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

本研究調查台東成功地區的九孔苗培育期間，浪板上的藻類的變化及附苗初期的九孔對餌藻的偏好性。試驗期間，浪板上共觀察到22屬附著性藻類，其中有19屬為矽藻類，其他3屬分別為：絲藻 (Dilabifilum sp.) 的營養體、石蓴類 (Ulvaria sp.) 的游泳孢子 (zoospore) 和綠色隱鞭藻(Chroomonas sp.)。這些微藻類的分布及組成在浪板上有上、下半部的差異。浪板上矽藻量以菱形藻 (Nitzschia sp.) 最多，其他依序為針桿藻 (Synedra sp.)、舟形藻 (Navicula sp.)、雙壁藻 (Diploneis sp.)、卵形藻 (Cocconeis sp.) 和曲殼藻 (Achnanthes sp.)。計算不同日齡的九孔苗腸道內的微藻類組成及分布，然後利用ANOVA 和Kolmogorov-Smirnov test，分析不同成長期的九孔苗對微藻類的攝食偏好性，結果依序為舟形藻、菱形藻及細柱藻 (Cylindrotheca sp.) (p < 0.05)。半舟形藻 (Seminavis sp.) 和直鏈藻 (Melosira sp.) 則因發育期而有所差異，前者在3日齡，後者在20日齡的九孔苗的腸道中的比例明顯的高於其他時期 (p < 0.01)。

This study was to investigate the algae preference of small abalone (Haliotis diversicolor) on the rearing plates. There were 22 genus in plates. Among them, 19 were diatoms and others were green algae (Choroomonas sp., Dilabifilum sp. and Ulvaria sp.) The distribution and composition of algae were different on the upper and lower parts of the plates. The dominant algae were Nitzschia sp., Synedra sp., Navicula sp., Diploneis sp., Cocconeis sp., Achnanthes sp. and Amphora sp. in order. By using one-way ANOVA and Kolmogorov-Smirnov test, the preference for ingested algae of post larvae were Navicula sp., Nitzschia sp., and Cylindrotheca sp. with significantly different (P<0.05). The feeding order was similar among 3, 7 and 20-days-old post larvae. However, Seminavis sp. in 3-days-old post larvae, and Melosira sp. in 20-days-old post larvae both were higher than that of other stages. These results suggested that the post larvae had preference to the benthic diatoms in various development stages.