| Title | Residence and Growth of Juvenile Chum Salmon (Oncorhynchus keta) in Netarts Bay, Oregon |
| Publication Type | Thesis |
| Year of Publication | 1990 |
| Authors | Wilson, Matthew T. |
| Academic Department | Dept. of Fisheries and Wildlife |
| Degree | M. S. |
| Pagination | 42 p. |
| Date Published | 1990 |
| University | Oregon State University |
| City | Corvallis, Or. |
| Type of Work | Masters Thesis |
| Call Number | OSU Libraries: Internet Resources LD4330 1990 .W497, Guin Wilson, Digital Open Access |
| Keywords | chum salmon = Oncorhynchus keta, growth, habitats, hatchery salmonids, juvenile fish, Netarts Bay, spatial distribution, temporal distribution, theses |
| Abstract | Estuarine residence and growth of juvenile chum salmon (Oncorhynchus keta) from Netarts Bay, Oregon were estimated from daily-formed growth increments of sagittal otoliths which are distinguishable from accretion patterns formed during freshwater residence. Estuarine residence time was inversely related to the average size at which juvenile chum salmon entered Netarts Bay. Among fin-clipped, hatchery fish, large individuals disappeared from Netarts Bay more rapidly than smaller members of the same release group during the first 9 days of estuarine residence. This selective removal was not evident among creek-reared chum which were smaller than the fin-clipped fish. Size-related emigration explains this variation in residence time. Growth rates were estimated from back-calculations of fork length from otoliths. The growth rates of juvenile chum salmon in Netarts Bay (0.6 mm FL/d; 3.5% bw/d) were lower than growth rates in other estuaries where harpacticoid copepods were a major prey item. Juvenile chum salmon that entered the estuary early in the spring grew faster than those which entered later in the year, possibly because of lower water temperature and lower density of small (50 mm FL) chum during the early period. High water temperature reduced apparent growth rates by slowing growth and causing emigration of larger, faster-growing individuals. |
| Notes | Studied the length of time juvenile chum salmon were resident in Netarts Bay, and how much they grew when they were in the bay. Larger hatchery fish left the protection of the bay sooner than smaller fish. Native fish did not seem to move out into the ocean based on size. Fish grew less in warmer water. |
| URL | https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/9g54xm83g |
| Label | 1850 |
