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
Crop achilles' heel costs farmers 10 percent of potential yield
24.01.2017 | Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign
How much drought can a forest take?
20.01.2017 | University of California - Davis
A Swedish-German team of researchers has cleared up a key process for the artificial production of silk. With the help of the intense X-rays from DESY's...
For the first time ever, a cloud of ultra-cold atoms has been successfully created in space on board of a sounding rocket. The MAIUS mission demonstrates that quantum optical sensors can be operated even in harsh environments like space – a prerequi-site for finding answers to the most challenging questions of fundamental physics and an important innovation driver for everyday applications.
According to Albert Einstein's Equivalence Principle, all bodies are accelerated at the same rate by the Earth's gravity, regardless of their properties. This...
An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...
Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...
Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.
While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...
19.01.2017 | Event News
10.01.2017 | Event News
09.01.2017 | Event News
24.01.2017 | Physics and Astronomy
24.01.2017 | Life Sciences
24.01.2017 | Health and Medicine