Fluid Dynamics of Suspension Feeding Fishes: An Empirical and Mathematical Analysis

尽管脊椎动物在生态和经济上的重要性 悬浮饲养者，颗粒截留假说 它们口腔内的机制很少被测试 脊椎动物过滤的流体力学 被模仿。 这个项目将开发一个数学模型 流场的周围和颗粒保留的鳃耙 黑鱼（鲤科），并将此模型应用于 太平洋鲱鱼（鲱鱼科）和北方凤尾鱼（鲱鱼科）。 使用光纤内窥镜和热敏电阻流量探头， 记录口腔内的第一图像和水流速度 脊椎动物悬浮喂食器的空腔，一个意想不到的 在blackfish中记录了过滤机制。 鳃耙， 假设是鱼类中颗粒滞留的部位， 黑鱼作为屏障，将载有颗粒的水引导到 粘液覆盖的口腔顶。 热敏电阻流量探头将提供 鲱鱼模型参数的经验值， 纤维内窥镜将确定是否 模型准确地预测了耙流的模式。 该模型将显示流速和耙 与耙的功能相关的形态 作为屏障与过滤器，并将适用于 鱼类种类和其他悬浮饲料的多样性。

Despite the ecological and economic importance of vertebrate suspension feeders, hypotheses about particle entrapment mechanisms inside their oral cavities have rarely been tested and the fluid mechanics of filtration by vertebrates has not been modelled. This project will develop a mathematical model of flow fields around and particle retention by the gill raker of blackfish (Cyprinidae), and will apply this model to Pacific herring (Clupeidae) and northern anchovy (Engraulidae). Using a fiberoptic endoscope and thermistor flow probe to record the first images and water velocities inside the oral cavity of a vertebrate suspension feeder, an unexpected filtration mechanism was documented in blackfish. Gill rakers, assumed to be the site of particle retention in fishes, act in blackfish as barriers that direct particle-laden water to the mucus-covered oral roof. A thermistor flow probe will provide empirical values for the model parameters in herring and anchovy, and a fiberoptic endoscope will establish whether the model accurately predicts the pattern of flow at the rakers. The model will indicate the flow velocities and raker morphologies that are associated with the functioning of rakers as barriers versus filters, and will be applicable to a diversity of fish species and other suspension feeders.