man: "solomon emerald," "solomon emerald," copy. narrator: fishmaster junior delaverata grew up in the solomons and commands a crew of his fellow islanders. he says technology has become an essential tool in the boat cockpit. delaverata: it's quite easier now. when there's a spot of fish 100 meters away, the sonar can tell you the density of fish, how many tons there is, how deep it i and howar it is. narrator: it's not long before a large school of tuna are spotted. and the crew races to lay nets and gather the catch. before long, hundreds of tons of tuna start coming up over the rail. but this kind of modern technology is a double-edged sword. delaverata: as a pacific islander myself, i would ask one question--will the next generation enjoy this industry as we do now? it's so very easy to catch fish. that's the worrying part. more boats, more fish harvested from the sea. narrator: for now, the western and central pacific is still the most productive fishery on the planet. but the risk of depleting stocks of tuna sends a signal tha