122. Which one of the following is used for culturing Pernaviridis?
1. Raft culture with hanging ropes.
2. Offshore cages and Pens.
3. Irrigated or flow through tanks.
4. Multitrophicrecirculatory canal culture cage.
Culturing Perna viridis (Green Mussel): Best Method and Aquaculture Practices
Perna viridis, commonly known as the green mussel, is an economically valuable bivalve extensively farmed in tropical and subtropical coastal waters. Among the various aquaculture systems used for shellfish farming, the most suitable method for culturing Perna viridis is:
1. Raft culture with hanging ropes.
Why Raft Culture with Hanging Ropes?
Raft culture is a proven and widely adopted method in shellfish aquaculture. This technique involves suspending ropes or nets from floating rafts anchored in sheltered coastal waters. Here’s why it’s ideal for Perna viridis:
1. Natural Habitat Mimicking
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Green mussels naturally attach to hard substrates in the intertidal and subtidal zones.
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Hanging ropes provide vertical surfaces for mussels to attach and grow in water columns where food availability and water flow are optimal.
2. Efficient Growth and Harvest
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Mussels cultured using this method experience good water exchange, bringing a continuous supply of phytoplankton (their natural food).
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Growth rates are generally higher, and harvesting is straightforward by lifting the ropes.
3. Low Maintenance and Cost-Effective
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Requires minimal infrastructure and maintenance.
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Environmentally sustainable, as mussels filter feed and improve water quality.
Why Other Options Are Less Suitable
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Offshore cages and pens: Used primarily for finfish like seabass or groupers, not for sessile bivalves like mussels.
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Irrigated or flow-through tanks: Costly and more common for hatchery operations or juvenile rearing, not for grow-out of mussels.
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Multitrophic recirculatory canal culture cage: A sophisticated system suited for integrated multi-trophic aquaculture (IMTA), but not specific or economical for Perna viridis farming alone.
Conclusion
For sustainable and efficient farming of Perna viridis, raft culture with hanging ropes remains the most effective and widely practiced method. This technique leverages natural mussel behavior, ensures high survival and growth, and promotes ecological harmony in aquaculture.
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