Use of natural trophic resources by Eastern oysters and Pacific oysters of different ploidy  

作　　者：Darien D.Mizuta Gary H.Wikfors Shannon L.Meseck Yaqin Li Mark S.Dixon Hyun Jeong Lim In Joon Hwang MagalíBazzano Steven Pitchford 

机构地区：[1]Northeast Fisheries Science Center(NEFSC),NOAA,212 Rogers Ave,Milford,CT,06460,USA [2]East Sea Fisheries Research Institute,National Institute of Fisheries Science,Gangneung,25435,South Korea [3]West Sea Fisheries Institute,National Institute of Fisheries Science,Incheon,22383,South Korea

出　　处：《Aquaculture and Fisheries》2021年第1期75-83,共9页渔业学报（英文）

基　　金：This work was funded by NOAA Internal Competitive Aquaculture Grant,by the South Korean National Institute of Fisheries Science(R2018012);a JPA project between the U.S.and South Korea,and by a fellowship award from the United States National Academy of Sciences.

摘　　要：Ploidy manipulation,such as triploidy,in farmed oysters has been used as a tool to enhance oyster quality throughout all seasons because triploid oysters allocate less energy to gametogenesis,and therefore are deemed better performers than fertile diploids.Nevertheless,scientific reports describing no differences between ploidies and,in certain conditions,disadvantages of triploids are not uncommon.As the use of triploid oyster seed increases culture cost for growers,consistency in performance of triploids is considered to be an important goal.Thus,research to assess how ploidy affects physiological processes underlying oyster performance is fundamental for the aquaculture industry.This work was undertaken to assess if ploidy-based differences in performance in the two most commonly cultivated commercial species of oyster in the United States,Crassostrea virginica and Crassostrea gigas,are associated with filtration,feeding,and metabolism.To test this hypothesis,biodeposition measurements were made with oysters exposed to ambient water conditions at locations and seasons providing a variety of environmental conditions.Oysters did not show differences in filtration and feeding associated with ploidy,but physiological feeding variables fluctuated with environmental characteristics associated with spatial and seasonal differences.A preliminarily test of the hypothesis that differences in energy metabolism may account for differences in performance among ploidy levels indicates that basal metabolic rates of diploid,triploid,and tetraploid Eastern oysters are not different.

关 键 词：PLOIDY Farmed oysters Feeding BIODEPOSITION SESTON Metabolism 

分 类 号：S917.4[农业科学—水产科学]