Abstract
The salmonid lifecycle has been studied for over a 100 years. Our literature search indicated that the Atlantic salmon (Salmo salar) and brown trout (Salmo trutta) are among the most studied of fish species. By reviewing both their anadromous and non-anadromous lifecycles, we show that there is a growing body of evidence of considerable variation in many aspects of their lifecycle. However, variation in migration patterns and life history strategies are still poorly studied and not well understood, such as juvenile autumn migration, repeat spawning, marine migrations, straying and homing. Growing evidence supports a group of downstream autumn migrants in both species, which may represent as much as 25–40% of the spring class. Some males and females mature sexually as parr very early in life. They probably contribute to genetic variation and stability to populations in a changing environment and are likely very common in many rivers, but rarely considered. Information on marine migrations have been restricted by available methods, and particularly for brown trout, this may have resulted in underestimating straying and long-distance migrations. Repeat spawning is another understudied aspect of the salmonid life history but should be viewed as an opportunity to understand ecological and evolutionary dynamics. We conclude that both brown trout and Atlantic salmon appear to have aspects of their lifecycle overlooked, and that the description of their lifecycle should acknowledge the variation we observe in natural systems as well as the flexibility between strategies.
Similar content being viewed by others
References
Aarestrup K, Jepsen N (1998) Spawning migration of brown trout (Salmo trutta (L)) in a Danish river. Hydrobiologia 371(372):275–281
Aarestrup K, Baktoft H, Thorstad EB, Svendsen JC, Höjesjö J, Koed A (2015) Survival and progression rates of anadromous brown trout kelts Salmo trutta during downstream migration in freshwater and at sea. Mar Ecol Prog Ser 535:185–195
Aarestrup K, Birnie-Gauvin K, Larsen MH (2018) Another paradigm lost? Autumn downstream migration of juvenile brown trout: evidence for a presmolt migration. Ecol Freshw Fish 27:513–516
Allan IRH, Ritter JA (1977) Salmonid terminology. ICES J Mar Sci 37:293–299
Baglinière JL, Maisse G (1985) Precocious maturation and smoltification in wild Atlantic salmon in the Armorican Massif, France. Aquaculture 45:249–263
Barson NJ, Aykanat T, Hindar K, Baranski M, Bolstad GH, Fiske P et al (2015) Sex-dependent dominance at a single locus maintains variation in age at maturity in salmon. Nature 528:405
Berg LS (1935) Materials on salmon biology. Izvestia VNIORKH 20:1–113 (in Russian)
Berg LS (1948) Fishes of freshwaters in the USSR and neighbouring countries. USSR Academy of Sciences Press, Moscow (in Russian)
Berg OK, Berg M (1987) Migrations of brown trout, Salmo trutta L., from the Vardnes river in northern Norway. J Fish Biol 31:113–121
Berg OK, Jonsson B (1990) Growth and survival rates of the anadromous trout, Salmo trutta, from the Vardnes River, northern Norway. Environ Biol Fish 29:145–154
Berglund I (1992) Growth and early sexual maturation in Baltic salmon (Salmo salar) parr. Can J Zool 70:205–211
Berthold P (1999) A comprehensive theory for the evolution, control and adaptability of avian migration. Ostrich 70:1–11
Birnie-Gauvin K, Aarestrup K (2018) A call for a paradigm shift: assumed-to-be premature migrants actually yield good returns. Ecol Freshw Fish 28:62–68
