Artificial induction of spawning and optimal condition for seed production of the brackish water bivalve Corbicula japonica in the Teshio River and Lake Panke [Japan]

Corbicula japonica in Teshio River and Lake Panke is an important fishery resource for Teshio Town in Northern Hokkaido. Of late, however, natural stocks have been decreasing. In order to establish a protocol for the artificial production of bivalve seed, we therefore investigated the annual reprodu...

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Published inAquaculture Science Vol. 56; no. 2; pp. 211 - 219
Main Authors Sasaki, Y.(Hokkaido. Fish Hatchery, Nakashibetsu (Japan). East Research Branch), Mizuno, S, Imada, K, Moriyama, Y, Yoshida, Y, Adachi, S
Format Journal Article
LanguageJapanese
English
Published Japanese Society for Aquaculture Science 20.06.2008
Subjects
ANIMAL TISSUES
Artificial larva
BIVALVIA
BIVALVO
CORBICULA JAPONICA
GENITALIA
INDUCED OVULATION
MADURACION
MATURATION
OVIPOSICION
OVIPOSITION
OVULACION INDUCIDA
OVULATION INDUITE
PONTE
PRODUCCION DE SEMILLAS
PRODUCTION DE SEMENCES
REPRODUCCION SEXUAL
REPRODUCTION SEXUEE
SEED PRODUCTION
SEXUAL REPRODUCTION
Spawning season
Survival rate
TEJIDOS ANIMALES
TISSU ANIMAL
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Summary:Corbicula japonica in Teshio River and Lake Panke is an important fishery resource for Teshio Town in Northern Hokkaido. Of late, however, natural stocks have been decreasing. In order to establish a protocol for the artificial production of bivalve seed, we therefore investigated the annual reproductive cycle, determined the optimal environmental conditions for artificial propagation and identified the season in which survival of captive-bred larvae was highest. The soft tissue index (soft tissue weight x 100/total weight) and the gonad index (gonad weight x 100/total weight) gradually increased from June to July, and sharply declined in early July. Judging from histological observations of the gonads, spawning occurred in early July. The artificial spawning was most successful at 5 psu and water temperature 25degC. Among spawnings set up between early July and early August, the captive-bred larvae produced in early July showed the highest survival rate. These results indicate that the survival of captive-bred larvae is dependent on the time of year when artificial spawning is undertaken.
Bibliography:M40
2008006289
L53
M12
ISSN:0371-4217
2185-0194
DOI:10.11233/aquaculturesci.56.211