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Ocean farmed seaweed harvests underway

Twine wrapped around PVC tubes is seeded with Giant Kelp (Macrocystis pyrifera) ready for deployment at sea. Photo: Craig Sanderson

Acknowledgement of Country 
Research trials are being undertaken on land and sea country of the Neunonne and Paredarerme people in southern and south-eastern Tasmania. 

This year marks Australia’s first harvests of commercial-grade, farmed ocean seaweeds – the first in September, the second in November. Both harvests, in Tasmania, have occurred under the auspices of the Seaweed Solutions Cooperative Research Centres Project (CRC-P), funded through the Department of Industry, Science, Energy and Resources.

The Seaweed Solutions CRC-P officially kicked off in June 2019 and began work in earnest at the start of this year. Partners in the CRC-P include Tassal Group Ltd, the University of Tasmania’s (UTAS) Institute for Marine and Antarctic Studies (IMAS), Deakin University and Spring Bay Seafoods.

Developing commercial production practices for native seaweeds is part of research that has been underway in Tasmania for four years, with the aim to develop an integrated multi-trophic aquaculture (IMTA) system. Aquaculture company Tassal Group has been the leading force behind this work, conducted in conjunction with its Atlantic Salmon farm operations in the state.

Tassal seaweed biologist Craig Sanderson says the trials now underway build on previous research the FRDC funded to develop culture methods for Tasmanian native seaweeds. During that project, IMAS researchers led by Catriona Hurd have helped to establish gametophyte-seeding technology for Giant Kelp (Macrocystis pyrifera), a species listed as threatened under the national Environment Protection and Biodiversity Conservation Act 1999.  

This technology is now also being applied to a locally endemic species of Southern Kombu (Lessonia corrugata) and the more widely found Golden Kelp (Ecklonia radiata). Giant Kelp, Southern Kombu and Golden Kelp are all brown seaweeds with existing markets.

The success of this work means a ready supply of seed gametophyte stock can be made available for commercial trials. The new propagation techniques may also allow producers to skip the hatchery phase and seed seaweeds directly onto lines to be deployed to sea.

Craig Sanderson says this offers a significant cost saving on the more labour-intensive practices used in many Asian countries where seaweed industries are well established. It will help to make Australian production more economically competitive. 

Current Seaweed Solutions CRC-P trials are using gametophyte-seeded ropes at three different locations in south-eastern Tasmania. The primary site is at Okehampton Bay, on a Spring Bay Seafoods site adjacent to Tassal’s fish farming operations. The second site is at Great Taylor Bay, on Bruny Island, on a Tassal aquaculture lease.

IMAS holds the lease on another site at Tower Bay, near Dover. As in previous trials, Giant Kelp has remained the most easily established and fastest growing of the three species propagated.

Head of the Ecolology and Biodiversity Centre within IMAS Catriona Macleod says while modest, the harvests are a significant achievement given the many challenges posed by the COVID-19 pandemic.

“We couldn’t have done this without the industry–research collaboration, which is why CRCs are so important. Our next step is to get some product out to the markets and see what they think,” she says.

Deakin University’s Alecia Bellgrove, a specialist in seaweed product quality, says the research team was keen to analyse the composition and quality of the three species harvested.

“We hope this can show us not only the potential of these seaweeds for food and agriproducts, but also how the Australian species grown in clean cool waters off Tasmania differ from those grown elsewhere,” she says. 


Other FRDC-funded seaweed-related projects include: 
The creation of an Australian Standard for aquatic plant names (2017-212), designed to provide a shared language and understanding about the plants and products available in Australia; cultivation trials of the red Asparagopsis species in South Australia (2019-144); also in South Australia, research into Ulva species as potential aquafeed ingredient for farmed Abalone (2019-156); and the use of local seaweed species to offset nutrient loads in Moreton Bay, Queensland (2019-032). 

More information

Craig Sanderson

E [email protected]

Wayne Hutchinson

E [email protected] 

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Fisheries Research and Development Corporation (FRDC)

The Fisheries Research and Development Corporation (FRDC) is a co-funded partnership between its two stakeholders, the Australian Government and the …
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    Research funding body