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New study shows potential future of aquaculture feed

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ith both fish meal and fish oil suffering from price issues, along with concerns over sustainability, a new study has been received which could save the future of aquaculture. The study shows that the amount of fish meal can be reduced, if krill meal is added to feed, with growth performance actually improving. Conducted at the Institute of Sustainable Aquaculture and Marine Ecosystems (ECOAQUA), Universidad de Las Palmas de Gran Canaria, Spain, and focusing on gilthead seabream juveniles, the 12-week trial evaluated the growth of fish, when split into groups and fed a diet including 3 percent, 6 percent or 9 percent krill meal. Directed by researchers from the Aquaculture Research Group (GIA) and Aker BioMarine, triplicate groups of fingerlings were randomly distributed in six experimental tanks, at a density of 55 fish per tank. Fed manually one of the diets, three times a day, for 12 weeks, feed intake was calculated by recording uptake every day, as well as the number of uneaten pellets at each feeding point. There were no significant differences in feed intake between the control group and those fed krill meal during the trial, and survival was high in all groups, around 97 percent. Results showed that the juveniles fed the 9 percent krill meal diet had significantly higher body weight (32.76g), compared with fish fed the control diet (30.30g). This is due to krill meal’s unique profile. Protein rich with strong

palatability effect and naturally containing astaxanthin and chitin, it also has an excellent lipid and mineral profile. Enhanced production of high quality and healthy fry is of course a key driver for the successful expansion of the aquaculture industry. Developing a better understanding of the mechanisms that control early development and muscle growth is therefore critical, as it enables the key periods during development that introduce growth variation to be identified. Armed with such knowledge, growth can be maximised and the incidence of developmental disorders that have a negative impact on product quality can be greatly reduced. Offering a glimpse into the potential future of aquaculture feed, whereby fish meal can be reduced and replaced by alternative plant proteins, supplemented with krill meal, the study is an important step forward for diet and growth performance research. Yemmak imaj ilanı (Global Experience)-baskı AQUAFEED.pdf

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International Aquafeed - December 2018 | 9

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DEC 2018 - International Aquafeed magazine  

DEC 2018 - International Aquafeed magazine