Birnie-Gauvin K, Franklin P, Wilkes M, Aarestrup K (2019a) Moving beyond fitting fish into equations: progressing the fish passage debate in the Anthropocene. Aquat Conserv Mar Freshw Ecosyst 29:1095–1105
Birnie-Gauvin K, Flavio H, Kristensen ML, Walton-Rabideau S, Cooke SJ, Willmore WG, Koed A, Aarestrup K (2019b) Cortisol predicts migration timing and success in both Atlantic salmon and sea trout kelts. Sci Rep 9:2422
Bjornn TC (1971) Trout and salmon movements in two Idaho streams as related to temperature, food, stream flow, cover, and population density. Trans Am Fish Soc 100:423–438
Björnsson BT, Thorarensen H, Hirano T, Ogasawara T, Kristinsson JB (1989) Photoperiod and temperature affect plasma growth hormone levels, growth, condition factor and hypoosmoregulatory ability of juvenile Atlantic salmon (Salmo salar) during parr-smolt transformation. Aquaculture 82:77–91
Björnsson BT, Stefansson SO, Hansen T (1995) Photoperiod regulation of plasma growth hormone levels during parr-smolt transformation of Atlantic salmon: implications for hypoosmoregulatory ability and growth. Gen Comp Endocrinol 100:73–82
Boel M, Aarestrup K, Baktoft H, Larsen T, Madsen SS, Malte H, Skov C, Svendsen JC, Koed A (2014) The physiological basis of the migration continuum in brown trout (Salmo trutta). Physiol Biochem Zool 87:334–345
Bond MH, Miller JA, Quinn TP (2015) Beyond dichotomous life histories in partially migrating populations: cessation of anadromy in a long-lived fish. Ecology 96:1899–1910
Bordeleau X, Davidsen JG, Eldøy SH, Sjursen AD, Whoriskey FG, Crossin GT (2018) Nutritional correlates of spatiotemporal variations in the marine habitat use of brown trout (Salmo trutta) veteran migrants. Can J Fish Aquat Sci 75:1744–1754
Chittenden CM, Ådlandsvik B, Pedersen OP, Righton D, Rikardsen AH (2013a) Testing a model to track fish migrations in polar regions using pop-up satellite archival tags. Fish Oceanogr 22:1–13
Chittenden CM, Fauchald P, Rikardsen AH (2013b) Important open-ocean areas for northern Atlantic salmon (Salmo salar)—as estimated using a simple ambient temperature approach. Can J Fish Aquat Sci 70:101–104
Cooke SJ, Hinch SG, Wikelski M, Andrews RD, Kuchel LJ, Wolcott TG, Butler PJ (2004) Biotelemetry: a mechanistic approach to ecology. Trends Ecol Evol 19:334–343
Crossin GT, Hatcher BG, Denny S, Whoriskey K, Orr M, Penney A, Whoriskey FG (2016) Condition-dependent migratory behaviour of endangered Atlantic salmon smolts moving through an inland sea. Conserv Physiol 4:cow018
Cucherousset J, Ombredane D, Charles K, Marchand F, Baglinière JL (2005) A continuum of life history tactics in a brown trout (Salmo trutta) population. Can J Fish Aquat Sci 62:1600–1610
Cunjak RA, Chadwick EMP, Shears M (1989) Downstream movements and estuarine residence by Atlantic salmon parr (Salmo salar). Can J Fish Aquat Sci 46:1466–1471
Degerman E, Leonardsson K, Lundqvist H (2012) Coastal migrations, temporary use of neighbouring rivers, and growth of brown trout (Salmo trutta) from nine northern Baltic Sea rivers. ICES J Mar Sci 69:971–980
Dellefors C, Faremo U (1988) Early sexual maturation in males of wild brown trout, Salmo trutta L., inhibits smoltification. J Fish Biol 33:741–749
del Villar-Guerra D (2015) The marine life of sea trout (Salmo trutta): Aspects of their migratory behaviour and survival. Dissertation, Technical University of Denmark
Downton PR, Reddin DG (2004) Status of Atlantic salmon (Salmo salar L.) in Campbellton River, Notre Dame Bay (SFA 4), Newfoundland in 2003. Fisheries and Oceans Canada 2004/043
