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Journal articles on the topic 'Salmonid stock monitoring'

Author: Grafiati

Published: 4 June 2021

Last updated: 15 February 2022

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1

Hedger, RD, OH Diserud, B. Finstad, et al. "Modeling salmon lice effects on sea trout population dynamics using an individual-based approach." Aquaculture Environment Interactions 13 (May 6, 2021): 145–63. http://dx.doi.org/10.3354/aei00397.

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Salmon lice Lepeophtheirus salmonis infestation of sea trout Salmo trutta results in both additional marine mortality and behavioral changes which may contribute to sea trout population decline. For effective management of activities that increase exposure to salmon lice, such as salmon aquaculture, it is necessary to have a full understanding of how salmon lice may affect sea trout populations. An individual-based model (IBTRUTTA) was therefore developed to investigate the potential effects of salmon lice infestation on sea trout population abundance and dynamics based on data from the River

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2

Skilbrei, Ove T., and Vidar Wennevik. "The use of catch statistics to monitor the abundance of escaped farmed Atlantic salmon and rainbow trout in the sea." ICES Journal of Marine Science 63, no. 7 (2006): 1190–200. http://dx.doi.org/10.1016/j.icesjms.2006.05.005.

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Abstract Catch statistics and scale samples were collected from a gillnet fishery targeting escaped farmed salmonids between 1 October and 28 February each year from 2001 to 2004 in Hordaland County, western Norway. Fish were classified into different groups, or escape incidents, using catch per unit effort (cpue) and size distribution of the catch from different geographical subregions. Reported escape incidents of both rainbow trout and salmon appeared to be followed by peaks in the cpue lasting four to six weeks, but a large proportion of the catch of escaped salmon appeared to stem from un

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3

Sittenthaler, Marcia, Lucia Koskoff, Kurt Pinter, Ursula Nopp-Mayr, Rosemarie Parz-Gollner, and Klaus Hackländer. "Fish size selection and diet composition of Eurasian otters (Lutra lutra) in salmonid streams: Picky gourmets rather than opportunists?" Knowledge & Management of Aquatic Ecosystems, no. 420 (2019): 29. http://dx.doi.org/10.1051/kmae/2019020.

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Knowledge on predator diet and drivers of prey selection is particularly of interest for an efficient management of predator and prey populations where predators potentially compete with humans for resources. Actual or perceived predation by Eurasian otter (Lutra lutra) on fish stocks generates conflicts in many countries. Recently, conflicts are heating up in riverine habitats, where multiple stressors affect stream fish populations. We combined dietary analysis of otter faeces and prey fish availability in three Austrian streams to assess spatial and seasonal differences in diet composition,

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4

Waples, Robin S. "Genetic interactions Between Hatchery and Wild Salmonids: Lessons from the Pacific Northwest." Canadian Journal of Fisheries and Aquatic Sciences 48, S1 (1991): 124–33. http://dx.doi.org/10.1139/f91-311.

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The potential for genetic interactions between hatchery and wild populations of salmonids in northwestern North America has increased considerably in recent decades. Efforts to mitigate severe losses to many wild stocks caused by overfishing, destruction of habitat, and blockage of migratory routes have focussed on boosting artificial production in public hatcheries. Opportunities for genetic interactions between hatchery and wild fish will increase if efforts to supplement wild production with hatchery-reared fish continue. Concerns center on three issues: (1) direct genetic effects (caused b

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5

Dorner, Brigitte, Randall M. Peterman, and Steven L. Haeseker. "Historical trends in productivity of 120 Pacific pink, chum, and sockeye salmon stocks reconstructed by using a Kalman filter." Canadian Journal of Fisheries and Aquatic Sciences 65, no. 9 (2008): 1842–66. http://dx.doi.org/10.1139/f08-094.

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Temporal trends in productivity of Pacific salmon ( Oncorhynchus spp.) stocks are important to detect in a timely and reliable manner to permit appropriate management responses. However, detecting such trends is difficult because observation error and natural variability in survival rates tend to obscure underlying trends. A Kalman filter estimation procedure has previously been shown to be effective in such situations. We used it on a Ricker spawner–recruit model to reconstruct indices of annual productivity (recruits per spawner (R/S) at low spawner abundance) based on historical data for 12

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Kolpakov, N. V., D. V. Kotsyuk, V. I. Ostrovsky, et al. "Modern state of aquatic biological resources of the Amur River basin and directions of their research." Izvestiya TINRO 200, no. 3 (2020): 499–529. http://dx.doi.org/10.26428/1606-9919-2020-200-499-529.

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Current status of aquatic biological resources in the middle and lower parts of the Amur River basin, including Lake Khanka and the Amursky Liman, is assessed. Generally high abundance of the water organisms is noted, but a downward trend is revealed. In 2015–2019, the total annual catch in the basin by Russian fishermen changed between 15.9–69.6 . 103 t (on average 39.1 . 103 t), with the main portions of pacific salmons (31.9 . 103 t, or 81.6 % of total catch) and smelts (5.5 . 103 t, 14.1 %). After the peak in 2016, the salmons abundance in the Amur has decreased, particularly for summer ch

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Shuntov, Vyacheslav P., Olga S. Temnykh, and Oleg A. Ivanov. "On steadyness of stereotypes in conceptions on marine ecology of pacific salmons (Oncorhynchus spp.)." Izvestiya TINRO 188, no. 1 (2017): 3–36. http://dx.doi.org/10.26428/1606-9919-2017-188-3-36.

