{
  "title": "Commercial fishing deck video for AI catch review",
  "source_page": "https://fiund.com/industries/finfish-deck-video-data",
  "authorship": "Original fictional Fiund editorial exercise. No actual operating records or third-party source assets are included.",
  "example": {
    "title": "Reappearance after an occlusion does not automatically add another fish",
    "context": "A staged prop sequence has original frame and track annotations. It represents neither a real catch nor regulated monitoring footage and cannot support a species or vessel assessment.",
    "records": [
      [
        "FD1",
        "Frames 1–2",
        "Prop fish F1 visible in frame 1; frame 2 shows F1 partly behind a box. Reviewer confirms continuity."
      ],
      [
        "FD2",
        "Frames 3–4",
        "F1 reappears with a reviewer-confirmed track link. Another similar prop F2 overlaps it in frame 4; identities remain distinct in the review key."
      ],
      [
        "FD3",
        "Frame 5",
        "One blurred fish-like shape lacks sufficient features for identity or species. Detector fixture gives one detection but no supported track link."
      ]
    ],
    "question": "How many confirmed unique prop identities appear in frames 1–4, and can frame 5 be added as another fish or assigned a species?",
    "answer": "FD1 and FD2 establish two unique prop identities, F1 and F2, across frames 1–4. F1's reappearance is a continuation, not another individual. FD3 adds an unresolved detection without identity or species evidence, so it cannot automatically increase the confirmed unique count or receive a species label. Preserve detection, track association and classification as separate outputs rather than deriving a catch total by adding frame detections.",
    "failureModes": [
      "Counting every frame appearance as a distinct fish.",
      "Forcing a track or species assignment when the reviewer marks the image insufficient."
    ],
    "fields": [
      [
        "Frame time and detection region",
        "Localizes the visible item."
      ],
      [
        "Track ID and association confidence",
        "Supports unique-object counting."
      ],
      [
        "Occlusion and species-review state",
        "Records unresolved visual evidence."
      ]
    ],
    "holdout": "Introduce two identical props crossing behind an opaque screen with no continuity evidence. Require uncertain post-occlusion identities instead of assumed tracks.",
    "boundary": "Use staged props or separately cleared historical footage. Exclude vessel and crew identities, positions and regulated recordings; monitoring agreements may control reuse."
  }
}