@all The density of silver eels (Anguilla anguilla) commonly used for trap-and-transport operations can vary depending on various factors such as local regulations, transportation methods, and the specific objectives of the operation. However, there are some general guidelines and practices followed in trap-and-transport initiatives.

It is important to note that specific guidelines and recommendations for silver eel trap-and-transport operations can differ between countries, regions, and even specific projects. It is advisable to consult local fisheries authorities, scientific literature, or experts in the field who have experience with trap-and-transport initiatives for silver eels. They can provide more precise and region-specific information on the commonly used densities for trap-and-transport operations with silver eels (A. anguilla).