Po gudgeon
| Po gudgeon | ||||||||||||
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| Scientific name | ||||||||||||
| Romanogobio benacensis | ||||||||||||
| ( Pollini , 1816) |
The Po gudgeon ( Romanogobio benacensis ) is an endangered species of fish belonging to the carp family . Originally widespread in rivers in northern Italy and Slovenia , the species has been displaced from its ancestral habitat by an imported relative, the gudgeon ( Gobio gobio ).
distribution and habitat
The range of the Po gudgeon was originally limited to the river areas of the Po in northern Italy and the Isonzo and Reka in Slovenia. However, it was also introduced to central Italy in the Arno and Ombrone river basins . The species inhabits channels, warm streams and ponds in addition to the major main streams. Po gudgeons are usually found on sandy ground, but avoid strong currents.
Appearance
With a standard length of up to ten centimeters and a structure typical of the species , the Po gudgeon can be distinguished from its European relatives by the number of scales between the anal fin and anus. The species only has two to three scales here, while other members of the genus Romanogobio and also the gudgeon ( G. gobio ) have four to eight scales in this area. The ventral scales extend from the base of the pectoral fins to that of the pelvic fins .
Way of life
The Po gudgeon, which lives in small groups, feeds primarily on small invertebrates. The mating season lasts from April to June, spawning takes place in several portions over a sandy bottom. The larvae hatch seven to eight days after egg-laying. The offspring reproduce for the first time when they are one to two years old. Po gudgeons experience one to two reproductive periods and reach an age of four years.
Systematics
The Po gudgeon was transferred in 2007 by Kottelat and Freyhof from the genus Gobio to the genus Romanogobio . Bianco does not see this change as being covered by the results of genetic tests.
status
The ancestral distribution area of the Po gudgeon is relatively large, but the remaining occurrences are limited to relatively few places and the population is highly fragmented. The main cause is probably the gudgeon ( G. gobio ), which has been extensively introduced for sport fishing purposes , which competes with the native species and replaces them in their habitat. Further threats come from water pollution and hydraulic engineering measures. The IUCN leads the Po gudgeon therefore as "high risk" ( endangered ).
supporting documents
- ↑ a b c d e Pier Giorgio Bianco: Threatened fishes of the world: Gobio benacensis (Pollini, 1816). In: Environmental Biology of Fishes. Volume 84, No. 1, 2009, ISSN 0378-1909 (print), ISSN 1573-5133 (online), pp. 39-40 ( PDF; 68.7 kB ).
- ↑ a b c d e f Maurice Kottelat , Jörg Freyhof: Handbook of European Freshwater Fishes , Cornol (Switzerland) u. Berlin, 2007, ISBN 978-2-8399-0298-4 . Pp. 102, 103
- ↑ a b Romanogobio benacensis in the endangered Red List species the IUCN 2009. Posted by: AJ Crivelli, 2006. Retrieved on January 16 of 2010.
Web links
Po gudgeon on Fishbase.org (English)