Searching Spatial-Temporal Changes in Intrinsic Productivity of Antarctic Krill (Euphausia superba) in a Climate Change and Fishery Management Context

An approach for understanding the dynamics of krill populations in the Antarctic Peninsula (Subarea 48.1) is through the analysis of empirical data, such as size composition obtained from fishery monitoring. By studying this data over multiple years and considering life history parameters, we can assess the intrinsic productivity or Spawning Potential Ratio (SPR) of krill and potential changes over time and in different areas. To achieve this, we have employed the Length-Based Spawning Potential Ratio (LBSPR) model. This method allows us to estimate the reproductive potential of the population based on current exploitation levels, as well as its comparison to a virgin condition. By identifying reference points specifically related to reproductive potential, the LBSPR method provides insights about the state of the krill population facing changing environmental conditions. Recognizing spatial and temporal changes in the intrinsic productivity of krill, as indicated by their reproductive potential, is crucial for the understanding of the unique characteristics of this species. Moreover, these findings have important implications for management strategies within the context of the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR). By integrating knowledge of krill dynamics and its reproductive potential, advise can be produced to ensure the sustainable management of krill populations in Subarea 48.1.