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KMID : 0894520120160030205
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Development & Reproduction
2012 Volume.16 No. 3 p.205 ~ p.217
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Ovarian Cycle, the Biological Minimum Size and Artificial Spawning Frequency in Female Meretrix petechialis (Bivalvia: Veneridae) in Western Korea
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Jun Je-Cheon
Kim Yong-Min
Chung Jae-Seung
Chung Ee-Yung
Lee Ki-Young
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Abstract
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The ovarian cycle, the biological minimum size, and artificial spawning frequency by artificial spawning induction of the female hard clam, Meretrix petechialis, were investigated by histological observations and morphometric data. The ovarian cycle of this species can be classified into five successive stages: early active stage, late active stage, ripe stage, partially spawned stage, and spent/inactive stage. The spawning period was from June to September, and the main spawning occurred between July and August when the seawater temperature exceeds over 20°C. The biological minimum size (shell length at 50% of first sexual maturity) in females were 40.39 mm in shell length (considered to be two years of age), and all clams over 50.1 mm in shell length sexually matured. In this study, the mean number of the spawned eggs by spawning induction increased with the increase of size (shell length) classes. In case of artificial spawning induction for the clams > 40.39 mm, the number of spawned eggs from the clams of a sized class was gradually decreased with the increase of the number of the spawning frequencies (the first, second, and third spawning). In the experiments of artificial spawning induction during the spawning season, the interval of each spawning of this species was estimated to be 15-18 days (approximately 17 days).
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KEYWORD
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Meretrix petechialis, Ovarian cycle, First sexual maturity, Biological minimum size, Artificial spawning, Spawning interval
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