The temperature, illumination and airing where microorganisms were kept were as close as possible to the natural conditions. On the fifth day, the phytoplankton spread out in all retorts, and on the seventh day, the growth and photosynthesis of cyanobacteriae from the storage pond began to decline, while the microorganisms resettled from the intestines felt well as before. After eight days of experiment, the growth of cyanobacteriae also became slower in the experiment, but the water still remained greener than that in the case of free living phytoplankton.
The investigations showed that advantage in growth was obtained only by one species of cyanobacteriae - Microcystis aeruginosa - which found themselves in the fish’s intestines. After having been inside the silver carp, these bacteria grow up so much better that they doom the struggle against duckweed to a complete failure. Being consumed does so much good to these cyanobacteriae that they fill up the entire water body which the silver carp has already released from other species of cyanobacteriae and diatomic algae.
Mechanisms of cyanobacteriae stimulation in the course of passing through fish intestines is still unknown. According to some researchers, when cyanobacteriae are going through the digestive tract, they assimilate nutrients, which are present in the intestines in relatively high concentrations, first of all, phosphorus. Nevertheless, in the water bodies covered with duckweed, the nutrients’ concentration is anyway sufficiently high, therefore, such explanation seems unlikely. However, silver carps as well as any other fish can be engaged in fighting against duckweed only after the phytoplankton specific composition has been precisely determined in a particular water body.
Nadezda Markina | alfa
Unique communication strategy discovered in stem cell pathway controlling plant growth
23.03.2018 | Cold Spring Harbor Laboratory
“How trees coexist” – new findings from biodiversity research published in Nature Communications
22.03.2018 | Technische Universität Dresden
Satellites in near-Earth orbit are at risk due to the steady increase in space debris. But their mission in the areas of telecommunications, navigation or weather forecasts is essential for society. Fraunhofer FHR therefore develops radar-based systems which allow the detection, tracking and cataloging of even the smallest particles of debris. Satellite operators who have access to our data are in a better position to plan evasive maneuvers and prevent destructive collisions. From April, 25-29 2018, Fraunhofer FHR and its partners will exhibit the complementary radar systems TIRA and GESTRA as well as the latest radar techniques for space observation across three stands at the ILA Berlin.
The "traffic situation" in space is very tense: the Earth is currently being orbited not only by countless satellites but also by a large volume of space...
An international team of researchers has discovered a new anti-cancer protein. The protein, called LHPP, prevents the uncontrolled proliferation of cancer cells in the liver. The researchers led by Prof. Michael N. Hall from the Biozentrum, University of Basel, report in “Nature” that LHPP can also serve as a biomarker for the diagnosis and prognosis of liver cancer.
The incidence of liver cancer, also known as hepatocellular carcinoma, is steadily increasing. In the last twenty years, the number of cases has almost doubled...
In just a few weeks from now, the Chinese space station Tiangong-1 will re-enter the Earth's atmosphere where it will to a large extent burn up. It is possible that some debris will reach the Earth's surface. Tiangong-1 is orbiting the Earth uncontrolled at a speed of approx. 29,000 km/h.Currently the prognosis relating to the time of impact currently lies within a window of several days. The scientists at Fraunhofer FHR have already been monitoring Tiangong-1 for a number of weeks with their TIRA system, one of the most powerful space observation radars in the world, with a view to supporting the German Space Situational Awareness Center and the ESA with their re-entry forecasts.
Following the loss of radio contact with Tiangong-1 in 2016 and due to the low orbital height, it is now inevitable that the Chinese space station will...
Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP, provider of research and development services for OLED lighting solutions, announces the founding of the “OLED Licht Forum” and presents latest OLED design and lighting solutions during light+building, from March 18th – 23rd, 2018 in Frankfurt a.M./Germany, at booth no. F91 in Hall 4.0.
They are united in their passion for OLED (organic light emitting diodes) lighting with all of its unique facets and application possibilities. Thus experts in...
A new scenario seeking to explain how Mars' putative oceans came and went over the last 4 billion years implies that the oceans formed several hundred million...
23.03.2018 | Event News
19.03.2018 | Event News
16.03.2018 | Event News
23.03.2018 | Materials Sciences
23.03.2018 | Agricultural and Forestry Science
23.03.2018 | Physics and Astronomy