Archaeologists have consulted fishermen for finds and wreck locations since the beginning of maritime archaeology. This research examines how representative fishermen’s finds are of a general region. It focuses on finds in southern Albania and compares them to material from maritime archaeological surveys and excavations in the same region. A model of bycatch of cultural material from submerged sites is put forward, as well as the impact of trawling on in situ deposits. The study also examines marine growth on amphoras to determine general information on the site formation processes acting on them before extraction. Finally, the study examine the location of breaks on amphoras in collections as well as those in situ to determine the impact of trawling on underwater cultural heritage.