【摘要】 测定了不同水温下毛蚶对5种单胞藻的滤除率、选择性和表观消化状况,结果表明,在16℃~24℃的水温范围内,毛蚶对海洋小球藻的滤除率逐步升高,24℃时的最大滤除率为1.849 4(mL/ind.min),24℃~26℃时的滤除率逐步下降。22℃为毛蚶对微绿球藻、球等鞭金藻3011和三角褐指藻的最佳滤食温度,最大滤除率分别为1.142 4、3.804 5和4.430 4。水温8℃~24℃之间,毛蚶对巴夫藻的滤除率变化不明显,平均滤除率为2.797 2。毛蚶不仅对不同大小、形状的藻类具有选择性,而且对大小、形状相似的藻类也具有明显的选择性。水温22℃下,毛蚶对5种单胞藻的表观消化状况不同。贝类对其滤除率大、消化状况差的藻类在促进贝类净化进程中有良好的应用参考价值。更多还原

【Abstract】 The effects of water temperature and microalgae on the filtration rates(FR) and the selectivity of the bloody clam Scapharca subcrenata were studied under laboratory conditions.The results showed that the FR of the bloody clam over the microalgae,Chlorella sp.was increased when the water temperature rose from 16 ℃ to 24 ℃,with a maximum FR of 1.849 4(mL/ind·min) at 24 ℃,while it was decreased when the temperature further increased from 24 ℃to 26 ℃.It was found that 22 ℃ was the optimal feeding temperature for the bloody clam to filter feed Nannochloropsis ocluata,Phaeodactylum tricornutum and Isochrusis galbana,with the maximum FR of(1.142 3,) 4.430 4 and 3.804 5(mL/ind·min) respectively.The FR of the bloody clam on Pavlova virdis did not show significant increase when the temperature rose from 8 ℃ to 24 ℃,with the average FR of 2.797 2(mL/ind·min).The bloody clam had selectivity not only on the sizes and shapes of algae,but also on the species of the same size and shape.Through the two-way significant variance analysis on the FR at different temperatures,it was found that Isochrusis galbana was more suitable for the bloody clam than P.virdis.The digestion of five species microalgae was different at 22℃.While Phaeodactylum tricornutum with the highest FR and lower digestive rate could be applied to the process of shellfish depuration.更多还原