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Schmitz, Monika
Publications (10 of 58) Show all publications
Norrgård, J., Bergman, E., Schmitz, M. & Greenberg, L. (2014). Effects of feeding regimes and early maturation on migratory behaviour of landlocked hatchery-reared Atlantic salmon Salmo salar smolts. Journal of Fish Biology, 85(4), 1060-1073
Open this publication in new window or tab >>Effects of feeding regimes and early maturation on migratory behaviour of landlocked hatchery-reared Atlantic salmon Salmo salar smolts
2014 (English)In: Journal of Fish Biology, ISSN 0022-1112, E-ISSN 1095-8649, Vol. 85, no 4, p. 1060-1073Article in journal (Refereed) Published
Abstract [en]

The migratory behaviour of hatchery-reared landlocked Atlantic salmon Salmo salar raised under three different feeding regimes was monitored through the lower part of the River Klarälven, Sweden. The smolts were implanted with acoustic transmitters and released into the River Klarälven, 25 km upstream of the outlet in Lake Vänern. Early mature males, which had matured the previous autumn, were also tagged and released. To monitor migration of the fish, acoustic receivers were deployed along the migratory route. The proportion of S. salar that reached Lake Vänern was significantly greater for fish fed fat-reduced feed than for fish given rations with higher fat content, regardless of ration size. Fish from the early mature male group remained in the river to a greater extent than fish from the three feeding regimes. Smolt status (degree of silvering), as visually assessed, did not differ among the feeding regime groups, and moreover, fully-silvered fish, regardless of feeding regime, migrated faster and had a greater migration success than fish with less developed smolt characteristics. Also, successful migrants had a lower condition factor than unsuccessful ones. These results indicate that the migration success of hatchery-reared S. smolts released to the wild can be enhanced by relatively simple changes in feeding regimes and by matching stocking time with smolt development.

Place, publisher, year, edition, pages
Wiley-Blackwell, 2014
Keywords
acoustic telemetry, fat-reduced feed, fisheries management, migration success, smolt status, stocking
National Category
Biological Sciences Ecology
Research subject
Biology
Identifiers
urn:nbn:se:kau:diva-34005 (URN)10.1111/jfb.12522 (DOI)000342828400005 ()25263187 (PubMedID)
Note

The article was part of J. Norrgårds thesis and was still in manuscript form when the thesis was published.

Available from: 2014-10-04 Created: 2014-10-04 Last updated: 2017-12-05Bibliographically approved
Norrgård, J. R., Greenberg, L. A., Piccolo, J. J., Schmitz, M. & Bergman, E. (2013). Multiplicative loss of landlocked Atlantic salmon Salmo salar L. smolts during downstream migration through multiple dams. Rivers Research and Applications: an international journal devoted to river research and management, 29(10), 1306-1317
Open this publication in new window or tab >>Multiplicative loss of landlocked Atlantic salmon Salmo salar L. smolts during downstream migration through multiple dams
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2013 (English)In: Rivers Research and Applications: an international journal devoted to river research and management, ISSN 1535-1459, E-ISSN 1535-1467, Vol. 29, no 10, p. 1306-1317Article in journal (Refereed) Published
Abstract [en]

Relatively little is known about the downstream migration of landlocked stocks of Atlantic salmon Salmo salar L. smolts, as earlier migration studies have generally focused on upstream migration. However, in watersheds with many hydroelectric plants (HEPs), multiplicative loss of downstream-migrating salmon smolts can be high, contributing to population declines or extirpations. Here we report the results from a study of wild landlocked Atlantic salmon smolts in the River Klaralven. Salmon smolts, tagged with acoustic transmitters, were released at different locations and followed as they passed 37 receivers along a 180-km-long river segment, including eight dams as well as free-flowing control stretches. We found that 16% of the smolts successfully migrated along the entire river segment. Most losses occurred during HEP passages, with 76% of the smolts being lost during these passages, which contrasts with the 8% smolt loss along unregulated control stretches. Migration speed was 83% slower along regulated stretches than along unregulated stretches. The observed lower migration speed at regulated stretches was dependent on fish size, with large fish moving slower than small fish. Discharge affected migration speed but not losses. As previously shown for anadromous populations, our study of landlocked salmon demonstrates similar negative effects of multiple passages of HEPs by downstream-migrating smolts. On the basis of this and previous migration studies, we advocate using a holistic approach in the management and conservation of migratory fish in regulated rivers, which includes safe passage for both upstream- and downstream-migrating fish. Copyright (c) 2012 John Wiley & Sons, Ltd.

