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Xenomystus nigri
 

Xenomystus nigri

The African knifefish is distinguishable from N. chitala by the absence of a dorsal fin, but resembles it in being a twilight species. Occasionally it emits a groan-like sound from the pneumatic duct, which links the swim bladder to the digestive tube. Size: 10-20 cm

Xenomystus nigri

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БЕЛОЗЕРСКОЕ КНЯЖЕСТВО древнерусское , в районе Белого и Кубенского оз. и по нижней Шексне. С 1207 удел Ростовского княжества. С 1238 - самостоятельное. Столица - Белоозеро. В 1389 удел Московского великого княжества.