Pacific salmon hatcheries support important commercial fisheries for Pink Salmon Oncorhynchus gorbuscha and Chum O. keta in Prince William Sound (PWS), Alaska. State policy mandates that hatchery-produced fish must not negatively impact natural populations, which can occur during mixed via ecological genetic interactions. Therefore, we quantified the spatial temporal overlap of natural- hatcher...

a USDA/ARS Small Grains and Potato Germplasm Research Unit, Hagerman Fish Culture Experiment Station, 3059 F National Fish Hatchery Road, Hagerman, ID 83332, USA b USFWS Bozeman Fish Technology Center, Bozeman, MT, 59715, USA c Department of Fish and Wildlife Resources and the Aquaculture Research Institute, University of Idaho, Moscow, ID 83844, USA d Department of Animal and Veterinary Scienc...

Billions of hatchery salmon smolts are released annually in an attempt to mitigate anthropogenic impacts on freshwater habitats, often with limited success. Mortality of wild and hatchery fish is high during downstream and early ocean migration. To understand changes that occur during migration, we examined physiological and endocrine changes in Atlantic salmon (Salmo salar) smolts during hatch...

Soluble antigen of Renibacterium salmoninarum (Rs) was detected by a polyclonal enzyme-linked immunosorbent assay (ELISA) at significantly higher prevalences in adult chinook salmon Oncorhynchus tshawytscha that matured in freshwater than in the same cohort of fish spawned after maturation in seawater. The cumulative results were consistent during 4 yr of comparison at the Little Port Walter Ha...

Sodium uptake rates were measured in wild and hatchery reared Norwegian brown trout (Salmo trutta) exposed to media of a range of pH. Sodium uptake was strongly dependent on external acidity, being reduced in media of low pH. Wild fish from the naturally acid R. Tovdal (S. Norway) were more tolerant of acid media than hatchery reared fish. The effects of increasing external sodium concentration...

Lake sturgeon (Acipenser fulvescens) is a species of conservation concern that has been stocked in several Great Lakes (North America) rivers. were extirpated the Ontonagon River Superior and stocking began 1998. In 2017, gametes collected from spawning lake (9 females, 36 males) caught at nearby Sturgeon ground, generating nine family groups using 1:4 mating design (n = 862). 2018, 3 females 1...

The present research was designed to study and compare the biochemical parameters in Labeo rohita due to exceptional nutritional value of this fish as a protein source in developing countries. The protein and heavy metal (Zn, Cu, Ni) activities were determined spectrophotometrically. The proximate analysis of L. rohita collected from different localities of Pakistan revealed that the protein (1...

Abstract Fisheries managers routinely use hatcheries to increase angling opportunity. Many operate as segregated programs where hatchery‐origin fish are not intended spawn with natural‐origin conspecifics in order prevent potential negative effects on the population. Currently available techniques monitor frequency which strays successfully wild rely either genetic differentiation between hatch...

Releases of hatchery-reared anadromous salmon into the North Pacific Ocean are currently estimated between 5 and 6 billion juveniles per year. Wild spawning salmon may produce an additional 4 to 5 times this number of juveniles. With as many as 25 billion juvenile Pacific salmon annually entering the ocean and currently producing over 1. 0 million mt of returning adults, salmon survival and pro...