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Post-Spawning Survival and Downstream Passage of Landlocked Atlantic Salmon (Salmo salar) in a Regulated River: Is There Potential for Repeat Spawning?
Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för miljö- och livsvetenskaper.ORCID-id: 0000-0002-3098-0594
Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för miljö- och livsvetenskaper.ORCID-id: 0000-0002-8738-8815
Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för miljö- och livsvetenskaper. (Naturresurs rinnande vatten)ORCID-id: 0000-0003-2220-1615
Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för miljö- och livsvetenskaper.ORCID-id: 0000-0002-9683-8080
Vise andre og tillknytning
2016 (engelsk)Inngår i: Rivers Research and Applications: an international journal devoted to river research and management, ISSN 1535-1459, E-ISSN 1535-1467, Vol. 32, nr 5, s. 1008-1017Artikkel i tidsskrift (Fagfellevurdert) Published
Resurstyp
Text
Abstract [en]

Repeat salmonid spawners may make large contributions to total recruitment and long term population stability. Despite their potential importance, relatively little is known about this phase of the life history for anadromous populations, and nothing has been reported for landlocked populations. Here, we studied post-spawning behaviour and survival of landlocked Atlantic salmon in relation to downstream dam passage in the River KlarÀlven, Sweden. Eight hydropower stations separate the feeding grounds in Lake VÀnern from the spawning grounds in the River KlarÀlven, and no measures to facilitate downstream migration are present in the river. Forty-nine percent of the salmon survived spawning and initiated downstream migration. Females and small fish had higher post-spawning survival than males and large fish. The post-spawners migrated downstream in autumn and spring and remained relatively inactive in the river during winter. Downstream migration speed in the free flowing part of the river was highly variable with a median of 9.30km/day. Most fish passed the first hydropower station via upward-opening spill gates after a median residence time in the forebay of 25min. However, no tagged fish survived passage of all eight hydropower stations to reach Lake VÀnern. This result underscores the need for remedial measures to increase the survival of downstream migrating kelts.

sted, utgiver, år, opplag, sider
John Wiley & Sons, 2016. Vol. 32, nr 5, s. 1008-1017
Emneord [en]
migration; kelt; multiple dam passage; telemetry; hydropower; gender difference
HSV kategori
Forskningsprogram
Biologi
Identifikatorer
URN: urn:nbn:se:kau:diva-42458DOI: 10.1002/rra.2926ISI: 000378715500018Scopus ID: 2-s2.0-84931843504OAI: oai:DiVA.org:kau-42458DiVA, id: diva2:930335
Tilgjengelig fra: 2016-05-23 Laget: 2016-05-23 Sist oppdatert: 2022-11-25bibliografisk kontrollert
Inngår i avhandling
1. Atlantic salmon in regulated rivers: Migration, dam passage, and fish behavior
Åpne denne publikasjonen i ny fane eller vindu >>Atlantic salmon in regulated rivers: Migration, dam passage, and fish behavior
2016 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Hydropower dams block migration routes and disrupt longitudinal connectivity in rivers, thereby posing a threat to migratory fish species. Various fish passage solutions have been implemented to improve connectivity with varying success. A well-functioning passage solution must ensure safe and timely passage routes that are used by a substantial portion of the migrating fish. In this thesis, I report the results from telemetry studies where the behavior and survival of migrating Atlantic salmon spawners, post-spawners and smolts have been evaluated in relation to hydropower dam passage. I evaluate downstream passage performance at dams with no passage solutions in the River Klarälven, and with simple passage solutions in in the Winooski River. In the River Ätran, I study both upstream- and downstream passage performance at a dam with sophisticated passage solutions based on the best available technology. In addition, I have studied the survival and behavior of post-spawners and hatchery-released smolts.

A substantial portion of the spawners survived spawning and initiated downstream migration. Most males migrated downstream in autumn following spawning, whereas females tended to stay in the river until spring. For hatchery-reared smolts, early release was associated with faster initiation of migration and higher survival compared to late release. Multiple dam passage resulted in high mortality for both smolts and kelts. For smolts, dam passage, even with simple passage solutions, was associated with substantial delay and mortality. High spill levels were linked to high survival and short delay for downstream migrating salmon. The best available passage solution, which consisted of a nature-like fishway and a low sloping intake rack to guide fish to a bypass, resulted in rapid passage of a large portion of the adult migrants.

sted, utgiver, år, opplag, sider
Karlstad: Karlstads universitet, 2016. s. 41
Serie
Karlstad University Studies, ISSN 1403-8099 ; 42
Emneord
fish migration; fish passage; downstream migration; kelt; smolt
HSV kategori
Forskningsprogram
Biologi
Identifikatorer
urn:nbn:se:kau:diva-46903 (URN)978-91-7063-725-4 (ISBN)
Disputas
2016-12-09, Nyquistsalen 9C 203, Universitetsgatan 2, Karlstad, 10:15 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2016-11-15 Laget: 2016-10-19 Sist oppdatert: 2019-07-12bibliografisk kontrollert

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