Scientists from New Zealand’s NIWA have trawled deeper than ever before - down to 2,730 metres - and found new-to-science fish close to the deep ocean seafloor during their latest research voyage.
Working from the research vessel Tangaroa, the scientists explored the deepest ocean to increase their knowledge of fish distribution, abundance, and ecology.
The eight deepest-ever fish trawls carried out by NIWA sampled depths from 1,910-2,730m, northwest of the Graveyard Hills on the north Chatham Rise.
Below 2,100m, the scientists found that there weren’t many fish; only a small numbers of skates, slickheads, rattails, and cusk-eels were caught there.
The trawls revealed truly fantastic looking new-to-science and rare fishes: a flabby whalefish, three new slickheads, a juvenile Richardson’s skate, large warty cusk-eel, new record of a white rattail, and several unidentified fishes .
NIWA fisheries scientist Peter McMillan says, “We were fortunate to get an opportunity to explore this deep area on the Chatham Rise. It’s great to know what we have, and how much.”
To send a net to the bottom of the sea floor at 2,000m and get it back can take three hours or more. Deepsea fish often appear to have bizarre body forms compared with the more commonly studied inshore fishes.
Shortly after the fish are brought up from the depths of the ocean, NIWA scientists take photos of the fish to capture their fresh colour. The catch from each station is recorded and then specimens are labelled and frozen.
NIWA gifts the rare and the new-to-science fish at Te Papa where they are preserved, researched and stored in the National Fish Collection.
In the Fishes Collection at Te Papa, preserved fish specimens are held from 28 sites below 2,000m. Of these, 120 specimens covering 34 species are represented. The majority were caught by the New Zealand Oceanographic Institute and, more recently, by NIWA.
