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Mortality in single‐pair mating families of QX disease‐resistant and wild‐type Sydney rock oysters ( Saccostrea glomerata )
Author(s) -
Kan Alison,
Dove Michael C,
O'Connor Wayne A,
Nair Sham V,
Raftos David A
Publication year - 2011
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/j.1365-2109.2010.02682.x
Subject(s) - biology , mating , mating type , zoology , ecology , genetics , gene
QX disease causes mass mortalities among Sydney rock oysters ( Saccostrea glomerata ). To overcome commercial production losses, Industry & Investment NSW has been developing mass selected QX disease‐resistant breeding lines since 1997. This breeding programme has significantly reduced QX‐associated mortality in the Lime Kiln Bar (LKB) breeding line relative to non‐selected, wild‐type (WT) oysters. The current study assessed mortality in families produced by single‐pair mating between LKB and WT oysters. When these families were grown in a QX disease‐prone area, the progeny of LKB × LKB crosses had significantly lower mortality compared with LKB × WT or WT × WT families. Mortality in the different crosses was associated with infection by sporulating Marteilia sydneyi , the parasite responsible for QX disease. Overall, the study identified a strong association between parentage and mortality resulting from QX disease.