Sharks

A chance find by a woman walking on a Northland beach is now helping scientists learn more about mako sharks.
As part of a Pacific-wide study, NIWA is measuring the survival rate of sharks returned to the sea by commercial tuna fishers.
NIWA has developed a new method for spatially-explicit, quantitative, sustainability risk assessment of pelagic shark population.
Sharks are vulnerable to overfishing because of their low reproductive rates and often low growth rates. Tuna longline fisheries, which operate mainly in oceanic waters beyond the continental shelves that surround land masses, catch many pelagic (open-ocean) sharks, including shortfin mako sharks (Isurus oxyrinchus). Most pelagic sharks fall near the middle of the shark productivity scale, and there is concern that catching too many of them could lead to population depletion. In New Zealand waters, mako sharks are the second most commonly caught shark species (after blue sharks) on tuna longlines. They are not targeted but are taken as bycatch.
Warrick Lyon is heading to the Marshall Islands to teach fisheries observers how to tag sharks.
Over the last few days the “dive team” have been recording corals, fishes, urchins and other invertebrates from the shallow waters (0-30m) surrounding Raoul Island to complement the biodiversity records from the deeper ocean collected by the other scientists onboard.
People fishing in the Bay of Islands are being asked to keep a look out for a young hammerhead shark, nicknamed Orokawa.

The broadnose sevengill shark, Notorynchus cepedianus, is named descriptively after – wait for it– its broad snout and seven gill slits! Interestingly, most shark species only have five gills. The broadnose sevengill is one of New Zealand's more common inshore sharks.

Great white sharks - sighted, tagged and tracked

Scientists from DOC, NIWA, and the University of Auckland are building a unique picture of New Zealand's great white shark population. Data gathered from the tagging programme is improving our understanding of their habitat requirements, the size of the population, and migration patterns.

Dr Malcolm Francis talks about this project, which is jointly funded by the Ministry of Science and Innovation and the Department of Conservation. 

Welcome to NIWA's third Alumni Update – an e-newsletter for past NIWA employees.

The rig shark can be found all around New Zealand at this time of year, from spring to summer. It is found in coastal waters, estuaries and inlets, down to a depth of 200 metres.

The return of the upgraded RV Tangaroa represents a huge advancement for New Zealand science and exploration

NIWA today welcomed home RV Tangaroa, New Zealand’s only deepwater research vessel, after a $20 million dollar upgrade to enhance its ocean science and survey capabilities.

Welcome to NIWA's second Alumni Update – an e-newsletter for past NIWA employees.

If you’re surfing the North Island beaches this summer don’t be surprised if the sleek bronze body next to you riding the waves is that of a bronze whaler shark.

A New Zealand great white shark has set a world record for the deepest ever known dive of 1200 metres.

An international team of marine scientists returns to the Chatham Islands next week hoping to fit satellite tags on up to 13 great white sharks. The tags will allow the scientists to track the sharks' movements for up to nine months.

 
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