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Ultrastructure, development and histopathology of a new densonucleosis vlrus of bloodsucking mosquitoes are described. Mosquito densonucleosis virus is infective to all 4 larval instars, pupae and adults of both sexes. Incubation periods were significantly shorter in older fourth-instar larvae than in third-instar larvae. Infected larvae die during the fourth larval instar or as pupae. The limited field tests conducted on this virus have shown its efficiency for infecting larvae of natural mosquito populations.

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Purpose. The purpose of the work was to demonstrate the applications of methods of database construction on the example of information about rainbow trout and viral infections affecting it. In process of such databases construction for electronic information systems it is necessary to find the ways of biological data preparation for each of solved tasks, than to make an adequate processing of these input data. Further step is the use of the methods of object-oriented system analysis for the aforementioned database construction in optimal way.Methodology. The methods of object-oriented system analysis, ER-diagram design, and the methods of computer databases construction were used in process of present work fulfillment.Findings. At the initial stage of the work some fish databases known in the world were observed. The peculiarities of biological objects (fishes) that have to be taken into account for this task fulfillment were analyzed. Further the approach of object-oriented analysis for constructing of computer databases in optimal manner was suggested. The first logical steps of algorithm for construction of databases with relative information about fish were described as well the practical recommendations for the development of databases with information concerning domestic biological organisms (on example of rainbow trout, its viral infection) for electronic information systems were done.Originality. No large-scale implementation of contemporary information-computer technologies in Ukraine was done yet. The obtained results would be contributed to further intensive implementation of contemporary information technologies for the development of domestic fishery industry.Practical value. Rainbow trout is important specie for fishery economy; its studying as well as viral infections affecting it are of great value for food safety. Information computer technologies application suggested in the work would make this branch of economy more effective in Ukraine and in the whole world.