Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

When the consumed stuff feels better

25.09.2006
To avoid water bodies being covered with duckweed, that is to avoid covering with the microalgae and cyanobacteriae film, filterer fish, silver carps, for example, are put into lakes and storage ponds. However, specialists of the Institute of Biophysics (Siberian Branch, Russian Academy of Sciences), Krasnoyarsk State University and Krasnoyarsk State Agrarian University have determined that silver carps, although readily swallow the phytoplankton, do not fully digest it. It is for this particular reason, regardless of fish’s effort, water bodies continue to remain covered with duckweed.

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
Further information:
http://www.informnauka.ru

More articles from Agricultural and Forestry Science:

nachricht Alkaline soil, sensible sensor
03.08.2017 | American Society of Agronomy

nachricht New 3-D model predicts best planting practices for farmers
26.06.2017 | Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign

All articles from Agricultural and Forestry Science >>>

The most recent press releases about innovation >>>

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

Im Focus: Fizzy soda water could be key to clean manufacture of flat wonder material: Graphene

Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.

As graphene's popularity grows as an advanced "wonder" material, the speed and quality at which it can be manufactured will be paramount. With that in mind,...

Im Focus: Exotic quantum states made from light: Physicists create optical “wells” for a super-photon

Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.

Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...

Im Focus: Circular RNA linked to brain function

For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.

While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...

Im Focus: RAVAN CubeSat measures Earth's outgoing energy

An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.

The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...

Im Focus: Scientists shine new light on the “other high temperature superconductor”

A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.

Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Call for Papers – ICNFT 2018, 5th International Conference on New Forming Technology

16.08.2017 | Event News

Sustainability is the business model of tomorrow

04.08.2017 | Event News

Clash of Realities 2017: Registration now open. International Conference at TH Köln

26.07.2017 | Event News

 
Latest News

What the world's tiniest 'monster truck' reveals

23.08.2017 | Life Sciences

Treating arthritis with algae

23.08.2017 | Life Sciences

Witnessing turbulent motion in the atmosphere of a distant star

23.08.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>