The development of products for human consumption with added value from hydrobiological resources generates remnants of the raw material that are classified as co-products, by-products and solid and liquid organic waste that, if not treated, cause a negative environmental impact. The use of these remnants for agricultural purposes is a reason for research because they have bioactive compounds and minerals of interest; Thus, the by-products have been used in bioprocesses that use eco-friendly methods such as aerobic biodegradation, fermentation, hydrolysis and extraction in the case of macroalgae. The products obtained from bioprocesses, depending on their composition of macronutrients, micronutrients, amino acids, microorganisms and bioactive compounds, can be considered as organic fertilizer and/or biostimulant, whose effect ranges from the improvement of growth and development in plant...