Mussel - CMFRI's Open-Sea Farming

Publication date: 22 October 2026

Why in the News

The Vizhinjam unit of the ICAR-Central Marine Fisheries Research Institute (CMFRI) has started its first full open-sea mussel longline farming unit (The Hindu).

Key Facts (Static)

• Mussels are bivalve molluscs - the marine family Mytilidae and the freshwater family Unionidae; more common in colder seas.
• Usually 5-15 cm, wedge/pear-shaped shells; dark blue/greenish-brown outside, pearly sheen inside.
• They attach to hard surfaces with protein-rich threads called byssus; they live in dense groups.
• Filter-feeders: They take food by filtering water, so pollutants including microplastics accumulate in their tissues - used for decades as bioindicators of marine pollution.
• Uses: Nutritious food (protein, omega-3), pearl production from freshwater mussels.

Exam Utility

Blue Revolution, mariculture, ecology.

Prelims Style: Practice Questions

Context and Detailed Explanation

See mussel farming in connection with the larger change in India's fisheries sector. In the era of the "Blue Revolution", India is moving beyond traditional fish-catching towards mariculture (marine aquaculture) - this reduces pressure on natural stocks and gives coastal communities a sustainable livelihood. CMFRI (under ICAR, headquartered in Kochi) is the country's leading marine fisheries research institution; this unit at Vizhinjam (Kerala coast) is a technical laboratory in the same direction.

Understand the longline method: long ropes/lines are floated in the sea, from which mussel seed (spat) is attached and hung; the mussels cling to the rope with their byssus threads and grow by filtering natural suspended food (phytoplankton) - they need neither external feed nor fertiliser. This is what makes it "low-cost, eco-friendly" farming.

Ecologically, mussels play a dual role: on one hand they clean the water through filter-feeding; on the other, because of this very trait, pollutants (heavy metals, microplastics) accumulate in their tissues - which is why they are considered a "bioindicator" of marine pollution. Nutritionally they are a cheap source of protein and omega-3, and freshwater mussels also yield pearls. In the exam, "Blue Revolution + mariculture + bioindicator" - this triad is the essence of this article.

Sources

• The Hindu (21 October 2026): https://www.thehindu.com/news/cities/Thiruvananthapuram/cmfri-launches-open-sea-mussel-longline-farming-unit-at-vizhinjam/article71608419.ece

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