Abstract
In fish the neuromasts of the lateral line develop as follows: a “migrating primordium” (MP) migrates from the postotic placode along the future posterior lateral line canal to the tail fin. Its placodal cells are assumed to be the basis for the development of the neuromasts. However, an MP was not found in all fish, e.g., in catfish. In the present study, a search was made for the MP in the larvae of the catfish Silurus glanis. Using light and electron microscopy, an MP was found to migrate along the ventral rim of the tail. It precedes the formation of a ventral row of free neuromasts. An MP preceding the main lateral row of the future canal neuromasts was not found. The necessity of the MP for the ventral-free neuromast development is shown by making incisions which block its migration. The result: caudal to the incision site neuromasts do not develop. On the other hand, the same incision procedure applied to the assumed migration route of a—hypothetical—lateral MP does not block the development of the lateral neuromasts. It is concluded that in this case an MP is not necessary for the development of the canal neuromasts.
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Acknowledgments
The author thanks Alain Ghysen and Dora Sapède, University of Montpellier, for collegial help in research, George Boyan for help with Englisch style, Jindra Cihakova and Regine Pahl for technical assistance, and the commercial breeders Dr. Proske, Uehlfeld, and Mr. Ottolübker, Ahrenhorster Edelfish, for repeated free supply of fertilized Silurus eggs.
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Roth, A. Development of the lateral line mechanoreceptors in the catfish Silurus glanis . Naturwissenschaften 97, 645–653 (2010). https://doi.org/10.1007/s00114-010-0680-0
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DOI: https://doi.org/10.1007/s00114-010-0680-0