Aineiston tiedot

Tekijä (t):Hatanpää, Aurora
Huuskonen, Hannu
Kekäläinen, Jukka
Kortet, Raine
Hyvärinen, Pekka
Vitelletti, Maria Letizia
Piironen, Jorma
Aineiston nimi:Early winter foraging success, swimming performance, and morphology of juvenile landlocked Atlantic salmon reared under semi-wild and hatchery conditions
Verkko-osoite:https://cdnsciencepub.com/doi/pdf/10.1139/cjfas-2019-0079
Aineistolaji:artikkeli
Asiasanat:elinympäristö, genetiikka, järvilohi, kalojen elintavat, vaellus
Kustantaja:Canadian Journal of Fisheries and Aquatic Sciences
Painopaikka:
Vuosi:2020
Sivumäärä:9
ISBN/ISSN:
Lehti/sarja ym.:Canadian Journal of Fisheries and Aquatic Sciences
Lisätietoa:77: 770–778 Several Finnish populations of salmonids have been maintained exclusively by stocking hatchery-reared fish for several generations, and it is crucial to know whether domestication has affected fitness-related traits and to assess how the developmental environment influences fish phenotypes. Here, we focused on Lake Saimaa landlocked salmon (Salmo salar m.sebago) and studied the role of the early rearing environment in trait formation by comparing juveniles (fingerlings) from three backgrounds: (i) semi-wild (stocked as alevins), (ii) standard hatchery, and (iii) enriched hatchery conditions We compared juvenile morphology, swimming performance, and capability of feeding on natural prey in early winter. We found no differences between standard and enriched hatchery conditions. Semi-wild fish consumed more prey items, but wet mass of stomach contents did not differ among backgrounds. Swimming endurance was comparable among backgrounds. Semi-wild fish had slenderer body shape and longer fins than hatchery-reared fish. The lack of performance differences between hatchery juveniles and their semi-wild conspecifics is possibly due to reduced phenotypic plasticity caused by extremely low levels of genetic diversity in this population
Sijainti:avoin