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Seawater tolerance and post-smolt migration of wild Atlantic salmon Salmo salar × brown trout S. trutta hybrid smolts.
J Fish Biol. 2013 Jan; 82(1):206-27.JF

Abstract

High levels of hybridization between Atlantic salmon Salmo salar and brown trout Salmo trutta have been reported in the River Driva. This study presents the underlying mechanisms of development of seawater (SW) tolerance and marine migration pattern for S. salar×S. trutta hybrids. Migrating S. salar×S. trutta hybrid smolts caught in the River Driva, Norway (a river containing Gyrodactylus salaris), displayed freshwater (FW) gill Na(+), K(+) -ATPase (NKA) activity levels of 11·8 µmol ADP mg protein h(-1), which were equal to or higher than activity levels observed in S. salar and S. trutta smolts. Following 4 days of SW exposure (salinity 32·3), enzyme activity remained high and plasma ion levels were maintained within the normal physiological range observed in S. salar smolts, indicating no signs of ion perturbations in S. salar×S. trutta hybrids. SW exposure induced an increase in NKA α1b-subunit mRNA levels with a concurrent decrease in α1a levels. Salmo salar×S. trutta post-smolts migrated rapidly through the fjord system, with increasing speed with distance from the river, as is often seen in S. salar smolts. The present findings suggest that S. salar×S. trutta smolts, as judged by the activity and transcription of the NKA system, regulation of plasma ion levels and migration speed more closely resemble S. salar than S. trutta.

Authors+Show Affiliations

Norwegian Institute of Water Research, N-7462 Trondheim, Norway. henning.urke@niva.noNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

23331146

Citation

Urke, H A., et al. "Seawater Tolerance and Post-smolt Migration of Wild Atlantic Salmon Salmo Salar × Brown Trout S. Trutta Hybrid Smolts." Journal of Fish Biology, vol. 82, no. 1, 2013, pp. 206-27.
Urke HA, Kristensen T, Arnekleiv JV, et al. Seawater tolerance and post-smolt migration of wild Atlantic salmon Salmo salar × brown trout S. trutta hybrid smolts. J Fish Biol. 2013;82(1):206-27.
Urke, H. A., Kristensen, T., Arnekleiv, J. V., Haugen, T. O., Kjærstad, G., Stefansson, S. O., Ebbesson, L. O., & Nilsen, T. O. (2013). Seawater tolerance and post-smolt migration of wild Atlantic salmon Salmo salar × brown trout S. trutta hybrid smolts. Journal of Fish Biology, 82(1), 206-27. https://doi.org/10.1111/j.1095-8649.2012.03481.x
Urke HA, et al. Seawater Tolerance and Post-smolt Migration of Wild Atlantic Salmon Salmo Salar × Brown Trout S. Trutta Hybrid Smolts. J Fish Biol. 2013;82(1):206-27. PubMed PMID: 23331146.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Seawater tolerance and post-smolt migration of wild Atlantic salmon Salmo salar × brown trout S. trutta hybrid smolts. AU - Urke,H A, AU - Kristensen,T, AU - Arnekleiv,J V, AU - Haugen,T O, AU - Kjærstad,G, AU - Stefansson,S O, AU - Ebbesson,L O E, AU - Nilsen,T O, Y1 - 2012/11/29/ PY - 2013/1/22/entrez PY - 2013/1/22/pubmed PY - 2013/5/29/medline SP - 206 EP - 27 JF - Journal of fish biology JO - J. Fish Biol. VL - 82 IS - 1 N2 - High levels of hybridization between Atlantic salmon Salmo salar and brown trout Salmo trutta have been reported in the River Driva. This study presents the underlying mechanisms of development of seawater (SW) tolerance and marine migration pattern for S. salar×S. trutta hybrids. Migrating S. salar×S. trutta hybrid smolts caught in the River Driva, Norway (a river containing Gyrodactylus salaris), displayed freshwater (FW) gill Na(+), K(+) -ATPase (NKA) activity levels of 11·8 µmol ADP mg protein h(-1), which were equal to or higher than activity levels observed in S. salar and S. trutta smolts. Following 4 days of SW exposure (salinity 32·3), enzyme activity remained high and plasma ion levels were maintained within the normal physiological range observed in S. salar smolts, indicating no signs of ion perturbations in S. salar×S. trutta hybrids. SW exposure induced an increase in NKA α1b-subunit mRNA levels with a concurrent decrease in α1a levels. Salmo salar×S. trutta post-smolts migrated rapidly through the fjord system, with increasing speed with distance from the river, as is often seen in S. salar smolts. The present findings suggest that S. salar×S. trutta smolts, as judged by the activity and transcription of the NKA system, regulation of plasma ion levels and migration speed more closely resemble S. salar than S. trutta. SN - 1095-8649 UR - https://www.unboundmedicine.com/medline/citation/23331146/Seawater_tolerance_and_post_smolt_migration_of_wild_Atlantic_salmon_Salmo_salar_×_brown_trout_S__trutta_hybrid_smolts_ L2 - https://doi.org/10.1111/j.1095-8649.2012.03481.x DB - PRIME DP - Unbound Medicine ER -