Doroudi, Mehdi S., Southgate, Paul C., and Mayer, Robert J. (1999) Growth and survival of blacklip pearl oyster larvae fed different densities of microalgae. Aquaculture International, 7 (3). pp. 179-187.

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Abstract

This paper reports on an experiment to determine growth and survival of blacklip pearl oyster, Pinctada margaritifera (L.), larvae fed a 1:1 mixture of Isochrysis aff. galbana clone T-ISO and Pavlova salina at six different densities (1, 2, 5, 10, 20 and 30 × 10³ cells ml⁻¹. Larval growth and survival were assessed every four days over a 20–day period. Exponential and logistic regression models were fitted to the growth and survival responses, respectively. Overall growth of larvae fed ≥5 × 10³ cells ml⁻¹ was significantly greater (p > 0.01) than growth of larvae reared at other algal densities. The optimal food ration for maximum larval growth was 20 × 10³ cells ml⁻¹, which resulted in larvae with antero-posterior shell length of 230 μm after 20 days. These larvae were significantly larger (p > 0.05) than those in all other treatments at the end of the experiment. Survival of larvae fed 0, 1 and 2 × 10³ cells ml⁻¹ was significantly lower than that of larvae in all other treatments at the end of 15 days (p > 0.01). Maximal survival (8%) over the 20 day period was shown by larvae fed 10 × 10³ cells ml⁻¹, while lower survival was shown by larvae fed 2 × 10³ cells ml⁻¹ (2%) and 1 × 10³ cells ml⁻¹ (0%).

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