01998nas a2200181   4500008004100000050003700041245014500078210006900223260000900292300001000301490000700311520135800318653001601676653003901692653001401731100001601745856005501761       2001                        eng d  aOSU Libraries: Guin SH370.A1 J6100aComparison of the field performances of the "100% or natural" triploid Pacific oyster Crassostrea gigas with chemical triploids and diploids0 aComparison of the field performances of the 100 or natural tripl  c2001  ap.1960 v203 aFor about 3 years, the Whiskey Creek Shellfish Hatchery has been producing commercially a new kind of triploid Pacific Oysters (Crassostrea gigas) called "Natural" or "100%" triploid, made from the cross between regular diploids and tetraploids. The first advantage is that these "natural" triploids are always 100 percent triploid as verified by flow cytometry, insuring a high quality product for the customers. Hatchery seed was deployed in grow out bags at two different locations for a 26-month study to examine the growth performance (length, whole weight, meat weight) and gonadal development of the natural triploids, chemical triploids and diploids. The "natural" triploid outperformed both diploids and chemical triploids on most of the characteristics studied. The final length was increased by 7 to 9% in the natural triploids compared to the diploids, the whole weight improved by 30 to 40% and the meat weight by 19% in the most productive area. The "natural" triploids outperformed as well the chemical triploids, with an increase of 7% in length, 15% in whole weight and 18% in meant weight in the most productive area. No histological differences were detected between "natural" and chemical triploids, but their gametogenesis was significantly reduced when compared to the diploids for the females and to a lower extent, for the males.10aaquaculture10aPacific oyster = Crassostrea gigas10ashellfish1 aEudeline, B  uhttps://netarts.library.oregonstate.edu/node/13791