Reason: Large predator → accumulates mercury; also overfished in some regions.
Alternative: Anchovies, mackerel (sustainably sourced).
3. King Mackerel
Reason: High mercury content.
Alternative: Smaller mackerel species.
4. Tilefish (Gulf of Mexico)
Reason: Mercury contamination.
Alternative: Salmon (wild-caught or responsibly farmed).
5. Orange Roughy
Reason: Extremely long-lived fish → high mercury; overfishing risk.
Alternative: Pacific sardines, trout.
6. Bigeye Tuna
Reason: Mercury levels high; overfished in some areas.
Alternative: Skipjack tuna (lower mercury, sustainably fished).
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