Abstract
The discovery that the olfactory system of the anadromous sea lamprey is extremely sensitive to two unique bile acids (petromyzonol sulfate [PS] and allocholic acid [ACA]) produced by stream-resident larval conspecifics has lead us to hypothesize that these compounds function as a migratory pheromone. Here, we test whether lamprey release these bile acids to the water in quantities sufficient for them to function as a long distance attractant. Five experiments were conducted. First, high performance liquid chromatography (HPLC) of liver extracts from all three life history stages of this species established that only larvae produce PS and ACA; parasites and maturing adults produced no identifiable bile acids. Large quantities of PS and ACA were found in larval gall bladders. Second, HPLC analyses of larval lamprey holding waters established that recently-fed larvae held in the laboratory release these bile acids to the water, with PS being released at a rate of approximately 16 ng h−1 animal−1 and ACA at 5 ng h−1 animal−1. Fasted animals released little bile acid. Third, an investigation of bile acid release routes demonstrated that larvae release bile acids primarily via their feces. Fourth, a study of the stability of ACA and PS in river water found both to have a half-life of a day. Finally, theoretical extrapolations using these data suggest that PS and ACA are present in picomolar concentrations in lamprey streams, a concentration within the detection range of adults. In conclusion, these data demonstrate for the first time in a fish that bile acid release rates and modes are adequate for these compounds to have pheromonal function.
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Polkinghorne, C.N., Olson, J.M., Gallaher, D.G. et al. Larval sea lamprey release two unique bile acids** to the water at a rate sufficient to produce detectable riverine pheromone plumes. Fish Physiology and Biochemistry 24, 15–30 (2001). https://doi.org/10.1023/A:1011159313239
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DOI: https://doi.org/10.1023/A:1011159313239
- bile acid
- Petromyzon marinus
- pheromone
- sea lamprey