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Andritz


Muyang



Editors desk

My editorial comes from my office at Harper Adams University in Shropshire, England this month where I am preparing for my third academic year at this prestigious institution.
My technical colleagues are busy here working on the construction of our new RAS systems for education and feed trial capabilities that will greatly reinforce our position to foster links with industry. Independent research is so important for academic credibility and rigour adding weight to investigations and potential publications. Fortunately, this is the avenue many companies pursue to enhance their reputation and to gain from academic insights into how their products may function and be applied in practice for superior performance.
The engineering of our RAS is complex and is dependent on sophisticated parts and components adding to costs and straining my budget. It reminds me of the expense associated with such ventures being advocated now for larger land based aquaculture operations but it’s all worth the effort to bring the aquaculture experience inland to a traditional agricultural university in a rural setting.
I am indebted to a local graduate originally from Sparsholt College also in the UK for his dedication to this project. Alex Miles is also undertaking his Masters project with me and is looking forward to his future duties in supporting the facility where he has proven expertise and skills. Although principally for salmonid fish we will be able to hold tilapia and carp in future with a view to extending this to other species.
However this has not prevented me from working with researchers overseas and leading to peer reviewed publications, my latest being a study on feed additives for sea bass.
One area of interest to me is a project on phosphorous (P) bioavailability in rainbow trout testing various P sources. In this work we examined trout growing in freshwater and subsequently the same fish after full seawater transfer. There were significant differences in absorption and retention in the first phase but very little differences in P sources that were all highly absorbed in seawater conditions after acclimation. Concomitant examination of the P gene transporter expression is in hand to better understand these findings. Phosphorus is a key element and important for many biochemical processes and especially in fish skeletal health as well as in numerous enzyme systems for energy utilisation and biosynthesis of macromolecules within tissues and organs.
With changing feed formulations and emphasis on plant by products such as soybean meals, it becomes an issue as we correct with dietary phosphorous to ensure that phytic bound P is not a limitation although exogenous enzymes as feed additives can greatly assist in this respect or pre-treatment of ingredients. The use of additional P is costly as well as an environmental issue and so better forms of commercial P is appropriate for use in aquaculture. Indeed global supplies of P for fertilisers and use in animal feeds will become an emerging concern unless we demonstrate more stewardship of this essential commodity. I hope to return to mineral and trace element requirements of fish and shrimp in a later issue.
In the current issue our species focus is on trout and we have a lovely feature on shrimp and fish oil in fish feed. Our technology features include a promising area of communication across fish farms in terms on using wifi to communicate, as well as a charming article on “Complex engineering in aquaculture".
 I am always keen to catch progress reports in our knowledge of aquatic animal nutrition, feed ingredient and additives sectors as well as the major compounders.
The next issue will be in the autumnal season and progressing towards 2018. There are many conferences to attend and so I hope to meet some of you again soon in more informal venues.
Enjoy the issue and keep your views and features coming into our offices in Cheltenham. Hilary Clinton is visiting this fine English town in October, but I have as yet not been approached for an interview. I happen to know she is a fan of aquaponics, and President Clinton has good knowledge of tilapia farming!

Professor Simon Davies

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International Aquafeed reflects a passion for aquafeed and excitement about new technology. Our objective is to be a respected provider of information about aquafeed in the widest sense.

Feed makes up around 70 percent of the cost of producing farmed fish. In each issue, we take an in-depth look at a wide range of technical issues associated with aquafeed production and use. We bring our readers global news about new technology and research, feed ingredients and micro-ingredients, market trends and all issues that impact on the aquafeed supply chain today and tomorrow.

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