Opinion of Advocate General Rantos delivered on 16 November 2023.#T GmbH v Bezirkshauptmannschaft Spittal an der Drau.#Request for a preliminary ruling from the Verwaltungsgerichtshof.#Reference for a preliminary ruling – Environment – EU action in the field of water policy – Directive 2000/60/EC – Environmental objectives relating to surface water – Prevention of deterioration of the status of all bodies of surface water – Point 1.2.2 of Annex V – Definitions for ‘high’, ‘good’ and ‘moderate’ ecological status in lakes – Criteria for assessing the biological quality element ‘fish fauna’.#Case C-671/22.