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    Reproductive Cycle and Plasma Sex Steroid Profiles in Male Eurasian Perch Perca Fluviatilis

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    Author
    Sulistyo, Isdy
    Fontaine, Pascal
    Rinchard, Jacques
    Gardeur, Jean-Noel
    Migaud, Herve
    Capdeville, Bruno
    Kestemont, Patrick
    Keyword
    Reproductive Cycle
    Sex Hormones
    Steroids
    Male
    Perca Fluviatilis
    Journal title
    Aquatic Living Resource
    Date Published
    2000-01-01
    Publication Volume
    13
    Publication Issue
    2
    
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    URI
    http://hdl.handle.net/20.500.12648/2344
    Abstract
    From April 1995 to April 1996, the annual reproductive cycle of male Eurasian perch Perca fluviatilis was studied at the Lindre Center (Moselle, France). At monthly intervals, five males (mean body weight of 133 ± 43 g and total length of 175 ± 9 mm) were caught. From sampled organs, the gonadosomatic (GSI), hepatosomatic (HSI) and viscerosomatic indexes (VSI) were calculated and plasma testosterone (T) and 11-ketotestosterone (11KT) levels were measured. After the spawning period in mid-April, GSI and HSI dropped and VSI increased to 3.8 ± 0.1 %. In September, GSI reached its maximum (8.5 ± 1.8 %). At this time, spermatocytes, spermatids and spermatozoa were abundant, whereas in June only spermatogonia were observed. During winter, GSI was stable at approximately 5 %, HSI reached its maximum (1.9 ± 0.3 %) and VSI was low (2.6 ± 0.2 %). From April to November 1995, plasma T and 11KT concentrations were low (< 0.5 ng·mL–1). Plasma T levels increased significantly in December and reached peak levels (12.3 ± 2.1 ng·mL–1) in January, then decreased in February and increased again until spawning in April (6.8 ± 2.1 ng·mL–1). This second elevation could be related to the beginning of a new spermatogenic cycle. Plasma levels of 11KT increased significantly from October to February 1996 (4.9 ± 1.1 ng·mL–1). From February to the spawning period (April 1996), plasma 11KT decreased significantly, but values were significantly higher than those measured in fall. Males were spermiating from January to spawning in April. © 2000 Ifremer/Cnrs/Inra/Ird/Cemagref/Éditions scientifiques et médicales Elsevier SAS
    Citation
    Sulistyo, I., Fontaine, P., Rinchard, J., Gardeur, J.N., Migaud, H., Capdeville, B. and Kestemont, P. 2000. "Reproductive Cycle and Plasma Sex Steroid Profiles in Male Eurasian Perch Perca Fluviatilis." Aquatic Living Resources 13(2): 99-106. Available on publisher's site at: http://www.alr-journal.org/
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    Copyright 2000 EDP Sciences
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    Environmental Science and Ecology Faculty Publications

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