Blar i Brage IMR på forfatter "Rønnestad, Ivar"
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1H NMR metabolic profiling of cod (Gadus morhua) larvae: potential effects of temperature and diet composition during early developmental stages
Chauton, Matilde Skogen; Galloway, Trine Falck; Kjørsvik, Elin; Størseth, Trond Røvik; Puvanendran, Velmurugu; van der Meeren, Terje; Karlsen, Ørjan; Rønnestad, Ivar; Hamre, Kristin (Journal article; Peer reviewed, 2015-11-06)Marine aquaculture offers a great source of protein for the increasing human population, and farming of, for example, Atlantic salmon is a global industry. Atlantic cod farming however, is an example of a promising industry ... -
Amino Acid Carriers of the Solute Carrier Families 7 (SLC7) and 38 (SLC38) Are Involved in Leucine Sensing in the Brain of Atlantic Salmon (Salmo salar)
Comesaña, Sara; Lai, Floriana; Jordal, Ann-Elise Olderbakk; Verri, Tiziano; Espe, Marit; Soengas, José L.; Rønnestad, Ivar (Peer reviewed; Journal article, 2021)Sensing of amino acids in fish brain, especially branched-chain amino acids (BCAA) like leucine, is involved in regulation of feed intake through different mechanisms. However, there is limited information regarding the ... -
Anorectic role of high dietary leucine in farmed Atlantic salmon (Salmo salar L.): Effects on feed intake, growth, amino acid transporters and appetite-control neuropeptides.
Lai, Floriana; Comesaña, Sara; Gomes, Ana S.; Flatejord, Daniel; Tolås, Ingvill; Espe, Marit; De Santis, Christian; Hartviksen, Mali B.; Verri, Tiziano; Soengas, Jose L.; Rønnestad, Ivar (Peer reviewed; Journal article, 2023)Leucine has been identified to modulate feed intake and energy homeostasis in fish as in other vertebrates. Under allostatic conditions, energy expenditure may change, and adjustments to the processes that govern the energy ... -
Characterisation of two vitellogenins in the salmon louse Lepeophtheirus salmonis: molecular, functional and evolutional analysis
Dalvin, Sussie Trine; Frost, Petter; Loeffen, Peter; Skern-Mauritzen, Rasmus; Baban, Jamil; Rønnestad, Ivar; Nilsen, Frank (Journal article; Peer reviewed, 2011-05-09)The salmon louse Lepeophtheirus salmonis Krøyer affects a variety of wild salmonoid hosts, but is also an important pest in aquaculture, which is a globally important and rapidly growing industry. Salmon lice have large ... -
Choline supplementation increased total body lipid gain, while surplus methionine improved growth and amino acid retention in adult Atlantic salmon (Salmo salar)
Espe, Marit; Andersen, Synne Marte; Veiseth-Kent, Eva; Rønnestad, Ivar; Holen, Elisabeth; Zerrahn, Jens-Erik; Aksnes, Anders (Peer reviewed; Journal article, 2017)Methionine–choline-deficient (MCD) mammals are known to accumulate liver TAG probably due to phosphatidylcholine (PC) deficiency and thus assembly of VLDL and transport of lipids from liver to peripheral organs. To assess ... -
Copepods enhance nutritional status, growth and development in Atlantic cod (Gadus morhua L.) larvae – can we identify the underlying factors?
