Measurment of the Velocity at the Nares of the Olfactory Organ of Fishes with a Laser Velocimeter
The flow of water through the olfactory organ of fishes is of interest in order to understand the first step in the process of olfaction: the way molecules are brought to transmit information about their nature to the receptor cells in the sensory epithelium of the organ. The olfactory organ of fishes demonstrates the great variability that is found within specialized organs due to the adaptation process in different species to diverse environmental and behavioural conditions. The understanding of the evolution of such a specialized organ may throw some light on the evolution of determinate taxonomic groups. This implies that the influence of the morphological details of the organ on the flow has to be understood. The group selected for the present investigation are the so called Cyprinodonts. Their olfactory organs show evolutionary divergence in several different directions. Two species, Aplocheilus lineatus and Xiphophorus helleri were selected for the first investigations. In addition to measurements in vivo it is the idea to reproduce their olfactory organs as a model at a scale enlarged by a factor of about 200.
KeywordsPhoton Correlation Spectroscopy Specialized Organ Behavioural Condition Mucus Layer Short Fraction
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