{"componentChunkName":"component---src-templates-project-js","path":"/projects/growth-performance-and-welfare-of-post-smolt-salmo-salar-l-reared-in-semi-closed-containment-systems-s-ccs-a-comparative-study/","result":{"data":{"projects":{"description":"The salmon industry faces challenges related to sea lice infestations, escapees, diseases\nand environmental impact. Semi closed containment systems (S-CCS) have been proposed to\nabate these challenges. In the S-CCS, cultured fish are separated from the natural environment\nby a physical barrier. The use of these systems reduces the time fish spend living in open sea\ncages.\nThis study investigated and documented welfare and growth performance of Atlantic\nsalmon through an acute challenge test experiment and a big-scale benchmark study.\nThe acute challenge test experiment was conducted using post-smolts raised in two large\nscale semi-closed system (S-CCS: Preline and Neptune), with reference groups raised in open\nsea cages. The post-smolt was stressed by confining them in a holding tank with reduced water\nlevel for a short period. Corresponding baseline sampling was done on unstressed fish for\ncomparable measurements.\nFor the benchmark study, selected production data from six generations of salmon was\nused to compare growth and performance of fish raised in S-CCS (Preline) and in open sea\ncages (reference). The benchmark study was carried out in two phases. Phase one used postsmolts from approximately 100 g to 800 g in seawater, and fish in S-CCS were compared with\na reference group from an open sea cage. The second, grow-out phase used salmon from\napproximately 800 g to 5000 g in open sea cages; here fish previously reared in S-CCS were\ncompared with fish from a reference group.\nFish raised in the S-CCS showed lower concentration of plasma cortisol, magnesium\nand lactic acid at baseline levels, giving a stronger response to the acute stress challenge than\nfish from the reference group. The results suggest lower basal stress in the S-CCS group\ncompared with the reference group in open sea cages, as well as a more balanced response to\nstress in the S-CCS fish.\nThe findings from the benchmark analyses showed a significantly lower infestation of\nsea lice in Preline fish during the post-smolt phase. Furthermore, in the grow-out phase the\nPreline group showed higher weight gain and final weight (4.654 kg in spring and 4.872 kg in\nfall) compared to the reference group (3.797 kg in spring and 4.030 kg in fall) in open pen.\nFinally, salmon raised in Preline showed significantly higher survival compared to the reference\ngroup, indicating increased robustness in fish raised in S-CCS when transferred to open net\npens in sea.\nAs the results indicate reduced stress, lower sea lice infestations and greater weight gain,\nS-CCS appears to have advantages compared to traditional long exposure to the natural\nenvironment in open sea cages in Norway. However, to determine the real potential of S-CCS\nstrategy, further research is needed.","category":"Master Thesis","title":"Growth performance and welfare of post-smolt (Salmo salar L.) reared in semi closed containment systems (S-CCS) – a comparative study","coverUrl":"https://drive.google.com/thumbnail?id=1iKuMXFxmVWg89O5SH1sAAeSt5PFNsaop","fileUrl":"https://drive.google.com/uc?export=download&id=1UqEnOWL6eWgj9OIxYtBDVSV03OFxxpO0","slug":"growth-performance-and-welfare-of-post-smolt-salmo-salar-l-reared-in-semi-closed-containment-systems-s-ccs-a-comparative-study","projectPerson":null,"author":"Tarald Kleppa Øvrebø","organizations":["UiB"," UiS"," Lerøy"," Mowi"," CtrlAqua"," Forskningsrådet"," Norce "],"tags":["Aquaculture"," Semi-closed system"," salmon"," smolt"],"start":"March 2019","end":"May 2020"},"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":"a01c826e-d19a-564f-ab3f-1af36414f28e"}}}