Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Effect of an artificial diet on early spat growth of the Japanese pearl oyster Pinctada fucata martensii.

Abstract

Two experiments (experiments I and II) were conducted to determine whether gelatin-acacia microcapsules (GAM) are useful for the growth of pearl oyster spat. In experiment I, the spat were either not fed (control) or fed GAM at concentrations of 1×103, 5×103, 2×104, and 1×105 particles/ml per day. In experiment 2, spat were fed the alga Isochrysis galbana at concentrations of 2×103 and 3×104 cells/ml per day. The low-density algal diet (I. galbana; 2×103 cells/ml per day) was also supplemented with microcapsules at 4 treatment concentrations of 1×103, 5×103, 2×104 and 1×105 particles/ml per day. In experiment I, there was no significant difference (P<0.05) in the growth of unfed controls and pearl oyster spat fed with GAM. In experiment 2, the addition of microcapsules at 5×103 and 2×104/ml per day to the low-density algal diets produced a significant (P) improvement in the growth of pearl oyster spat. However, the high-density supplementation of gelatin-acacia microcapsules (1×105 particles/ml per day) inhibited the growth of the pearl oyster spat. The results of this study indicate that pearl oyster also require unsaturated fatty acids for their growth.