28 февраля 2020  |  
8:21 PM  July 12, 2019

TPU scientists: peled small fry better survive at chlorella fattening

© пресс-служба Томского политехаTPU scientists: peled small fry better survive at chlorella fattening

TOMSK, Jul 12 - RIA Tomsk. Tomsk Polytechnic University (TPU) specialists with colleagues from research and production association "Tomsk-Ecology" (RPA "TomEco") for the first time conducted experiment on peled small fry growing with addition of a chlorella in a fodder; the survival rate of fry increased significantly, the press service of the university reported on Friday.

Chlorella - is a unicellular alga, the protein concentration in which can reach 50-60%. It contains polyunsaturated fatty acids, minerals, fiber, chlorophyll, various vitamins and other substances that increase its biological value. It is a popular dietary supplement.

Earlier it was reported that TPU scientists are exploring various possibilities of chlorella using, for example, as an additive in feed for pigs and cows, and also developed a cultivator which allows to get chlorella in the form of a liquid solution (it is more efficient), and with the help of which this superfood can be done at home.

Valuable dietary supplement for valuable commercial fish

"(Peled) This is a fish of the whitefish family, a valuable commercial species. Its reserves in the Ob are now undermined, there is the task to restore them. Therefore, at fish farms fryer are obtained and then released into the river. Unfortunately, nature is so arranged that fryer survival in natural conditions is very low ... The task of increasing their survival is very relevant", - explains the importance of the study by the director of the RPA "TomEco" Rashit Khakimov, is quoted by the press office, explains importance of a research.

Previously, experiments of fish feeding with chlorella were carried out repeatedly, but the effect on peled was not studied - it was first made by TPU scientists together with colleagues from "TomEco", which is engaged in restoring aquatic biological resources of the Ob basin and experimental work on aquatic ecosystems.

According to the press service, the experiment took place in the three basins of RPA "TomEco", which contained about 30 thousand fry each. In each of the pools their feeding regime was established: in the first fry received food in the form of crustaceans, in the second - food and chlorella, in the third - only microalgae. Then the fish were transferred to dry food, but twice a day, the experimental groups received chlorella.

© пресс-служба Томского политеха
Pools with fry

Check weighing

"The first sampling was made. The greatest weight was at fryer from the pool where they gave both starter feed and chlorella. But even in the third pool, where the fry received only chlorella, the growth rates were higher than in the pool where they were fed only by traditional feeds", - the project participant, research engineer Oksana Trofimchuk is quoted.

According to her, after the first trial scientists increased the dose of chlorella. The following samples showed that the fry that received both feed and chlorella were twice heavier than those in whose diet there was only feed. In early June, peled fryer was released into a piece of water.

"The results of control weighing showed that adding of chlorella provides greater survival of fry. In those pool where the fry received chlorella against the background of the standard feeding scheme, the survival rate was 64% higher. And in those where fry was fed chlorella without the starting feed, the survival rate increased by 24%. These are very significant figures", - summarizes Trofimchuk.

In July, Tomsk polytechnicians are planning to begin a research on the effect of chlorella on the survival rate of a tench fry (fish from the carp family).

"Now TPU scientists within the framework of the "Ecology" national project are developing the technology of industrial production of microalgae, including chlorella", – the director of the TPU School of Advanced Manufacturing Technologies Aleksey Yakovlev is quoted in the message.

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