Drenner SM, Clark TD, Whitney CK, Martins EG, Cooke SJ, Hinch SG (2012) A synthesis of tagging studies examining the behaviour and survival of anadromous salmonids in marine environments. PLoS ONE 7:e31311
Ducharme LJA (1969) Atlantic salmon returning for their fifth and sixth consecutive spawning trips. J Fish Board Can 26:1661–1664
Einarsson SM, Mills DH, Johannsson V (1990) Utilisation of fluvial and lacustrine habitat by anadromous Atlantic salmon, Salmo salar L., in an Icelandic watershed. Fish Res 10:53–71
Einarsson SM, Guðjónsson S, Jónsson IR, Guðbrandsson J (2018) Deep-diving of Atlantic salmon (Salmo salar) during their marine feeding migrations. Environ Biol Fish 101:1707–1715
Eldøy SH, Davidsen JG, Thorstad EB, Whoriskey F, Aarestrup K, Næsje TF, Rønning L, Sjursen AD, Rikardsen AH, Arnekleiv JV (2015) Marine migration and habitat use of anadromous brown trout (Salmo trutta). Can J Fish Aquat Sci 72:1366–1378
Erkinaro J, Gibson RJ (1997) Movements of Atlantic salmon, Salmo salar L., parr and brook trout, Salvelinus fontinalis (Mitchill), in lakes, and their impact on single-census population estimation. Fish Manage Ecol 4:369–384
Erkinaro J, Czorlich Y, Orell P, Kuusela J, Falkegård M, Länsman M, Pulkkinen H, Primmer CR, Niemelä E (2018) Life history variation across four decades in a diverse population complex of Atlantic salmon in a large subarctic river. Can J Fish Aquat Sci 76:42–55
Euzenat G, Fournel F, Richard A (1999) Brown trout (Salmo trutta L.) in Normandy and Picardy. In: Baglinière JL, Maisse G (eds) Biology and ecology of the brown and brown trout. Springer, London, pp 175–203
Ferguson A (2006) Genetics of brown trout, with particular reference to Britain and Ireland. In: Harris G, Milner N (eds) Brown trout: biology, conservation and management. Wiley-Blackwell, New Jersey, pp 157–182
Fleming IA (1996) Reproductive strategies of Atlantic salmon: ecology and evolution. Rev Fish Biol Fish 6:379–416
Gibbons WJ, Andrews KM (2004) PIT tagging: simple technology at its best. Bioscience 54:447–454
Gilbey J, Wennevik V, Bradbury IR, Fiske P, Hansen LP, Jacobsen JA, Potter T (2017) Genetic stock identification of Atlantic salmon caught in the Faroese fishery. Fish Res 187:110–119
Goodwin JC, King RA, Jones JI, Ibbotson A, Stevens JR (2016) A small number of anadromous females drive reproduction in a brown trout (Salmo trutta) population in an English chalk stream. Freshw Biol 61:1075–1089
Halttunen E, Rikardsen AH, Davidsen JG, Thorstad EB, Dempson JB (2009) Survival, migration speed and swimming depth of Atlantic salmon kelts during sea entry and fjord migration. In: Nielsen JL, Arrizabalaga H, Fragoso N, Hobday A, Lutcavage M, Sibert J (eds) Tagging and tracking of marine animals with electronic devices. Springer, Dordrecht, pp 35–49
Halttunen E, Jensen JLA, Næsje TF, Davidsen JG, Thorstad EB, Chittenden CM, Hamel S, Primicerio R, Rikardsen AH (2013) State-dependent migratory timing of postspawned Atlantic salmon (Salmo salar). Can J Fish Aquat Sci 70:1063–1071
Hansen LP, Jonsson B, Morgan RIG, Thorpe JE (1989) Influence of parr maturity on emigration of smolting Atlantic salmon (Salmo salar). Can J Fish Aquat Sci 46:410–415
Hansen MM, Loeschcke V (1996) Genetic differentiation among Danish brown trout populations, as detected RFLP analysis of PCR amplified mitochondrial DNA segments. J Fish Biol 48:422–436
