{"id":105,"date":"2021-11-08T10:06:48","date_gmt":"2021-11-08T19:06:48","guid":{"rendered":"https:\/\/aoan.aoos.org\/?page_id=105"},"modified":"2022-06-02T09:03:55","modified_gmt":"2022-06-02T17:03:55","slug":"crab","status":"publish","type":"page","link":"https:\/\/aoan.aoos.org\/impacts\/species-response\/crab\/","title":{"rendered":"Crab"},"content":{"rendered":"

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\"\" Crab<\/h1>\n

[\/et_pb_text][\/et_pb_column][et_pb_column type=”1_4″ _builder_version=”4.17.1″ _module_preset=”default” custom_padding=”||0px||false|false” custom_css_main_element=”display: flex;||flex-direction: column;||justify-content: flex-end;” global_colors_info=”{}”][et_pb_menu menu_id=”13″ menu_style=”centered” admin_label=”Menu – Species Response” _builder_version=”4.17.1″ _module_preset=”default” menu_font=”|||on|||||” menu_font_size=”16px” module_alignment=”center” custom_margin=”||0px||false|false” custom_padding=”||0px||false|false” custom_css_main_element=”display: flex;||flex-direction: column;||justify-content: flex-end;” border_color_bottom=”#000000″ locked=”off” global_colors_info=”{}”][\/et_pb_menu][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.17.1″ _module_preset=”default” custom_margin=”0px||||false|false” custom_padding=”0px||||false|false” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.17.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_divider color=”#4d4d4d” _builder_version=”4.17.0″ _module_preset=”default” min_height=”20.8px” custom_margin=”||-1px|||” locked=”off” global_colors_info=”{}”][\/et_pb_divider][et_pb_gallery gallery_ids=”22518,22519,22520,22521″ fullwidth=”on” disabled_on=”on|on|on” module_id=”species-gallery” _builder_version=”4.17.1″ _module_preset=”default” background_color=”#f4f4f9″ background_layout=”dark” max_height_tablet=”” max_height_phone=”” max_height_last_edited=”on|desktop” auto=”on” auto_speed=”15000″ custom_css_gallery_pagination=”display:none;” disabled=”on” global_colors_info=”{}” max_height__hover_enabled=”on|desktop”][\/et_pb_gallery][et_pb_image src=”https:\/\/aoan.aoos.org\/wp-content\/uploads\/2022\/04\/hero-Ovigerous-snow-crab-OA-scaled.jpg” title_text=”Ovigerous Snow Crab” _builder_version=”4.17.3″ _module_preset=”default” global_colors_info=”{}”][\/et_pb_image][et_pb_text disabled_on=”off|off|off” admin_label=”Caption – An egg bearing snow from an experiment looking at how ocean acidification affected the embryo development.” module_class=”image-caption” _builder_version=”4.17.4″ _module_preset=”default” text_font=”||||||||” text_font_size=”13px” text_line_height=”1.5em” border_width_bottom=”1px” border_color_bottom=”#4d4d4d” locked=”off” global_colors_info=”{}”]<\/p>\n

An egg bearing snow from an experiment looking at how ocean acidification affected the embryo development.<\/span><\/p>\n

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What We Know<\/h2>\n

A general pattern has emerged from the body of research conducted on these crab species in Alaska thus far: crab survival decreases at most life stages when they are exposed to more acidic water<\/strong>.<\/p>\n

Red king crab and Tanner crab are most sensitive to more acidic (higher CO2<\/sub>) water. Studies consistently show decreased growth and increased mortality at multiple life-history stages in both species. The most likely reason for this is that the crabs have to spend a lot of energy on basic life-sustaining functions in more acidic water. This leaves less energy for other critical activities like growing and fighting disease. While blue and golden king crabs are still sensitive, they seem to be less sensitive than red king and Tanner crabs. Snow crabs are the only species that appear resilient to more acidic water. Since Tanner and snow crabs are closely related, NOAA\u2019s Kodiak Laboratory is planning to conduct more experiments to understand why Tanner crabs are sensitive and snow crabs are resistant. This work will include looking at how their blood chemistry changes in acidic waters and measuring gene expression.<\/p>\n

There are currently no Alaska-based Dungeness studies underway. To learn more about Dungeness crab OA response in the lower 48, visit NOAA\u2019s Dungeness Crab Case Study<\/a>.<\/p>\n

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Meet the Crabs<\/h4>\n

Crabs are crustaceans with soft bodies protected by a calcified exoskeleton. A variety of marine crab species are harvested for consumption across the globe, with approximately one-third of annual US crab catches coming from the Bering Sea, Aleutian Islands, and the Gulf of Alaska. Of the ten species of crab that are commercially important in Alaska, ocean acidification researchers have focused their efforts on these six species: red king crab, blue king crab, golden king crab, Tanner crab, snow crab, and Dungeness crab.<\/p>\n

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Photo Gallery<\/strong><\/h4>\n

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↓Click to enlarge↓<\/p>\n

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Recent Studies<\/h2>\n

NOAA\u2019s Kodiak Laboratory has been conducting research on the effects of ocean acidification on commercial crab species for 15 years. Over that time, we\u2019ve learned a lot about how more acidic waters may affect these species and the fisheries that depend on them. [\/et_pb_text][et_pb_code admin_label=”Code – Script to keep all toggles closed on page load” _builder_version=”4.16″ _module_preset=”default” global_colors_info=”{}”]