Indonesia's 'green gold' (Part 3): Cultivating environmentally friendly seaweed

Key Concepts

• Seaweed Cultivation (Longline Method): A vertical farming technique for seaweed, maximizing space and utilizing the water column.
• High-Density Polyethylene (HDPE) Buoys: Durable, recyclable plastic floats used as replacements for single-use plastic bottles in seaweed farming.
• Downstreaming: Strengthening the processing and value-addition within the seaweed industry.
• Sustainable Seaweed Farming: Practices aimed at reducing environmental impact and promoting long-term viability of the industry.
• Seaweed Nurseries: Facilities for cultivating healthy seaweed seedlings to improve harvest quality and prices.

The Problem of Plastic Pollution in Indonesian Seaweed Farming

Indonesia, a major global seaweed producer, currently relies heavily on single-use plastic bottles as buoys in the longline cultivation method. These bottles provide buoyancy for the seaweed lines, keeping them at optimal depths for growth. However, this practice generates significant plastic waste, contributing to ocean pollution. The traditional plastic bottles used are often discarded after only one or two harvest cycles, exacerbating the problem.

The South Sulawesi Pilot Project: HDPE Buoys as a Solution

A government-led pilot project in South Sulawesi is addressing this issue by introducing buoys made from high-density polyethylene (HDPE). HDPE is a thermoplastic characterized by a high strength-to-density ratio and, crucially, recyclability. Farmers like Ruslan are among the first to receive these more durable buoys.

The benefits of HDPE buoys, as highlighted by Ruslan, include:

• Durability: They can withstand multiple harvest cycles (potentially years) compared to the single or double harvest lifespan of traditional plastic bottles.
• Stability: They don’t rotate or tangle in the currents, maintaining consistent line positioning. (“Kedua, tidak terputar, tidak terputar di bentangan. Kalau di laut karena ombak terputar tidak dia ini bagusnya tidak terputar.”)
• Recyclability: At the end of their lifespan, they can be recycled, reducing plastic waste.

The Longline Method Explained

The longline method, the dominant cultivation technique, involves attaching seaweed fragments (functioning as seedlings) to main ropes. These ropes are then suspended from the buoys, creating a vertical farm. This method efficiently utilizes the water column for seaweed growth, maximizing production in a given area.

Beyond Buoys: A Holistic Approach to Sustainability

The government’s initiative extends beyond simply replacing plastic bottles. It aims for a broader transformation of knowledge among farmers regarding the environmental impact of plastic pollution. The goal is to encourage a reduction in plastic use and explore alternative materials. (“sebetulnya ee ini bukan hanya sekedar mengganti, tapi yang paling penting itu adalah transformasi knowledge kepada mereka bahwa ee plastik itu adalah ee apa namanya? pencemar di laut yang kalian mereka harus kurangi.”)

Discussions with farmers are being encouraged to identify locally-sourced alternatives, such as used sandals or coconut shells. (“penting juga misalnya mengajak masyarakat atau petani itu untuk berdiskusi kira-kira ee jalan keluar atau alternatif lain penggunaan botol plastik itu apa baiknya? Karena saya meyakini ee beberapa daerah atau petani-petani di Sulsel ini, rumput laut itu pasti memiliki atau punya alternatif tersendiri. Mungkin saja misalnya dengan menggunakan e sandal bekas atau kelapa.”)

Strengthening the Seaweed Industry: Downstreaming and Seed Quality

Authorities are also focused on strengthening the “downstreaming” aspect of the seaweed industry – increasing processing and value-addition within Indonesia. Furthermore, they recognize the importance of a consistent supply of high-quality seaweed seeds. Efforts are underway to explore the creation of seaweed nurseries to ensure optimal harvest quality and maximize prices.

Challenges and Future Outlook

Funding remains a challenge for these sustainability initiatives. However, the pilot project in South Sulawesi represents a crucial step towards more sustainable seaweed cultivation practices. The success of this project could significantly strengthen the future of Indonesia’s “green gold” industry – its seaweed sector. As Chandi Vatmani concludes, (“While funding remains a challenge, these efforts are a step towards more sustainable seaweed cultivation and could strengthen the future of Indonesia's green gold industry.”).