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In aquaculture, the application of natural mineral raw materials with their ion exchange and adsorption properties is on the increase, which contributes to an increase in the economic performance of fish farms. The Southern Federal District in Russia, the leader in fish production, has active deposits of zeolites, bentonites and glauconites classified as high-grade mineral raw resources containing up to 70% of active components, though almost not used in fish farming. Our research focuses on studying the productive and biological effect of mineral raw materials of the Southern Federal District (Russia) as a mineral supplement to fish feeds (the case of the zeolites from the Proval'skoe deposit in Rostov Region). Zeolite in the amount of 3% was introduced into the starter feeds for sterlet. The studies have shown that zeolites from the Proval'skoye deposit applied to feeds contribute to an increase in weight growth (p≤0.05) and survival of sterlet, to a feed conversion decrease and an increase in protein and energy efficiency ratio, positively affect the composition of fatty acids and the stability of lipid peroxidation. The results obtained suggest the use of mineral raw materials from the Southern Federal District as a dietary component.

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The article deals with the issue never explored before in Russian legal research: the application of civil law provisions to the regulation of several types of relationships in customs practices. The issue is acute as with the changes in civil law it is necessary to find out whether we need to synchronize with this process the other branches, seemingly not related to civil law. Moreover, the article gives another case in point to the current process of mutual integration in different spheres and branches of law. The authors expand upon the concept of the complex and predominantly public nature of customs legislation and attempt to find out, what limits the civil law has when dealing with the customs regulations. Another interesting point is the interaction between customs and civil law when applied to relations between businesspersons and customs bodies and officials. The article analyzes particular features of representation, storage and warehousing, pledge and guarantee, insurance, when applied in customs practices and the regulation thereof in customs laws. The research uses comparative methods, showing similarities and differences in the approach of the relevant customs regulations in Russia, foreign countries and integrating units such as EU and EAEU. The authors conclude that customs laws and regulations constitute a perfect example of combined use of legal instruments related to different law branches and of different nature for the sake of efficiency of the influenced and regulated system.