Unregulated clam-harvesting can lead to overexploitation of marine resources. Clams that are big enough to spawn are frequently being taken away in large numbers, leaving the remaining clams with limited potential to reproduce and supply new clams. Likewise when small clams that have yet to reach maturity are harvested, there will be no clams left to grow and reproduce. Targeted clams will drop in numbers drastically, eventually leading to changes in community structure and a clash in clam diversity1.
Based on data from citizen science surveys and research findings, WWF has formulated clam gauges to serve as reference for the public. As an interim measure before clam-digging activity is officially managed, WWF recommends that clam diggers not collect clams smaller than the clam gauge. Give clams a chance to reproduce and let the small ones grow!
Principles behind clam gauge design
Based on data from citizen science surveys and research findings, WWF has formulated clam gauges to serve as reference for the public. As an interim measure before clam-digging activity is officially managed, WWF recommends that clam diggers not collect clams smaller than the clam gauge. Give clams a chance to reproduce and let the small ones grow!
Principles behind clam gauge design
- Based on literature reviews to understand the relationship between sizes and maturity for different clam species; the suggested clam gauge size is the size of over half of the individuals of that species deemed mature
- Takes reference from the statutory minimum size of catches of the same species in other regions
- Based on a comparison of data obtained from WWF citizen science ecological surveys, to ensure the designated sizes on the clam gauges are applicable to local shores
- In the long term, clam gauges will be reviewed regularly to accommodate for any changes in the status of the local clam community.