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Features in this issue include:
- Pea Seed protein concentrate in Tilapia feeds
- Catfish production in India: Present status and prospects
- Growth trial and challenge testing facility opens in Thailand
- Algae’s key role in taking care of consumer expectations
- Duckweed: A sustainable protein supplement for the future
- Microalgae: Different types of algae provide vital nutrients to rotifers, copepods and larvae of finfish, shellfish and shrimp
- EXPERT TOPIC: Krill
- Fish Farming Technology supplement - Wavemaster AC850 Panorama
The season is certainly changing rapidly and autumnal weather is upon us here in the UK with much rain and threatening grey skies rolling in from the Atlantic. The nights are certainly drawing in and it’s now time for some of us in the UK to stock up and close the hatches.
Plymouth, England is subject to typical ever changing maritime weather and it makes for interesting challenges. As a Welshman though, I am quite used to rain and storms whether they be climatic or even political (especially in academia), and we usually find a song or a pub for solace and a place to think with a drink!
It is only a step away from Christmas and reminders of the festive holidays are already in the shops with advertisements for food, drinks and all manner of decorations. I can’t wait!!
Increasingly salmon is now presented along with the traditional turkey and other delights and the consumer has so much choice at hand in terms of products with various types of presentation from whole fresh salmon, fillets, smoked forms, pates and salmon encased in pastry, bread crumbs and in fish pies and salmon fish cakes etc.
Aquaculture of course is at the core of production and one forgets that it is central to the supply chain of fresh salmon or chilled salmon products in our stores and supermarkets. Retailers are able to set specification requirements for fish at source and are important in their discerning of quality criteria and expectations from the consumer for a good reliable and nutritious product. As such, there is now increasing demand for salmon and with it a need for bespoken fish feed to support the growth of salmon, promote excellent health in relation to welfare and of course guarantee that the fish supplies the Omega-3 fatty acids (or oils, fats for public perception) for human health and well-being. Fish oils and fish meals are a finite resource and we must use them very strategically as fish farming of carnivorous and especially marine species expands globally.
The medical research fraternity advocating that we should ideally consume 1-3 portions per week of salmon for optimum cardiovascular function, improved cognition, brain health and prevention of strokes is well known and is mentioned frequently in the TV media and press. However there has been much concern that the replacement of marine derived, principally fish oils and fish meals in diets for salmon and other fish species too has caused a slow trend that could lower in some instances the Omega- 3 ratio to other fatty acids (Omega-6 series) in the diet and hence in fish such as salmon to a worrying threshold. This is not the absolute case as yet but significant differences in the Omega-3 levels do exist and certainly between wild Pacific salmon and wild/ farmed Atlantic salmon. One of the criticisms of the latter is their typically very high fat content and this is not appealing to some people with some adverse comments against the farming of salmon. However many have not even tasted the rather drier wild salmon, so it’s a matter of perception and taste.
There is now a major new initiative launched by the Global Salmon Initiative (GSI) to encourage the development of novel Omega-3 alternatives to marine oil sources in attaining the sustainable agenda for salmon production and yet also satisfy the demands by the industry for Omega-3 enriched fish.
It is stated by GSI that ‘the farmed salmon industry uses approximately 350000 tons of fish oil each year, and this demand is expected to grow by approximately five percent each year in line with industry growth’.
This challenge is already being met by several biotechnology companies and a few scientific papers are now available demonstrating the feasibility of plants, algae and yeast as sources of EPA and DHA Omega-3’s that can effectively be retained to enhance the salmon flesh levels at harvest. The call is for companies to provide a significant increase in availability of such materials over a specified time period of at least two years. This I think will be a most exciting course of action and I believe will open new opportunities for discovery, innovation and enterprise in aquaculture. It will be one of those decisive markers affecting costs, competitiveness and overall success of an industry so crucial to Scotland, Norway, Chile, Iceland, and beyond.
Now in this issue of IAF we have our special expert feature focusing on Krill and as a growth accelerator with its numerous nutritional attributes especially those Omega-3’s and the powerful anti-oxidant astaxanthin well known for its flesh colouring properties for salmonid fish.
My colleague Dr Ingrid Luputsch in her new role at AB-Agri reports on the use of pea seed protein concentrate in experimental diets for tilapia, something I have worked on over the years with Professor Antonio Gouveia in Portugal for many fish species and with robust outcomes for inclusion in fish feeds.
Our special fish interest in this issue is catfish of the Asian variety (There is much potential in Claridi spp., and its excellent eating too, we worked for over a decade on this tropical species when I was based at Plymouth University, and bred several thousand in the heart of the city!) The article by Dr B. Laxmappa, Fisheries Development Officer, Department of Fisheries, Telangana, India discusses Ictalurus Silurus, pangasius and Clarias gariepinus species generically called catfish in relation to their production and contribution to freshwater aquaculture in India.
In some forms of aquaculture, aquatic vegetation makes a valuable feed contribution to less intensive types of production systems and so duckweed is discussed in a technical/ scientific report. However its processing can generate an invaluable high protein concentrate for fish, terrestrial farm animal nutrition and for human nutrition applications making duckweed an added value product of significant potential.
We certainly need more trained aquaculture fish health specialists and I am pleased that we include news of the opening of the new Fish Vet Asia laboratories at. Chonburi, 90 minutes south-east of Bangkok.
Finally our events section addresses Aquanor and previewing the EAS & Aquaculture Europe meeting for October.
There is a diversity of news items and regular column writers and so I wish you good reading and a busy and successful autumn in your business endeavours.
Professor Simon Davies
To view the issue in full, please click here
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.
We have a deep commitment to our readers and our advertisers. We believe in quality information and quality design, just as you believe in the quality of your products.
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Editorial in our next issue
IAF September - October 2015
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