[Hygienic evaluation of the safety of commercial type of fishes from the Amur River].

The paper gives the results of an integrated assessment of the hygienic parameters of the fish newly caught from the Amur River. Microbiological assay of its muscle tissue for various pollutants (nitrosamines, petroleum products, heavy metals) was used as a basic study. The consequences of the saprophytic and opportunistic bacteria being introduced into the fish with its multicomponent pollution by the toxicants, as well as reduced fish resistance to the causative agents of various diseases are discussed. The investigations show that the fish caught during freezing-over in the main stream of the Amur River falls short its safety requirements. Long-term frozen storage of the fish lowers its nutritional value.

[Seasonal change in the hygienic indices of the quality of fishes from the Amur River].

The paper is the first to present the results of a comprehensive assessment of the seasonal changes in the hygienic indices of the quality of newly caught fishes from the Amur River. Microbiological analysis of their flesh tissues and gills and physicochemical studies has been used as basic techniques for the determination of some classes of volatile substances (nitrocompounds, histamine, trimethylamine, aldehydes, alcohols, ketones, etc.). The consequences of the entry of saprophytic bacteria into the fish contaminated with many pollutants and the specific features of production of volatile products involved in the formation of "chemical" odors are discussed.