Simulation Model Evaluation of Some Fisheries Balance Indicators

摘要: Chronic overcapacity has been identified as a major cause of the overfishing Europe’s fish stocks and poor economic performance European fishing fleets. Mechanisms are needed to ensure that capacity fleets remain proportionate available stocks. To end, Commission developed “Guidelines for an improved analysis balance between opportunities”, which specify minimum set fleet-based technical, biological, economic, social indicators purportedly measure resources. A bioeconomic simulation model was assist in evaluation some these indicators. The is age-structured, like standard single-species stock assessment models, but accommodates multiple independent harvested by occupy spatial regions with diffusion regions. choose where how based on anticipated profits. Randomness included simulated system annual recruitments their distribution. used generate series were then compared against true conditions fisheries evaluate whether provide accurate signals status. simulations showed randomness recruitment propagates directly into implying it will be difficult detect meaningful from any short time indicator values.