International Journal of Aquaculture, 2024, Vol.14, No.4, 211-220 http://www.aquapublisher.com/index.php/ija 215 Metabolomic analysis revealed elevated levels of bioactive compounds, such as harmine and prostaglandin E2. These findings suggest that SDF fromLaminaria japonica can alleviate type 2 diabetes symptoms, highlighting its potential as a functional food ingredient for managing diabetes. 5.3 Sustainable resource use Sustainable resource use involves optimizing the utilization of Laminaria japonica to maximize its economic and environmental benefits. For example, the co-production of biodiesel and alginate fromLaminaria japonica has been demonstrated as a viable approach to enhance the economic feasibility of seaweed farming. This process involves the extraction of mannitol for biodiesel production and the simultaneous recovery of alginate, a high-value product used in various industries (Kim et al., 2019). Furthermore, the polysaccharides extracted from Laminaria japonica have been shown to possess multiple biological activities, including antioxidant, anti-inflammatory, and immunomodulatory properties, which can be harnessed for therapeutic and nutritional applications (Luan et al., 2021; Li et al., 2021). By fully utilizing the various components of Laminaria japonica, farmers can achieve a more sustainable and profitable cultivation system. 6 Case Studies of Sustainable Laminaria japonica Farming 6.1 Successful implementation examples Several successful implementations of sustainable Laminaria japonica farming have been documented, showcasing the potential for environmentally friendly practices in marine agriculture. For instance, a study on the formation of environmentally persistent free radicals (EPFRs) in biochar derived fromLaminaria japonica grown in different habitats demonstrated that the algae biomass-based biochars have similar levels and types of EPFRs as lignocellulosic-biomass-based biochars. This indicates that sustainable farming practices can produce biochars with beneficial properties for environmental applications (Huang et al., 2020). Additionally, the use of Laminaria japonica hydrolysate (LPH) has been shown to promote fucoxanthin accumulation and cell growth in Phaeodactylum tricornutum, suggesting that byproducts of Laminaria japonica farming can be utilized to enhance the production of valuable compounds in other marine organisms (Wang et al., 2021). 6.2 Lessons learned and best practices From these successful implementations, several lessons and best practices have emerged. One key lesson is the importance of optimizing pyrolysis temperatures to achieve higher levels of spin concentrations in biochar, which can enhance its environmental benefits. Specifically, temperatures between 300 °C~500 °C were found to be optimal for producing biochar with higher levels of EPFRs (Huang et al., 2020). Another best practice is the low addition proportion of Laminaria japonica hydrolysate (1.5 ml/L), which was effective in promoting fucoxanthin accumulation and cell growth without the need for large quantities of the hydrolysate (Wang et al., 2021). These practices highlight the importance of precise control over farming and processing conditions to maximize the benefits of sustainable Laminaria japonicafarming. 6.3 Comparative analysis Comparing the sustainable farming practices of Laminaria japonica with other organic farming systems, such as those used in rice paddy landscapes, reveals several similarities and differences. Organic farming in rice paddies has been shown to support higher biodiversity and abundance of various taxonomic groups compared to conventional farming (Katayama et al., 2019). Similarly, sustainable Laminaria japonica farming practices, such as the production of biochar and the use of hydrolysate, contribute to environmental sustainability and the production of valuable compounds. However, while organic rice farming primarily benefits terrestrial and aquatic wildlife, sustainable Laminaria japonica farming has a more direct impact on marine ecosystems and the production of marine-derived products. Both systems emphasize the importance of reducing chemical inputs and optimizing management practices to achieve environmental and economic benefits.
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