Hansen MM, Ruzzante DE, Nielsen EE, Bekkevold D, Mensberg KLD (2002) Long-term effective population sizes, temporal stability of genetic composition and potential for local adaptation in anadromous brown trout (Salmo trutta) populations. Mol Ecol 11:2523–2535
Hedger RD, Hatin D, Dodson JJ, Martin F, Fournier D, Caron F, Whoriskey FG (2009) Migration and swimming depth of Atlantic salmon kelts Salmo salar in coastal zone and marine habitats. Mar Ecol Prog Ser 392:179–192
Hedger RD, Rikardsen AH, Strøm JF, Righton DA, Thorstad EB, Næsje TF (2017a) Diving behaviour of Atlantic salmon at sea: effects of light regimes and temperature stratification. Mar Ecol Prog Ser 574:127–140
Hedger RD, Rikardsen AH, Thorstad EB (2017b) Pop-up satellite archival tag effects on the diving behaviour, growth and survival of adult Atlantic salmon at sea. J Fish Biol 90:294–310
Hovgaard K, Skaala Ø, Naevdal G (2006) Genetic differentiation among brown trout, Salmo trutta L., populations from western Norway. J Appl Ichthyol 22:57–61
Huntingford FA, Thorpe JE, de Leaniz CG, Hay DW (1992) Patterns of growth and smolting in autumn migrants from a Scottish population of Atlantic salmon, Salmo salar L. J Fish Biol 41:43–51
Ibbotson AT, Riley WD, Beaumont WR, Cook AC, Ives MJ, Pinder AC, Scott LJ (2013) The source of autumn and spring downstream migrating juvenile Atlantic salmon in a small lowland river. Ecol Freshw Fish 22:73–81
Järvi T, Holmgren K, Rubin JF, Petersson E, Lundberg S, Glimsäter C (1996) Newly-emerged Salmo trutta fry that migrate to the sea-an alternative choice of feeding habit? Nordic J Freshw Res 72:52–56
Jeffries KM, Hinch SG, Gale MK, Clark TD, Lotto AG, Casselman MT, Li S, Rechisky EL, Porter AD, Welch DW, Miller KM (2014) Immune response genes and pathogen presence predict migration survival in wild salmon smolts. Mol Ecol 23:5803–5815
Jensen KW (1968) Seatrout (Salmo trutta L.) of the River Istra, western Norway. Rep Inst Freshw Res Drottningholm 48:187–213
Jensen AJ, Finstad B, Fiske P, Hvidsten NA, Rikardsen AH, Saksgård L (2012) Timing of smolt migration in sympatric populations of Atlantic salmon (Salmo salar), brown trout (Salmo trutta), and Arctic char (Salvelinus alpinus). Can J Fish Aquat Sci 69:711–723
Jensen JLA, Rikardsen AH (2012) Archival tags reveal that Arctic charr Salvelinus alpinus and brown trout Salmo trutta can use estuarine and marine waters during winter. J Fish Biol 81:735–749
Johansen A, Løfting J (1919) Om fiskebestanden og fiskeriet i Gudenåens nedre løb og Randers Fjord. Kommisionen for Havundersøgelser 9, København, pp 1–167 (in Danish)
Jonsson B, Ruud-Hansen J (1985) Water temperature as the primary influence on timing of seaward migrations of Atlantic salmon (Salmo salar) smolts. Can J Fish Aquat Sci 42:593–595
Jonsson N, Jonsson B (1997) Energy allocation in polymorphic brown trout. Funct Ecol 11:310–317
Jonsson N, Jonsson B (2002) Migration of anadromous brown trout Salmo trutta in a Norwegian river. Freshw Biol 47:1391–1401
Jonsson B, Jonsson N (2006) Life history of the anadromous trout Salmo trutta. In: Harris G, Milner N (eds) Brown trout: biology, conservation and management. Wiley-Blackwell, New Jersey, pp 196–223
Jonsson B, Jonsson N (2009) Migratory timing, marine survival and growth of anadromous brown trout Salmo trutta in the River Imsa, Norway. J Fish Biol 74:621–638
Jonsson B, Jonsson N (2011) Maturation and spawning. In: Jonsson B, Jonsson N (eds) Ecology of Atlantic salmon and brown trout: habitat as a template for life histories. Springer, Dordrecht, pp 350–351
Jonsson B, Jonsson N (2014) Naturally and hatchery produced European trout Salmo trutta: do their marine survival and dispersal differ? J Coast Conserv 18:79–87
