Recirc
Illegal fishing of one of Mexico’s best recognized fish, triggered in no small part by Chinese demand for maws (swim bladders), has sent the iconic totoaba to the edge of extinction in that region.

The Great American Aquaculture (GAA) company in Waterbury, Connecticut is finishing off initial development of what it claims will be one of the largest recirculating-saltwater aquaculture facilities in the northeast United States.

A group of private investors recently commissioned the Varvarynsky Fish Farming facility in Azerbaijan, reportedly the largest hatchery in the country, designed for rearing up to 50 million sturgeon fry per year.

The Canadian division of the world’s largest salmon producer will soon have spent more than $40 million to build seven recirculating aquaculture systems (RAS) at its land-based freshwater hatcheries near Sayward, British Columbia in western Canada.

The survival rate of walleye larvae in RAS increases when micro-diffusers and oil absorbent socks are used, according to a study by Laramée et al, Development of techniques to promote gas bladder inflation of walleye (Sander vitreus) larvae in intensive recirculating aquaculture system.

Recirculating aquaculture systems (RASs) are evolving towards even higher levels of water recycling and water efficiency. This was the message presented by Dr. Dallas Weaver from Scientific Hatcheries, Huntington Beach, California, at the Recirculating Aquaculture Conference held last August in Roanoke, Virginia.   Weaver and his colleagues Mark Francis and Jimmy Williamson from Aquaneering, Inc. San Diego, California; and Conal True from Universitad Autónomia de Baja California, Ensenada, Mexico, have designed, built, tested and installed a denitrification system geared to service multiple RAS systems while maintaining biosecurity between them.

You don’t have to be Einstein to realize that hatchery production underwrites aquaculture. Without reliable sources of seedstock, the supply chain of aquaculture products would have more gaps than a politician’s promise.

The snapping shrimp, aka pistol shrimp, can literally shoot its prey. Using a plunger on its enormous claw, it can shoot water at 70mph/115kpm. This water velocity creates a vacuum pressure pocket that takes gas out of solution, and expands it rapidly. The resulting explosion of gas bubble generates light, sound (210 dB), and shockwaves that can kill or stun its prey.

The development of a new salmon egg production facility in Norway has been unveiled by SalmoBreed and Salten Stamfisk, committing the two companies to the joint-venture creation of a 100 million ova-a-year unit, set for first-phase completion by autumn 2017.

The Norwegian firm of Niri recently announced the establishment of a large land-based salmon RAS in Scotland.

With many farms moving the vital components of their production indoors the cost of power is becoming a major issue. Situated 250km southwest of Sydney near the township of Tarago, the French company Veolia is using methane from household garbage to generate enough power for 12,000 homes, plus run a demonstration barramundi growout and aquaponics program at their Woodlawn Eco-Project.

The Russian city of Kostroma is located at the confluence of the Volga and Kostroma Rivers, about 700km northeast of Moscow. It has a population of about 270,000.

At one time, the production of post-larvae local prawn was a significant driver for both of the southeast Asian nations of Myanmar and Bangladesh. Nearly a decade ago the two nations had more than 100 hatcheries between them. Today, only a handful remain.

The provision of recirculation equipment, design and advice for hatchery developments in relation to shrimp farming research, commercial tilapia production and eel breeding innovations are already on the project CV of LandIng Aquaculture, a specialist recirculating aquaculture systems (RAS) enterprise which recently completed its first 18 months in business.

It is an exciting time for a scientist when research meets implementation. And this is exactly why Vasco Mota, a biologist from Portugal, and Jagan Gorle, an expert in computational modelling and flow analysis from India, find themselves at the Nofima facilities in Sunndalsøra.

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