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Little empirical evidence exists that didymo infestations have negatively affected salmonid populations.
Otoliths of juvenile and adult salmonids were distinguished on the basis of otolith and bone sizes.
Some studies have suggested that the absence of salmonid bones may have indicated that salmonids were rare or were present in large numbers only unpredictably and inconsistently, that standard archaeological processing techniques might miss fine fish bones, that Native Americans may have consumed or pulverized fish at the sites where they were caught rather than move them intact to villages, or that salmonid bones may not have preserved as well as those of other fish species (Glassow 1979; Gobalet et al.
Specifically, we focus on the cases of two salmonids in two distinct settings: Chinook salmon (Oncorhynchus tshawytscha) in the Klamath River of southern Oregon and northern California, and steelhead trout (Oncorhynchus my kiss) in the John Day River of north-central Oregon.
Salmonids and talk about their environmental requirements and analysis:
Salmonid Cases, 2010 WL 2011016, at *4-6 (noting the Sacramento River winterrun Chinook, the Central Valley spring-run Chinook, and the Central Valley Steelhead are all "not viable" at this time, and that "the risk of extirpating" one population of the Steelhead "is very high").
The Umatilla have been at the forefront of calling for restoration of the Pacific lamprey, but have not been able to get the fish, which has no commercial fishery, targeted for conservation, as are many salmonid populations listed as endangered or threatened under the Endangered Species Act.
In September-October 2007, 18 specimens of salmonids were captured by electro-fishing single run depletion in the Siesartis River for radio telemetry studies.
Coho salmon (Oncorhynchus kisutch), like most salmonids, need cool water for rearing, and they typically reside in a stream for a minimum of one year after hatching.
Plans also call for a deck that allows light to shine through it so it will not aid predatory fish attacks on young salmonids.
Elevated concentrations of zinc in water are known to be toxic to aquatic organisms, in particular many species of algae, crustaceans and salmonids.
58 of the Estonian Minister of the Environment from 9 October 2002 "Requirements for the quality and monitoring of waterbodies protected as habitats for salmonids and cyprinids and stations of national environmental monitoring of salmonids and cyprinids" and the EU Directive on Habitats of Freshwater Fish (78/659/EEC) specify also limit values for the concentrations of heavy metals (Cu, Zn), oil products, and phenols.