This project evaluates the potential effects of ocean acidification and other environmental co-stressors on fish populations. The effects on fish of an increased level of ocean acidification –another consequence of C02 emissions – are largely unknown and represent a new and exciting research front. We are using a combination of field, laboratory, and experimental data to address this topic with respect to resource fish species of the northeastern USA. The student will be directly involved in laboratory experiments that address components of this larger research effort. Among other activities in 2019, we will be conducting experiments on the direct and interactive effects of C02 (acidity), dissolved oxygen (DO), and thermal regimes on embryos and larvae of fish or shellfish, and assessing the adaptive potential of the fish species to these stressors. Candidate species for 2019 include summer flounder, winter flounder, Atlantic silverside, Atlantic killifish, and horseshoe crab. Response metrics of special interest this year are growth, development, metabolic and consumption rates, behavioral responses, and predation risk.