Effect of cultivation density and methods for <em>Betaphycus gelatinus</em> in outdoor composite tanks: Impacts on growth and carrageenan quality

Van Huynh Tran; Thi Thuy Hang Cao; Thanh Trung Vo; Anh Khoa Truong; Mai Duc Tran; Thi Mo Vu; Trong Nghia Le; Duc Thinh Pham; Truong Trung Lien Le; Duc Hung Pham; Hoang Nhu Khanh Huynh

doi:10.15625/1859-3097/22739

Effect of cultivation density and methods for Betaphycus gelatinus in outdoor composite tanks: Impacts on growth and carrageenan quality

Tran Van Huynh, Cao Thi Thuy Hang, Vo Thanh Trung, Truong Anh Khoa, Tran Mai Duc, Vu Thi Mo, Le Trong Nghia, Pham Duc Thinh, Le Truong Trung Lien, Hung Pham Duc, Huynh Hoang Nhu Khanh

Author affiliations

Authors

Tran Van Huynh Institute of Oceanography, VAST, Vietnam
Cao Thi Thuy Hang Institute of Oceanography, VAST, Vietnam; Graduate University of Science and Technology, VAST, Vietnam
Vo Thanh Trung Institute of Oceanography, VAST, Vietnam; Graduate University of Science and Technology, VAST, Vietnam
Truong Anh Khoa Institute of Oceanography, VAST, Vietnam
Tran Mai Duc Institute of Oceanography, VAST, Vietnam
Vu Thi Mo Institute of Oceanography, VAST, Vietnam
Le Trong Nghia Institute of Oceanography, VAST, Vietnam
Pham Duc Thinh Institute of Oceanography, VAST, Vietnam
Le Truong Trung Lien Institute of Oceanography, VAST, Vietnam
Hung Pham Duc Institute of Aquaculture, Nha Trang University, Nha Trang, Khanh Hoa, Vietnam
Huynh Hoang Nhu Khanh Institute of Oceanography, VAST, Vietnam; Graduate University of Science and Technology, VAST, Vietnam

DOI:

https://doi.org/10.15625/1859-3097/22739

Keywords:

B. gelatinus, different densities, cultivation methods, carrageenan, outdoor tanks, tank culture

Abstract

This study evaluates the effects of stocking density and cultivation methods on the growth and quality of Betaphycus gelatinus carrageenan in a 3 m³ composite tank system. Seaweed was collected from Thai An, Ninh Thuan, Vietnam, and cultured at densities of 2, 4, 6, and 8 kg/m³ using four methods: (1) culture in hanging net cages, (2) the long-line method, (3) culture on horizontal nets and (4) cultivation attached to artificial coral. The experiment was conducted over 90 days (from June to September 2022). Results showed that the 2 kg/m³ density achieved the highest growth rate, carrageenan content, and quality (p < 0.05) compared to other densities. Among the cultivation methods, mesh cages (1) yielded the lowest growth and carrageenan quality, while the remaining three methods showed no significant differences. This study is the first report on the successful cultivation of B. gelatinus in a 3 m³ composite tank, affirming that a stocking density of 2 kg/m³ along with the hanging rope, mesh frame, and artificial coral attachment methods are optimal choices for B. gelatinus cultivation.

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Published

17-04-2025

How to Cite

Tran , V. H., Cao, T. T. H., Vo, T. T., Truong, A. K., Tran, M. D., Vu, T. M., … Huynh, H. N. K. (2025). Effect of cultivation density and methods for Betaphycus gelatinus in outdoor composite tanks: Impacts on growth and carrageenan quality. Vietnam Journal of Marine Science and Technology, 25(2), 243–254. https://doi.org/10.15625/1859-3097/22739