On many tinned fish packages, you'll see a reference to California Proposition 65. Sometimes, you'll even see a notation "Not for sale in California". This is similar to warnings on other products such as "Known to the state of California to cause cancer in laboratory animals", and the like. California is known for regulatory legislation which can often exceed the requirements set by federal agencies such as the FDA. Here's a breakdown of what Prop 65 entails and how it relates to the sale of tinned fish products in the US:
California's Proposition 65, formally known as the Safe Drinking Water and Toxic Enforcement Act of 1986, is a state law designed to protect California's citizens from exposure to chemicals that may cause cancer, birth defects, or other reproductive harm. The law requires businesses to provide “clear and reasonable” warnings before exposing individuals to such chemicals.
What Proposition 65 Requires
- The state maintains a list of chemicals known to cause cancer or reproductive toxicity.
- Businesses selling products in California must:
- Provide a warning label if their product contains a listed chemical above a certain threshold.
- Not discharge listed chemicals into sources of drinking water.
Relation to Tinned Fish
The link between Proposition 65 and tinned (canned) fish, such as tuna, sardines, or mackerel, mainly involves exposure to mercury and other heavy metals:
1. Mercury in Tuna
- Fish, especially larger predatory species like albacore and yellowfin tuna, can contain elevated levels of methylmercury.
- Methylmercury is listed under Proposition 65 as a chemical known to cause reproductive harm.
- Tinned tuna products sold in California may therefore require Prop 65 warning labels.
2. Other Contaminants
- Some canned fish may also contain trace levels of PCBs (Polychlorinated biphenyls), cadmium, or arsenic, which are also on the Prop 65 list.
Impact on Sale of Tinned Fish in the US
1. Labeling Requirements
- Companies that sell tinned fish nationwide often choose to include Prop 65 warnings on their packaging or websites, even outside California, to avoid the cost and complexity of separate labeling.
- This has led to consumer confusion or alarm in other states, despite the warning being a California-specific legal requirement.
2. Legal and Financial Risks
- Companies that fail to comply can face lawsuits and fines. Many businesses settle such cases out of court, which can be costly. Rather than face these risks, some companies simply choose to not do business in California.
3. Product Reformulation
- Some manufacturers attempt to source fish with lower mercury levels, change species, or adjust processing methods to reduce exposure and avoid needing a Prop 65 warning.
Public and Industry Reactions
- Health advocates support Prop 65 for raising awareness of toxic exposures.
- Food producers and retailers often criticize it for over-warning and scaring consumers when actual risk levels may be low.
- FDA vs Prop 65: The U.S. Food and Drug Administration (FDA) has its own mercury guidelines and recommends tuna consumption in moderation. Some argue that Prop 65 warnings conflict with federal dietary advice, particularly for pregnant women encouraged to eat low-mercury fish for omega-3s.
Summary
Proposition 65 affects tinned fish sales by:
- Requiring warnings on products with potentially harmful levels of mercury or other chemicals.
- Influencing national labeling practices.
- Posing legal risks for non-compliant companies.
- Creating tension between state and federal guidance.
Fish Species and Level of Risk
Here’s a breakdown of fish species commonly found in tinned products, ranked by their likelihood to trigger Proposition 65 warnings, primarily due to mercury content (but also considering other contaminants like PCBs and cadmium).
High Risk (More Likely to Require Prop 65 Warnings)
These fish are higher in the food chain and tend to accumulate more mercury:
| Fish Species | Notes |
|---|---|
| Albacore Tuna | Often sold as "white tuna"; higher mercury than light tuna. |
| Yellowfin Tuna | Similar to albacore; used in premium canned products. |
| Bigeye Tuna | High mercury; often found in sushi more than tins, but still relevant. |
| Mackerel (King) | Not the same as Atlantic mackerel; King mackerel is very high in mercury. |
| Shark or Swordfish (rare in cans) | Extremely high in mercury; usually not sold canned but relevant if imported. |
Moderate Risk (May Require Warning, Depending on Source)
These species have moderate levels of mercury or other Prop 65-listed chemicals:
| Fish Species | Notes |
|---|---|
| Skipjack Tuna | Often sold as “light tuna”; lower mercury than albacore, but still monitored. |
| Pacific Mackerel | Lower mercury than king mackerel, but sometimes confused with it. |
| Chub Mackerel | Often used in tinned products; varies in mercury by region. |
| Anchovies (large) | Generally low in mercury but may carry PCBs depending on harvest region. |
Low Risk (Unlikely to Require Prop 65 Warning)
These fish are small, short-lived, and low on the food chain, so they accumulate far fewer toxins:
| Fish Species | Notes |
|---|---|
| Sardines | Low in mercury; high in omega-3s and calcium. Rarely trigger Prop 65 labels. |
| Herring | Similar profile to sardines; low toxin accumulation. |
| Anchovies (small) | Very low mercury; often exempt from Prop 65 warnings. |
| Salmon (canned) | Wild-caught is low in mercury; farmed salmon may raise PCBs but generally below Prop 65 limits. |
Important Notes:
- Warning requirements depend on mercury levels, not the species alone. Even a typically low-mercury fish could trigger a warning if contamination occurs.
- California lawsuits have forced many tuna brands to include warnings—even when federal agencies like the FDA or EPA consider the mercury level safe.
- Some companies now test batches and label selectively, depending on mercury content.