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Seasonal concentrations of reproductive steroids in the gonads of the atlantic hagfish, Myxine glutinosa by Mickle L. Powell; Scott I. Kavanaugh; Stacia A. Sower is a Environmental Science article available to read on EtoBox.

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## Abstract Changes in gonadal morphology, gonadal estradiol, and progesterone were examined in Atlantic hagfish, __Myxine glutinosa__, during a period of 17 months, beginning in April, 2001. Atlantic hagfish were captured from the ocean on a monthly basis. A total of 60 hagfish were divided into three different size classes of twenty hagfish each (small 20–35 cm, medium 35–45 cm, large 45–55+cm) and transported to the University of New Hampshire for sampling. Overall, in the medium and large size hagfish, estradiol and progesterone had significantly elevated peaks in January, 2001. There were significant increases in estradiol concentrations in January, with relatively low fluctuations in levels for the rest of the sampling period. Progesterone concentrations increased significantly in January, 2002, in medium and large hagfish, and remained elevated until June and April, 2002, for the two size classes respectively. The majority of hagfish sampled were females or hermaphrodites; few true males were identified in any of the samples. The number of females with large eggs increased following the estradiol peak in January and hermaphrodites with mature sperm were identified in the Jul

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Author

Mickle L. Powell; Scott I. Kavanaugh; Stacia A. Sower

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0022-104X)

Published

2004

Language

EN

Field

Environmental Science (Life Sciences)