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Glass Horizons
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GBBA Horizons
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Development, Implementation and Initial Testing of Candidate Management Procedures for the IJsselmeer/Markermeer
This report presents the work that was carried out in 2022 to develop a new set of candidate management strategies for the pikeperch, perch, bream and roach fisheries in the IJsselmeer – Markermeer complex. The management procedures proposed here are based on stock indicators that can be derived from the two main sources of data available for these stocks: 1) changes in abundance obtained from the scientific survey, and 2) landings quantities and composition from the commercial fisheries within the complex. The status indicators derived from these data are used in harvest control rules, set to propose a total allowable catch for the following year. These new developments build upon the experience from the previous Management Strategy Evaluation analysis (Tien et al. 2020a&b), and extends the set of options available. This report provides a brief demonstration of the application of the updated management tools on the pikeperch and bream operating models.
Development of Updated Operating Models for the IJsselmeer/Markermeer
This report presents the ongoing work and initial testing for the operating models (OM) utilized for the 2023 management strategy evaluation (MSE) analysis of four commercially important fish stocks (pikeperch, perch, bream, roach) within the IJssel/Markermeer complex. In recent years, these stocks have witnessed a concerning decline prompting the Ministry of Agriculture, Nature, and Food Quality to take management decisions based on the best available scientific information. With the goal of long term sustainability while allowing the highest possible commercial catches, an MSE analysis of the IJssel/Markermeer stocks was conducted in 2019/2020. Following the results of the previous MSE, an...
