Juvenile Movement among Different Populations of Cutthroat Trout Introduced as Embryos to Vacant Habitat

Andrews, Tessa M.; Shepard, Bradley B.; Litt, Andrea R.; Kruse, C.W.; Zale, Alexander V.; Kalinowski, Steven T.

doi:10.1080/02755947.2013.812582

Cited by 7 publications

(18 citation statements)

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“…Consistent with prior studies (Symons ; Cresswell ; Weber and Fausch ; Andrews et al. ), we found that NOR fish dispersed greater distances, with an estimated median dispersal distance of NOR parr almost 200% greater than that of HOR fish (Figure ). In addition to the possible role of density‐dependent competition, we speculate that this pronounced difference may have been influenced by selection for sedentary habits in multigeneration segregated hatchery broodstocks (Einum and Fleming ), environmental differences between the egg boxes and natural redds (e.g., egg incubation temperature, food availability, interactions with resident fish, etc.…”

Section: Discussionsupporting

confidence: 90%

In‐Stream Egg Incubators Produce Hatchery Chinook Salmon with Similarities to and Differences from Natural Juveniles

Conley

Ebel

Hargrove

et al. 2020

N American J Fish Manag

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Supplementing fish populations at the egg stage is a low‐cost alternative to hatchery rearing that is presumed to improve adaptation to local natural conditions. The Shoshone‐Bannock Tribes began supplementing Chinook Salmon Onchorynchus tschwytscha in Panther Creek, Idaho, at the eyed egg stage in 2014. The Chinook Salmon eggs were artificially fertilized and reared to eye‐up in the hatchery and then planted in custom‐made in‐stream incubators (egg boxes) for volitional release and natural rearing. Using data from three brood years, we evaluated the efficacy of this supplementation program solely in terms of juvenile production. We related juvenile production to the placement and retrieval of the egg boxes, assessed the relative contributions of offspring (parr and emigrants) from the egg boxes (HOR) to overall juvenile abundance, and compared the performance (length, condition, dispersal distance, and survival) of HOR versus natural‐origin (NOR) juveniles. Brood year and box placement within the stream (distance upstream) were the best predictors of whether or not an egg box was retrieved from its original location. Meanwhile, the condition of the box (i.e., intact, damaged, or missing) was the best single predictor of juvenile production. Supplemented eggs represented an estimated 42, 50, and 42% of the total egg deposition in Panther Creek in brood years 2014, 2015, and 2016, respectively. A parentage analysis revealed that the egg boxes accounted for 6, 22, and 35%, respectively, of the parr production for the respective brood years when the data were normalized to the estimated egg deposition—less than the egg‐to‐parr production that was estimated for natural redds. As fall parr, the HOR fish differed from the NOR fish in terms of their length and dispersal behavior, but they were of similar length and condition at their emigration from Panther Creek and exhibited no significant difference in downstream survival through the Federal Columbia River Power System (FCRPS). Collectively, our results provide useful insights to fisheries managers who are interested in initiating or refining egg supplementation programs.

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Section: Discussionsupporting

confidence: 90%

In‐Stream Egg Incubators Produce Hatchery Chinook Salmon with Similarities to and Differences from Natural Juveniles

Conley

Ebel

Hargrove

et al. 2020

N American J Fish Manag

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“…Translocation or managed relocation may be a management option for facilitating range shifts for species that are restricted in their ability to move in response to climate change or other threats (Lawler and Olden 2011). Preserving population structure and diversity by using wild, most-closely-related populations in translocation efforts is important (Metcalf et al 2007(Metcalf et al , 2012, but hatchery supplementation of native species may provide a viable alternative in some cases (Andrews et al 2013). In addition, high-quality habitat is important for successful reintroductions (Cochran-Biederman et al 2014), although a thorough assessment is warranted to ensure success (Perez et al 2012).…”

