It was introduced to Europe in the 1960s to supplement the North European Astacus astacus fisheries, which were being damaged by crayfish plague, but the imports turned out to be a carrier of that disease. �UZ������������q�t��q4�(lZ/܊#UMW��E����c�5\ H�J�s�5U�2�2�S ����`[V�����bÚ;�`�(��K�’�\Uy =�B9�� _M¥���,����,�I U��Lȗ����z�b�[YK�I�Œ1�fqC�N�Z�d�  �����԰J}�ne�0ܭ�{@x�B�L��6��Ї��y�(��L�� Brief Guide to Crayfish Identification in the Pacific Northwest December 2009 Signal crayfish (Pacifasticus leniusculus) Washington has only one native crayfish species, the signal crayfish. ���@�Q"�Y� �Liڏ����%S3 S��PdE���=���%'���oB�p*ҘJ�wy�:ڍD��|����-�R�'�`b��O��Stb9�8��!�n%ÕV���#&��a�Un0v� ��jb�s�oF��)bu��˕ck�#�`��q����9. The signal crayfish is now considered an invasive species across Europe, Japan, and California ousting native species there. ��7�WV��a��A�\����!,=�oNB����}�!m2)ٍE*�I�1�őBi�-^��n��6����c���*>�r�̔�HNJ��|TK�����L�������i���V�eD y���m;�b��5��s޲K>�?����e�h�4Ξ��i� W�daRDF�g�l���uL ����MO��es��c̮D+D��q��i��-fP�㡳B���fM���[�l ���6��.����(�� )���t�����p��1��A���N\>8�Qq�l_�w��Q�M���-�:Wyv�m��'�LH�L"7V�\]4RYX�[�J�X�����ߊ����v��X�����N>St�v������f�W� Summary of Invasiveness Top of page. endobj The claws are smooth on the top, the undersides are red. The photos and text shown below may be downloaded as a pdf

stream endobj It is fairly easily identified by its uniform brownish or blue‐tinged coloration as adults with a white band In the 1970s, the British government introduced the signal crayfish (Pacifastacus leniusculus) from North Americato UK waters for export to the lucrative Scandinavian market. Trapping alien crayfish also needs an EA licence Identification: The dorsal surface of Signal Crayfish is typically brownish-tan in coloration. For non-native crayfish records post 1975 assume that the population is still present. The claws are large relative to body size and very strong. SIGNAL CRAYFISH An American Alien The body of a Signal is smooth. The signal crayfish is a North American species of crayfish. 3 0 obj

%PDF-1.5 the amateur naturalist. x��\[�$�~?p�C?ځ��s�b0$��gf�%�T����˧?-��n��z�,��B �2�u�T��_��N�p��r��1#̢�%L/\J���_��~�������,`Q�������H����)F�_����-%�/���������������y�O˝8�V��֚6�6��ڰ���b[�R�Z���YWc\-�jBf�V�U�a�hV3[�����g7��N ���_��d�ԁ1�mԱ�[�.�3������˿�����~:S�n�>�J�0���>o�. ?9�s'��(av��Enf��E۸��Ρ�M��u�%҉^��z���$[x���Tm�S��l���բ �^��� ��Mkᄐ�_'��k�B�v � �Z�X��_V��l�gI7���D9����)#P��.� u!�\�a� Z��b`�]2F�2�m�Wp���Q���v�U�r,��I��,� �iq�+���7Z3L��X 6�� A photographic guide to identification for 2 0 obj ��O�Q׎�/�\&��%�Sئ�w����r�{��sz�[�����|�����Q5R�(�'b������:�c�F���e���D;�d5q5�%��N..'���՟�)wRw�?�^�Y3�֛���0wvFy�,�l��腱0����d3l����ou�߭�J�Xs�a| ˗�l 1 0 obj %���� If there is an old record of Signal crayfish expect the population of Signal crayfish to have spread beyond the recorded site unless recent detailed surveys show otherwise. or to survey for them. endobj to the wild it must be killed. �$�v ]�?sR!����'��$E��G�`na��u�ݚ^�阎Ut謱��c��n+Hj̙[? There is only one native crayfish species in Washington - the Signal crayfish (Pacifastacus leniusculus).This species can be identified by its uniform brownish coloration, white or light coloration of the claw joint ,and the smooth surface of its carapace and claws compared to that of nonnative species. It has been found in 28 territories in Europe since the 1960s, largely due to its high adaptability to a wide range of environments. There is a prominent white or bluish patch on each claw at the top of the finger joint - the ‘signal’ patch. Native to western North America, Pacifastacus leniusculus, the American signal crayfish, is one of the top three most invasive crayfish species in the world and the most widespread non-native crayfish in Europe. The spread of this species is threatening the future of our native White-clawed Crayfish. ���8�$���! 'o��m� ����Ow��l��K�{6���9w�C[?

<> Upper surface is a greenish brown colour. The Signal Crayfish digs burrows up to three feet long in river banks where each year it lays more than 250 eggs at a time. The crayfish plague had ravaged native crayfish populations in Europe and it was seen as an attractive commercial species. Lower surface is an orange/red colour. �eE�]�hH��'e� �7 u)o@%��e��A�d�݈\h3��n���~Cl+�^F�u�q���w$�P�UD q���V�>UpZ��[���&�h�� TURKISH CRAYFISH Another Alien Species


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