Natural range extension from the Baltic Sea basin (Ref. 59054). On the basis of morphological parameters study, Gasterosteus aculeatus could arrive at the Pripyat River basin from the lower Dnieper River.

Records in Belarus:

Basins of the rivers Neman, Zapadnyi Bug (Fishes: popular encyclopedia 1989); Dnieper River and it tributaries (Zhukov et al. 1986; Fishes: popular encyclopedia 1989; Kunitskiy 2001).

Potential ecological impacts:

Gasterosteus aculeatus is a typical coarse fish, which competes for food with commercially important fish species and eats roe of the latter. In many waterbodies, threespine stickleback serves as an intermediate host in life cycles of birds' helminthes (Zhukov 1988).