Browsing Bergen Open Research Archive by Author "Hangstad, Thor Arne"
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Comparison of diet composition, feeding, growth and health of lumpfish (Cyclopterus lumpus L.) fed either feed blocks or pelleted commercial feed
Imsland, Albert; Reynolds, Patrick; Jonassen, Thor Magne; Hangstad, Thor Arne; Adron, John; Elvegård, Tor Anders; Urskog, Tonje Cecilie; Hanssen, Anna; Mikalsen, Bjørn (Peer reviewed; Journal article, 2019)Two duplicate groups of individually tagged lumpfish (mean initial weight: 21.5 ± 3.2 g) were fed either a commercially available lumpfish feed or feed blocks for a period of 123 days. The aim was to evaluate and compare ... -
Comparison of diet composition, feeding, growth and health of lumpfish (Cyclopterus lumpus L.) fed either feed blocks or pelleted commercial feed
Imsland, Albert; Reynolds, Patrick; Jonassen, Thor Magne; Hangstad, Thor Arne; Adron, John; Elvegård, Tor Anders; Urskog, Tonje Cecilie; Hanssen, Anna; Mikalsen, Bjørn (Peer reviewed; Journal article, 2019)Two duplicate groups of individually tagged lumpfish (mean initial weight: 21.5 ± 3.2 g) were fed either a commercially available lumpfish feed or feed blocks for a period of 123 days. The aim was to evaluate and compare ... -
The effects of cryogenically preserved sperm on the fertilization, embryonic development and hatching success of lumpfish C. lumpus
Imsland, Albert; Purvis, Emily; Reinardy, Helena; Kapari, Lauri Teemu; Watts, Ellie Jane; Hangstad, Thor Arne (Journal article; Peer reviewed, 2022)Lumpfish (C. lumpus) are used as cleaner fish in the Atlantic salmon (Salmo salar) farming industry to remove parasitic sea lice. At present, wild lumpfish broodstock are used which puts strain on wild populations. By ... -
Effects of different feeding frequencies on growth, cataract development and histopathology of lumpfish (Cyclopterus lumpus L.)
Imsland, Albert; Reynolds, Patrick; Jonassen, Thor Magne; Hangstad, Thor Arne; Elvegård, Tor Anders; Urskog, Tonje Cecilie; Hanssen, Anna; Mikalsen, Bjørn (Peer reviewed; Journal article, 2019)Three duplicate groups of individually tagged lumpfish (mean initial weight: 22.3 ± 2.5 g) were fed either daily (7DW); four days per week (4DW) or three days per week (3DW) at a feeding rate of 2% body weight day−1 for a ... -
Genomic Signatures of Local Adaptation under High Gene Flow in Lumpfish—Implications for Broodstock Provenance Sourcing and Larval Production
Maduna, Simo; Jónsdóttir, Ólöf Dóra Bartels; Imsland, Albert; Gíslason, Davíð; Reynolds, Patrick; Kapari, Lauri Teemu; Hangstad, Thor Arne; Meier, Kristian; Hagen, Snorre (Journal article; Peer reviewed, 2023-09-26)Aquaculture of the lumpfish (Cyclopterus lumpus L.) has become a large, lucrative industry owing to the escalating demand for “cleaner fish” to minimise sea lice infestations in Atlantic salmon mariculture farms. We used ... -
Quantification of grazing efficacy, growth and health score of different lumpfish (Cyclopterus lumpus L.) families: possible size and gender effects
Imsland, Albert; Reynolds, Patrick; Hangstad, Thor Arne; Kapari, Lauri Teemu; Maduna, Simo; Hagen, Snorre B.; Jónsdóttir, Ólöf Dóra Bartels; Spetland, Frank; Lindberg, Ken Ståle (Journal article; Peer reviewed, 2021)To investigate the possible family influence on sea lice grazing of lumpfish on Atlantic salmon, ten families of lumpfish (N = 480) with a mean (± SD) weight of 54.8 ± 9.2 g were distributed among ten sea cages (5 × 5 × 5 ... -
Temperature and size-dependency of lumpfish (Cyclopterus lumpus) oxygen requirement and tolerance
Remen, Mette; Nes, Armand Moe; Hangstad, Thor Arne; Geraudie, Perrine; Reynolds, Patrick; Urskog, Tonje Cecilie; Hanssen, Anna; Stefansson, Sigurd Olav; Imsland, Albert (Journal article; Peer reviewed, 2022)Lumpfish are currently produced and utilized as cleaner fish, to control sea lice infestation rates in salmon net pens, but information on environmental requirements is still limited. This study aimed to determine the zone ... -
The use of photoperiods to provide year round spawning in lumpfish Cyclopterus lumpus
Imsland, Albert; Hangstad, Thor Arne; Jonassen, Thor Magne; Stefansson, Sigurd Olav; Nilsen, Tom Ole; Hovgaard, Peter; Elvegård, Tor Anders; Lindberg, Ken Ståle; Mikalsen, Bjørn; Urskog, Tonje Cecilie; Norberg, Birgitta; Andersson, Eva; Spetland, Frank; Reynolds, Patrick (Peer reviewed; Journal article, 2019)In order to provide year round spawning broodstock, lumpfish (initial size 746 g and 24.9 cm) were reared under four different photoperiod regimes from January 2017 to July 2018. One group was reared under simulated natural ...