Klemetsen A, Amundsen PA, Dempson JB, Jonsson B, Jonsson N, O’Connell MF, Mortensen E (2003) Atlantic salmon Salmo salar L., brown trout Salmo trutta L. and Arctic charr Salvelinus alpinus (L.): a review of aspects of their life histories. Ecol Freshw Fish 12:1–59
Kristensen ML, Righton D, del Villar-Guerra D, Baktoft H, Aarestrup K (2018) Temperature and depth preferences of adult brown trout Salmo trutta during the marine migration phase. Mar Ecol Prog Ser 599:209–224
Kristensen ML, Birnie-Gauvin K, Aarestrup K (2019) Behaviour of veteran sea trout Salmo trutta in a dangerous fjord system. Mar Ecol Prog Ser 616:141–153
Kusterle S, Halttunen E, Thorstad EB, Næsje TF, Jensen JLA, Gallo-Bueno A, Olague E, Rikardsen AH (2013) The gill maggot Salmincola salmoneus as an indicator of repeat spawning in Atlantic salmon Salmo salar. J Fish Biol 82:1068–1073
L’Abée-Lund JH (1989) Significance of mature male parr in a small population of Atlantic salmon (Salmo salar). Can J Fish Aquat Sci 46:928–931
Landergren P (2001) Survival and growth of brown trout parr in fresh and brackish water. J Fish Biol 58:591–593
Larsen PF, Nielsen EE, Koed A, Thomsen DS, Olsvik PA, Loeschcke V (2008) Interpopulation differences in expression of candidate genes for salinity tolerance in winter migrating anadromous brown trout (Salmo trutta L.). BMC Genet 9:12
Limburg KE, Landergren P, Westin L, Elfman M, Kristiansson P (2001) Flexible modes of anadromy in Baltic sea trout: making the most of marginal spawning streams. J Fish Biol 59:682–695
Makhrov AA, Artamonova VS, Murza IG, Pashkov AN, Ponomareva MV, Reshetnikov SI, Christoforov OL (2018) Ecological forms of black sea brown trout (Salmo trutta labrax) in the Mzymta River as manifestation of ontogenetic plasticity. Russ J Dev Biol 49:117–127
Marine Institute (2014) Newport Research Facility, Annual Report No. 58, 2013
Mason JC (1976) Response of underyearling coho salmon to supplemental feeding in a natural stream. J Wildl Manag 40:775–788
Moore A, Ives M, Scott M, Bamber S (1998) The migratory behaviour of wild brown trout (Salmo trutta L.) smolts in the estuary of the River Conwy, North Wales. Aquaculture 168:57–68
Moore JW, Yeakel JD, Peard D, Lough J, Beere M (2014) Life-history diversity and its importance to population stability and persistence of a migratory fish: steelhead in two large North American watersheds. J Anim Ecol 83:1035–1046
Myers RA (1984) Demographic consequences of precocious maturation of Atlantic salmon (Salmo salar). Can J Fish Aquat Sci 41:1349–1353
Nall GH (1923) Brown trout of the River Tweed. Fishery Board for Scotland Tagging in the River Tweed in Scotland. Fishery Board for Scotland Salmon Fisheries No. V
Nielsen C, Aarestrup K, Madsen SS (2006) Comparison of physiological smolt status in descending and nondescending wild brown trout (Salmo trutta) in a Danish stream. Ecol Freshw Fish 15:229–236
Niemelä E, Erkinaro J, Julkunen M, Hassinen E, Länsman M, Brørs S (2006) Temporal variation in abundance, return rate and life histories of previously spawned Atlantic salmon in a large subarctic river. J Fish Biol 68:1222–1240
Nilsen TO, Ebbesson LO, Madsen SS, McCormick SD, Andersson E, Björnsson BT, Prunet P, Stefansson SO (2007) Differential expression of gill Na+, K+-ATPaseα-and β-subunits, Na+, K+, 2Cl-cotransporter and CFTR anion channel in juvenile anadromous and landlocked Atlantic salmon Salmo salar. J Exp Biol 210:2885–2896
