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Large adult perch feed on invertebrates, fish eggs, crayfish, mysid shrimp, and juvenile fish. They have been known to be predominantly piscivorous and even cannibalistic in some cases. About 20% of the diet of a yellow perch over 32 g (1.1 oz) in weight consists of small fish.
The European perch (Perca fluviatilis), also known as the common perch, redfin perch, big-scaled redfin, English perch, Euro perch, Eurasian perch, Eurasian river perch, Hatch, poor man's rockfish or in Anglophone parts of Europe, simply the perch, is a predatory freshwater fish native to Europe and North Asia. It is the type species of the ...
These fish can be found in freshwater all over the world, and are known to inhabit the Great Lake region, in particular Lake Erie. These fish inhabit bodies of water where vegetation and debris is readily accessible. [15] [16] [17] In the spring when the perch chooses to spawn, they use vegetation to conceal their eggs from predators. [18]
The eggs will be fertilized and sink to the bottom of the lake. A single female can lay 200–700 eggs, which receive no parental care. The eggs will hatch in six days when the water temperature is 20–23 °C (68–73 °F). [2] The life span of the trout-perch is around 4 years.
Despite their viviparous nature, the fish is relatively fecund, with the number of eggs/female in Alaska ranging from 10,000 to 300,000, depending upon the size of the fish. [ 26 ] The evolutionary strategy of spreading reproductive output over many years ensures some reproductive success through long periods of poor larval survival. [ 27 ]
Like the stickleback fish, the male species protects the eggs from other creatures and supplies oxygen to the unhatched eggs by fanning its fins. It also takes care of the offspring until it grows to a certain size. Before it hatches, some fish such as the striped shinner also lay eggs on the original eggs. However, it does not harm the ...
The Macquarie perch is primarily an upland native fish and has a breeding biology clearly adapted to flowing upland rivers and streams. (For this reason, the species has proven difficult to breed artificially, as captive females do not produce ripe eggs when kept in still broodponds or tanks).
The Western pygmy perch is a small fish with an olive, brown and green mottled body with tow orange stripes along the flanks. In the breeding season the males develop brighter colouration with golden mottling along the flanks, a reddish-orange abdomen and the fins darken. The females develop a bluish colour when breeding. [3]