caa a22 4500 606226753 CHVBK 20210128101154.0 cr unu---uuuuu 210128e20150101xx s 000 0 eng 10.1007/s10641-014-0272-5 doi (NATIONALLICENCE)springer-10.1007/s10641-014-0272-5 Diversity in sympatric chinook salmon runs: timing, relative fat content and maturation [Elektronische Daten] [James Hearsey, Andrew Kinziger] Since salmon species commonly undertake long spawning migrations and often have multiple runs in the same river system, this study explored the run timing and physiology of sympatric Chinook salmon Oncorhynchus tshawytscha stocks in the Klamath River Basin, CA. Genetic methods revealed that the Trinity-Salmon Spring run entered first, followed by the Klamath Fall run, and the Lower Basin Fall run. The Trinity-Salmon Fall run entered continuously. There was however, considerable overlap in run timing which was thought may be due a morphological threshold being met. Due to longer off-feeding freshwater residency, the earlier-returning fish have higher metabolic demands during their spawning migration and enter freshwater with greater relative fat reserves, estimated by non-water fraction of liver tissue (NWF) and Relative Weight (Wr). They also arrive less mature (as estimated by gonadosomatic index (GSI), which also places a greater demand on their energy reserves for gonadal development. There was a decrease in relative fat reserves and an increase in maturity by freshwater entry date. At spawning however, the Trinity River Hatchery spring- and fall-run fish, after travelling the same distance, had the same relative fat content and size-specific gonad mass and fecundity. The higher energetic cost associated with the early entry of the spring-run fish, and reduced at-sea feeding period, may be the cause for their smaller average body mass. This study suggests that imminent freshwater residency duration is important in determining the relative fat content, maturity leveland size of returning Chinook salmon. Springer Science+Business Media Dordrecht, 2014 Gonadosomatic index nationallicence Non-water fraction nationallicence Spawning nationallicence Migration nationallicence Energetics nationallicence Chinook nationallicence Salmon nationallicence Klamath river nationallicence GSI nationallicence Mixed-stock analysis nationallicence Hearsey James Humboldt State University, 1 Harpst St., 95521, Arcata, CA, USA aut Kinziger Andrew Humboldt State University, 1 Harpst St., 95521, Arcata, CA, USA aut Environmental Biology of Fishes Springer Netherlands 98/1(2015-01-01), 413-423 0378-1909 98:1<413 2015 98 10641 https://doi.org/10.1007/s10641-014-0272-5 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10641-014-0272-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hearsey James Humboldt State University, 1 Harpst St., 95521, Arcata, CA, USA aut NATIONALLICENCE 700 1- Kinziger Andrew Humboldt State University, 1 Harpst St., 95521, Arcata, CA, USA aut NATIONALLICENCE 773 0- Environmental Biology of Fishes Springer Netherlands 98/1(2015-01-01), 413-423 0378-1909 98:1<413 2015 98 10641