Seaweed Farming
1. At a Glance
- Seaweed farming = cultivation of marine macroalgae (red, green, brown) for food, hydrocolloids (agar, carrageenan, alginate), biofertilisers, biostimulants, pharma and biofuel feedstock [S1][S2].
- India's 11,099 km coastline offers vast mariculture potential; flagged as a sunrise sector under the Blue Economy push and PMMSY [S1][S2].
- Relevant for GS-III (agriculture, fisheries, environment) and GS-I (geography of coastal resources).
2. Why in the News
- PIB (10 Feb 2026): Ministry of Fisheries, Animal Husbandry & Dairying confirmed identification of 384 potential sites covering 24,707 ha across coastal States/UTs for seaweed cultivation, mapped by ICAR-CMFRI and CSIR-CSMCRI [S1].
- Continuing rollout of the Multipurpose Seaweed Park at Thondi, Ramanathapuram (Tamil Nadu) approved at ₹127.7 crore [S2][S3].
3. Background & Evolution
- Traditional commercial harvest of wild seaweed in Gulf of Mannar (Tamil Nadu) since the 1960s for agar industry [S2].
- 2008: ICAR-CMFRI standardised raft and tube-net culture for Kappaphycus alvarezii [S2].
- 2020: PMMSY launched (₹20,050 crore) with seaweed as a flagship mariculture component [S2][S3].
- 2021-22 Union Budget: announcement of a Multipurpose Seaweed Park in Tamil Nadu [S3].
- 2023: Foundation stone for the Park laid at Thondi during Sagar Parikrama Phase VIII [S3].
4. Core Static Facts
- Nodal Ministry: Ministry of Fisheries, Animal Husbandry & Dairying — Department of Fisheries [S1].
- Implementing scheme: Pradhan Mantri Matsya Sampada Yojana (PMMSY), launched 2020, outlay ₹20,050 crore [S3].
- PMMSY seaweed production target: 1.12 million tonnes (wet) in 5 years [S2][S3].
- Allocation for seaweed (2020-25): ₹640 crore, of which ₹194.09 crore earmarked for the TN Seaweed Park and Daman & Diu Seaweed Brood Bank [S3].
- Multipurpose Seaweed Park (Thondi, TN): ₹127.7 crore outlay [S3].
- Current production (2023): 72,385 tonnes wet weight [S2].
- Sites identified: 384 sites / 24,707 ha across coastal States/UTs (CMFRI + CSMCRI mapping) [S1].
- PMMSY assistance approved: 46,095 rafts + 65,330 monoline tube-nets [S2].
- Key cultivated species: Kappaphycus alvarezii (carrageenan) and Gracilaria edulis (agar) [S2].
- R&D anchors: ICAR-CMFRI (Kochi) and CSIR-CSMCRI (Bhavnagar) [S1].
5. Multi-Dimensional Analysis
Economic - Low-capex livelihood for coastal fishers; high-value export segment via hydrocolloids (agar, carrageenan, alginates) [S2]. - Seaweed park to enable value chain — seed banks, processing, exports [S3].
Social - PMMSY targets coastal fisher youth and fisherwomen, with women-led SHGs dominant in Ramanathapuram raft culture [S3].
Environmental - Seaweed sequesters CO₂, absorbs excess nutrients (bioremediation), needs no land, freshwater, fertiliser [S2]. - Invasive risk: Kappaphycus alvarezii implicated in coral damage in Gulf of Mannar Marine National Park; site selection must avoid MPAs [S2].
Scientific / Technological - Standardised tube-net and bamboo raft techniques (CMFRI/CSMCRI); ongoing tissue-culture seed production at brood bank, Daman & Diu [S2][S3].
Administrative / Federal - Coastal States/UTs implement; Centre funds via PMMSY; Fisheries is a State subject (Entry 21, State List for inland; Entry 57 of Union List for territorial waters fisheries) — coordination via DoF.
6. Recent Developments (last 12-18 months)
- Feb 2026: PIB confirms 384 sites / 24,707 ha mapped for cultivation [S1].
