Utility of parentage-based tagging for monitoring Coho salmon () in the interior Columbia River basin.

By the 1980s, after decades of declining numbers in the mid-1900s, Coho salmon () were considered extirpated from the interior Columbia River. In the mid-1990s, the Confederated Tribes of the Umatilla Indian Reservation, the Confederated Tribes and Bands of the Yakama Nation, and the Nez Perce Tribe began successful reintroduction programs of Coho salmon upstream of Bonneville Dam, but which were initially sourced from lower Columbia River hatcheries. Here we present the first Coho salmon parentage-based tagging (PBT) baseline from seven hatchery programs located in the interior Columbia River basin, and two sites at or downstream of Bonneville Dam, composed of over 32,000 broodstock samples.

Partial-year continuous light treatment reduces precocious maturation in age 1+ hatchery-reared male spring Chinook Salmon (O).

Hatchery programs designed to conserve and increase the abundance of natural populations of spring Chinook Salmon O have reported high proportions of males precociously maturing at age 2, called minijacks. High proportions of minijacks detract from hatchery supplementation, conservation and production goals. This study tested the effects of rearing juvenile Chinook Salmon under continuous light (LL) on minijack maturation in two trials.