{
  "version": "1.0",
  "checked": "2026-10-21",
  "scope": "Focused secondary case study, not an original reef experiment, systematic review, pooled meta-analysis or net Gulf production estimate.",
  "sources": [
    {
      "id": "streich2017",
      "url": "https://www.sportfishcenter.org/sites/default/files/2018-08/Effects%20of%20a%20New%20Artificial%20Reef%20Complex%20on%20Red%20Snapper%20and%20the%20Associated%20Fish%20Community%20an%20Evaluation%20Using%20a%20Before%20After%20Control%20Impact%20Approach.pdf",
      "doi": "10.1080/19425120.2017.1347116",
      "read_scope": "Full main-paper methods/results/discussion; Table1 visually audited p409",
      "rights": "CC BY4.0; factual extraction and original figures with attribution",
      "design": "One reef complex and one bare control near Port Aransas, Texas,22m depth; vertical line before1year/after2years; traps began only2months before deployment; seasonal/monthly sampling,2012\u20132015. No directly measured survival or confirmed adult export."
    },
    {
      "id": "gardner2022",
      "url": "https://repository.library.noaa.gov/view/noaa/36946/noaa_36946_DS1.pdf",
      "doi": "10.3389/fmars.2022.772292",
      "read_scope": "Full main-paper methods/results/discussion; Table3 visually audited p9 and Table4 p10",
      "rights": "CC BY; public aggregate facts only, no individual tracks",
      "design": "Linked commercial vertical-line VMS/TIP trips in2011,2012,2018,2019;250m habitat buffer; equal landings per identified fishing event, then unknown-habitat allocation based on each trip\u2019s known habitat proportions. No recreational fleet estimate or production measurement."
    },
    {
      "id": "czaja2025",
      "url": "https://repository.library.noaa.gov/view/noaa/70807/noaa_70807_DS1.pdf",
      "doi": "10.1111/faf.12906",
      "read_scope": "Review/perspective framing and inference/design discussion inspected; secondary-production table not extracted",
      "rights": "CC BY-NC. Cited for research framing only; no adapted figures, table, rates, text or republished dataset."
    }
  ],
  "red_snapper_arms": [
    {
      "gear": "Vertical line",
      "unit": "fish/set",
      "site": "Control",
      "period": "Before",
      "mean": 0,
      "se": 0,
      "n": 11
    },
    {
      "gear": "Vertical line",
      "unit": "fish/set",
      "site": "Control",
      "period": "After",
      "mean": 0,
      "se": 0,
      "n": 33
    },
    {
      "gear": "Vertical line",
      "unit": "fish/set",
      "site": "Reef",
      "period": "Before",
      "mean": 0,
      "se": 0,
      "n": 12
    },
    {
      "gear": "Vertical line",
      "unit": "fish/set",
      "site": "Reef",
      "period": "After",
      "mean": 3.424,
      "se": 0.753,
      "n": 33
    },
    {
      "gear": "Fish trap",
      "unit": "fish/trap-hour",
      "site": "Control",
      "period": "Before",
      "mean": 0.014,
      "se": 0.01,
      "n": 27
    },
    {
      "gear": "Fish trap",
      "unit": "fish/trap-hour",
      "site": "Control",
      "period": "After",
      "mean": 0.002,
      "se": 0.002,
      "n": 99
    },
    {
      "gear": "Fish trap",
      "unit": "fish/trap-hour",
      "site": "Reef",
      "period": "Before",
      "mean": 0.015,
      "se": 0.01,
      "n": 27
    },
    {
      "gear": "Fish trap",
      "unit": "fish/trap-hour",
      "site": "Reef",
      "period": "After",
      "mean": 0.455,
      "se": 0.091,
      "n": 99
    }
  ],
  "commercial_landings": [
    {
      "year": 2011,
      "natural": 0.29,
      "artificial": 0.17,
      "unknown": 0.54,
      "extrapolated_natural": 0.69,
      "extrapolated_artificial": 0.31
    },
    {
      "year": 2012,
      "natural": 0.21,
      "artificial": 0.24,
      "unknown": 0.55,
      "extrapolated_natural": 0.54,
      "extrapolated_artificial": 0.46
    },
    {
      "year": 2018,
      "natural": 0.19,
      "artificial": 0.3,
      "unknown": 0.51,
      "extrapolated_natural": 0.5,
      "extrapolated_artificial": 0.5
    },
    {
      "year": 2019,
      "natural": 0.19,
      "artificial": 0.28,
      "unknown": 0.53,
      "extrapolated_natural": 0.51,
      "extrapolated_artificial": 0.49
    }
  ],
  "reported_gulf_mean": {
    "natural": 0.22,
    "artificial": 0.25,
    "unknown": 0.53,
    "extrapolated_natural": 0.54,
    "extrapolated_artificial": 0.46,
    "reported_ci_halfwidth": {
      "natural": 0.07,
      "artificial": 0.09,
      "unknown": 0.03,
      "extrapolated_natural": 0.14,
      "extrapolated_artificial": 0.14
    },
    "interval_note": "Source Table3 mean \u00b195% confidence interval; copied, not independently refitted; not full uncertainty from mapping and allocation assumptions."
  },
  "louisiana_extrapolated_landings": [
    {
      "year": 2011,
      "artificial": 0.66,
      "natural": 0.34
    },
    {
      "year": 2012,
      "artificial": 0.74,
      "natural": 0.26
    },
    {
      "year": 2018,
      "artificial": 0.74,
      "natural": 0.26
    },
    {
      "year": 2019,
      "artificial": 0.75,
      "natural": 0.25
    }
  ],
  "reported_louisiana_mean_artificial": 0.73,
  "linked_trips": 1866,
  "louisiana_linked_trips": 424,
  "reef_age_growth_regression": {
    "slope_mm_per_year": 124.1,
    "note": "Published cross-sectional size-at-age regression, not measured growth of individually tracked fish or a control-adjusted growth treatment effect."
  },
  "evidence_map": [
    {
      "endpoint": "Local catch rate / relative abundance",
      "finding": "Strong increase at the new reef compared with the bare control",
      "basis": "Streich et al. (2017): controlled before/after sampling",
      "boundary": "Baited-gear CPUE, one reef/control pair; not regional population abundance"
    },
    {
      "endpoint": "Juvenile habitat value",
      "finding": "Size/age progression, condition and growth consistent with a nursery contribution",
      "basis": "Streich et al. (2017): age/size and condition records",
      "boundary": "Survival and export not directly measured; cannot isolate growth from movement"
    },
    {
      "endpoint": "Fishing concentration",
      "finding": "Substantial estimated commercial removals assigned to artificial structures",
      "basis": "Gardner et al. (2022): VMS/TIP habitat allocation",
      "boundary": "Assumptions, unknown habitat and uneven port sampling; not a catch probability"
    },
    {
      "endpoint": "Net regional production",
      "finding": "Not estimated by either quantitative case here",
      "basis": "Requires recruitment, growth, survival, movement and removals across the wider system",
      "boundary": "Neither a reef fish count nor landings share settles this endpoint"
    }
  ]
}