Best Projects 2021 features all the nominated entries submitted ‘Submit your Project’ category. All the entries consist of innovative projects run by existing enterprises in the form of businesses, NGOs or informal programs.

Closed-System Green Mussel Cultivation

Published on July 22, 2021 um 11:29

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Project Leader

Type of Enterprise

informal program/project

Year the ngo or company was founded



Explain your project in details:

The cultivation of P. viridis is one of the activities that encourage and help improve the economic sector of coastal communities in Indonesia. This is because green mussels are in great demand by the public because it tastes good and has a relatively cheap price compared to other seafood foods. Green mussels have a fairly high nutritional value which contains about 16.7-21.9% protein. Seawater pollution is the main obstacle for most green mussel cultivation activities. The condition of polluted waters and heavy metals is present, causes shellfish to have the potential to accumulate polluting heavy metals and serve as bioindicators of water pollution. We provide a new innovative method of cultivating green mussels with the Closed-System Green Mussel Cultivation method. CGMC is a new green mussel culture container design that resembles a cage. This method is carried out onshore using nets with a size of 5x1 m made of wire mesh and arranged into blocks using bamboo. CGMC developed in conservation areas makes green mussels more suitable for consumption by the community. Some of the advantages of this system include a high survival rate due to using a closed container and being in a body of water, no smell of mud and metal, the flow of factory waste does not pass through the cultivation area, the harvesting system is easy and cheap, this system cuts costs and time at harvest, and sustainable because external factors (predators) can be eliminated. The difference between conventional methods and closed systems is the risk of cultivation implementation, the risk during cultivation and the risk of post-cultivation which is directly related to the economic aspect. The conventional method seems simpler, but along the way there are many costs that must be incurred such as boat rental, rafts and renting the services of a driver.

Impact of your enterprise on sustainable development

Many seafood lovers in Indonesia, however, are unaware of the risks of consuming seafood from the bay. Green mussels are abundance in Indonesian Coastal which have been polluted by heavy metals very bad. Pollutants originating from waste discharges from factories, shipping lines, and residential areas. Metal accumulation in mussels can be of importance from the public point of view regarding to health impact. Evidence of this concern to public health was shown by the number of papers reporting on metals contamination in the biota related to human beings. This situation poses a great hazard to Indonesian coastal residents who are known to be seafood consumers especially mussels. Moreover, there area abundance mussel in Indonesian coastal which are catching by fishermen to be sold with very low price so that many peoples in Indonesia chooses this as high protein daily food. Our new system is carried out onshore using nets with a size of 5x1 m made of wire mesh and arranged into blocks using bamboo. CGMC developed in mangrove conservation areas makes green mussels more suitable for consumption by the community. The advantage of the cultivation system using this method is that it produces green mussel products that have a higher nutritional content compared to other green mussel products. The heavy metal content of green mussels tends to be less because they are cultivated in water bodies that are far from the source of waste. The meat produced is also more abundant, almost filling the entire contents of the shell. The color of the green shells is also brighter. In addition, the texture of the meat produced is also chewier, does not smell or taste metal or mud, the color of the meat is healthier and has a delicious taste.

Sustainability and future plans

The time required for one harvest cycle ranges from 3-4 months compared to traditional methods which require a cultivation period of 7 months. The process of planting and harvesting requires a little more effort, but the yields obtained are more promising. 150 Kg of 3-month-old mussels planted and harvested after 4 months yielded approximately 450 Kg per module with a possible ratio of 1: 3. The seeds were sown in a wire mesh frame, as much as 150kg per module. 12 skeleton modules will be placed in the water. The initial investment and operational costs in the first cycle are IDR 70,000,000 ($5000). HPP costs using traditional calculations are the sum of material costs, direct labor costs and indirect costs divided by the number of harvests. Obtained HPP of IDR 3,588 from the total production of IDR 20,668,358, - with a total yield of 5,760 kg/cycle. With a selling price of IDR 6,500/kg, the margin per kg is 81%. Based on the investment feasibility analysis, the payback period is obtained after the 3rd cycle or 9th month. The ROI value in years 1 to 5 in a row is 10%; 142%; 294%; 466%; and 656%. The NPV value is IDR 606,405,385 in the 5th year with an IRR value of 115.7% For sustainable development, in each cycle there will be an addition of 1 green mussel framework module. And in the future, we also want to meet the export demand for green mussels that have been certified low in hazardous and toxic substances.

Your profile as an entrepreneur

Hello, Christian Delahoya here. I am 24 years old from Sumatra, North of Indonesia. Studying at Diponegoro University, majoring in fisheries, which made me learn a lot and be interested in the coast and its people. When we talk about the coast, what comes to mind is their activity in the sea. The sea provides several good resources of fish, crabs and shellfish. In this context, I would like to discuss the marine product of clams, namely green mussels (Perna viridis). The ironic incident that my team and I saw in the field was the harvesting of green mussels right behind the factory. And all the shells are distributed to consumers' plates. The effects of shellfish consumption are not tomorrow, but we are talking about long term effects. Very dangerous and at risk of causing cancer. I think, with Indonesia, which has a very wide coastline, it is desirable to cultivate green mussels not in a factory environment. So far, the method used in cultivation is bamboo sticking in the middle of the sea. With a high risk of damage due to high waves and high operational costs. Then I made a startup in 2019 with 5 of my colleagues, then proved it all we did the same thing and observed what happened from the beginning until the harvest in 2019. We planted 575 bamboos in the middle of the sea. With the risk of waves, currents, and also weak biosecurity. We only harvested 325 bamboos with a yield of 1200kg. We think and make a follow-up design to overcome this, namely Closed-system green mussel cultivation. Closed-system green mussel cultivation is a new cultivation design that uses a grow-out cultivation container. This system was created to overcome the problems that often occur in the traditional method, using bamboos.

Our Offshore Green Mussel Cultivation (Traditional System)

Our Experiment Results to Put the Green Mussel in the Onshore (brackish water)

Isometric View of Conceptual Design of Closed-System Green Mussel Cultivation

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