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The Romanian barbel (Barbus petenyi) is a species of ray-finned fish in the genus Barbus. It occurs in the lower Danube basin of Bulgaria and Romania, as well as in several rivers of Bulgaria flowing into the Black Sea, such as Kamchiya. [2] The species is named after János Salamon Petényi. Males can reach 25 cm in length.
According to a systematic list of the Romanian vertebrate fauna, there are 732 species of vertebrates living in Romania. When grouped into classes, the largest number of these species are birds, with 382 species, followed by fish with 184. 110 of these species are mammals, 31 are reptiles, 20 are amphibians, while only four belong to the Cyclostomata class of jawless fish.
This fish was described in 1957 by Romanian student scientists M. Dumitrescu, P. Bănărescu, and N. Stoica. Local names include asprete , poprete , and sforete . Endemic to a very restricted area in southern Romania , it was found in the upper reach of the Argeş River and in two of its tributaries: Râul Doamnei and Vâlsan .
Merluccius merluccius is a slim-bodied fish with a large head and large jaws in which are set a number of large curved teeth, [2] the lower jaw having two rows of teeth and the upper jaw one row. [3] The inside of the mouth and the branchial cavity are black. [4] The body is at its widest just behind its head. [5]
These fish have two types of tuberous electroreceptor: [note 2] the Knollenorgan [43] and the Mormyromast. [ 44 ] [ 45 ] Both organs are found in adult individuals, where they are lightly covered by epithelial cells and skin, while their sensitivity ranges from 0.1 mV and 10 mV/cm/ Tens of Hz up to more than a kHz .
The common chub (Squalius cephalus), also known as the European chub or simply chub, [2] [1] is a species of European freshwater ray-finned fish in the carp family Cyprinidae, that frequents both slow and moderate rivers, as well as canals, lakes and still waterbodies of various kinds.
It is the only species in the genus Joturus, one of 17 mullet genera containing altogether about 80 species of ray-finned fish. [1] It occurs in rivers, including brackish waters , in much of the Gulf of Mexico basin from Mexico as far south as Panama and the Caribbean coast of Colombia , as well as the West Indies and the United States state ...
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