Biological and physical data used for analysis of daily juvenile Pacific Cod growth in relation to Marine Heatwaves, 2007-2019

Data include the estimate age, hatch date, and daily growth data for juvenile Pacific Cod collected on Kodiak Island as well as daily interpolations of bottom and surface water temperatures from the GAK1 hydrographic station. Fish were collected as part of the Kodiak Island Beach Seine Survey conducted by the National Oceanic and Atmospheric Administration’s (NOAA) Alaska Fisheries Science Center (AFSC). Surveys occurred in Anton Larsen Bay and Cook Bay. Data for fish collected during 2007, 2009, 2010, 2012-2019 are included. Sampling occurred at 16 sites spread evenly across Anton Larsen Bay and Cook Bay, with sites sampled each day on two successive days in most years. At each site, a 36 meter demersal beach seine was deployed from a boat and pulled to shore by two people standing a fixed distance apart. The seine was 1 meter deep with 13-millimeter mesh at the wings, expanding to 2.25 meter in the middle with a 5-millimeter delta mesh in a bag-end. Seine sites were 2-4 meter deep and were mostly sampled within 2 hours of low tide. Juvenile Pacific Cod within each haul were identified, counted, measured (total length, mm), and then frozen at -20 °C.