農業部-水產試驗所全球資訊網農業部-水產試驗所全球資訊網

微藻是提供牡蠣浮游苗營養之最主要的餌料生物，而不同的藻種具有不同的細胞大小與營養成分，適合不同時期的需求。因此，為穩定並擴大牡蠣人工育苗產能，本計畫擬研究出最適臺灣環境之單一投餵藻種，及依不同時期所需的最適複合投餵藻種。依據本研究結果顯示，建議以擬球藻（Nannochloropsis oculata）做為單一投餵藻種， 投餵濃度為2x10³cells/個體/日，且投餵量逐日增加8%，可取得最佳的成長率及存活率直至附苗。其次則為投餵濃度為2x10³cells/個體/日的等鞭金藻（Isochrysis galbana），雖然成長率及存活率皆較低於2倍組的擬球藻，但相較於其他組別仍可穩定成長直至附著。複合投餵藻種試驗結果發現，待牡蠣苗成長至150 μm後，以牟氏角毛藻（Chaetoceros gracilis）或周氏扁藻（Tetraselmis chui）取代部分比例之擬球藻，皆能有效提高牡蠣浮游苗成長率。

Microalgae are the most important bait organisms that provide nutrition for oyster larvae. Different algae species have different cell sizes and nutrients, which are suitable for the needs of different periods. Therefore, in order to stabilize and expand the production capacity of artificial oyster spat, this project intends to study the single-feeding algae species that is most suitable for Taiwan's environment, and the optimal compound-feeding algae species that is required in different periods. According to the results of this study, it is recommended to use Nannochloropsis oculata as a single feeding algae species, with a feeding concentration of 2 x 10³ cells/ind/day, and an increase of 8% daily to achieve the best growth rate and survival rate until spat. The second is Isochrysis galbana fed with a concentration of 2 x 10³ cells/ind/day. The results of the compound feeding of algae species showed that after the oyster larvae grow to 150 μm, replacing part of the proportion of Nanno with Chaetoceros gracilis or T etraselmis chui can effectively increase the growth rate.