“We believe in collaboration, we cannot solve this problem on our own.”
Imagine a fishing net that snags on a reef or a wreck and gets detached from the fishing vessel. Nets, long lines, fish traps or any other contraptions designed to catch fish or marine organisms are capable of ghost fishing – without anyone profiting from the catches. Furthermore, they affect commercial fish stocks which are already in a very bad condition. Consequently, fish die and attract scavengers which will also entangle and die in that same net, thus creating a vicious circle.
Source: http://www.ghostdiving.org/