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Grand River — fish advisory record

21species with an advisory recorded
9contaminants named
554advisory rows on file

below Dunnville Dam to Port Maitland |en aval du barrage Dunnville jusqu'à Port Maitland

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.

Advisory recorded for this waterbody, by species
SpeciesContaminant recordedLength categoriesPopulation groups
Black CrappieMercury PFAS Precautionary6General, Sensitive
BluegillPFAS1General, Sensitive
Brown BullheadMercury Mercury, PCB Mercury, PFAS PFAS Precautionary5General, Sensitive
Brown TroutMercury PCB6General, Sensitive
Channel CatfishMercury Mercury, PCB, PFAS Mercury, PFAS PCB PCB, PFAS PFAS13General, Sensitive
Common CarpDioxins/Furans Mercury Mercury, PCB Mercury, PFAS PCB PCB, PFAS PFAS12General, Sensitive
Freshwater DrumMercury Mercury, PFAS PFAS12General, Sensitive
Gizzard ShadPCB2General, Sensitive
Largemouth BassMercury Mercury, PFAS PFAS6General, Sensitive
Longnose GarMercury1General, Sensitive
Northern PikeMercury Mercury, PCB PCB PFAS10General, Sensitive
PumpkinseedMercury PFAS Precautionary1General, Sensitive
Rainbow TroutPCB8General, Sensitive
Redhorse SuckerMercury Mercury, PCB PCB PFAS Precautionary8General, Sensitive
Rock BassMercury PFAS Precautionary2General, Sensitive
Smallmouth BassMercury Mercury, PCB Mercury, PFAS PFAS Precautionary7General, Sensitive
WalleyeMercury, PFAS PFAS10General, Sensitive
White BassPFAS1General, Sensitive
White PerchPFAS1General, Sensitive
White SuckerMercury PFAS Precautionary6General, Sensitive
Yellow PerchMercury PFAS2General, 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.

Advisory rows by contaminantThe contaminants the advisories for this waterbody are recorded against.0100200300400500Dioxins/Furans: 3Dioxins/FuransMercury: 80MercuryMercury, PCB: 12Mercury, PCBMercury, PCB, PFAS: 2Mercury, PCB, Mercury, PFAS: 24Mercury, PFASPCB: 71PCBPCB, PFAS: 10PCB, PFASPFAS: 330PFASPrecautionary: 22PrecautionarySource: Guide to Eating Ontario Fish advisory database, Ontario.

Scroll the chart sideways to see all of it.

Source: Ontario — Guide to Eating Ontario Fish: Advisory Database.

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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.