. >> terry sawyer is the main man here at hog island oyster farm. he's also had to learn a lot of chemistry and marine science, just to survive. >> what we're seeing is all the larvae or the juvenile oysters... the entire populations are crashing, they're dying. it's alarming to say the least. >> as techknow first reported in 2013, ocean acidification is caused by the addition of carbon gasses in the ocean. that's caused an increase the presence of carbonic acid, leaving shellfish like oysters less calcium carbonate, the key ingredient needed to form their shells. it hits the oyster crop hardest when they are young and fragile, but even the more mature oysters that fill the beds out in the bay are vulnerable. we've come back to the bay to see if anything has changed. >> hey guys. >> sawyer met us at the shoreline. he had a boat waiting. >> so this is a hog island boat? >> this is one of our harvest vessels. >> we're heading out onto the bay to check out a potential solution tessa and the uc davis team is researching. >> is this prime time for sea gr