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Eel Biology pp 331-349 | Cite as

The Physiology of Silvering in Anguillid Eels: Androgens and Control of Metamorphosis from the Yellow to Silver Stage

  • P. Mark Lokmanl
  • Detlef H. Rohr
  • Peter S. Davie
  • Graham Young

Abstract

The onset of puberty heralds a significant change in the life of anguillid eels. The hypothalamo-hypophysial-gonadal axis is activated, and a suite of morphological, biochemical, and behavioral changes occurs in preparation for a long return migration to specific, but generally poorly known, oceanic spawning areas. These changes, collectively referred to as “silvering,” are dramatic enough to be recognized not simply as the development of secondary sexual characteristics but as components of a true metamorphosis (Petersen 1896; D’Ancona 1960; LecomteFinger 1990). The nature of these changes and the physiological mechanisms that mediate them form the subject matter of this chapter. The term silvering is used here to refer to the processes that transform an immature, feeding (yellow) eel into a maturing, migratory (silver) eel.

Keywords

Pituitary Homogenate Anguilla Rostrata Unique Life History Swim Bladder Wall Silver Stage 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

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Copyright information

© Springer-Verlag Tokyo 2003

Authors and Affiliations

  • P. Mark Lokmanl
    • 1
  • Detlef H. Rohr
    • 3
  • Peter S. Davie
    • 3
  • Graham Young
    • 2
  1. 1.Department of ZoologyUniversity of OtagoDunedinNew Zealand
  2. 2.Department of Marine ScienceDunedinNew Zealand
  3. 3.Institute of Veterinary, Animal and Biomedical SciencesMassey UniversityPalmerston NorthNew Zealand

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