Reproductive cycle and plasma levels of steroids in male Eurasian perch Perca fluviatilis

• Published in: Aquatic living resources (Montrouge) 2000-03, Vol.13 (2), p.99-106
• Main Authors: Sulistyo, Isdy, Fontaine, Pascal, Rinchard, Jacques, Gardeur, Jean-Noël, Migaud, Hervé, Capdeville, Bruno, Kestemont, Patrick
• Format: Article
• Language: English
• Subjects: Biological and medical sciences; Cycle de reproduction; Fundamental and applied biological sciences. Psychology; hormones sexuelles; male; mâle; Non mammalian vertebrate reproduction; Perca fluviatilis; Reproductive cycle; sex hormones; steroids; stéroïdes; Vertebrates: reproduction
• ISSN: 0990-7440; 1765-2952
• DOI: 10.1016/S0990-7440(00)00146-7

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 (