Nyqvist D, Calles O, Bergman E, Hagelin A, Greenberg LA (2016) Post-spawning survival and downstream passage of landlocked Atlantic salmon (Salmo salar) in a regulated river: is there potential for repeat spawning? River Res Appl 32:1008–1017
Palstra FP, O’Connell MF, Ruzzante DE (2009) Age structure, changing demography and effective population size in Atlantic salmon (Salmo salar). Genetics 182:1233–1249
Parry G (1960) The development of salinity tolerance in the salmon, Salmo salar (L.) and some related species. J Exp Biol 37:425–434
Pemberton R (1976) Brown trout in North Argyll sea lochs: II. Diet. J Fish Biol 9:195–208
Pinder AC, Riley WD, Ibbotson AT, Beaumont WRC (2007) Evidence for an autumn downstream migration and the subsequent estuarine residence of 0+ year juvenile Atlantic salmon Salmo salar L., in England. J Fish Biol 71:260–264
Poole WR, Whelan KF, Dillane MG, Cooke DJ, Matthews M (1996) The performance of brown trout, Salmo trutta L., stocks from the Burrishoole system western Ireland, 1970–1994. Fish Manag Ecol 3:73–92
Pratten DJ, Shearer WM (1983) The migrations of North Esk brown trout. Aquac Res 14:99–113
Primmer CR, Veselov AJ, Zubchenko A, Poututkin A, Bakhmet I, Koskinen MT (2006) Isolation by distance within a river system: genetic population structuring of Atlantic salmon, Salmo salar, in tributaries of the Varzuga River in northwest Russia. Mol Ecol 15:653–666
Prunet P, Boeuf G, Bolton JP, Young G (1989) Smoltification and seawater adaptation in Atlantic salmon (Salmo salar): plasma prolactin, growth hormone, and thyroid hormones. Gen Comp Endocrinol 74:355–364
Quinn TP, McGinnity P, Reed TE (2015) The paradox of “premature migration” by adult anadromous salmonid fishes: patterns and hypotheses. Can J Fish Aquat Sci 73:1015–1030
Rikardsen AH, Hansen LP, Jensen AJ, Vollen T, Finstad B (2008) Do Norwegian Atlantic salmon feed in the northern Barents Sea? Tag recoveries from 70 to 78 N. J Fish Biol 72:1792–1798
Rikstad A (2012) Sjøauremerkinger i Namdalen. Resultat av merkinger i perioden 2002-06. Fylkesmannen i Nord-Trøndelag nr 2012-2 (in Norwegian)
Riley WD, Eagle MO, Ives SJ (2002) The onset of downstream movement of juvenile Atlantic salmon, Salmo salar L., in a chalk stream. Fish Manage Ecol 9:87–94
Riley WD, Ibbotson AT, Lower N, Cook AC, Moore A, Mizuno S, Pinder AC, Beaumont WRC, Privitera L (2008) Physiological seawater adaptation in juvenile Atlantic salmon (Salmo salar) autumn migrants. Freshw Biol 53:745–755
Riley WD, Ibbotson AT, Beaumont WRC (2009) Adult returns from Atlantic salmon, Salmo salar, parr autumn migrants. Fish Manage Ecol 16:75–76
Riley WD, Ibbotson AT, Beaumont WR, Pawson MG, Cook AC, Davison PI (2011) Predation of the juvenile stages of diadromous fish by sea bass (Dicentrarchus labrax) in the tidal reaches of an English chalk stream. Aquat Conserv Mar Freshw Ecosyst 21:307–312
Saura M, Caballero A, Caballero P, Moran P (2008) Impact of precocious male parr on the effective size of a wild population of Atlantic salmon. Freshw Biol 53:2375–2384
Strøm JF, Thorstad EB, Hedger RD, Rikardsen AH (2018) Revealing the full ocean migration of individual Atlantic salmon. Anim Biotelemetry 6:2
Strøm JF, Rikardsen AH, Campana SE, Righton D, Carr J, Aarestrup K, Stokesbury MJW, Gargan P, Javierre PC, Thorstad EB (2019) Ocean predation and mortality of adult Atlantic salmon. Sci Rep 9:7890
Summers DW (1996) Differences in the time of river entry of Atlantic salmon, Salmo salar L., spawning in different parts of the River North Esk. Fish Manage Ecol 3:209–218
