The paper presents a system dynamics theory of the influence of the Earth's nutation on management of Northeast arctic cod. According to this theory the Earth's axis dynamically behaves as a forced oscillator on a non-linear sea system that modulates a set of harmonic and sub harmonic low frequency temperature cycles in the sea system. The paper reports a correlation between time harmonic cycles of the 18.6 year Earth nutation and the temperature system and the biological system in the Barents Sea. The influence from the Earth nutation is explained by a general systems theory where modulated temperature cycles are forced oscillators on the biological system in the Barents Sea. The system dynamics of the biological system are synchronized to the temperature cycle and amplified by a biological stochastic resonance to the food systems. A stochastic resonance of 18.6/3=6.2 yr between the management and the biomass dynamics introduces an unstable biomass.
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