Place, publisher, year, edition, pages
John Wiley & Sons, 2013
National Category
Ecology
Research subject
Biology
Identifiers
urn:nbn:se:kau:diva-8801 (URN)10.1002/rra.2616 (DOI)000328420900009 ()
Available from: 2011-11-23 Created: 2011-11-23 Last updated: 2017-12-08Bibliographically approved
Piccolo, J. J., Norrgård, J. R., Greenberg, L. A., Schmitz, M. & Bergman, E. (2012). Conservation of endemic landlocked salmonids in regulated rivers: a case-study from Lake Vänern, Sweden. Fish and Fisheries, 13(4), 418-433
Open this publication in new window or tab >>Conservation of endemic landlocked salmonids in regulated rivers: a case-study from Lake Vänern, Sweden
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2012 (English)In: Fish and Fisheries, ISSN 1467-2960, E-ISSN 1467-2979, Vol. 13, no 4, p. 418-433Article in journal (Refereed) Published
Abstract [en]

Conservation of migratory salmonids requires understanding their ecology at multiple scales, combined with assessing anthropogenic impacts. We present a case-study from over 100 years of data for the endemic landlocked Atlantic salmon (Salmo salar, Salmonidae) and brown trout (Salmo trutta, Salmonidae) in Lake Vänern, Sweden. We use this case-study to develop life history-based research and monitoring priorities for migratory salmonids. In Vänern, small wild populations of salmon and trout remain only in the heavily regulated Rivers Klar (Klarälven) and Gullspång (Gullspångsälven), and commercial and sport fisheries are maintained by hatchery stocking. These populations represent some of the last remaining large-bodied (up to 20 kg) landlocked salmon stocks worldwide. We found that one of four stocks of wild fish has increased since 1996; the other three remain critically low. Hatchery return rates for three of four stocks appear stable at roughly 1% and annual fisheries catch is roughly 75 metric tons, with an estimated 7.5% of hatchery smolts being recruited to the fishery; this also appears relatively stable since 1990. Our analysis reveals much uncertainty in key data requirements, including both river return and fisheries catch rates, estimates of wild smolt production and survival, and hatchery breeding and genetics protocols. These uncertainties, coupled with a lack of information on their riverine and lacustrine ecology, preclude effective management of these unique populations. We conclude with a framework for a life history-based approach to research and monitoring for Vänern salmon and trout, which should be applicable for all endemic, migratory salmonid populations.

