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Kildin cod is a small landlocked population of Atlantic cod reproductively isolated from marine counterparts for around 1500-2000 years. The Kildin cod lives in a shallow meromictic lake in the five-meter intermediate layer of water with sharp gradients of oxygen and salinity. The cod had an effective population size of around one hundred individuals and evolved unique physiological, morphological and behavioral features. The marine Atlantic cod has two ecologically distinct forms: thedoi:10.7287/peerj.preprints.2497v1 fatcat:xpk2bmshvzgsnog4tzc6i6xtve