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
New data unearths pesticide peril in beehives
21.04.2017 | Cornell University
New rice fights off drought
04.04.2017 | RIKEN
More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.
Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...
Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.
"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...
The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.
Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...
The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...
Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.
Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...
20.04.2017 | Event News
18.04.2017 | Event News
03.04.2017 | Event News
24.04.2017 | Life Sciences
24.04.2017 | Earth Sciences
24.04.2017 | Machine Engineering