parent_taxon serrasalmidae
Serrasalmidae is a family of characiform fishes , recently elevated to family status . It includes about 94 species . The name means `` serrated ___MASK48___ family '' , which refers to the serrated keel running along the belly of these fish . Fish classified as Serrasalmidae are also known by these common names : pacu , piranha , and silver dollar . These common names generally designate differing dental characteristics and feeding habits . ___MASK21___ is a family of ray - finned fish , the only living family currently placed in the order ___MASK11___ . It includes salmon , trout , chars , freshwater whitefishes , and graylings , which collectively are known as the salmonids . The Atlantic salmon and trout of the genus " Salmo " give the family and order their names . A piranha or piraña (, or ) is a member of family ___MASK55___ in order ___MASK14___ , an omnivorous freshwater fish that inhabits South American rivers . In Venezuela , they are called caribes . They are known for their sharp teeth and powerful jaws . ___MASK73___ is a sparsely populated region located at the southern end of South America , shared by Argentina and Chile . The region comprises the southern section of the Andes mountains as well as the deserts , steppes and grasslands east of this southern portion of the Andes . ___MASK73___ has two coasts ; a western one towards the Pacific Ocean and an eastern one towards the Atlantic Ocean . ___MASK55___ , the characids or characins is a family of freshwater subtropical and tropical fish , belonging to the order ___MASK14___ . The name " characins " is the historical one , but scientists today tend to prefer " characids " to reflect their status as a by and large monophyletic group at family rank . To arrive there , this family has undergone much systematic and taxonomic change . Among those fishes that remain in the ___MASK55___ for the time being are the tetras , comprising the very similar genera " Hemigrammus " and " Hyphessobrycon ", as well as a few related forms such as the cave and neon tetras . Fish of this family are important as food and also include popular aquarium fish species . ___MASK14___ is an order of ray - finned fish , comprising the characins and their allies . Grouped in 18 recognized families , there are more than two thousand different species , including the well - known piranha and tetras . ___MASK97___ is a genus of fish in the family ___MASK21___ ; it contains the Pacific salmon and Pacific trout . The name of the genus is derived from the Greek " onkos " (" hook ") and " rynchos " (" nose "), in reference to the hooked jaws of males in the mating season ( the " kype "). The Great Lakes ( also called the Laurentian Great Lakes , or the Great Lakes of North America ) are a series of interconnected freshwater lakes located primarily in the upper mid - east region of North America , on the Canada  United States border , which connect to the Atlantic Ocean through the Saint Lawrence River . Consisting of Lakes Superior , Michigan , Huron ( or Michigan  Huron ), Erie , and Ontario , they form the largest group of freshwater lakes on Earth , containing 21 % of the world ' s surface fresh water by volume . The total surface is , and the total volume ( measured at the low water datum ) is . Due to their sea - like characteristics ( rolling waves , sustained winds , strong currents , great depths , and distant horizons ) the five Great Lakes have also long been referred to as " inland seas ". Lake Superior is the second largest lake in the world by ___MASK16___ , and Lake Michigan is the largest lake that is entirely within one country . The southern half of the Great Lakes is bordered by the Great Lakes Megalopolis . ___MASK48___ is the common name for several species of ray - finned fish in the family ___MASK21___ . Other fish in the same family include trout , char , ___MASK43___ and whitefish . ___MASK48___ are native to tributaries of the North Atlantic ( genus " Salmo ") and Pacific Ocean ( genus " Oncorhynchus "). Many species of salmon have been introduced into non - native environments such as the Great Lakes of North America and Patagonia in South America . ___MASK48___ are intensively farmed in many parts of the world . A fish is any member of a group of organisms that consist of all gill - bearing aquatic craniate animals that lack limbs with digits . They form a sister group to the tunicates , together forming the ___MASK67___ . Included in this definition are the living ___MASK96___ , lampreys , and cartilaginous and bony fish as well as various extinct related groups . Tetrapods emerged within lobe - finned fishes , so cladistically they are fish as well . However , traditionally fish are rendered obsolete or paraphyletic by excluding the tetrapods ( i . e ., the amphibians , reptiles , birds and mammals which all descended from within the same ancestry ). Because in this manner the term " fish " is defined negatively as a paraphyletic group , it is not considered a formal taxonomic grouping in systematic biology . The traditional term pisces ( also ichthyes ) is considered a typological , but not a phylogenetic classification . Pacu is a common name used in the aquarium trade to refer to several common species of omnivorous South American freshwater fish that are related to the piranha . Pacu and piranha do not have similar teeth , the main difference being jaw alignment ; piranha have pointed , razor - sharp teeth in a pronounced underbite , whereas pacu have squarer , straighter teeth , which are uncannily similar to ___MASK89___ teeth , and a less severe underbite , or a slight overbite . Pacu , unlike some types of piranha , actually feed on plants and not flesh . Additionally , full - grown pacu are much larger than piranha , reaching up to and in the wild . ___MASK65___ is a genus of fish in the salmon family Salmonidae that includes the European species of salmon and trout , among them the familiar Atlantic salmon " ___MASK65___ salar " and the brown trout " ___MASK65___ trutta ". The natural distribution of " ___MASK65___ " also extends to Northern Africa and to Western Asia around the Black Sea basin . The single " ___MASK65___ " species naturally found in the Atlantic North America is the Atlantic salmon , whereas the salmon and trout of the Pacific basin belong to another genus , " Oncorhynchus ". The generic name " ___MASK65___ " derives from the Latin " salm " ( salmon ). The number of distinct species and subspecies in " ___MASK65___ " is a debated issue . Atlantic salmon and brown trout are widespread species , while most of the other taxa are narrowly distributed forms endemic to single watersheds . Venezuela , officially the Bolivarian Republic of Venezuela , is a federal republic located on the northern coast of South America . It is bordered by Colombia on the west , Brazil on the south , Guyana on the east , and the islands of Trinidad and Tobago to the north - east . Venezuela ' s territory covers around with an estimated population . Venezuela is considered a state with extremely high biodiversity ( currently ranks 7th in the world ' s list of nations with the most number of species ), with habitats ranging from the Andes Mountains in the west to the Amazon Basin rain - forest in the south , via extensive " llanos " plains and Caribbean coast in the center and the Orinoco River ___MASK56___ in the east . Trout is the common name for a number of species of freshwater fish belonging to the genera " ___MASK97___ ", " ___MASK65___ " and " Salvelinus ", all of the subfamily Salmoninae of the family Salmonidae . The word " trout " is also used as part of the name of some non - salmonid fish such as " Cynoscion nebulosus ", the spotted seatrout or speckled trout .