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  •   SEAFDEC Institutional Repository (SIR)
  • 01 SEAFDEC Publications
  • 05 Technical Publications and Reports on Fishery Resources
  • Species under International Concerns
  • Species under International Concerns (SEAFDEC/AQD)
  • Proceedings of the Regional Technical Consultation on Stock Enhancement for Threatened Species of International Concern
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Biology and status of aquaculture for giant clams (Tridacnidae) in the Ryukyu Islands, southern Japan

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IwaiK2006.pdf (1.614Mb)
Date
2006
Author
Iwai, Kenji
Kiso, Katsuhiro
Kubo, Hirofumi
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Abstract
The Ryukyu Islands consist of many islands located between Kyushu in mainland Japan and Taiwan. The islands in the south-western area of the Ryukyu Islands belong to the Okinawa Prefecture. The Ryukyu Islands are strongly affected by the Kuroshio Current and are renowned for their coral reefs with high diversity of tropical and subtropical species. Giant clams traditionally have been utilized as fisheries resources for a long time in this area. According to fisheries statistics, catches of Tridacna crocea in Okinawa have decreased drastically during the last 30 years and currently are less than one tenth of previous catches. Fishing can easily deplete stocks of giant clams because the clams inhabit shallow waters and take at least three years to attain sexual maturity. Techniques for the mass seed production and aquaculture of three species (T. crocea, T. squamosa, and T. derasa) were established in Okinawa. Four hundred thousand seeds of giant clams of 8 mm shell length (SL) are supplied to fishermen for use in aquaculture or stock enhancement every year. This paper will review the (1) biology of giant clams, (2) present status of aquaculture of giant clams in Okinawa, and (3) other studies on giant clams in southern Japan.
URI
http://hdl.handle.net/10862/2931
Suggested Citation
Iwai, K., Kiso, K., & Kubo, H. (2006). Biology and status of aquaculture for giant clams (Tridacnidae) in the Ryukyu Islands, southern Japan. In J. H. Primavera, E. T. Quinitio, & M. R. R. Eguia (Eds.), Proceedings of the Regional Technical Consultation on Stock Enhancement for Threatened Species of International Concern, Iloilo City, Philippines, 13-15 July 2005 (pp. 27-38). Tigbauan, Iloilo, Philippines: Aquaculture Department, Southeast Asian Fisheries Development Center.
Subject
clam culture ASFA; bivalve culture ASFA; clam fisheries ASFA; spat ASFA; Marine aquaculture; seed (aquaculture) ASFA; seed production ASFA; stocking (organisms) ASFA; transplantation ASFA; biology ASFA; functional morphology ASFA; classification ASFA; taxonomy ASFA; Habitat; life cycle ASFA; molluscan larvae ASFA; Japan; Tridacna derasa; Tridacna crocea; Tridacna squamosa; Tridacna maxima; Hippopus hippopus
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  • Proceedings of the Regional Technical Consultation on Stock Enhancement for Threatened Species of International Concern [17]

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