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Perch
Perch (Perca fluviatilis), Small perch is everyday food; large inland perch is limited for children and in pregnancy.. The national eating advice, why it applies, the rules that matter when you catch it, and what the kitchen changes about the numbers.
Where it lives
The most widely caught fish in the region and probably the first fish most people here ever catch: lakes, rivers, ponds and the brackish coast, from harbour walls to the outer archipelago. Small perch shoal tightly around structure; the large ones separate off, turn fish-eating and behave like a different animal entirely.
Why the advice says what it says
Perch is the species Nordic environmental monitoring reaches for when it wants to know what a lake is doing, because it lives almost everywhere, stays in one water and eats up the food chain as it grows. That last point is the whole story for eating advice. A 15 cm perch is eating insect larvae and crustaceans; a 35 cm perch has been eating other fish for years. The mercury difference between the two, from the same lake on the same day, is large. Lake chemistry doubles the effect: methylmercury is produced most readily in brown, acidic, humic waters — forest lakes, bog-fed lakes, newly flooded reservoirs — and least in clear, hard, alkaline lakes. This is why national advice singles out large perch from inland waters and says nothing about the palm-sized ones from the sea. It is also why a blanket answer to "is perch safe" is useless: the honest answer depends on the size of the fish and the colour of the water it came out of.
The advice
| Who it applies to | What the advice says | Where it comes from |
|---|---|---|
| Children, and people who are pregnant or breastfeeding | Large perch from inland waters: at most one to two meals a month. Named alongside pike-perch and burbot. | Finnish Food Authority (Ruokavirasto) |
| Everyone else | No specific frequency limit for perch; the general advice to eat fish two to three times a week and vary the species applies. | Finnish Food Authority (Ruokavirasto); Nordic Nutrition Recommendations 2023 |
| Small coastal perch | Not the fish the advice is about. A short-lived, small perch has had little time to accumulate anything. | Reasoning from the accumulation pattern above |
The rules
What the rule book says about this fish, described by instrument rather than printed as a number:
- Perch does not carry a minimum size everywhere, but plenty of individual waters set one — and the shared Lake Peipsi rules, agreed between Estonia and Russia, are their own regime with their own figures.
- Check the water, not the species. For perch more than for any other fish here, the binding rule is local.
- Gear rules still bite even where no size limit exists: net mesh sizes, the number of hooks and the seasons for set gear are all regulated.
- Ice fishing has its own restrictions in some waters and is entirely closed in others while other species spawn.
In the kitchen
Perch has armoured scales and a spiny dorsal fin, so most people skin it rather than scale it, and the fillet yield off a small perch is genuinely poor — this is a fish where the effort is in the preparation, not the cooking. The flesh is firm, white and very lean, which is why it fries well and boils badly. In Finland and Estonia the classic use of a bucket of small perch is to fry them whole; the classic use of one big perch is to fillet it, which is exactly the fish the advice asks you to eat less of.
This is a reference page, not a fishing licence and not medical advice. Minimum sizes, closed seasons, bag limits and licence prices are set per country and per water body and change most years, so no number for them is printed here — each species page says which instrument sets the rule and where to look up the figure for the water you are standing on. If a clinician has given you a fish frequency or a contaminant instruction, that instruction outranks anything on this page.
Nutrition figures
| Per 100 g, raw | Amount |
|---|---|
| Energy | 91 kcal |
| Protein | 19.4 g |
| Fat | 0.9 g |
| Carbohydrate | 0 g |
| Fibre | 0 g |
| Salt | 0.2 g |
| Published row | Perch, raw |
Related published rows:
- Perch, cooked — 117 kcal per 100 g
Typical round weight for the calculator: 200–800 g.
Eating advice: Finnish Food Authority and Swedish Food Agency national advice on Baltic and inland fish. Contaminant ceilings and the Baltic derogation: Regulation (EU) 2023/915; weekly tolerable intakes: EFSA methylmercury (2012) and dioxins/dioxin-like PCBs (2018). Nutrition figures: USDA FoodData Central rows published on this site. Checked 2026-09-06.
Frequently asked questions
Is perch from the sea safer than perch from a lake?
The advice that names perch is specifically about large perch from inland waters. Small brackish-coast perch grow fast, are usually taken young and are not the fish the advisory is aimed at. That is a statement about the published advice, not a licence to eat unlimited quantities of anything.
Fish in the same advice group
Pike
Not in pregnancy at all; one to two meals a month for everyone else.
Pike-perch (zander)
Limited for children and in pregnancy where it comes from inland waters.
Burbot
Limited for children and in pregnancy; the liver deserves its own caution.
All species compared
The full table, grouped the way the advice groups it.
Eat the fish, log the fish
TempoLife tracks what you actually ate against the same food data linked on this page, so a fish meal shows up in your omega-3, vitamin D and salt totals without a second thought.