Semioperculum: A Nonheritable Deformity in Mozambique Tilapia

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Abstract
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 F1 or the F2 generations, so it was probably a nonheritable defect.

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