Karlsen, Ørjan; van der Meeren, Terje; Rønnestad, Ivar; Mangor-Jensen, Anders; Galloway, Trine Falck; Kjørsvik, Elin; Hamre, Kristin (Journal article; Peer reviewed, 2015-05-19)The current commercial production protocols for Atlantic cod depend on enriched rotifers and Artemia during first-feeding, but development and growth remain inferior to fish fed natural zooplankton. Two experiments were ... -
Developmental stages of the ballan wrasse from first feeding through metamorphosis: Cranial ossification and the digestive system
Norland, Sissel; Sæle, Øystein; Rønnestad, Ivar (Peer reviewed; Journal article, 2022)We have described six developmental stages for the ballan wrasse, from the first feeding until the juvenile stage, supported by specific descriptions of cranial ossification, maturation of the digestive tract, and ... -
Diet affects the redox system in developing Atlantic cod(Gadus morhua) larvae
Penglase, Samuel; Edvardsen, Rolf; Furmanek, Tomasz; Rønnestad, Ivar; Karlsen, Ørjan; van der Meeren, Terje; Hamre, Kristin (Journal article; Peer reviewed, 2015-06-12)The growth and development of marine fish larvae fed copepods is superior to those fed rotifers, but the underlying molecular reasons for this are unclear. In the following study we compared the effects of such diets on ... -
Does the thermal component of warm water treatment inflict acute lesions on Atlantic salmon (Salmo salar)?
Moltumyr, Lene; Gismervik, Kristine; Gu, Jinni; Gåsnes, Siri Kristine; Kristiansen, Tore S; Rønnestad, Ivar; Nilsson, Jonatan; Stien, Lars Helge (Peer reviewed; Journal article, 2020)Warm water treatment, i.e. exposure to sea water at a temperature of 28–34 °C for 20–30 s, has in recent years been widely used for delousing of Atlantic salmon (Salmo salar) and rainbow trout (Oncorhynchus mykiss) in ... -
Effect of diet on molecular relationships between Atlantic cod larval muscle growth dynamics, metabolism, and antioxidant defense system
Vo, Tu Anh; Galloway, Trina Falck; Arukwe, Augustine; Edvardsen, Rolf Brudvik; Hamre, Kristin; Karlsen, Ørjan; Rønnestad, Ivar; Kjørsvik, Elin (Peer reviewed; Journal article, 2022)We studied molecular effects (RNAseq and qPCR) of first feeding prey types (copepods or rotifers/Artemia) on skeletal muscle myogenesis and growth dynamics (proliferation, differentiation), metabolism (glycolysis, ... -
Effect of increased rearing temperature on digestive function in cobia early juvenile
Yufera, Manuel; Nguyen, MV; Navarro-Guillén, Carmen; Moyano, Francisco Javier; Jordal, Ann-Elise Olderbakk; Espe, Marit; Conceicao, LEC; Engrola, Sofia; Le, MH; Rønnestad, Ivar (Journal article; Peer reviewed, 2019)The present study is focused to elucidate the main characteristics of the digestive function of this carnivorous fast-growing fish living at high temperatures. With this aim, we have examined the effects of an increased ... -
Effects of cholecystokinin (CCK) on gut motility in the stomachless fish ballan wrasse (Labrus bergylta)
Le, Hoang Thi My Dung; Lie, Kai Kristoffer; Giroud-Argoud, Justine; Rønnestad, Ivar; Sæle, Øystein (Journal article; Peer reviewed, 2019)Cholecystokinin (CCK) is well-known as a key hormone that inhibits stomach emptying and stimulates midgut motility in gastric species. However, the function of CCK related to gut motility in agastric fish, especially in ... -
Elevated sea temperature combined with dietary methionine levels affect feed intake and appetite-related neuropeptide expression in the brains of juvenile cobia (Rachycentron canadum)
Nguyen, Minh; Pham, Phuong Linh; Jordal, Ann-Elise Olderbakk; Espe, Marit; Conceição, L.E.C.; Yúfera, M.; Engrola, S.; Le, M.H.; Rønnestad, Ivar (Peer reviewed; Journal article, 2023)This study aimed to determine the impact of elevated temperature combined with different levels of dietary methionine concentrations on feed intake (FI) and brain expression of selected neuropeptides and one receptor ... -
Fuel and metabolic scaling during the early life stages of Atlantic cod Gadus morhua
Finn, Roderick Nigel; Rønnestad, Ivar; van der Meeren, Terje; Fyhn, Hans Jørgen (Journal article; Peer reviewed, 2002-11-13)The simultaneous effect of temperature (5, 7, 10 and 13degreesC) and light on the rates of oxygen consumption and ammonia excretion of larval and early juvenile Atlantic cod Gadus morhua was examined. Larvae increased their ... -
Hypothalamic agrp and pomc mRNA Responses to Gastrointestinal Fullness and Fasting in Atlantic Salmon (Salmo salar, L.)
