Siebold's abalone (Nordotis gigantea), disk abalone (Nrodotis discus), and red sea cucumber (Holothroidea) in Fukuoka Prefecture.
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Accession number;03A0861607
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| Title;Siebold's abalone (Nordotis gigantea), disk abalone (Nrodotis discus), and red sea cucumber (Holothroidea) in Fukuoka Prefecture. |
| Author;
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Journal Title;Shigen Zodai Gijutsu Kaihatsu Jigyo Hokokusho Heisei 14 Nendo Chisengata Teichakuseishu (Dansuiiki) Gurupu
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Journal Code:N20032570
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ISSN:
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VOL.;NO.;PAGE.FUKUAWABI1(1),FUKUAWABI1-FUKUAWABI18,FUKUNAMAKO1-FUKUNAMAKO14(2003)
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| Figure&Table&Reference; |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;Released groups of 30 mm long Siebold's abalones (Nordotis gigantea) tended to catch up in growth with those larger than 35 mm in 8-10 months after release. There was a large difference in daily growth in June, or two months after release in April, between 71.9 .MU.m for a release group of 30 mm abalones and 47.3 .MU.m for a release group of 40 mm abalones. It was suggested that disk abalone (Nordotis discus) could be reared even in high densities by raising light shielding rate and regulating water flow. Shell length exceeded 30 mm 242 days later in a plot with less than 10,000 pieces/m2 when light shielding rate was 100% and 273 days later in a plot of the same density when light shielding rate was 60%. However, when rearing cages with high densities were present in a water tank, there were cases in which deaths in one of the high density cages affected other cages and deaths and poor growth spread in the whole water tank. An egg collection test by initiation time of the secondary rearing of parents used for egg collection in the preceding year and a gonad maturity survey were conducted for red sea cucumber (Holothroidea). A test plot initiated in March yielded results equivalent ot those of a group collected in this year. Red sea cucumber parents were reared by effective feed and binder and an excellent result was obtained with ribik + mashed potato. Insemination stimulation by incision in addition to ordinary stimulation for inducing oviposition improved the rate of inducement. Results were given concerning seed production and intermediate culture of juvenile sea cucumber. |
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