Thursday, August 1, 2013

01/08/13: Sustainable prawn feed; Florida considers more oyster farms; spherical cage company plans to expand

Australia's national science agency, CSIRO, has developed a new prawn feed which it claims will help in the quest for sustainable seafood.

After a decade of research, the CSIRO scientists have perfected the Novacq™ prawn feed additive. Farmed prawns fed with Novacq grow on average 30 percent faster, are healthier and can be produced with no fish products in their diet, a world-first achievement in sustainability, according to CSIRO.  

CSIRO's Dr Nigel Preston has been working with the A$75 million Australian prawn farming industry for over 25 years, and says this is a game changer for the industry.

"We fed Novacq to black tiger prawns, and it made them even better for consumers, the environment and prawn farmers," Dr Preston said. 

"This is a major achievement for the sustainability of Australia's aquaculture industry as prawns fed this diet are not only a top quality product and reach market size faster, they also no longer need to be fed with any products from wild fishery resources." 

"This means that Australian prawn aquaculture, already a world leader in sustainability and environmental management, is now set to become even better, and really solidifies aquaculture as a sustainable source of protein to help meet the ever growing demand for food."

Until now, Australian prawn farmers have needed to feed their prawns with a pellet that includes some sustainably sourced fish meal or fish oil, in order to ensure that the prawns grew fast, and were a healthy and high quality product for consumers.

"When we are talking about relieving pressure on our ocean stocks of fish, every little bit helps. Novacq will mean that the Australian prawn farming industry could potentially no longer be reliant on wild-caught fishery products," Dr Preston said.

An area of Florida, USA which was originally granted aquaculture licences in the 1980s may see finally aquaculture come to the area.

Officials are discussing the possibility of reactivating four aquaculture use zones (AUZ) for licenses for oyster farming in the Apalachicola Bay area.

The AUZs are part of a previously planned, but subsequently abandoned, aquaculture leasing project in the aftermath of Hurricane Elena.

However, according to local press, cabinet members are taking a cautious approach so the AUZs are not a forgone conclusion.

Innovative cage firm, Hawaii Oceanic Technology, USA, is aiming to expand its open ocean farming business.

The firm has already received a patent for its spherical cages from Canada but is looking to expand into Japan, Australia and the EU.

The Oceansphere system is an automated positioning and submersible open ocean platform that can grow yellow fin tuna and other pelagic species in an efficient and sustainable manner. 
The Big Prawn, Ballina, NSW.
The Big Prawn, Ballina, NSW. (Photo credit: Wikipedia)

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New! IAF article: Probiotics in pangasius

The second article of our probiotics focus discusses the effect of Sangrovit® on the performances of tra catfish (Pangasius hypophthalmus) cultured in earthen ponds.

Dr Nguyen Nhu Tri and Prof Le Thanh Hung, Nong Lam University,Vietnam are our guides

Tra catfish (Pangasius hypophthalmus) is a dominant cultured species in Vietnam in terms of production. Its aquaculture production in 2011 was approximate 1.2 million metric tons. The main culture system for tra catfish is intensive model in earthen ponds with very high density and yield. In this model, feed cost comprises the main part of production cost.

This item is being increased recently, leading to a reduction of profit for farmers. In order to improve the profit of tra catfish farming, feed cost should be reduced. One of the measures to reduce feed cost is through feed additives which improve nutrient absorption and utilization.

Sangrovit® is an all-natural feed additive that has been utilized in many animal species. The main active ingredients of Sangrovit® include bitter constituents, which help to enhance the absorption of feed and promote digestion. The special active substances included in Sangrovit®, belonging to the group of Benzophenanthridine and Protopine Alkaloids, have the additional effects of improving hormonal and chemostatic regulating mechanisms in feed uptake, nutrient absorption and availability. Therefore, it is feasible to utilize its characteristics in tra catfish intensive culture system in Vietnam.

Click to read the full article (which starts on page 9).

FOCUS - Probiotics

Click to read the full magazine.
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