{"componentChunkName":"component---src-templates-project-js","path":"/projects/salinity-influence-on-smolt-development-and-post-smolt-performance-in-rainbow-trout-oncorhynchus-mykiss/","result":{"data":{"projects":{"description":"Rainbow trout aquaculture is growing rapidly, as is the body of research that supports this \nindustry. However, there remains a need for better understanding the fundamentals of the \nsmoltification process. This thesis examines the effect of two different brackish water \ntreatments on smoltification in addition to standard smoltification in freshwater of rainbow trout \n(Oncorhynchus mykiss). The project includes two experiments: 1. Smolt development and \nperformance during salinity treatment 2. Seawater response and performance after \nsmoltification during salinity treatment. Smolt development and seawater response was\ncharacterized using gill mRNA transcription (nkaα1a, nkaα1b and nkcc1a), gill Na+\n/K+\n-\nATPase activity and plasma ion concentration (Cl- and Na+\n). Moreover, growth of the different \nsalinity treatments and after seawater transfer was recorded. Rainbow trout were exposed to a \nwater salinity of approximately 1 ‰ (freshwater control group), 4 ‰ and 15 ‰ in the course \nof smoltification. Salinity induced an earlier smolt development by activating a rapid change in \nthe mRNA transcription of the α-isoforms nkaα1a (freshwater isoform) and nkaα1b (seawater \nisoform), which, in turn, induced an earlier peak of the Na+\n/K+\n-ATPase (NKA) activity. Salinity \nhad no effect on growth during smoltification. Rainbow trout transferred during the preparatory\nsmoltification phase differed from the rainbow trout transferred after the completion of\nsmoltification. This early transfer induced an upregulated mRNA transcription of the seawater \nα-isoform nkaα1b and the co-transporter nkcc1a after seawater entry. It also induced an increase \nin the specific growth rate (SGR) of weight. No major differences were observed among \ntreatment groups, suggesting that timing of seawater transfer is more important than salinity rearing conditions. ","category":"Master Thesis","title":"Salinity influence on smolt development and post-smolt  performance in Rainbow trout (Oncorhynchus mykiss)","coverUrl":"https://drive.google.com/thumbnail?id=1WUI3rbduyqwkSVMnCOeM1SET2_dIEcVj","fileUrl":"https://drive.google.com/uc?export=download&id=1LNAB0xJIKShHO6mrjko4sHKVg9pSG85B","slug":"salinity-influence-on-smolt-development-and-post-smolt-performance-in-rainbow-trout-oncorhynchus-mykiss","projectPerson":null,"author":"Håkon Fagerbakke Kvittingen","organizations":["UiB"," NORCE and Lerøy"],"tags":["Aquaculture"," Land Based"," Physiology"," smolt"," Rainbow trout"," Smoltification"],"start":"August 2017","end":"June 2019"},"projectImage":{"childImageSharp":{"fluid":{"base64":"data:image/png;base64,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","aspectRatio":1.6666666666666667,"src":"/static/0f5082d22dd548f2e5aaf24fdae2d261/46604/project.png","srcSet":"/static/0f5082d22dd548f2e5aaf24fdae2d261/69585/project.png 200w,\n/static/0f5082d22dd548f2e5aaf24fdae2d261/497c6/project.png 400w,\n/static/0f5082d22dd548f2e5aaf24fdae2d261/46604/project.png 500w","sizes":"(max-width: 500px) 100vw, 500px"}}}},"pageContext":{"itemId":"1b9b0470-358d-53f8-b57b-fcdfeb649c01"}}}