This dataset contains AI-based fish detections at the OBSEA Underwater Observatory (NW Mediterranean sea). The model is a YOLOv8 xlarge trained with labeled underwater pictures from OBSEA. The model can be found here. The pictures where taken at OBSEA area with cameras pointing to an artifical biotop developed in the framework of the Slagreef project. aritificial concrete biotop located in the OBSEA area. The time coverage of the dataset is from 2023-07-16 to 2025-02-24. The data file in CSV format includes the following columns: timestamp: Time instance when the picture was taken (in UTC) SourceImage: URL of the source image ProcessedImage: URL of the processed image with detections + bounding boxes SENSOR_ID: Name of the camera that took the picture Diplodus puntazzo: Number of s Oblada melanurus: Number of specimens detected Parablennius gattorugine: Number of specimens detected Sarpa salpa: Number of specimens detected Seriola dumerili: Number of specimens detected Serranus cabrilla: Number of specimens detected Sparus aurata: Number of specimens detected Symphodus mediterraneus: Number of specimens detected Diplodus sargus: Number of specimens detected Diplodus vulgaris: Number of specimens detected Epinephelus costae: Number of specimens detected Aetomylaeus bovinus: Number of specimens detected Chromis chromis: Number of specimens detected Coris julis: Number of specimens detected Dentex dentex: Number of specimens detected Diplodus cervinus: Number of specimens detected Epinephelus marginatus: Number of specimens detected Mullus surmuletus: Number of specimens detected Muraena helena: Number of specimens detected Oblada melanurus: Number of specimens detected Parablennius gattorugine: Number of specimens detected Sarpa salpa: Number of specimens detected Seriola dumerili: Number of specimens detected Serranus cabrilla: Number of specimens detected Sparus aurata: Number of specimens detected Symphodus mediterraneus: Number of specimens detected