'a country gentlemen once bought 10000 crayfishes in the 90’s to plant in a stream running through his land.
in the autumn he would capture about a hundred of them to eat at the annual swedish crayfish parties.
the crayfishes however slowly started to emigrate to another nearby lake outside the patron’s estate.
desperate of seeing his neighbors feast on his crayfishes, he contacted visiondivision to solve his problem.
visiondivision decided to help the patron by building him a refugee where the crayfishes could immigrate back.
by investigating the condition of the stream we soon found out that it was the lack of stones, hiding places
and the lack of calcite that probably had made the crayfishes emigrate. the city planning would focus on
solving these issues.(...)' - visiondivision

LINK


visiondivision also has a link in my favourite blogs...