87It should be noted in that regard that whilst the possibility of relying on the protection of legitimate expectations, as a fundamental principle of Union law, is available to any economic operator whom an institution has caused to have justified expectations, the fact remains that, where a prudent and circumspect economic operator is able to foresee the adoption of a measure likely to affect his interests, he cannot plead that principle if the measure is adopted. Furthermore, economic operators are not justified in having a legitimate expectation that an existing situation which is capable of being altered by the Union institutions in the exercise of their discretionary power will be maintained. This is particularly true in an area such as the common fisheries policy, the objectives of which require constant adjustments in order to meet changes in economic circumstances (see, to that effect, Case C-201/08 Plantanol [2009] ECR I-8343, paragraph 53, and the case-law cited, and AJD Tuna, paragraph 84 above, paragraph 73; Case T-415/03 Cofradía de pescadores ‘San Pedro de Bermeo’ and Others v Council [2005] ECR II-4355, paragraph 78).
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