Kalananthan, Tharmini; Murashita, Koji; Rønnestad, Ivar; Ishigaki, Mitsumasa; Takahashi, Kota; Silva, Marta Sofia; Wakabayashi, Yuki; Lai, Floriana; Shimizu, Munetaka; Nilsen, Tom Ole; Martinez, Enrique Pino; Gomes, Ana S. (Peer reviewed; Journal article, 2020)The orexigenic agouti-related protein (AgRP) and the anorexigenic pro-opiomelanocortin (POMC) are crucial players in the control of feed intake in vertebrates, yet their role in teleosts has not been fully established. ... -
Impact of long-term fasting on the stomach-hypothalamus appetite regulating genes in Atlantic salmon postsmolts
Kalananthan, Tharmini; Folkedal, Ole; Gomes, Ana S.; Lai, Floriana; Handeland, Sigurd Olav; Tolås, Ingvill; Gelebart, Virginie; Rønnestad, Ivar (Peer reviewed; Journal article, 2023)Atlantic salmon will experience periods of fasting during its lifecycle. In nature, prolonged fasting periods occur owing to seasonal fluctuations in available feeds, migration or in relation to reproduction. In a culture ... -
Leucine did not stimulate growth and accretion in either stressed or unstressed Atlantic salmon
Espe, Marit; Lai, Floriana; Gomes, Ana S.; De Santis, Christian; Hartviksen, Mali B.; Holen, Elisabeth; Rønnestad, Ivar (Peer reviewed; Journal article, 2021)The aim of the current trial was to test whether leucine affected growth and accretion including test any effects on leucine upon stress. Quadruplicate tanks each containing 50 Atlantic salmon (Salmo salar) (mean start ... -
Long-term welfare effects of repeated warm water treatments on Atlantic salmon (Salmo salar)
Moltumyr, Lene; Nilsson, Jonatan; Madaro, Angelico; Seternes, Tore; Winger, Fredrik Agerup; Rønnestad, Ivar; Stien, Lars Helge (Peer reviewed; Journal article, 2021)Warm water treatment has in recent years become widely used for ridding salmonids of sea lice in aquaculture although the consequences of the treatment for fish welfare are not adequately investigated. The objective of ... -
Loss of stomach, loss of appetite? Sequencing of the ballan wrasse (Labrus bergylta) genome and intestinal transcriptomic profiling illuminate the evolution of loss of stomach function in fish
Lie, Kai Kristoffer; Tørresen, Ole K.; Solbakken, Monica Hongrø; Rønnestad, Ivar; Tooming-Klunderud, Ave; Nederbragt, Alexander Johan; Jentoft, Sissel; Sæle, Øystein (Journal article; Peer reviewed, 2018)The ballan wrasse (Labrus bergylta) belongs to a large teleost family containing more than 600 species showing several unique evolutionary traits such as lack of stomach and hermaphroditism. Agastric fish are found throughout ... -
Ossification of Atlantic cod (Gadus morhua) – Developmental stages revisited
Sæle, Øystein; Haugen, Trine; Karlsen, Ørjan; van der Meeren, Terje; Bæverfjord, Grete; Hamre, Kristin; Rønnestad, Ivar; Moren, Mari; Lie, Kai Kristoffer (Peer reviewed; Journal article, 2017)In studies of marine larvae, it is common to use days post-hatch as a developmental reference point. We show that age is a poor measure of morphological and physiological development in Atlantic cod. Therefore, we propose ...