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Seaweed harvest. (Photo: SAMS)

Experts offer advice for seaweed industry to remain sustainable

Click on the flag for more information about United Kingdom UNITED KINGDOM
Monday, September 05, 2016, 23:50 (GMT + 9)

Taking advantage of the expertise of 21 institutions worldwide, UN University’s Canadian-based Institute for Water, Environment and Health, and the Scottish Association for Marine Science, a UNU associate institute, have published policy advice to the multi-billion dollar seaweed industry to help it avoid expensive mistakes and pursue best practices, backed by relevant case studies involving crops like bananas and shrimp.

The reason for the recommendations is that the wide varieties of uses of seaweed, from food and fertilizer to pharmaceuticals and industrial gels,  are driving the rapid growth of an industry that could easily and needlessly drop into some of the same pitfalls previously experienced in both agriculture and fish farming.

According to the policy authors, seaweed farms now produce more than 25 million metric tonnes annually and the global value of the crop, reaching USD 6.4 billion (2014), exceeds that of the world’s lemons and limes.

Seaweed farming has grown from the late 1950s into an industry offering sustainable employment in developing and emerging economies, notably China (which produces over half of the global total of seaweed — 12.8 million tonnes) and Indonesia (27 per cent of global production — 6.5 million tonnes). Other major producers include the Republic of Korea and the Philippines.

These authors mention, among others, some of the industry’s many wide-ranging benefits:

  • With fisheries stagnating, cultivating seaweed helps fill a gap and “is widely perceived as one of the most environmentally benign types of
  • Indirectly, seaweed farming has reduced over-fishing in many regions, providing coastal communities with an alternative livelihood. In some places, women have become economically active for the first time.
  • aquaculture activity, as it does not require additional feed or fertilisers. Consequently, it has been actively promoted by government initiatives, particularly in many developing countries where communities have reduced access to alternative livelihoods or are involved in more destructive fishing methods like dynamite fishing.
  • Increasingly, seaweed cultivation is also being integrated with intensive fish farming to provide nursery grounds for juvenile commercial fish and crustaceans, and to filter undesired nutrients and improve the marine environment and reduce eutrophication.


Most of the seaweed produced is used for human consumption with much of the remainder used largely as a nutritious additive to animal feed or as a fertiliser.

In the last decade, seaweed cultivation has been rapidly expanding thanks to growing demand for its use in pharmaceuticals, nutraceuticals and antimicrobial products, as well as biotechnological applications.

Seaweed today is used in some toothpastes, skin care products and cosmetics, paints and several industrial products, including adhesives, dyes and gels. Seaweed is also used in landscaping or to combat beach erosion.

“The rapid expansion of any industry, however, can result in unforeseen ecological and societal consequences,” according to the authors.

Communities that come to depend on a single crop for their livelihood become highly vulnerable to a disease outbreak, as happened in the Philippines between 2011 and 2013 when a bacteria that whitens the branches of a valuable seaweed species caused a devastating loss to the communities involved, estimated at over USD 310 million.

The authors explained that the industry needs to guard against non-indigenous pests and pathogens, to promote genetic diversity of seaweed stocks and to raise awareness of mistakes in farm management practices (such as placing the cultivation nets too close together, making the crop more vulnerable to disease transfer and natural disasters).

“In addition, the illegal use of algicides / pesticides, with unknown but likely detrimental consequences for the wider marine environment, user conflicts for valuable coastal resources and rising dissatisfaction over the low gate prices for the crop can all result in negative impacts on the industry,” the authors pointed out.

The experts noted that increasing demands being placed on the marine environment and competition for maritime space (renewable energy, aquaculture, fisheries, etcetera) necessitates coordination and co-operation between different users, an ecosystem-wide management approach and marine spatial planning (MSP) for aquaculture, alongside regulation to protect the wider marine environment.

The authors stressed the key points for the seaweed industry come down to:

  • Biosecurity: preventing the introduction of disease and non-indigenous pests and pathogens;
  • Investing in risk assessment and early disease detection;
  • Building know-how and capacity within the sector;
  • Cooperative planning to anticipate and resolve conflicts between competing interests in finite coastal marine resources; and
  • Establishing management policies and institutions at both national and international levels.

 


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