North sea herring populations have undergone dramatic shifts between 1960-2008, most noticeably between 1970-1979 where a decrease in egg laying and anomalous Atlantic current led to a crash of recruitment rates \cite{Turrell_1992,HUTCHINGS_2004}. Since recovery, recruitment rates of herring have consistently decreased, which if allowed to continue will reach 1976 recruitment levels by 2047 \cite{Corten_2012}