about 2000 islanders earn their living with tuna, including hearty matamaru.in charge of quality control at sol tuna. >> this cannery is really important to the people here. to their lives, to their families and to the surrounding communities as well. we are worried if the tuna stock is gone, because the job here depends very much on the fish that we have in our waters. >> the solomon islands' commercial fishing fleets net around 55 thousand tons a year. >> solomon emerald. solomon emerald. come in. >> captain petaia delaverata and his crew are all local. but they use fishing methods their ancestors wouldn't recognize. >> it's quite easier now when there is a school of fish 100 meters away. the sonar can tell you the density of the fish, how many tons there is, how deep it is and how far it is away from the boat. >> once the school of fish has been located, it's doomed. the crew get the nets in position, the trawler starts to circle, and moments later, the tuna are netted. it's so easy that it makes the captain uncomfortable. >> as a pacific islander myself, i