Summary[edit] Description: English: "The mooring is called a DAFT (Direction Acoustic Fish Tracker). On the DAFT there are instruments that measure ocean temperature, salinity, and pressure. The primary instrument is an echo sounder that records any schools of fish that may pass overhead. What the DAFT was not designed to do, but does well, is catch sea life. The fiberglass pallet has 1 1/2″ square holes in it that allow water to pass through on retrieval and it also catches sea life as if it were a net. Yesterday we pulled two of these “Legos” from the sea and they were covered with marine life. The most remarkable sight were the large blue king crabs, (around half dozen on one pallet). On the smaller size, we found a hermit crab (shown here hiding in a shell)." --Roy Moffitt. Date: August 2018. Source: https://twitter.com/TeacherAtSea/status/1346151708662013952/photo/1. Author: NOAA.