02162nas a2200217 4500008004100000050008900041245008000130210006800210250001000278260004300288300001000331520134200341653001801683653004601701653001301747653001601760653003901776653001101815100002801826856009001854 1972 eng d aOSU Libraries: Internet Resources LD4330 1972 .S66, Guin Squire, Digital Open Access00aThe Japanese Oyster Drill, Ocenebra japonica, in Netarts Bay, Oregon0 aJapanese Oyster Drill iOcenebra japonicai in Netarts Bay Oregon aM. S. aCorvallis, ORbOregon State University a65 p.3 a It has been shown that large localized population of Ocenebra japonica exists on a sandy low tide island in the tail of Netarts Bay. Introduced with Crassostrea gigas planted in the 1930's, the Japanese drill lives in association with relict oysters left behind by the defunct industry. Data from spat-baited traps furnished an index of distribution, and indicated the drills may move outward and downward in the summer, returning to the relicts for protection from winter weather when temperatures fall. Snails fed mono-specific diets of C. gigas, cockles (Clinocardium nuttalli), and Olivella biplicata were tested to determine prey preference. Naive (field) and starved specimens were also tested, and statistical comparison of these results demonstrated prey preference could be dietetically altered, and confirmed that C. nuttalli was the chief prey item in the field. A single spring spawning was noted, but few juvenile drills (< 18 mm) were recorded. The presence of numerous small prey- - some of which had been drilled- -and of a population distribution similar to literature reports indicate the population is viable. Fifty-three juveniles grew an average of 8. 76 mm in 85 days of unrestricted feeding. Local control measures for this potentially serious pest are discussed.10ainvertebrates10aJapanese oyster drill = Ocenebra japonica10amolluscs10aNetarts Bay10aPacific oyster = Crassostrea gigas10atheses1 aSquire, Douglas Richard uhttps://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/3t945v39g