The knothead malformation of carp described here is believed to be the first known instance of rickets among fishes. Its resemblance to rickets in man and other higher vertebrates is as close as can be expected in view of the anatomical difference between fish and mammal. Carp may be affected by it from the fingerling stage through life. Their sluggishness of habit and their retarded growth are further indications of a rachitic condition. These rachitic carp are recognized by the bulging of the opercles, which is often so extreme that respiration is seriously embarrassed.
Publisher
Champaign : Illinois Natural History Survey
Series/Report Name or Number
Illinois Natural History Survey Bulletin; v. 017, no. 08
ISSN
0073-4918
Type of Resource
text
Language
en
Permalink
http://hdl.handle.net/2142/45915
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