Fish farming goes urban thanks to Israeli ingenuity - by Karin Kloosterman
There's nothing fishy about it. Israeli Prof. Yonathan Zohar has spent a lifetime researching fish production and has a solution that might stop the world's dramatic decline in fisheries. Hip "green" environmentalists and sushi lovers will like it too.
Using advanced concepts of microbiology, Zohar has entrained special microbes to live in symbiosis with the fish in order to digest their waste. Aerated by plastic plugs that house the microbes, the fish pools are bio-secure and contaminant free, according to Zohar. In addition, part of the solid waste that is created by uneaten food or microbial byproducts is converted into methane and used as biofuel, says Zohar. This is significant. Zohar was one of the original team to develop the technology of fish farming in floating cages at sea in Israel. These cages have become deeply controversial because the waste created by the farmed fish pollutes the surrounding seawater. In addition, the waters where the fish are raised are often heavily polluted with heavy metals such as mercury, leading to problems such as the recent toxic sushi scare in the US. "I am trying to develop the next generation technology, to address cages and nets in light of environmental concerns," he says. "It is clear we are over-harvesting the ocean and running out of fish. We've focused on an alternative land-based method that can be used in the urban environment."
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