Browsing Bergen Open Research Archive by Author "Rønnestad, Ivar"
Now showing items 41-50 of 50
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Reconstructed 3D models of digestive organs of developing Atlantic cod (Gadus morhua) larvae
Kamisaka, Yuko; Rønnestad, Ivar (Peer reviewed; Journal article, 2010)Six 3D models of the digestive system during ontogeny were reconstructed from histological sections of Atlantic cod larvae. The 3D models clearly visualize the following features: folding of the gut rotation; subdivision ... -
Regional Expression of npy mRNA Paralogs in the Brain of Atlantic Salmon (Salmo salar, L.) and Response to Fasting
Tolås, Ingvill; Kalananthan, Tharmini; Gomes, Ana S.; Lai, Floriana; Norland, Sissel; Murashita, Koji; Rønnestad, Ivar (Journal article; Peer reviewed, 2021-08-26)Neuropeptide Y (NPY) is known as a potent orexigenic signal in vertebrates, but its role in Atlantic salmon has not yet been fully established. In this study, we identified three npy paralogs, named npya1, npya2, and npyb, ... -
The role of dietary methionine concentrations on growth, metabolism and N-retention in cobia (Rachycentron canadum) at elevated water temperatures
Nguyen, Minh Van; Espe, Marit; Conceição, Louis E.C.; Le, Hoang Minh; Yúfera, Manuel; Engrola, Sofia A.D.; Jordal, Ann-Elise Olderbakk; Rønnestad, Ivar (Peer reviewed; Journal article, 2019-04)This study determined impacts of dietary methionine concentrations at two temperatures on growth, feeding efficiency and N‐metabolites in juvenile cobia. Methionine concentrations of the experimental diets were deficient ... -
Sequence analysis and spatiotemporal developmental distribution of the Cat-1-type transporter slc7a1a in zebrafish (Danio rerio)
Ellingsen, Ståle; Narawane, Shailesh; Fjose, Anders; Verri, Tiziano; Rønnestad, Ivar (Journal article; Peer reviewed, 2020)Cationic amino acid transporter 1 (Cat-1 alias Slc7a1) is a Na+-independent carrier system involved in transport and absorption of the cationic amino acids lysine, arginine, histidine, and ornithine and has also been shown ... -
Statistical modelling of voluntary feed intake in individual Atlantic salmon (Salmo salar L.)
Da Silva Gomes, Ana Cristina; Zimmermann, Fabian; Hevrøy, Ernst Morten; Søyland, Marcus; Hansen, Tom; Nilsen, Tom Ole; Rønnestad, Ivar (Journal article, 2023)Precision feeding aims to provide the correct amount of feed to farmed animals for optimal growth and performance and to avoid feed waste. However, knowledge underlying the meal-to-meal variability in voluntary feed intake ... -
The stress response in Atlantic salmon (Salmo salar L.): identification and functional characterization of the corticotropin-releasing factor (crf) paralogs
Lai, Floriana; Royan, Muhammad Rahmad; Gomes, Ana S.; Espe, Marit; Aksnes, Anders; Norberg, Birgitta; Gelebart, Virginie; Rønnestad, Ivar (Journal article; Peer reviewed, 2021)Corticotropin-Releasing Factor (CRF) is one of the main mediators of the Hypothalamic-Pituitary–Interrenal (HPI) axis to stress response. In Atlantic salmon, a comparative understanding of the crf1 paralogs role in the ... -
Taurine Supplementation to Plant-Based Diets Improves Lipid Metabolism in Senegalese Sole
Aragão, Cláudia; Teodósio, Rita; Colen, Rita; Richard, Nadège; Rønnestad, Ivar; Dias, Jorge; Conceição, Luís E. C.; Ribeiro, Laura (Journal article; Peer reviewed, 2023)Taurine is a sulphur-containing amino acid with important physiological roles and a key compound for the synthesis of bile salts, which are essential for the emulsion and absorption of dietary lipids. This study aimed to ... -
The teleost fish PepT1-type peptide transporters and their relationships with neutral and charged substrates
Vacca, Francesca; Gomes, Ana S.; De Gennaro, Marco; Rønnestad, Ivar; Bossi, Elena; Verri, Tiziano (Journal article; Peer reviewed, 2023)In teleosts, two PepT1-type (Slc15a1) transporters, i.e., PepT1a and PepT1b, are expressed at the intestinal level. They translocate charged di/tripeptides with different efficiency, which depends on the position of the ... -
The two-step development of a duplex retina involves distinct events of cone and rod neurogenesis and differentiation
Valen, Ragnhild; Eilertsen, Mariann; Edvardsen, Rolf; Furmanek, Tomasz; Rønnestad, Ivar; van der Meeren, Terje; Karlsen, Ørjan; Nilsen, Tom Ole; Helvik, Jon Vidar (Peer reviewed; Journal article, 2016-08)Unlike in mammals, persistent postembryonic retinal growth is a characteristic feature of fish, which includes major remodeling events that affect all cell types including photoreceptors. Consequently, visual capabilities ... -
The zebrafish cationic amino acid transporter/glycoprotein-associated family: sequence and spatiotemporal distribution during development of the transport system b 0,+ (slc3a1/slc7a9)
Ellingsen, Ståle; Narawane, Shailesh; Fjose, Anders; Verri, Tiziano; Rønnestad, Ivar (Journal article; Peer reviewed, 2021)System b0,+ absorbs lysine, arginine, ornithine, and cystine, as well as some (large) neutral amino acids in the mammalian kidney and intestine. It is a heteromeric amino acid transporter made of the heavy subunit SLC3A1/rBAT ...