Trap

Today I made another walk with H0tamer. 
He wanted to show me one of the traps  in the River Gersprenz. They are used to capture signal crayfish. They are invasive and destroy the local ecosystem. The fisher capture a lot of them. In this trap were alone six of them. Have a look at H0tamer's blip to see them. 
In one night they captured about 257 signal crayfish in a length of 200 meters of the river!!!
Here is a short film about them (sorry, only in German)
Obviously they are delicious - they are given away for cooking them.