open access

Vol 49, No 3 (2011)
Original paper
Submitted: 2012-01-05
Published online: 2011-10-28
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Reproductive biology of the endangered percid Zingel asper in captivity: a histological description of the male reproductive cycle

Christine Chevalier, Christine de Conto, Jean-Marie Exbrayat
DOI: 10.5603/FHC.2011.0069
·
Folia Histochem Cytobiol 2011;49(3):486-496.

open access

Vol 49, No 3 (2011)
ORIGINAL PAPERS
Submitted: 2012-01-05
Published online: 2011-10-28

Abstract

The endemic Rhodanian percid Zingel asper (Linnaeus, 1758), is usually found throughout the Rhône basin, but this fish is now in sharp decline. Understanding its reproductive physiology is important so as to be able to artificially control its reproduction with a view to re-introducing it. This study was carried out on a population obtained by artificial fertilization and bred in external tanks. Fishes were observed from the juvenile stages through to adulthood. Patterns of testicular development were defined from histological observations. Testes of Z. asper were paired, elongated and fusiform dorsocaudal organs. The two lobes of each gonad joined together to form a duct that extended to the urogenital papillae. They showed a lobular structure. The testicular lobules were of the unrestricted spermatogonial type. Up to 10 months-old, most of the males were immature: their testes showed only type A spermatogonia. The appearance of type B spermatogonia in the lobules of a testis indicated the beginning of spermatogenesis in 10 months-old fish. Spermiogenesis occurred 24 months after the fertilization and, in 26 months-old fish, the cyst opened and released spermatozoa into the lumen of lobules. The spermiation belonged to a cystic type. During the third year, histological observations pointed to the same evolution of adult gonads as during the second year. Sexual maturity was reached in captive Z. asper after two years. The spawning occurred in May in the breeding conditions. (Folia Histochemica et Cytobiologica 2011, Vol. 49, No. 3, 486–496)

Abstract

The endemic Rhodanian percid Zingel asper (Linnaeus, 1758), is usually found throughout the Rhône basin, but this fish is now in sharp decline. Understanding its reproductive physiology is important so as to be able to artificially control its reproduction with a view to re-introducing it. This study was carried out on a population obtained by artificial fertilization and bred in external tanks. Fishes were observed from the juvenile stages through to adulthood. Patterns of testicular development were defined from histological observations. Testes of Z. asper were paired, elongated and fusiform dorsocaudal organs. The two lobes of each gonad joined together to form a duct that extended to the urogenital papillae. They showed a lobular structure. The testicular lobules were of the unrestricted spermatogonial type. Up to 10 months-old, most of the males were immature: their testes showed only type A spermatogonia. The appearance of type B spermatogonia in the lobules of a testis indicated the beginning of spermatogenesis in 10 months-old fish. Spermiogenesis occurred 24 months after the fertilization and, in 26 months-old fish, the cyst opened and released spermatozoa into the lumen of lobules. The spermiation belonged to a cystic type. During the third year, histological observations pointed to the same evolution of adult gonads as during the second year. Sexual maturity was reached in captive Z. asper after two years. The spawning occurred in May in the breeding conditions. (Folia Histochemica et Cytobiologica 2011, Vol. 49, No. 3, 486–496)
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Keywords

Zingel asper; testis development; sexual maturity; reproductive cycle; histology

About this article
Title

Reproductive biology of the endangered percid Zingel asper in captivity: a histological description of the male reproductive cycle

Journal

Folia Histochemica et Cytobiologica

Issue

Vol 49, No 3 (2011)

Article type

Original paper

Pages

486-496

Published online

2011-10-28

DOI

10.5603/FHC.2011.0069

Bibliographic record

Folia Histochem Cytobiol 2011;49(3):486-496.

Keywords

Zingel asper
testis development
sexual maturity
reproductive cycle
histology

Authors

Christine Chevalier
Christine de Conto
Jean-Marie Exbrayat

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