Thunder Bay (Lake Superior) — fish advisory record
North of Pie Island|Au nord de l'île Pie
This site does not tell you how much fish to eat
The Guide to Eating Ontario Fish publishes, for each waterbody, species and size, how many meals of that fish are advised. Those meal numbers are not reproduced here, and this site does not give consumption advice.
The reason is specific. The published data records the advisory as a numeric code whose meaning is defined in the Guide's own codebook. Turning that number into "so many meals a month" without the codebook would be this site inventing health advice from a number it cannot read — and if it read the number wrongly, it would be telling people the wrong thing about fish they are about to eat.
So this site does the part it can do from the record alone: it tells you whether a waterbody carries an advisory, for which species, and which contaminant the advisory is named against. Then it hands you to the publisher for the numbers.
For the actual advice, read the guide: Guide to Eating Ontario Fish on ontario.ca. It is the authority. This site is not, and nothing here should be used as a substitute for it.
Species with an advisory recorded
For each species, the contaminants the advisory is recorded against, how many length categories are covered, and which population groups the Guide publishes a separate advisory for.
| Species | Contaminant recorded | Length categories | Population groups |
|---|---|---|---|
| Burbot (Ling) | Mercury Mercury, PFAS PFAS | 12 | General, Sensitive |
| Chinook Salmon | Mercury, PFAS PCB PFAS | 11 | General, Sensitive |
| Cisco (Lake Herring) | Mercury Mercury, PCB, PFAS PCB, PFAS | 6 | General, Sensitive |
| Lake Trout | PCB PFAS | 11 | General, Sensitive |
| Lake Whitefish | PCB PCB, PFAS PFAS | 7 | General, Sensitive |
| Longnose Sucker | Mercury, PFAS PFAS | 7 | General, Sensitive |
| Northern Pike | Mercury Mercury, PFAS | 12 | General, Sensitive |
| Rainbow Smelt | PFAS | 1 | General, Sensitive |
| Rainbow Trout | Mercury, PFAS PFAS | 4 | General, Sensitive |
| Redhorse Sucker | Mercury | 3 | General, Sensitive |
| Rock Bass | Mercury | 1 | General, Sensitive |
| Round Whitefish | Mercury Mercury, PFAS PFAS | 8 | General, Sensitive |
| Smallmouth Bass | Mercury, PFAS PFAS | 5 | General, Sensitive |
| Walleye | Mercury Mercury, PFAS PFAS | 11 | General, Sensitive |
| White Sucker | Mercury Mercury, PFAS PFAS | 9 | General, Sensitive |
| Yellow Perch | Mercury | 5 | General, Sensitive |
The number of meals advised for each of these is in the Guide to Eating Ontario Fish — not on this page, and not on this site.
Contaminants recorded
The contaminants this waterbody's advisories are recorded against. This counts advisory rows, not risk.
Scroll the chart sideways to see all of it.
Source: Ontario — Guide to Eating Ontario Fish: Advisory Database.
Privacy
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About this record
Which Ontario lakes and rivers carry a fish consumption advisory, for which species, and which contaminant the advisory is recorded against. The guide that publishes the meal advice is linked on every page.
Source: Ontario — Guide to Eating Ontario Fish: Advisory Database — Open Government Licence – Ontario. Data refreshes as published. Every page links the row it came from.
What this site is not. It is a copy of an official record. It is not a judgement about any business, building or person, and it is not advice. If the record is wrong, the source above is where it is corrected.