Section: Managing Pacific Trout Across Changing Landscapesmentioning

confidence: 99%

Conservation of Native Pacific Trout Diversity in Western North America

et al. 2016

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Pacific trout Oncorhynchus spp. in western North America are strongly valued in ecological, socioeconomic, and cultural views, and have been the subject of substantial research and conservation efforts. Despite this, the understanding of their evolutionary histories, overall diversity, and challenges to their conservation is incomplete. We review the state of knowledge on these important issues, focusing on Pacific trout in the genus Oncorhynchus. Although most research on salmonid fishes emphasizes Pacific salmon, we focus on Pacific trout because they share a common evolutionary history, and many taxa in western North America have not been formally described, particularly in the southern extent of their ranges. Research in recent decades has led to the revision of many hypotheses concerning the origin and diversification of Pacific trout throughout their range. Although there has been significant success at addressing past threats to Pacific trout, contemporary and future threats represented by nonnative species, land and water use activities, and climate change pose challenges and uncertainties. Ultimately, conservation of Pacific trout depends on how well these issues are understood and addressed, and on solutions that allow these species to coexist with a growing scope of human influences. Conservación de la diversidad de truchas nativas del Pacífico en el oeste de NorteaméricaLa trucha del Pacífico Oncorhynchus spp. en el oeste de Norteamérica tiene un alto valor desde el punto de vista ecológi-co, socioeconómico y cultural, y ha sido objeto de importantes esfuerzos de conservación e investigación. A pesar de ello, el conocimiento que se tiene sobre su historia evolutiva, diversidad general y retos de conservación sigue siendo incompleto. Se hace una revisión del estado del conocimiento sobre estos puntos, con énfasis en la trucha del Pacífico dentro del género Oncorhynchus. Si bien la mayor parte de los estudios hechos sobre salmónidos se enfocan al salmón del Pací-fico, aquí nos enfocamos en la trucha del Pacífico ya que ambos groupos de especies comparten una historia evolutiva en común sobre todo en lo que se refiere al extremo sur de sus rangos de distribución. En investigaciones llevadas a cabo en décadas recientes, se han revisado varias hipótesis relativas al origen y diversificación de la trucha del Pacífico a lo largo de su rango de distribución. Aunque se han logrado identificar adecuadamente las amenazas pasadas que enfrentó la trucha del Pacífico, las amenazas actuales y futuras que representan especies no nativas, actividades de uso de tierra y agua y el cambio climático se consideran importantes retos e incertidumbres. Al final, la conservación de la trucha del Pacífico depende de qué tan bien se comprendan y abordan estos temas, y de las soluciones que les permitan a estas especies coexistir con una gama creciente de influencias humanas. Conservation de la diversité de la truite du Pacifique indigène dans l'ouest de l'Amérique du NordLes truites du Pacifique ou Oncorhynchus spp. dans l'ouest...

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“…the study area. Here we provide a brief summary of that information and add details for methods not discussed by Andrews et al (2013).…”

mentioning

confidence: 99%

“…We introduced about 35,000 Cutthroat Trout embryos from five different source populations to two different sites during each of 3 years for a total of six distinct introduction sites ( Figure 1). We chose these introduction sites to (1) spread fish throughout the watershed, (2) include sites with different temperature regimes (Table 1), and (3) enable selection of suitable habitat for remote-site incubators (RSIs; Andrews et al 2013) to ensure embryo survival (e.g., rocky substrate to stabilize buckets and enough gradient to keep water consistently running through the incubators). The first two sites (Cherry Lake Creek and Cherry Creek) were the farthest upstream.…”

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confidence: 99%

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Performance of Juvenile Cutthroat Trout Translocated as Embryos from Five Populations into a Common Habitat

Andrews¹,

Shepard

Litt³

et al. 2016

N American J Fish Manag

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The distributions of most native trout species in western North America have been severely reduced, and conservation of many of these species will require translocation into vacant habitats following removal of nonnative species. A critical question managers have is “Does it matter which donor sources are used for these translocations?” We present a case study that addressed this question for a large native trout translocation project in Montana. We introduced embryos from five source populations of Westslope Cutthroat Trout Oncorhynchus clarkii lewisi to a large, fishless watershed in Montana following removal of nonnative fish with piscicides. Source populations providing embryos for translocations were three nearby (<120 km) wild populations, the state of Montana's captive Westslope Cutthroat Trout hatchery conservation population (initiated 32 years ago using fish from wild populations located >350 km from the translocation site), and a population in captivity for one generation comprised of individuals from the three wild populations used as single sources for this project, which were variably crossed (59% within populations and 41% between populations) to provide embryos. We used remote‐site incubators at six different sites to introduce approximately 35,000 embryos from 400 genotyped parents. We later resampled and genotyped 1,450 of these individuals at age 1 and age 2. Juvenile survival for the more genetically diverse Montana Westslope Cutthroat Trout conservation population was twice as high as for other source populations, even though these other source populations were geographically closer to the translocation site than populations used to make the Montana Westslope Cutthroat Trout conservation population. Body weight for progeny from the two captive populations was higher than for progeny from wild source populations, and some differences were observed in body condition among source populations. Continued monitoring over several generations will be necessary to determine the eventual contributions of each source population and the relevance of these initial findings. Received October 9, 2015; accepted February 27, 2016 Published online July 20, 2016

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Juvenile Movement among Different Populations of Cutthroat Trout Introduced as Embryos to Vacant Habitat

Cited by 7 publications

References 50 publications

In‐Stream Egg Incubators Produce Hatchery Chinook Salmon with Similarities to and Differences from Natural Juveniles

In‐Stream Egg Incubators Produce Hatchery Chinook Salmon with Similarities to and Differences from Natural Juveniles

Conservation of Native Pacific Trout Diversity in Western North America

Performance of Juvenile Cutthroat Trout Translocated as Embryos from Five Populations into a Common Habitat

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