<p>Parasites play a vital role in modulating the key life history events of marine species, which has been poorly covered amongst Antarctic fishes. This study thus investigated the effects of hepatic <i>Anisakidae</i> parasite infestation on energy allocation and survival-reproduction trade-off strategies in the females of endangered South Georgia icefish (<i>Pseudochaenichthys georgianus</i>) during the ovarian development period. The results showed that hepatic parasite density was significantly negatively correlated with gonadal energy density and muscle energy density, but not significantly correlated with liver energy density. Importantly, parasite density was also negatively associated with absolute tissue energy in gonad, muscle and liver, indicating an overall reduction in energy stores with increasing parasite density. The log-transformed ratio of muscle energy to gonad energy, as a proxy of allocation priority, showed a clear association with parasite density, but log-transformed ratio of liver to gonad exhibited no clear association with parasite density. Bayesian mediation analysis revealed that higher parasite density was associated with lower gonadal energy density, which in turn was linked to reduced reproductive investment (lower gonadosomatic index), and ultimately correlated with a higher log-transformed ratio of muscle energy to gonad energy. This pattern suggests a shift in host energy allocation strategy favoring somatic maintenance over immediate reproductive investment under parasitic stress.</p>