Hatching in zebrafish (Danio rerio) embryos exposed to a 50 Hz magnetic field.

{
  "study_type": "animal",
  "exposure": {
    "band": "ELF",
    "source": null,
    "frequency_mhz": 0.05,
    "sar_wkg": null,
    "duration": null
  },
  "population": "Zebrafish (Danio rerio) embryos (intra ovo)",
  "sample_size": null,
  "outcomes": [
    "Hatching timing/progress (asynchronous hatching delay)"
  ],
  "main_findings": "Zebrafish embryos exposed intra ovo to a 50 Hz AC magnetic field (1000 microT rms) showed a statistically significant delay in hatching when exposure began 48 hours after fertilization. When exposure began 2 hours after fertilization, no statistically significant effect on hatching was observed. Co-exposure with submaximal progesterone doses at 48 hours postfertilization appeared to delay hatching additively.",
  "effect_direction": "mixed",
  "limitations": [
    "Sample size not reported in abstract",
    "Exposure duration and other exposure parameters beyond frequency and field strength not reported in abstract",
    "Only hatching progress assessed; broader reproductive/developmental endpoints not described in abstract"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "zebrafish",
    "Danio rerio",
    "embryo",
    "hatching",
    "50 Hz",
    "AC magnetic field",
    "ELF",
    "1000 microT",
    "progesterone",
    "development"
  ],
  "suggested_hubs": [
    {
      "slug": "elf-emf",
      "weight": 0.9,
      "reason": "Animal experiment with 50 Hz magnetic field exposure."
    },
    {
      "slug": "reproduction-development",
      "weight": 0.6,
      "reason": "Outcome relates to embryonic development/hatching."
    }
  ]
}