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The fish we collected were measured and weighed. Samples were taken from each fish including fin clips for genetic analysis, the inner ear bone (i.e. otolith) of the fish for chemical analysis, and photos were captured for body shape analysis. Genetic analysis will provide information on the membership of fish in a spawning group and the genetic variation and adaptations of these groups. A combination of otolith chemistry and body morphometrics analysis will be used to characterize spatial behavior and life history of fish (resident vs. migratory).

Image of Cod otolith (inner ear bone) section from cod collected in the Gulf of Maine, black dots denote annual growth bands (source). Illustration of Cod showing landmarks and measurements to be used in body shape analysis.