{"id":1276,"date":"2016-11-14T18:52:35","date_gmt":"2016-11-15T02:52:35","guid":{"rendered":"http:\/\/calsport.org\/fisheriesblog\/?p=1276"},"modified":"2016-11-14T18:52:35","modified_gmt":"2016-11-15T02:52:35","slug":"american-river-salmon-hatchery-begins-taking-salmon","status":"publish","type":"post","link":"https:\/\/calsport.org\/fisheriesblog\/?p=1276","title":{"rendered":"American River Salmon Hatchery Begins Taking Salmon"},"content":{"rendered":"

California Department of Fish and Wildlife has announced<\/a> that it opened the American River Nimbus Hatchery ladder on Nov 2.\u00a0 At the same time, the feds have managed to cool down the river to allow salmon in the river to also begin spawning (Figure 1).\u00a0 The Bureau of Reclamation cooled the river by opening lower level outlets of Folsom Dam for a portion of the day beginning in late October (Figures 2 and 3).\u00a0 This allowed the release of \u00a0colder water from deep in the reservoir into the Nimbus regulating reservoir directly downstream of Folsom Reservoir.\u00a0 There, the cold water mixed with warmer reservoir waters before discharge to the lower American River.<\/p>\n

The real story here is that the feds had to wait until November to cool water both in the river, and in the Nimbus Fish Hatchery just downstream of Nimbus Dam. \u00a0The supply of cold water in Folsom Reservoir is limited this fall because of excessive releases of stored water to the Delta this past summer (see prior post<\/a>).\u00a0 The summer shrinkage of Folsom\u2019s cold-water pool subjected the salmon that entered the lower American River in September and October to a month or more of stress from warm water.\u00a0 That stress will likely reduce survival of pre-spawn and spawning salmon, diminish their success in spawning, and make many of eggs and embryos spawned in the river unviable.<\/p>\n

\"Figure

Figure 1. Water temperature below Nimbus Dam on the lower American River near the Nimbus Hatchery Oct 4 \u2013 Nov 2, 2016. Red line denotes safe water temperature for holding and spawning salmon, and salmon egg survival.<\/p><\/div>\n

\"Figure

Figure 2. Temperature of the water released from Folsom Dam Oct 21 \u2013 Nov 2, 2016. Red circles show the release of water from Folsom\u2019s cold-water pool.<\/p><\/div>\n

\"Figure

Figure 3. Flow releases from Folsom Dam. Red circles depict flow releases of cold water from lower level outlet of dam Oct 21 \u2013 Nov 2, 2016.<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

California Department of Fish and Wildlife has announced that it opened the American River Nimbus Hatchery ladder on Nov 2.\u00a0 At the same time, the feds have managed to cool down the river to allow salmon in the river to … Continue reading →<\/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":[5,12],"tags":[],"class_list":["post-1276","post","type-post","status-publish","format-standard","hentry","category-hatcheries","category-water-quality"],"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\/1276","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=1276"}],"version-history":[{"count":3,"href":"https:\/\/calsport.org\/fisheriesblog\/index.php?rest_route=\/wp\/v2\/posts\/1276\/revisions"}],"predecessor-version":[{"id":1282,"href":"https:\/\/calsport.org\/fisheriesblog\/index.php?rest_route=\/wp\/v2\/posts\/1276\/revisions\/1282"}],"wp:attachment":[{"href":"https:\/\/calsport.org\/fisheriesblog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1276"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/calsport.org\/fisheriesblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1276"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/calsport.org\/fisheriesblog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1276"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}