Graduate Thesis Or Dissertation
 

Evaluation of spray-dried microalgae in diets for juvenile Manila clam Tapes philippinarum

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  • Effects of spray-dried algae, Schizochytrium sp. and Haematococcus pluvialis, on growth and survival of Manila clam, Tapes philippinarum, spat were determined. Results of the present study showed that these two different spray-dried diets supported clam growth when added as supplements to rations of a mixed diet of the live algae Isochrysis galbana and Chaetoceros calcitrans. Increase in clam wet weight with 1/4 ration of live algae and a supplement of Haematococcus pluvialis or Schizochytrium sp. were similar to those of clams fed on a full live algal ration alone. This result shows that 75% substitution of live algae is possible with spray-dried algae without significantly reducing the live (wet) growth of the clams. Furthermore, effects of three different clays, kaolin, calcium montmorillonite and calcium bentonite, were determined. No significant difference in clam growth rate (% wet and organic weight increase) among treatments with additions of bentonite, kaolin and montmorillonite was found. Effect of different concentrations of calcium bentonite and Haematococcus pluvialis were tested on the growth rate of the clams. Results indicated that different concentrations of Haematococcus pluvialis and calcium bentonite did not improve the growth of the animals. Seventy five percent substitution of live algae with spray-dried algae can decrease the production cost by up to 50%. Therefore, use of spray-dried diets will greatly decrease the costs of juvenile clam nurseries and lead to more consistent and economic production.
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file details OnalEbru2001.pdf 2017-08-19 Pubblico Scaricare