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Born to be wild: effects of rearing density and environmental enrichment on stress, welfare, and smolt migration in hatchery-reared Atlantic salmon

Artikel i vetenskaplig tidskrift
Författare Malin Rosengren
E Kvingedal
Joacim Näslund
Jörgen I Johnsson
Kristina Sundell
Publicerad i Canadian Journal of Fisheries and Aquatic Sciences
Volym 74
Nummer/häfte 3
Sidor 396-405
ISSN 0706-652X
Publiceringsår 2017
Publicerad vid Institutionen för biologi och miljövetenskap
Sidor 396-405
Språk en
Länkar doi.org/10.1139/cjfas-2015-0515
Ämnesord Fiske , Biologi
Ämneskategorier Biologiska vetenskaper

Sammanfattning

Hatchery-reared salmonids released into the wild generally have poor survivability compared with wild conspecifics. To assess potential hatchery rearing improvements, behavioral and physiological effects of reducing animal density and adding in-tank shelter were investigated. Atlantic salmon (Salmo salar) parr were placed in barren or shelter-enriched tanks at high or low density up until release as smolts. Lowered density rendered positive effects on growth and intestinal barrier function, and both lowered density and shelter decreased conspecific aggression, as inferred by fin damage. Furthermore, while the presence of shelter decreased stress hormone levels following human disturbance, it also decreased growth and smolt migration success, an effect particularly pronounced at high densities. Therefore, we suggest that this type of structural enrichment should be avoided for Atlantic salmon smolts held at high densities and conclude that a lowered animal density with or without shelter has the highest potential in producing a more resilient smolt for stocking.

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