300-gallons integrated seaweed tanks.
Mike Graham and Scott Hamilton received funding from NOAA Sea Grant to investigate how integrated multi-trophic aquaculture of seaweeds and shellfish (oysters and abalone) may potentially mitigate the negative effects of ocean acidification on shellfish growth. Changing ocean pH is having negative impacts on oyster growers in the Pacific Northwest, and potentially on any shellfish growers, especially at the hatchery/nursery scale. Seaweeds, however, thrive off increased carbon dioxide and can buffer ocean acidification. We have added 24 new 300-gallon tanks to create a replicated design to assess the effectiveness of various species of seaweed in mitigating different acidification scenarios on the growth and health of shellfish. In addition to providing much needed experimental scientific information on the effects of ocean acidification on shellfish hatcheries/nurseries, this project may demonstrate the utility of land-based integrates seaweed-abalone farms for expansion of the shellfish industry in California.
Scott Hamilton has received funding from NSF, NOAA Saltonstall-Kennedy, and California Sea Grant to assess the impacts of ocean acidification (OA) and hypoxia on temperate fishes. Current work involves studying how these climate change stressors can (1) affect reproduction and embryo development in multiple species of groundfish and (2) impact the behavior and physiology of juvenile fishes. We have added a new trailer with computer controls to allow precise control of pH and dissolved oxygen in 24 new tanks to assess the impacts of changing ocean chemistry on commercially important fishes.
(A) Normal gopher rockfish larva at birth, gestated in ambient oxygen conditions (i.e., normoxia = 8 mg L-1 dissolved oxygen). (B) Deformed larva gestated in low oxygen conditions of 4.0 mg L-1 dissolved oxygen, showing enlarged heart, pericardial edema, and enlarged gut cavity.