Yellow perch
American perch
The American perch (Perca flavescens) is only slightly different from the Eurasian ( Perca fluviatilis). Nevertheless, it is now clear that it is a separate "good" kind - because the two do not even have to cross viable.
Features
There are a number of features in which the two types differ statistically. Thus, the American bass a little more saddle binding ( horizontal stripes; 5-9) than the Eurasian (5-8), the ventral fins are less reddish, the maximum size seems to be lower ( Weight 2 kg at about 40 cm compared to 10 kg in approximately 65 cm in length ). The black Dorsalisfleck is less pronounced. The color is more golden than green - green - silver. Anatomically, it differs in that the Praedorsale a muscle segment further back (the first, enlarged Interneuralknochen before the first dorsal fin ) than in European Art
Fins formulas:
- P. flavescens: D1 XII - XIV; D2 II/12-13. A II / 7 - 9 51-61 lateral line scales.
- P. fluviatilis: D1 XIII - XIX; D2 I/15 - 18; A II / 8 - 11 39-42 vertebrae. 56-77 lateral line scales.
Occurrence
The U.S. Yellow Perch ( Yellow perch) called American perch comes in all of North America east of the Rocky Mountains before - if not by natural spread, so by human assistance (now related in all EU countries ). This is due to the fact that he is appreciated by the population as a sport, but also as a food fish more than our perch, which is widely seen almost locally and decided as "fish weed ". The Yellow Perch particularly in the Great Lakes region in the View where you could market at the beginning of the 1970s, each year about 10,000 tons. Since that time is the catch - from essentially still unexplained causes - but declined such that the fish had to be made locally under protection, hatcheries even mass - cage rearing are carried out to supply restaurants went into operation. Especially in winter, it is difficult to get through without imports of fillets of European Perca fluviatilis from the EU - the proof of origin is, however, to inform consumers by means of PCR testing easy.