"In the past few days, the death of fish, mostly silver carp, which is an allochthonous and invasive species, but also smaller quantities of dwarf catfish and two perch, has been recorded again in Palić. The PE "Palić-Ludaš" assumes that a large amount of precipitation and a sudden rise in temperature are the cause of death, and that larger quantities of dead fish can be expected in the coming period."-its our local problem in Subotica.Lakes Ludaš and Palić are shallow lakes that are in an unstable ecological balance. On hot days, fish can die, because there is not enough oxygen because the water level in the lake drops.Also we have some factories  that leak their sewage into the lake and pollute it.So we tried to explane our students how to take care of our nature and save fishes.Also learned how to clasified the trash.