Can we quantify the aquatic environmental plastic load from aquaculture?

Area of Science:

• Environmental Science
• Marine Biology
• Remote Sensing

Background:

• Aquaculture is vital for livelihoods but generates significant plastic pollution, harming aquatic ecosystems.
• Assessing and managing aquaculture plastic waste is crucial for sustainability and water quality monitoring.
• Existing methods often focus on post-contamination monitoring, lacking source-based evaluation.

Purpose of the Study:

• To develop and apply a comprehensive framework for estimating plastic litter generated by aquaculture.
• To understand aquaculture farming patterns and their evolution for accurate plastic load assessment.
• To propose effective management strategies for aquaculture plastic waste.

Main Methods:

• Integration of satellite remote sensing, drone imagery, questionnaires, and in situ measurements.
• Acquisition of multidimensional and multiscale data for comprehensive analysis.
• Development of a source-based framework for plastic load estimation.

Main Results:

• Estimated 3840 tons of plastic waste discharge from oyster floating raft farming in Maowei Sea over four years without improved management.
• Identified key aquaculture farming patterns and their spatial-temporal evolution.
• Demonstrated the framework's applicability to a typical mariculture bay.

Conclusions:

• The developed framework provides a source-based method for evaluating aquaculture plastic pollution, superior to traditional monitoring.
• Recommended measures include strengthened governance, plastic removal, innovative replacements, and behavioral changes.
• The framework is adaptable for regional and global aquaculture plastic litter assessments, supporting pollution control efforts.