RV Corella Fisheries Laboratory cooperated with the Admiralty Research Laboratory to identify fish detected by long-range sonar equipment installed at the Admiralty Experimental Station, Perranporth. The RV "Corella" was directed from the shore to an area some 65 km distant, that was returning a strong and extended echo. The "Corella" was able to correlate this target with shoals detected on a conventional echo sounder, and substantial catches of sprats were taken in the area using a midwater trawl. The RV "Corella" was used throughout the 1970s for pioneering studies on fish migration. Individual plaice ("Pleuronectes platessa") fitted with 300 kHz acoustic transponding
Orange-spotted trevally section being longer than the posterior straight section. The straight section of the lateral line has 14 to 26 scales followed by 20 to 30 scutes. The chest of the orange-spotted trevally is completely scaled, occasionally having a narrow naked region on the underside near the ventral fins. It has 24 vertebrae and 25 to 43 gill rakers. The orange-spotted trevally has a silvery grey- to brassy-coloured body, becoming paler to a silvery white ventrally. Many conspicuous orange to yellow spots occur on the sides of the fish, giving the species its name, and make for an easy way to