An Anomalous Hatchery-Reared Biwa Rock Catfish, Silurus lithophilus (Teleostei: Siluridae),with an Adipose Fin-Like Projection

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 pro...

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Bibliographic Details
Published inZoological science Vol. 32; no. 5; p. 435
Main Authors Kitagawa, Tetsuro, Hosoya, Kazumi
Format Journal Article
LanguageEnglish
Published Japan 01.10.2015
Subjects
Animal Fins - abnormalities
Animals
Aquaculture
Catfishes - abnormalities
Fish Diseases - congenital
Fish Diseases - diagnostic imaging
Fish Diseases - pathology
Radiography
Spine - abnormalities
Spine - diagnostic imaging
Spine - pathology
dysplasia
evolution
fin-ray
artificial breeding
endemic species
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Summary: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.
ISSN:0289-0003
DOI:10.2108/zs140296