This issue of the journal presents research and analyses in areas related to environmental management, renewable energy, biotechnology, and applied ecology. It includes studies on the implementation of microgrids to optimize energy costs in industrial settings, the recording and distribution of hydrozoans in specific marine ecosystems, and the development of low-cost portable devices for agricultural nutritional diagnosis using plant optics. Additionally, ecological aspects of zooplankton in tropical coral formations are addressed, and energy storage systems are evaluated as complements to renewable sources. Studies on water contamination highlight the impact of heavy metals in river basins, while the review on bioactive antioxidant peptides explores their potential for sustainable production systems and local bioeconomies. Together, the issue reflects an interdisciplinary approach aimed at providing rigorous scientific knowledge for the sustainable management of natural and energy resources.