Berlin (dpa / bb) - In Berlin, in addition to American red marsh crabs, marble crabs are also to be fished for the first time this year.
The fishing season started in April, but the quantities are not worth mentioning because of the cool temperatures, said Derk Ehlert, wildlife expert in Berlin's environmental administration.
The marble crabs live in the Grunewaldsee and in the Groß Glienicker See, in which quantities it is still unclear.
Because of the cold, they are still inactive.
American crayfish have been targeted in the past three years - between 0.9 and 1.3 tons per year.
The fisherman who previously caught the marsh crabs will now also set up pots for marble crabs.
Both are invasive species that can endanger the native flora and fauna.
The marble crab has developed from a mere aquarium inhabitant to a globally feared wolverine.
It has spread more and more in the wild in the past two decades - also because anglers introduced the crab as live bait into water.
He was also abandoned or flushed down the toilet.
The animals, which are usually around twelve centimeters long, threaten native cancers not only because of the competition for food, but also because they are carriers of cancer plague.
According to Ehlert, a total of five invasive, alien crustacean species are currently detected in Berlin's waters.
These also include the crayfish, the Galician crab and the crab.
Marsh and marble crabs are the most problematic species and are therefore also targeted, according to Ehlert.
© dpa-infocom, dpa: 210504-99-456479 / 2