CO² -induced pH reduction hinders shell development of early larvae donkey’s ear abalone Haliotis asinina (Linnaeus 1758)

Sheila Mae Salarda Santander - De Leon; Sayno, Angelie Tunay

CO² -induced pH reduction hinders shell development of early larvae donkey’s ear abalone Haliotis asinina (Linnaeus 1758)

2018

Sheila Mae Salarda Santander - De Leon | Sayno, Angelie Tunay

This study elucidated the effects of CO2-induced pH reduction on the early larval development of ecologically and economically important donkey’s ear abalone Haliotis asinina (Linnaeus 1758).Results showed significant decrease in shell length with decreased pH (pH 8.15 > 7.85 > 7.65). More than 50 % of shell malformations were evident from as early as 2 h exposure at pH 7.85 and pH 7.65.At pH 7.65, no normal shell formation was observed at post 2 h. Induced pCO₂ reduced pH in this study resulted to saturation levels of calcite and aragonite at 2.65 – 2.74 Xcalc; 1.76 – 1.83 Xarag (pH 7.65) and 3.84 – 4.00 Xcalc; 2.57 – 2.67 Xarag (pH 7.85). These values were lower than the control (pH 8.15) at 6.66 – 6.85 Xcalc; 4.43 – 4.57 Xarag, which may explain the observed impaired development of H. asinina at reduced pH.

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