Data files to Sarabeev et al. (2023) Database on eukaryotic symbionts of native and invasive gammarids (Crustacea, Amphipoda) in the Baltic region of Poland with information on water parameters for sampling sites

The material of database is composed of three Microsoft® Excel files. The main file represents the raw data on the number of individuals of each eukaryotic symbiont taxa recorded in each host and location.

The data set is contained information on the assemblage of symbionts per host individual in one text-table matrix; macro- (host) and microsymbiont taxa name, host length, the date of collection, the geographic coordinates and locality name in columns; and amphipod host specimens in lines. One file reports the microsymbiont species list with information on host species, sampling date, locality and geographic coordinates, infection site, obtained sequences (if the case), brief morphological characteristics and microphotographs.