Fig.1: Schematic view of the ecoSCOPE. Juvenile herring are attacking copepods (A, B and C). The herring keep up a security sphere (escape distance of herring to large objects). With large objects it is impossible to approach closer to the alert herrings than within the shaded area. The sensors are mounted in a small remotely operated vehicle (ROV). The front of the ecoSCOPE is camouflaged by a mirror to reduce the brightness-contrast. Two endoscopes are protruding into the security sphere of the herring: the lower one is projecting a light sheet to illuminate the prey (copepod A and B; copepod C will not show up on the image), the upper endoscope is connected to the predator-sensor (CCD-array a). On this sensor the predators are imaged in detail, and the prey is imaged roughly (example in Fig.3a), because phytoplankton (sketched H-shaped) and microparticles deflect the light and prohibit detailed imaging of the copepod A or B; therefore additionally the copepods are imaged at higher resolution (example in Fig.3a) by the prey-sensor (CCD-array b). The endoscopes are imitating the form and function of long snout of the garfish, as sketched in the upper part. A scanning SONAR-sensor is used to find the microlayer and the herrings from 40 m distance; during the measurements the ROV is hovering neutrally buoyant quietly with all thrusters stopped.

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