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The fishes of Tillamook Bay

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  • Sampling with seine and trawl from May 1974 to November 1976 indicated that the species composition and distribution of fishes in Tillamook Bay through time is primarily related to the movements of marine species in and out of the estuary. Northern anchovy (Engraulis mordax), surf smelt (Hypomesus pretiosus), and shiner perch (Cymatogaster aggregata) accounted for over 70% of the total combined catch in the seine and trawl. The bay also serves as a nursery ground for juvenile Pacific herring (Clupea harengus pallasi), English sole (Parophrys vetulus), and starry flounder (Platichthys stellatus), and it may be important for rearing juvenile fall chinook (Oncorhynchus tshawytscha) and chum salmon (O. keta) prior to ocean entry. The maximum number and variety of fishes in Tillamook Bay occurred in the summer with a minimum during the winter. The lower bay was utilized most heavily, while the number of species and individuals declined with distance upriver. However, the upper bay was utilized extensively by juvenile shiner perch, starry flounder, and staghorn sculpin (Leptocottus armatus). Species present in the largest numbers throughout the year were generally the most widely distributed and presumably most tolerant of reduced salinities.
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