English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

In order to improve the pearl quality produced by autumn nucleus insertion in hybrid pearl oysters, we investigated the physiological condition of hybrid pearl oysters during the preconditioning period. Two-year-old hybrid pearl oysters were treated at the preconditioning stage and normal stage (control) and sampled at 0, 5, 9, 15, 19, 26, 30, 40 and 50 days after being treated. The sampled pearl oysters, in which a mantle graft and nucleus had been implanted, were measured for proximate composition and carbohydrate-metabolizing enzyme activity in the adductor muscle, and the produced pearls were evaluated. The glycogen content of the treated pearl oysters decreased from day 19 to the end of the experimental period. The enzyme activities of GPase, PFK and PK of the treated pearl oysters increased, whereas the MDH activity decreased from day 40 to day 50. The commercial pearl production rates () at day 5, 9, 15 and 19 were higher than at other days and the glycogen content was around 2. These results suggest that the glycogen content of the adductor muscle is a useful index of the preconditioning condition in hybrid pearl oysters at autumn nucleus insertion.

nihon suisan gakkaishi/nippon suisan gakkaishi

Influences of autumn preconditioning on proximate composition, carbohydrate-metabolizing enzyme activity of hybrid pearl oyster Pinctada fucata martensii and pearl quality