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Meiotic chromosome behaviour in male triploid transparent coloured crucian carp, Carassius auratus L.
Author(s) -
Gui J. F.,
Jia J.,
Liang S. C.,
Jiang Y. G.
Publication year - 1992
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1992.tb02660.x
Subject(s) - crucian carp , biology , carassius auratus , meiosis , zoology , chromosome , carassius , carp , ploidy , genetics , fishery , fish <actinopterygii> , gene
Meiotic chromosome behaviour was investigated by surface‐spreading, air‐drying and thin sectioning testes for light and electron microscope examination in artificial triploid transparent coloured crucian carp ( Carassius auratus L.) produced by hydrostatic pressure shock. Unsynapsed univalents, synapsed bivalents and partially synapsed trivalents could be observed and distinguished from each other in the surface‐spread spermatocytes. The pairing of the partially paired trivalents mainly occurred in the telomeric regions. Similarly, lateral elements of unsynapsed univalents, typical synapsed bivalents and triple pairing configurations having three lateral elements and two central elements in the trivalents were also observed in the thin sectioned pachytene spermatocytes. The metaphase I cells were mainly composed of univalents, bivalents and trivalents, but a few tetravalents, pentavalents and hexavalents were also found. The relationship between disturbed chromosome pairing and abnormal spermatogenesis is briefly discussed.