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排序方式: 共有417条查询结果,搜索用时 15 毫秒
411.
Khiem Nguyen Minh Takahashi Yuki Oanh Dang Thi Hoang Hai Tran Ngoc Yasuma Hiroki Kimura Nobuo 《Fisheries Science》2020,86(4):673-683
Fisheries Science - Predicting the outbreak of disease is essential when managing shrimp farms. Acute hepatopancreatic necrosis disease (AHPND) caused by Vibrio parahaemolyticus is a serious... 相似文献
412.
Kasai Akihide Takada Shingo Yamazaki Aya Masuda Reiji Yamanaka Hiroki 《Fisheries Science》2020,86(3):465-471
Fisheries Science - The environmental DNA (eDNA) technique is a convenient and powerful tool to detect rare species. Knowledge of the degradation rate of eDNA in water is important for... 相似文献
413.
Yutaro Sakai Hiroki Wakamatsu Tsutom Miyata 《Aquaculture Economics & Management (Blackwell Science)》2019,23(1):28-44
The risk of norovirus food poisoning from oyster consumption can be minimized by consumers, as thorough cooking can destroy norovirus. This paper uses data from 23 prefectures in Japan during 1970–2010 to examine how the demand for oysters responds to this manageable risk. We find that the incidence rate of norovirus has no effect on the price of oysters in prefectures that specialize in oysters for cooking, whereas it has significant negative impacts in prefectures that produce oysters to be eaten raw. These results indicate that consumers respond differently to manageable and non-manageable risks. 相似文献
414.
Orino Kazuki Ishigane Kosuke Suzuki Kota Izumiura Hiroki Nakaya Mitsuhiro Takatsu Tetsuya 《Fisheries Science》2019,85(4):705-716
Fisheries Science - The brittle star Ophiura sarsii with a disc diameter (DD) of less than 9 mm is an important prey item for flathead flounder Hippoglossoides dubius in Funka... 相似文献
415.
Shigeru Katayama Toshihiro Nishio Zensuke Iseya Hideki Kishimura Hiroki Saeki 《Fisheries Science》2009,75(2):491-497
A highly viscous polysaccharide solution was extracted from Gagome Kjellmaniella crassifolia in 20°C water. The eluted sugar concentration was 0.16%, and the extracted carbohydrates consisted of fucoidan, laminaran,
and alginate at an approximately ratio of 8.2:0.8:1.0. An increase in the extraction temperature resulted in a less viscous
solution, even though the amount of eluted sugar was higher than that obtained at a lower temperature. The most viscous extraction
solution was obtained at a neutral pH, with a more acidic or alkaline extraction solution being a less viscous. When the
highly viscous polysaccharide solution was heated, the viscosity decreased markedly with increasing temperature. The viscosity
of the polysaccharide solution increased after dialysis against water and decreased with the addition of either KCl or NaCl.
However, the viscosity was recovered to previous levels by following re-dialysis against water. The removal of divalent cations
by EDTA and the re-addition using CaCl2 or MgCl2 also caused reversible changes to the viscosity. These characterizations will be useful for widespread applications of viscous
K. crassifolia polysaccharides. 相似文献
416.
Tetsuro Shiraishi Suvarna D. Ketkar Yoshiki Katoh Mitsuo Nyuji Akihiko Yamaguchi Michiya Matsuyama 《Fisheries Science》2009,75(3):649-655
Female Japanese chub mackerel Scomber japonicus of the Tsushima Current subpopulation were collected during the spawning season from March to May 2001. A total of 137 adult
females were caught between midnight and daybreak. A considerable number of fish displayed new postovulatory follicles (POF),
whereas there was no evidence of germinal vesicle breakdown or hydrated oocytes in any of the fish collected. This suggests
a daily spawning synchronicity toward midnight. To estimate the spawning frequency (S), the female reproductive state was classified into four criteria based on the degenerative stage of the POFs and the developmental
stage of the oocytes. To stage the POFs according to age and determine the stage duration, ovaries from S. japonicus were induced to spawn in the laboratory and were sampled 0–72 h after ovulation at appropriate intervals. The average S, which is evaluated from four different indices, was 16.9%, corresponding to the average female chub mackerel spawned every
5.9 days (8.5 times) during the 50 days. 相似文献
417.