biker there is no way they can get this sort of quantity from the Hoki fishery. To give you an idea, on a recent trip of a Hoki factory trawler, around 1,800 tonnes of Hoki were caught. During the trip, they produced 68,000 ltrs of fish oil. I understand this was their best oil production in any 1 trip ever.
Some trawlers mix their fish oil with the fuel on their engines and will continue to do so as it is economical and reduces emission footprints.
Some of the Hoki is processed in onshore factories that do not extract oil. Another proportion of it is headed & gutted and then frozen onboard for further processing in China.
I therefore do not think it will be easy (or even possible) or cheap for them to source 5000t of oil from around the NZ fishing industry, not in the near future anyway.