This master thesis was conducted in collaboration with the Biochemical Engineering & Environmental Biotechnology lab of the Technical University of Crete within an Erasmus+ mobility (February-September 2022, most of experimental activity) and the Circular Economy lab of the Politecnico of Torino (data analysis and some experimental activity). Bioplastics are biodegradable and/or biobased polymers that are attracting increasing interest in the marketplace and in the literature as sustainable alternatives to conventional fossil-based plastics. Bioplastics undergo the same degradation mechanisms as conventional plastics, and their degradation depends on their physico-chemical properties as well as on the exposure environment. Biopolymers are often biodegradable only under specific and controlled conditions, therefore their behavior in the marine environment is still unclear and raises concerns in the scientific community.