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<p>To improve sugar kelp (<i>Saccharina latissima</i>) aquaculture in Nova Scotia, it is necessary to optimize hatchery cultivation methods. The aims of this study were to optimize nutrient concentrations and sterilization techniques to maximize sugar kelp growth while minimizing contamination in the Dalhousie University Aquatron Facility. The individual and interactive effects of three sterilization techniques (35&#xa0;μm filtration + ultraviolet (UV), germanium oxide, and 0.35&#xa0;µm filtration) and two nutrient concentrations (standard F/2 addition and 1/3 F/2 addition) were tested on juvenile sporophyte length and density after six weeks of growth. The effects of the treatments were also tested on sporophytes after harvest. During the hatchery phase, contamination levels were minimal and the 1/3 F/2 nutrient treatments consistently created denser and longer sporophytes than the standard F/2 nutrient treatments. The individual effect of adding germanium dioxide consistently yielded lower sporophyte lengths and densities. In the out-planting phase, all spools grew healthy, commercially viable kelp. These results suggest that sugar kelp growth in the Aquatron may be improved by lowering nutrient concentrations and using only the Aquatron’s base sterilization of 35&#xa0;μm filtration with ultraviolet (UV). While these parameters improved growth at the end of the hatchery phase, there were only minor differences between spools once planted in the ocean, suggesting that proper hatchery protocols can create a good foundation to grow healthy kelp in suitable ocean sites. This study lays the groundwork for future kelp aquaculture research in the Aquatron, supporting the growing kelp aquaculture industry in Nova Scotia.</p>

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Optimizing nutrient concentration and sterilization techniques for the sugar kelp (Saccharina latissima) hatchery phase

  • 期刊论文

  • 发表日期：

    2025年1月28日

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  • Kristen Tymoshuk,
  • Tessa Schaeffer,
  • Lara Mitchell,
  • Sofia Day,
  • Carolyn Buchwald

摘要

To improve sugar kelp (Saccharina latissima) aquaculture in Nova Scotia, it is necessary to optimize hatchery cultivation methods. The aims of this study were to optimize nutrient concentrations and sterilization techniques to maximize sugar kelp growth while minimizing contamination in the Dalhousie University Aquatron Facility. The individual and interactive effects of three sterilization techniques (35 μm filtration + ultraviolet (UV), germanium oxide, and 0.35 µm filtration) and two nutrient concentrations (standard F/2 addition and 1/3 F/2 addition) were tested on juvenile sporophyte length and density after six weeks of growth. The effects of the treatments were also tested on sporophytes after harvest. During the hatchery phase, contamination levels were minimal and the 1/3 F/2 nutrient treatments consistently created denser and longer sporophytes than the standard F/2 nutrient treatments. The individual effect of adding germanium dioxide consistently yielded lower sporophyte lengths and densities. In the out-planting phase, all spools grew healthy, commercially viable kelp. These results suggest that sugar kelp growth in the Aquatron may be improved by lowering nutrient concentrations and using only the Aquatron’s base sterilization of 35 μm filtration with ultraviolet (UV). While these parameters improved growth at the end of the hatchery phase, there were only minor differences between spools once planted in the ocean, suggesting that proper hatchery protocols can create a good foundation to grow healthy kelp in suitable ocean sites. This study lays the groundwork for future kelp aquaculture research in the Aquatron, supporting the growing kelp aquaculture industry in Nova Scotia.