Jedediah Smith Redwoods State Park, Del Norte County, California
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Jedediah Smith Redwoods State Park, Del Norte County, California
Signal Crayfish (Pacifastacus leniusculus), Gloucestershire.
Signal Crayfish (Pacifastacus leniusculus), Gloucestershire
Pacifastacus leniusculus Signal Crayfish was imported in the fifties to the Danish waters. Now they are a pestilens everywhere. They taste wonderful though
spèce originaire du nord-ouest des Etats-Unis, introduite en France dans les années 1974-1976. C’est l’espèce la plus dangereuse pour les écrevisses à pattes blanches, car elle occupe la même niche écologique. Très prolifique (de 50 à 300 œufs par an), croissance rapide. Elles est un prédateur redoutable pour les autres écrevisses. Elle tolère bien les pollutions mais se plaît tout particulièrement dans les rivières et ruisseaux, aux eaux fraîches et bien oxygénées. Son régime alimentaire est majoritairement carné (poisson).
spèce originaire du nord-ouest des Etats-Unis, introduite en France dans les années 1974-1976. C’est l’espèce la plus dangereuse pour les écrevisses à pattes blanches, car elle occupe la même niche écologique. Très prolifique (de 50 à 300 œufs par an), croissance rapide. Elles est un prédateur redoutable pour les autres écrevisses. Elle tolère bien les pollutions mais se plaît tout particulièrement dans les rivières et ruisseaux, aux eaux fraîches et bien oxygénées. Son régime alimentaire est majoritairement carné (poisson).
Signal Crayfish, Fowlmere RSPB, Cambridgeshire, May 2017.
Invasive species in Czech republic
crabdatabase@gmail.com
Also missing some leg segments. Still, it was able to get around.
The largest of four that I saw in the same area today.
This crayfish approached my camera.
This is a male Signal Crayfish (Pacifastacus leniusculus), introduced to Britain from North America in the 1960s. Unfortunately these animals carried a disease that proved fatal to our native White-clawed Crayfish (Austropotamobius pallipes), which are increasingly rare in Britain. I spotted several in one of my local streams. I removed this large male and popped him on the bank to phpotograph him. He was rather feisty and backed into a corner waving his open claws at me. I crouched down low and managed to get a shot showing the bright orange underside of his claws. Here is a photograph of the rare native White-clawed Crayfish showing its smaller, pale claws www.flickr.com/photos/timmelling/9831997276/
Signal Crayfish - Pacifastacus leniusculus (Dana, 1852) [more of this species]
Date: October 1, 2011
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