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<p>Seaweed aquaculture plays a vital role in supporting coastal livelihoods and supplying hydrocolloids to global industries, with the higher economic value of carrageenophytes realized through downstream processing rather than raw biomass. However, prolonged vegetative propagation has been associated with a decline in growth vigour and productivity in carrageenan-producing species. This study evaluated the growth performance of callus<b>-</b>derived thalli of <i>Kappaphycus striatus</i> cultivated under field conditions in Van Phong Bay, Vietnam, with emphasis on their suitability as commercial seedstock. Two consecutive experiments were conducted from August 2024 to June 2025: (1) assessment of growth performance (biomass accumulation and daily growth rate, DGR), carrageenan characteristics, and heavy metal accumulation of callus-derived V<sub>0</sub> thalli during a 10-week field cultivation period; and (2) evaluation of performance consistency across five successive vegetative propagation cycles based on growth performance and carrageenan quality. Initial callus-derived thalli exhibited significantly enhanced biomass accumulation, reaching 1312 ± 26.96&#xa0;g thallus⁻<sup>1</sup> after eight weeks, with a mean DGR of 7.07 ± 0.49% day⁻<sup>1</sup>. Carrageenan content peaked at 29.67 ± 0.80%, while viscosity (152.67 ± 5.40 cps) and gel strength (&gt; 900&#xa0;g&#xa0;cm⁻<sup>2</sup>) indicated improved carrageenan quality. Across propagation cycles, callus-derived thalli maintained stable DGR (average 5.06 – 5.33% day⁻<sup>1</sup>) and consistently high carrageenan quality, while heavy metal concentrations (cadmium, lead, and mercury) remained lower than in farmed thalli and within international safety limits. These findings suggest that callus<b>-</b>derived of <i>K. striatus</i> exhibits consistent growth performance and product quality under field conditions, supporting its potential use as a seedstock for tropical seaweed aquaculture.</p>

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Phyconomic and product safety–related advantages of callus-derived Kappaphycus striatus across five successive vegetative propagation cycles under field farming conditions in Van Phong Bay, Vietnam

  • 期刊论文

  • 发表日期：

    2026年7月6日

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  • Vu Thi Mo,
  • Le Trong Nghia,
  • Phan Minh-Thu,
  • Pham Hong Ngoc,
  • Pham Duc Thinh,
  • Huynh Hoang Nhu Khanh,
  • Tran Mai Duc,
  • Cao Van Nguyen,
  • Huynh Minh Sang,
  • Hua Thai An

摘要

Seaweed aquaculture plays a vital role in supporting coastal livelihoods and supplying hydrocolloids to global industries, with the higher economic value of carrageenophytes realized through downstream processing rather than raw biomass. However, prolonged vegetative propagation has been associated with a decline in growth vigour and productivity in carrageenan-producing species. This study evaluated the growth performance of callus-derived thalli of Kappaphycus striatus cultivated under field conditions in Van Phong Bay, Vietnam, with emphasis on their suitability as commercial seedstock. Two consecutive experiments were conducted from August 2024 to June 2025: (1) assessment of growth performance (biomass accumulation and daily growth rate, DGR), carrageenan characteristics, and heavy metal accumulation of callus-derived V0 thalli during a 10-week field cultivation period; and (2) evaluation of performance consistency across five successive vegetative propagation cycles based on growth performance and carrageenan quality. Initial callus-derived thalli exhibited significantly enhanced biomass accumulation, reaching 1312 ± 26.96 g thallus⁻1 after eight weeks, with a mean DGR of 7.07 ± 0.49% day⁻1. Carrageenan content peaked at 29.67 ± 0.80%, while viscosity (152.67 ± 5.40 cps) and gel strength (> 900 g cm⁻2) indicated improved carrageenan quality. Across propagation cycles, callus-derived thalli maintained stable DGR (average 5.06 – 5.33% day⁻1) and consistently high carrageenan quality, while heavy metal concentrations (cadmium, lead, and mercury) remained lower than in farmed thalli and within international safety limits. These findings suggest that callus-derived of K. striatus exhibits consistent growth performance and product quality under field conditions, supporting its potential use as a seedstock for tropical seaweed aquaculture.