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Semioperculum: A Nonheritable Deformity in Mozambique Tilapia
Author(s) -
Handwerker Thomas S.,
Tave Douglas
Publication year - 1994
Publication title -
journal of aquatic animal health
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.507
H-Index - 52
eISSN - 1548-8667
pISSN - 0899-7659
DOI - 10.1577/1548-8667(1994)006<0085:sandim>2.3.co;2
Subject(s) - tilapia , biology , deformity , operculum (bryozoa) , anatomy , fish <actinopterygii> , zoology , fishery , genus , genetics
Four Mozambique tilapia Tilapia mossambica males that had a semioperculum were found. This was a deformity wherein the operculum was missing its posterior edge because the subopercle or both the subopercle and the opercle bones developed abnormally; thus, a semioperculum was shortened along the anterior‐posterior axis. Additionally, the branchiostegal membrane associated with the semioperculum was also deformed, in that the posterior and ventral edges were not completely developed. This deformity was not observed in either the F 1 or the F 2 generations, so it was probably a nonheritable defect.