- 2024-25: New import guidelines for seaweed germplasm issued by MoFAH&D to safeguard biosecurity [S2].
- 2023-24: Foundation stone for Thondi Multipurpose Seaweed Park laid under Sagar Parikrama VIII [S3].
- PMMSY approvals: cumulative 46,095 rafts and 65,330 tube-nets [S2].
7. Prelims Hooks
- India's coastline length: 11,099 km [S1].
- 384 sites / 24,707 ha identified for seaweed cultivation [S1].
- Mapping by ICAR-CMFRI (Kochi) and CSIR-CSMCRI (Bhavnagar) — note CSMCRI is under CSIR, not ICAR [S1].
- Nodal scheme: PMMSY, launched 2020, outlay ₹20,050 crore [S3].
- Seaweed production target under PMMSY: 1.12 million tonnes in 5 years [S2].
- Multipurpose Seaweed Park at Thondi, Ramanathapuram, Tamil Nadu; outlay ₹127.7 crore [S3].
- Seaweed Brood Bank location: Daman & Diu [S3].
- Principal species: Kappaphycus alvarezii (carrageenan, red algae) and Gracilaria edulis (agar, red algae) [S2].
- Park announced in Union Budget 2021-22 [S3].
- Current seaweed production (2023): 72,385 t wet weight [S2].
- Nodal ministry: Fisheries, Animal Husbandry & Dairying (Dept. of Fisheries) [S1].
- Major natural seaweed bed: Gulf of Mannar, Tamil Nadu [S2].
8. Mains Relevance
- GS-III: Economics of animal-rearing / Marine resources / Blue Economy / Food processing.
- GS-I: Distribution of natural resources (coastal geography).
- Possible stems: 1. "Seaweed farming offers a low-cost, climate-resilient pathway to diversify coastal livelihoods in India. Examine." 2. "Discuss the institutional and ecological challenges in scaling seaweed cultivation under PMMSY." 3. "How can India's Blue Economy strategy leverage mariculture without compromising marine biodiversity?"
9. Related Topics to Study Next
- PMMSY — parent scheme funding seaweed components.
- Blue Economy / Sagarmala — strategic context for coastal value chains.
- Gulf of Mannar Biosphere Reserve — ecological constraint on Kappaphycus expansion.
- ICAR-CMFRI & CSIR-CSMCRI — research institutions frequently asked in Prelims.
- National Fisheries Development Board (NFDB), Hyderabad — implementing arm.
- Sagar Parikrama — outreach programme under which foundation was laid.
- Coastal Aquaculture Authority Act, 2005 — regulatory frame.
- Carbon sequestration & "blue carbon" ecosystems — environmental link.
10. Common Errors / Trap Areas
- CSMCRI is under CSIR, not ICAR; CMFRI is under ICAR. Easy to confuse [S1].
- Seaweed Park is at Thondi, Ramanathapuram (TN), NOT in Andhra Pradesh or Gujarat [S3].
- Brood Bank is in Daman & Diu, not in Tamil Nadu [S3].
- PMMSY target is 1.12 million tonnes of seaweed (not fish overall) [S2].
- Kappaphycus alvarezii is a red alga, exotic species — treated as invasive near Gulf of Mannar corals.
- PMMSY outlay is ₹20,050 crore (whole scheme), not the seaweed-only figure (₹640 cr) [S3].
11. Sources
- [S1] Seaweed Farming — Press Information Bureau, MoFAH&D, 10 Feb 2026 — https://www.pib.gov.in/PressReleasePage.aspx?PRID=2225765 — (tier: 1)
- [S2] Seaweed: A Nutritional Powerhouse From The Ocean — PIB feature — https://www.pib.gov.in/PressReleasePage.aspx?PRID=2118317 — (tier: 1)
- [S3] Foundation Stone for Multi-Purpose Seaweed Park, Tamil Nadu (Sagar Parikrama VIII) — PIB — https://www.pib.gov.in/PressReleaseIframePage.aspx?PRID=1954383 — (tier: 1)
