I had previously alluded to the “acoustic fingerprint” (or how objects reflect sound in the water) of marine critters we detect via our echosounders in my first blogpost, and I’d like to expand a little bit on that today. An animal’s acoustic fingerprint, or target strength (TS, dB re: 1 m2), is affected by a lot of things, such as an animal’s size (e.g., length, fatness) and shape (e.g., round, skinny), and how the animal is oriented relative to the surface (e.g., horizontal, head facing the surface).