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Effects of surface orientation and slurry coating on settlement of Sydney rock, Saccostrea commercialis, oysters on PVC slats in a hatchery

1996; Elsevier BV; Volume: 15; Issue: 3 Linguagem: Inglês

10.1016/0144-8609(95)00012-7

1873-5614

John E. Holliday,

Aquaculture Nutrition and Growth

Hatchery reared pediveliger larvae of Sydney rock (Saccostrea commercialis) oysters settled within 10-litre aquaria, on PVC slats and on PVC slats coated with a lime and cement slurry. Settlement on horizontally positioned slats (76·6% of larvae settled; 23·8 spat/cm2), was significantly (P < 0·001) higher than on vertically positioned PVC slats (0·71% of larvae settled; 0·2 spat/cm2). Larval settlement was significantly lower (P < 0·01) on horizontally positioned slats coated with a cement slurry (60·2% of larvae settled; 18·7 spat/cm2). Significantly higher (P < 0·01) settlement was recorded from the under surface of horizontally positioned slats and slurry-coated slats (46·2 and 35·0 spat/cm2, respectively) than from their upper surfaces (1·2 and 2·4 spat/cm2, respectively). However for vertically positioned slats, settlement was similar (P > 0·05) for the convex and concave surfaces (0·3 and 0·2 spat/cm2, respectively). These results indicate that PVC slats and slurry-coated PVC slats positioned horizontally are suitable for settlement of Sydney rock oyster larvae in a hatchery and may be suitable for remote setting.