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Perch is a common name for freshwater fish from the genus Perca, which belongs to the family Percidae of the large order Perciformes. The name comes from Greek : πέρκη , romanized : perke , meaning the type species of this genus, the European perch ( P. fluviatilis ).
Yellow perch are effective at escaping predation seasonally by lake trout and other native fishes during summer, perhaps due to the high thermal tolerance of yellow perch. [4]: 19 Perch are commonly active during the day and inactive at night except during spawning, when they are active both day and night. Perch are most often found in schools.
Perciformes (/ ˈ p ɜːr s ɪ ˌ f ɔːr m iː z /), also called the Acanthopteri, is an order or superorder of ray-finned fish in the clade Percomorpha. Perciformes means "perch-like".". Among the well-known members of this group are perches and darters (), and also sea basses and groupers
Body roundness index (BRI) is a calculated geometric index used to quantify an aspect of a person's individual body shape. Based on the principle of body eccentricity, it provides a rapid visual and anthropometric tool for health evaluation. [1] Introduced in 2013, the BRI calculation can be used to estimate total and visceral body fat.
The fish's body is flat to the side, and is high vertically, which is pyramid-shaped. Its body length is from 15 to 20 centimeters(6~8 inches). It has a relatively bigger head compared to its body, and has eyes on the top of its head. Its mouth is big and sharp at the end, and its upper chin is slightly longer than the lower one.
The family contains more than 200 species in 11 genera. The perches and their relatives are in this family; well-known species include the walleye, sauger, ruffe, and three species of perch. However, small fish known as darters are also a part of this family.
Lutjanus johnii has a moderatel deep body in which its standard length is 2,4 to 2.9 its depth at the deepest point. It has a steeply sloped forehead and the incision and know on the preoperculum are weakly developed The vomerine teeth are arranged in a crescent shaped patch with no rearwards extension although there is a patch of granular teeth on the tongue. [5]
Percomorpha (from Latin perca ' perch ' and Ancient Greek μορφή (morphḗ) ' shape, appearance ') is an extremely large and diverse clade of ray-finned fish.With more than 17,000 known species (including tuna, seahorses, gobies, cichlids, flatfish, wrasse, perches, anglerfish, and pufferfish) known from both marine and freshwater ecosystems, it is the most speciose clade of extant ...