Perca flavescens (Yellow Perch): ID, Size and Eating

• Body shape: A rather deep, slab-sided fish that is nearly sunfish-shaped.
• Dorsal fin: There are 2 fully separate dorsal fins (a spiny one in front, a soft one behind).
• Body markings: 6-8 regularly spaced dark bars cross the back and extend vertically onto the sides.
• Jaw length: The upper jaw extends back about as far as the middle of the eye, and the teeth are small and inconspicuous — quite unlike the large canine teeth of the walleye and sauger.

The yellow perch lacks the large, prominent teeth found in walleye and sauger, which can be used to tell them apart. See the Walleye page for its full mark list.

The ruffe resembles a yellow perch with walleye-like markings, but its head lacks scales, and its dorsal fin is a single spiny fin rather than the yellow perch's two separate dorsal fins.

A freshwater fish, primarily found in lakes, also occurring in still-water environments such as impoundments. Ranges from west-central Canada and the Hudson Bay area east to New Brunswick, south to South Carolina, and west to Kansas.

Lay the fish flat on its side in even light and photograph the whole body first, then the details below. Get a close, sharp frame of the head: mouth, jaw length and any barbels. Raise the dorsal and anal fins fully; ray counts and fin edges only read when the fin is spread. Shoot the side of the body before the fish dries; spots and stripes fade fast out of water. The app reads the photo and names the likely species; use the marks on this page to confirm it.

Size and daily limits for this species differ by state and by water, and some waters are catch-and-release only. Check the current regulations for where you are fishing before keeping any fish; if you are unsure of the species, release it.

Perca is the genus of true perches in the perch family, Percidae, the same family as walleye and sauger. Perca flavescens, the yellow perch, is North America's species. Its closest relative is the European perch, Perca fluviatilis; Wikipedia notes the two are so similar that the yellow perch has sometimes been treated as a subspecies, and the two can interbreed.

How to tell them apart if you fish on both continents: the European perch has five to eight dark vertical bars and, as it matures, develops a hump between the head and the dorsal fin (Wikipedia). It also grows larger, to a documented 60 cm, with an IGFA record of 2.9 kg from Finland in 2010. Outside Europe it is an invasive problem; in Australia, where it is called redfin, it is classed as a noxious species in New South Wales.

• Size: common length 19.1 cm (7.5 in), maximum 50 cm (19.7 in) (FishBase, US Fish and Wildlife Service)
• Record: 1.9 kg (4 lb 3 oz), caught in May 1865 at Bordentown, New Jersey, still the IGFA world record (Wikipedia)
• Age: most live 9 to 10 years; FishBase gives a maximum reported age of 11
• Maturity: males at 2 to 3 years, females at 3 to 4 (Wikipedia)
• Spawning: females lay gelatinous egg strands of 10,000 to 40,000 eggs over vegetation, a habit Wikipedia calls unique among North American freshwater fish; eggs hatch roughly 12 days after fertilisation, depending on temperature (US Fish and Wildlife Service)
• Depth and temperature: 0 to 56 m, usually 0 to 9 m; 0 to 30 C (FishBase)
• Status: Least Concern on the IUCN Red List, assessed 2012 (FishBase)

The US Fish and Wildlife Service describes the stripes as 6 to 8 triangular olive-green bars, which matches the 6 to 8 dark bars listed as a key mark above.

Yellow perch is one of the most valued food fish of the Great Lakes. The US Food and Drug Administration puts perch, both freshwater and ocean, in its 'Best Choices' group, its lowest-mercury category, and FishBase notes the flesh provides protein (17.5%), calcium, selenium and omega-3 fatty acids.

For fish you catch yourself, contaminant levels depend on the lake or river, not just the species, so check your state's fish consumption advisory for that water before eating it, and keep to its size and daily limits.

The European perch is also widely eaten. Wikipedia describes its meat as white, firm and flaky and reports a global commercial catch of 28,920 tonnes in 2013, mainly from Russia, Finland and Estonia.

Because demand is steady and the main commercial supply, Lake Erie, is catching fewer fish. A CP24 report of 24 July 2026 describes yellow perch as the highest-value species in Lake Erie's commercial fishery, which brings in roughly 80% of Ontario's commercial fishing revenue, worth over $200 million a year. A commercial crew member told CP24 the catch was 'next to nothing'.

The causes cited in that report:

• Walleye: the Ontario Commercial Fisheries Association said walleye numbers have run at 50 to 100 million a year from 2020 to 2026, 'way above normal', and adult perch are walleye prey
• Cormorants: nests rose from fewer than 90 in 1979 to over 13,000 by the mid-2000s, though the association said there is no quantifiable evidence linking them to the current decline

The fishery has recovered before: CP24 notes a severe drop in 1995 to 1996 followed by a rebound within a couple of years. Farming is not a large alternative yet; Wikipedia puts US Midwest aquaculture at about 90,800 kg a year.