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Biotechnological bases of organization of industrial crayfish farm in Ukraine

100%
Marenkov O.
World News of Natural Sciences
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2020
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vol. 28
1-12
EN
Crayfish are valuable invertebrates that are constantly in great demand in all corners of the Earth. Breeding crayfish is not only large-scale production as it can also be arranged in small volumes using pools and installations of closed water supply. Cultivation of crayfish generates profit after a certain period of time, if all biotechnological norms of cultivation are considered. Cultivation of crayfish is a rather promising production, in which it is possible to obtain from 200 to 300% of stable profits during 3–4 years old. The article gives an overview of the technology of growing crayfish, taking into account the characteristics of farming in Ukraine. The basic biotechnological stages of the establishment and operation of the economy are determined, calculations of capital expenditures for the establishment of the economy are presented and the profitability of the project for the production of freshwater crayfish is determined. Cultivation of river crayfish makes it possible to obtain environmentally friendly products that can compete on the markets of Ukraine or EU countries. Also, this way of growing crayfish allows getting stocking material for release in natural reservoirs in order to restore the populations of river crayfish.
2
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Laboratory Manual on General and Special Ichthyology

100%
Marenkov O.
World News of Natural Sciences
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2018
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vol. 18
|
issue 1
1-51
EN
The manual presents the main methods for studying fish. The general features of the external structure of fish are described: the shape of the body, external organs, the structure and functions of the fins, the types of scales, and the structure of the lateral line. The indicators of morphometric studies of fish with the use of meristic and plastic features according to the classical schemes of measuring fish are also presented. A short description of the statistical method of comparative study of two data samples using the Student's test is given. A method for determining the age of fish by scales is described, as well as a methodology for calculating the annual growth of fish. General information on anatomical structure of fishes is also given. Furthermore, methods of studying the fertility of fish, as well as assessing the nutrition of fish, are described. Particular attention is paid to creating fish preparations: the production of the skeleton of fish, the design of fixed moist preparations and the preparation of a stuffed fish. The presented material has visual illustrations, accompanied by short biological information and forms of tabular material design. The proffered material will be useful for students of the biological and ecological profile, students of natural and agrarian faculties, post-graduate students and young scientists.
3
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The zoobenthos structure in the Dniprovske (Zaporizke) reservoir, Ukraine

51%
Petrovsky O., Fedonenko O., Marenkov O.
World News of Natural Sciences
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2020
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vol. 32
87-98
EN
The article presents data on monitoring the species composition of the zoobenthos of the Dnipro reservoir during 2015-2018. It has been found that a biocenosis of Dreissena (Dreissena bugensis, D polymorpha) was formed on the pass of the upper part of the reservoir on slightly silty sand. The bottom layers of water have been found to be slightly exposed to climatic factors due to slow flow; thus seasonal changes in zoobenthos in the profundal biotope are insignificant.
4
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Histology of marbled crayfish Procambarus virginalis (Lyko, 2017): annotated atlas

51%
Marenkov O., Lykholat T., Kurchenko V., Nesterenko O.
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vol. 21
141-153
EN
The educational publication contains microphotographs and description of histological preparations of the structure of marbled crayfish. The above materials may be used both for carrying out laboratory work on disciplines "Histology", "Cytology", "Cell Biology", "Special Practice", and for self-study of relevant educational topics. Designed for specialists in the field of hydrobiology and histology, students and graduate students of institutions of higher education who studying in the field of "091 Biology", "207 Water bioresources and aquaculture" and "162 Biotechnology and bioengineering". The publication contains the results of studies conducted by President’s of Ukraine grant for competitive projects Ф75/142 «The reproductive potential of invasive species of Dnieper region reservoirs and their impact on bioproductivity formation» (№ 0118U006319) of the State Fund for Fundamental Research.
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