Biology and status of aquaculture for giant clams (Tridacnidae) in the Ryukyu Islands, southern Japan
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日付
2006Page views
2,798主題
clam culture
bivalve culture
clam fisheries
spat
mariculture
seed (aquaculture)
seed production
stocking (organisms)
transplantation
biology
functional morphology
classification
taxonomy
habitats
life cycle
molluscan larvae
Japan
Tridacna derasa
Tridacna crocea
Tridacna squamosa
Tridacna maxima
Hippopus hippopus

bivalve culture

clam fisheries

spat

mariculture

seed (aquaculture)

seed production

stocking (organisms)

transplantation

biology

functional morphology

classification

taxonomy

habitats

life cycle

molluscan larvae

Japan

Tridacna derasa

Tridacna crocea

Tridacna squamosa

Tridacna maxima

Hippopus hippopus

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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.
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.
Type
Conference paperISBN
9789718511794
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