Diurnal Spermatogenesis and Spawning in the Secondary Male of a Protogynous Wrasse, Pseudolabrus japonicus (Teleostei, Labridae)

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The bambooleaf wrasse, Pseudolabrus japonicus, wxhibits diandric protogyny, and the secondary male performs pair spawning with a female who enters his territory. We examined diurnal spermato-genesis and spawning in the secondary male of a protogynous wrasse. In captivity, a single secondary male spawned daily over one month between 06 : 00 and 09 : 00 from October to November. Number of B-type spermatogonia and spermatocytes showed the lowest level at 00 : 00, increased gradually thereafter, peaked at 15 : 00, and decreased rapidly from 21 : 00 to 00 : 00. Spermatid number did not change significantly through-out the day. The number of spermatozoa increased gradually from 18 : 00. reached a mmaximum at 06 : 00, just prior to spawning, and thereafter decreased markedly at 09 : 00, after spawning. These results clearly showed that spermatogonial proliferation and meiosis occurred between 00 : 00 and 15 : 00, and spermiation occurred between 18 : 00 and 06 : 00. Thus, the secondary male of bambooleaf wrasse exhibits a diurnal rhythm of spermatogenesis and spermiation.
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