Svedäng H, Wickström H (1997) Low fat contents in female silver eels: indications of insufficient energetic stores for migration and gonadal development. J Fish Biol 50:475–486
Taal I, Kesler M, Saks L, Rohtla M, Verliin A, Svirgsden R, Jürgens K, Vetemaa M, Saat T (2014) Evidence for an autumn downstream migration of Atlantic salmon Salmo salar (Linnaeus) and brown trout Salmo trutta (Linnaeus) parr to the Baltic Sea. Helgol Mar Res 68:373–377
Taal I, Rohtla M, Saks L, Svirgsden R, Kesler M, Matetski L, Vetemaa M (2017) Evidence of Atlantic salmon Salmo salar fry movement between fresh water and a brackish environment. J Fish Biol 91:695–703
Taal I, Rohtla M, Saks L, Kesler M, Jürgens K, Svirgsden R, Matetski L, Verliin A, Paiste P, Vetemaa M (2018) Parr dispersal between streams via a marine environment: a novel mechanism behind straying for anadromous brown trout? Ecol Freshw Fish 27:209–215
Tanguy JM, Ombredane D, Baglinière JL, Prunet P (1994) Aspects of parr-smolt transformation in anadromous and resident forms of brown trout (Salmo trutta) in comparison with Atlantic salmon (Salmo salar). Aquaculture 121:51–63
Thorstad EB, Whoriskey FG, Rikardsen AH, Aarestrup K (2011) Aquatic nomads: the life and migrations of the Atlantic salmon. In: Aas Ø, Einum S, Klemetsen A, Skurdal J (eds) Atlantic salmon ecology. Wiley-Blackwell, New Jersey, pp 1–32
Thorstad EB, Whoriskey F, Uglem I, Moore A, Rikardsen AH, Finstad B (2012) A critical life stage of the Atlantic salmon Salmo salar: behaviour and survival during the smolt and initial post-smolt migration. J Fish Biol 81:500–542
Thorstad EB, Todd CD, Bjørn PA, Gargan PG, Vollset KW, Halttunen E, Kålås S, Uglem I, Berg M, Finstad B (2016) Marine life of the brown trout. Mar Biol 163:47
Ugedal O, Finstad B, Damsgård B, Mortensen A (1998) Seawater tolerance and downstream migration in hatchery-reared and wild brown trout. Aquaculture 168:395–405
Verspoor E, Beardmore JA, Consuegra S, García de Leániz C, Hindar K, Jordan WC, Koljonen ML, Mahkrov AA, Paaver T, Sanchez JA, Skaala Ø, Titov S, Cross TF (2005) Population structure in the Atlantic salmon: insights from 40 years of research into genetic protein variation. J Fish Biol 67:3–54
Went AEJ (1962) Irish sea trout, a review of investigations to date. Sci Proc A R Dublin Soc 10:265–296
Winter ER, Tummers JS, Aarestrup K, Baktoft H, Lucas MC (2016) Investigating the phenology of seaward migration of juvenile brown trout (Salmo trutta) in two European populations. Hydrobiologia 775:139–151
Youngson AF, Buck RJG, Simpson TH, Hay DW (1983) The autumn and spring emigrations of juvenile Atlantic salmon, Salmo salar L., from the Girnock Burn, Aberdeenshire, Scotland: environmental release of migration. J Fish Biol 23:625–639
Acknowledgments
We wish to thank Henry Hershey for his exceptional artwork on the lifecycle. We also wish to thank four anonymous reviewers who have helped us improve this manuscript with valuable insight. This work was supported by the Danish Fishing License funds.
Author information
Authors and Affiliations
Corresponding author
Additional information
Publisher's Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Rights and permissions
About this article
Cite this article
Birnie-Gauvin, K., Thorstad, E.B. & Aarestrup, K. Overlooked aspects of the Salmo salar and Salmo trutta lifecycles. Rev Fish Biol Fisheries 29, 749–766 (2019). https://doi.org/10.1007/s11160-019-09575-x
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11160-019-09575-x