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1 October 2015 An Anomalous Hatchery-Reared Biwa Rock Catfish, Silurus lithophilus (Teleostei: Siluridae),with an Adipose Fin-Like Projection
Tetsuro Kitagawa, Kazumi Hosoya
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Abstract

An anomalous individual with an adipose fin-like projection was discovered during seedling production of Biwa rock catfish, Silurus lithophilus (Teleostei: Siluridae). The external shape of the projection resembled an adipose fin, but soft rays were clearly observed within it. The projection was proximally supported by a series of pterygiophores and by 14 soft rays. The projection can be explained as: I, homologous with a primitive adipose fin, which occurred as a result of localized ontogenetic reversion; II, an extra fin that occurred as a result of abnormal expression of a regeneration mechanism; III, a remnant of a dorsal fin and/or a second dorsal fin; and IV, an inversion phenomenon of the polarity in the formation process of the anal fin.

© 2015 Zoological Society of Japan
Tetsuro Kitagawa and Kazumi Hosoya "An Anomalous Hatchery-Reared Biwa Rock Catfish, Silurus lithophilus (Teleostei: Siluridae),with an Adipose Fin-Like Projection," Zoological Science 32(5), 435-437, (1 October 2015). https://doi.org/10.2108/zs140296
Received: 30 December 2014; Accepted: 1 May 2015; Published: 1 October 2015
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KEYWORDS
artificial breeding
dysplasia
endemic species
evolution
fin-ray
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