The global demand for sustainable food production has driven the expansion of aquaculture, with seaweed farming emerging as a rapidly growing sector. Kelp aquaculture is recognised for its potential contributions to food production, carbon sequestration, and nutrient bioremediation. However, its ecological effects remain poorly understood, with potential impacts on hydrodynamics, shading, organic carbon inputs, nutrient levels, biosecurity and species interactions.
In Tasmania, the cultivation of Macrocystis pyrifera (giant kelp) has gained interest due to its fast growth and commercial potential. However, limited research has compared farmed kelp to natural populations. Understanding the physiological and ecological differences between these environments is essential for assessing the sustainability of kelp farming and its role in ecosystem services.
This study is part of a Blue Economy CRC project examining the potential for offshore kelp mariculture in Tasmania and involves a series of in situ chamber experiments conducted at an experimental kelp farm in Fossil Cove and a nearby natural reef. Key research components include:
1. Physiological Comparisons – Measuring differences in photosynthetic performance, respiration, nutrient uptake, and carbon and nitrogen ratios between cultured and natural kelp.
2. Ecological Assessments – Analysing variations in macrofaunal assemblages associated with cultured and wild kelp populations.
3. Ecosystem Contributions – Evaluating the role of kelp farms in the provision of ecosystem services and better understanding potential ecological and social tradeoffs.
This research will enhance our understanding of the ecological and physiological differences between cultured and wild Macrocystis pyrifera, shedding light on how kelp aquaculture affects marine ecosystems. The findings will inform the development of sustainable aquaculture practices in Tasmania, with broader implications for global kelp farming. By exploring key factors such as productivity, nutrient uptake, and macrofaunal communities, this study will contribute to the responsible management and growth of the kelp aquaculture industry.
