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
Pinnoctopus cordiformis appear to be consistent differences between specimens identified as "P. cordiformis" and those identified as "O. maorum" which suggests that there is a second species but this species more closely resembles a species of the genus "Enteroctopus", with the description closely resembling "Enteroctopus zealandicus". The name "the name Pinnoctopus cordiformis" is regarded as unresolved, a "nomen dubium", by some authorities. Pinnoctopus cordiformis Pinnoctopus cordiformis is a species of octopus found around the coasts of New Zealand. "Pinnoctopus cordiformis" is identifiable by their orange-brown or purple-grey colouration; iridescent white spots are also found on the arms and web. No white spots