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In the coming decades, environmental change like warming and acidification will affect life in the ocean. While data on single stressor effects on fish are accumulating rapidly, we still know relatively little about interactive effects of multiple drivers. Of particular concern in this context are the early life stages of fish, for which direct effects of increased CO 2  on growth and development have been observed. Whether these effects are further modified by elevated temperature was investigated here for the larvae of Atlantic herring ( Clupea harengus ), a commercially important fish species. Over a period of 32 days, larval survival, growth in size and weight, and instantaneous growth rate were assessed in a crossed experimental design of two temperatures (10°C and 12°C) with two CO 2  levels (400  μ atm and 900  μ atm CO 2 ) at food levels mimicking natural levels using natural prey. Elevated temperature alone led to increased swimming activity, as well as decreased survival and instantaneous growth rate (G i ). The comparatively high sensitivity to elevated temperature in this study may have been influenced by low food levels offered to the larvae. Larval size, G i  and swimming activity were not affected by CO 2 , indicating tolerance of this species to projected "end of the century" CO 2  levels. A synergistic effect of elevated temperature and CO 2  was found for larval weight, where no effect of elevated CO 2  concentrations was detected in the 12°C treatment, but a negative CO 2  effect was found in the 10°C treatment. Contrasting CO 2  effects were found for survival between the two temperatures. Under ambient CO 2  conditions survival was increased at 12°C compared to 10°C. In general, CO 2  effects were minor and considered negligible compared to the effect of temperature under these mimicked natural food conditions. These findings emphasize the need to include biotic factors such as energy supply via prey availability in future studies on interactive effects of multiple stressors.

Growth performance and survival of larval Atlantic herring, under the combined effects of elevated temperatures and CO2