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1 January 2012 The Effects of 11-ketotestosterone on Occupation of Downstream Location and Seawater in the New Zealand Shortfinned Eel, Anguilla australis
Alvin Nugraha Setiawan, Matthew John Wylie, Erin Louise Forbes, Pieter Mark Lokman
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Abstract

The androgen 11-ketotestosterone (11KT) is associated with the physiological and morphological changes that occur during the transformation of sedentary (‘yellow’) freshwater eels (Anguilla spp.) into their migratory form (‘silver’) prior to their spawning migration in the ocean. In this study, we investigate the possible role of 11KT in modulating behaviors consistent with downstream migration; i.e., downstream and salinity preference in the New Zealand shortfinned eel (A. australis). Unlike silvering, 11KT did not induce preference for downstream locations, scored as presence at the downstream ends of 35 m raceways. Likewise, there was no evidence for increased salinity preference in 11KT-treated yellow eels, scored as preference for sea water over fresh water in a choice experiment. However, the 11KT treatment induced higher frequency of movements between fresh water and sea water, which may indicate restlessness.

© 2012 Zoological Society of Japan
Alvin Nugraha Setiawan, Matthew John Wylie, Erin Louise Forbes, and Pieter Mark Lokman "The Effects of 11-ketotestosterone on Occupation of Downstream Location and Seawater in the New Zealand Shortfinned Eel, Anguilla australis," Zoological Science 29(1), 1-5, (1 January 2012). https://doi.org/10.2108/zsj.29.1
Received: 15 July 2011; Accepted: 1 August 2011; Published: 1 January 2012
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