{"id":2513,"date":"2019-03-06T12:57:40","date_gmt":"2019-03-06T20:57:40","guid":{"rendered":"http:\/\/calsport.org\/fisheriesblog\/?p=2513"},"modified":"2019-03-06T12:57:40","modified_gmt":"2019-03-06T20:57:40","slug":"longfin-smelt-february-2019","status":"publish","type":"post","link":"https:\/\/calsport.org\/fisheriesblog\/?p=2513","title":{"rendered":"Longfin Smelt February 2019"},"content":{"rendered":"<p>In my last update on the status of longfin smelt (<a href=\"http:\/\/calsport.org\/fisheriesblog\/?p=2005\">February 2018<\/a>), I decried the continuing decline of the Bay-Delta population of longfin, which are listed under the California Endangered Species Act.\u00a0 The fall index for 2018 indicates continued low population levels (Figures 1 and 2), with 10 to 100 times higher production in wetter years than dry years.\u00a0 After the very poor recruitment in 2015 and 2016, there was some recovery in wetter years 2017 and 2018.\u00a0 Despite record low spawner numbers in 2015 and 2016, recruits increased with wetter years 2017 and 2018, which in turn could lead to improvement in 2019 and beyond with indices above 100 (log 2.0 in figure 2) or perhaps even near 1000 (log 3.0 in figure 2).\u00a0 If drought returns, bets are off.<\/p>\n<div id=\"attachment_2514\" style=\"width: 1473px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-2514\" class=\"size-full wp-image-2514\" src=\"http:\/\/calsport.org\/fisheriesblog\/wp-content\/uploads\/2019\/03\/figure1.png\" alt=\"\" width=\"1463\" height=\"675\" srcset=\"https:\/\/calsport.org\/fisheriesblog\/wp-content\/uploads\/2019\/03\/figure1.png 1463w, https:\/\/calsport.org\/fisheriesblog\/wp-content\/uploads\/2019\/03\/figure1-300x138.png 300w, https:\/\/calsport.org\/fisheriesblog\/wp-content\/uploads\/2019\/03\/figure1-768x354.png 768w, https:\/\/calsport.org\/fisheriesblog\/wp-content\/uploads\/2019\/03\/figure1-1024x472.png 1024w, https:\/\/calsport.org\/fisheriesblog\/wp-content\/uploads\/2019\/03\/figure1-500x231.png 500w\" sizes=\"auto, (max-width: 1463px) 100vw, 1463px\" \/><p id=\"caption-attachment-2514\" class=\"wp-caption-text\">Figure 1. Fall Midwater Trawl Index for longfin smelt, 1967-2018. Source: <a href=\"http:\/\/www.dfg.ca.gov\/delta\/data\/fmwt\/indices.asp\">http:\/\/www.dfg.ca.gov\/delta\/data\/fmwt\/indices.asp<\/a><\/p><\/div>\n<div id=\"attachment_2515\" style=\"width: 1432px\" class=\"wp-caption alignright\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-2515\" class=\"size-full wp-image-2515\" src=\"http:\/\/calsport.org\/fisheriesblog\/wp-content\/uploads\/2019\/03\/figure-2.png\" alt=\"\" width=\"1422\" height=\"1151\" srcset=\"https:\/\/calsport.org\/fisheriesblog\/wp-content\/uploads\/2019\/03\/figure-2.png 1422w, https:\/\/calsport.org\/fisheriesblog\/wp-content\/uploads\/2019\/03\/figure-2-300x243.png 300w, https:\/\/calsport.org\/fisheriesblog\/wp-content\/uploads\/2019\/03\/figure-2-768x622.png 768w, https:\/\/calsport.org\/fisheriesblog\/wp-content\/uploads\/2019\/03\/figure-2-1024x829.png 1024w, https:\/\/calsport.org\/fisheriesblog\/wp-content\/uploads\/2019\/03\/figure-2-371x300.png 371w\" sizes=\"auto, (max-width: 1422px) 100vw, 1422px\" \/><p id=\"caption-attachment-2515\" class=\"wp-caption-text\">Figure 2. Longfin Recruits (Fall Midwater Trawl Index) vs Spawners (Index from two years prior) in Log10 scale. The relationship is very strong and highly statistically significant. Adding Delta outflow in winter-spring as a factor makes the relationship even stronger. Recruits per spawner are dramatically lower in drier, lower-outflow years (red years). Data source: <a href=\"http:\/\/www.dfg.ca.gov\/delta\/data\/fmwt\/indices.asp\">http:\/\/www.dfg.ca.gov\/delta\/data\/fmwt\/indices.asp<\/a>.<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>In my last update on the status of longfin smelt (February 2018), I decried the continuing decline of the Bay-Delta population of longfin, which are listed under the California Endangered Species Act.\u00a0 The fall index for 2018 indicates continued low &hellip; <a href=\"https:\/\/calsport.org\/fisheriesblog\/?p=2513\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[15,6],"tags":[],"class_list":["post-2513","post","type-post","status-publish","format-standard","hentry","category-bay-delta","category-smelt"],"jetpack_featured_media_url":"","jetpack-related-posts":[],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/calsport.org\/fisheriesblog\/index.php?rest_route=\/wp\/v2\/posts\/2513","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/calsport.org\/fisheriesblog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/calsport.org\/fisheriesblog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/calsport.org\/fisheriesblog\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/calsport.org\/fisheriesblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2513"}],"version-history":[{"count":2,"href":"https:\/\/calsport.org\/fisheriesblog\/index.php?rest_route=\/wp\/v2\/posts\/2513\/revisions"}],"predecessor-version":[{"id":2517,"href":"https:\/\/calsport.org\/fisheriesblog\/index.php?rest_route=\/wp\/v2\/posts\/2513\/revisions\/2517"}],"wp:attachment":[{"href":"https:\/\/calsport.org\/fisheriesblog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2513"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/calsport.org\/fisheriesblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2513"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/calsport.org\/fisheriesblog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2513"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}