National Category
Ecology
Research subject
Biology
Identifiers
urn:nbn:se:kau:diva-8799 (URN)10.1111/j.1467-2979.2011.00437.x (DOI)000310273500004 ()
Available from: 2011-11-23 Created: 2011-11-23 Last updated: 2017-12-08Bibliographically approved
Bergman, E., Piccolo, J., Norrgård, J., Greenberg, L. & Schmitz, M. (2010). Landlocked migrating salmonids in large regulated systems. In: : . Paper presented at Advances in the Population Ecology of Stream Salmonids 17-22 may Luarca, Spain.
Open this publication in new window or tab >>Landlocked migrating salmonids in large regulated systems
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2010 (English)Conference paper, Oral presentation with published abstract (Refereed)
National Category
Biological Sciences
Research subject
Biology
Identifiers
urn:nbn:se:kau:diva-10493 (URN)
Conference
Advances in the Population Ecology of Stream Salmonids 17-22 may Luarca, Spain
Available from: 2012-02-08 Created: 2012-02-08 Last updated: 2015-11-12Bibliographically approved
Calles, O., Schmitz, M., Greenberg, L., Olsson, I., Comoglio, C., Kemp, P. & Blunden, L. (2010). Size-dependent mortality of migratory silver eels at a hydropower plant, and implications for escapement to the sea. Freshwater Biology, 55(10), 2167-2180
Open this publication in new window or tab >>Size-dependent mortality of migratory silver eels at a hydropower plant, and implications for escapement to the sea
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2010 (English)In: Freshwater Biology, ISSN 0046-5070, E-ISSN 1365-2427, Vol. 55, no 10, p. 2167-2180Article in journal (Refereed)
Place, publisher, year, edition, pages
Wiley-Blackwell, 2010
National Category
Biological Sciences
Research subject
Biology
Identifiers
urn:nbn:se:kau:diva-9854 (URN)
Projects
Ålprojekt Ätran
Available from: 2012-02-08 Created: 2012-02-08 Last updated: 2017-12-07Bibliographically approved
Schmitz, M. (2009). Early sexual maturation in Atlantic salmon male parr: the role of metabolic signals. Paper presented at International Workshop on smoltification, Sept. 20-24, 2009, Corvallis, Oregon, USA. Paper presented at International Workshop on smoltification, Sept. 20-24, 2009, Corvallis, Oregon, USA.
Open this publication in new window or tab >>Early sexual maturation in Atlantic salmon male parr: the role of metabolic signals
2009 (English)Conference paper, Published paper (Refereed)
National Category
Biological Sciences
Research subject
Biology
Identifiers
urn:nbn:se:kau:diva-11260 (URN)
Conference
International Workshop on smoltification, Sept. 20-24, 2009, Corvallis, Oregon, USA
Available from: 2012-02-08 Created: 2012-02-08 Last updated: 2013-06-12Bibliographically approved
Bergman, E., Greenberg, L., Piccolo, J., Norrgård, J. & Schmitz, M. (2009). Lax och öring i Klarälven: möjligheter för vild fisk och kvalité på utsatt fisk. Karlstad: Karlstads universitet
Open this publication in new window or tab >>Lax och öring i Klarälven: möjligheter för vild fisk och kvalité på utsatt fisk
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2009 (Swedish)Report (Other academic)
Place, publisher, year, edition, pages
Karlstad: Karlstads universitet, 2009
Series
Arbetsrapport ; 2009:01
National Category
Biological Sciences
Research subject
Biology
Identifiers
urn:nbn:se:kau:diva-11322 (URN)
Available from: 2012-02-08 Created: 2012-02-08 Last updated: 2015-11-12Bibliographically approved
Schmitz, M., Rousseau, K., Aroua, S., Elie, P. & Dufour, S. (2009). Silvering: Metamorphosis or Puberty?. In: G. van den Thillart, S. Dufour & C. Rankin, eds (Ed.), Spawning migration of the European eel: . Dordrecht: Springer
Open this publication in new window or tab >>Silvering: Metamorphosis or Puberty?
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2009 (English)In: Spawning migration of the European eel / [ed] G. van den Thillart, S. Dufour & C. Rankin, eds, Dordrecht: Springer , 2009Chapter in book (Refereed)
Place, publisher, year, edition, pages
Dordrecht: Springer, 2009
National Category
Biological Sciences
Research subject
Biology
Identifiers
urn:nbn:se:kau:diva-11025 (URN)1-4020-9094-3 (ISBN)
Available from: 2012-02-08 Created: 2012-02-08 Last updated: 2013-06-12Bibliographically approved
Schmitz, M., Aroua, S., Rousseau, K., Chang, C.-F. & Dufour, S. (2009). The Gonadoliberin(S)-Gonadotropin(S) Axis in the Eel: Expression and Regulation Under Induced Maturation and Sex Steroid Feedbacks. In: G. van den Thillart, S. Dufour & C. Rankin (Ed.), Spawning migration of the European eel: . Dordrecht: Springer
Open this publication in new window or tab >>The Gonadoliberin(S)-Gonadotropin(S) Axis in the Eel: Expression and Regulation Under Induced Maturation and Sex Steroid Feedbacks
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2009 (English)In: Spawning migration of the European eel / [ed] G. van den Thillart, S. Dufour & C. Rankin, Dordrecht: Springer , 2009Chapter in book (Refereed)
Place, publisher, year, edition, pages
Dordrecht: Springer, 2009
National Category
Biological Sciences
Research subject
Biology
Identifiers
urn:nbn:se:kau:diva-11024 (URN)978-1-4020-9094-3 (ISBN)
Available from: 2012-02-08 Created: 2012-02-08 Last updated: 2013-06-12Bibliographically approved
Maugars, G. & Schmitz, M. (2008). Changes in expression profiles of genes related to sexual maturation during spermatogenesis in testes of early-maturing male Atlantic salmon parr, Salmo salar. CYBIUM, International Journal of Ichthyology, 32(2)
Open this publication in new window or tab >>Changes in expression profiles of genes related to sexual maturation during spermatogenesis in testes of early-maturing male Atlantic salmon parr, Salmo salar
2008 (English)In: CYBIUM, International Journal of Ichthyology, Vol. 32(2)Article in journal (Refereed)
National Category
Biological Sciences
Research subject
Biology
Identifiers
urn:nbn:se:kau:diva-17624 (URN)
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2013-01-21
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