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Some conceptions on marine ecology of pacific salmons (Oncorhynchus spp.), established in the second half of the last century, are discussed from critical position, as overemphasizing of the sea surface temperature influence on distribution of salmons and formation of their year-classes strength, deficiency of food (particularly in winter time) and fierce competition for food, pink salmon «suppression» over other salmon species and own adjacent generations, limited carrying capacity of the Subarctic zone for salmons, distortion of the epipelagic communities structure in the North Pacific by ma

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Zolotukhin, S. F. "BASIS FOR SELECTION OF RIVERS FOR MONITORING ON THE STOCKS OF CHUM AND PINK SALMON IN THE AMUR RIVER." Izvestiya TINRO 199 (December 3, 2019): 19–34. http://dx.doi.org/10.26428/1606-9919-2019-199-19-34.

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The monitoring of chum and pink salmon escapement to spawning grounds in the Amur River basin was stopped in 2009. To start it again, a proved choice of the rivers is necessary for adequate controlling of these species number, by the spawning habitats of their population groups within the basin. For this purpose, results of the monitoring in 1949–2000 and the data on human settlements in the medieval times are analyzed. The lower reaches of the Amur were anciently inhabited by the paleoasiatic Nivkh people and the upper reaches where the fall chum spawned in spring waters were inhabited by the

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9

Helland, IP, I. Uglem, PA Jansen, OH Diserud, PA Bjørn, and B. Finstad. "Statistical and ecological challenges of monitoring parasitic salmon lice infestations in wild salmonid fish stocks." Aquaculture Environment Interactions 7, no. 3 (2015): 267–80. http://dx.doi.org/10.3354/aei00155.

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10

Syrjänen, Jukka Tapani, Timo Juhani Ruokonen, Tarmo Ketola, and Pentti Valkeajärvi. "The relationship between stocking eggs in boreal spawning rivers and the abundance of brown trout parr." ICES Journal of Marine Science 72, no. 5 (2015): 1389–98. http://dx.doi.org/10.1093/icesjms/fsv017.

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Abstract Stocking with eggs has been widely used as a management measure to support degraded salmonid stocks. In Finland, Atlantic salmon and both sea-migrating and lake-migrating brown trout are stocked as eggs, alevins, fry, parr, and smolt, whereas trout are also stocked as mature fish. The aim of this stocking is to improve catches and to support collapsed spawning stocks. We assessed the success of stocking with brown trout eggs in a study of 17 Finnish boreal forest rivers, of which 9 were subject to egg stocking. All rivers contained some naturally spawning trout. In 16 rivers, includin

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Elliott, Lucas D., Hillary G. M. Ward, and Michael A. Russello. "Kokanee–sockeye salmon hybridization leads to intermediate morphology and resident life history: implications for fisheries management." Canadian Journal of Fisheries and Aquatic Sciences 77, no. 2 (2020): 355–64. http://dx.doi.org/10.1139/cjfas-2019-0034.

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Stocking programs designed to return extirpated species to their historical range have become increasingly prevalent, punctuating the need to better understand the risks posed to recipient ecosystems. Here, we investigated the genetic and biological consequences of an anadromous sockeye salmon (Oncorhynchus nerka) stocking program in Skaha Lake, British Columbia, where substantial levels of hybridization and introgression with the native freshwater resident ecotype (kokanee) have been detected. We genetically assigned 543 individuals (adult spawners, age-0 juveniles) to estimate stock proporti

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12

Prévost, Etienne, Eric Parent, Walter Crozier, et al. "Setting biological reference points for Atlantic salmon stocks: transfer of information from data-rich to sparse-data situations by Bayesian hierarchical modelling." ICES Journal of Marine Science 60, no. 6 (2003): 1177–93. http://dx.doi.org/10.1016/j.icesjms.2003.08.001.

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Abstract We present an application of Bayesian hierarchical modelling of stock–recruitment (SR) relationships aiming at estimating Biological Reference Points (BRP) for European Atlantic salmon (Salmo salar) stocks. The structure of the hierarchical SR model developed distinguishes two nested levels of randomness, within-river and between rivers. It is an extension of the classical Ricker model, where the parameters of the Ricker function are assumed to be different between rivers, but drawn from a common probability distribution conditionally on two covariates: river size and latitude. The ou

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13

Steel, Jade R., William I. Atlas, Natalie C. Ban, et al. "Understanding barriers, access, and management of marine mixed-stock fisheries in an era of reconciliation: Indigenous-led salmon monitoring in British Columbia." FACETS 6, no. 1 (2021): 592–613. http://dx.doi.org/10.1139/facets-2020-0080.

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Wild salmon are central to food security, cultural identity, and livelihoods of coastal Indigenous communities. Yet ongoing inequities in governance, declining fish populations, and mixed-stock ocean fisheries may pose challenges for equitable access between Indigenous fishers and other non-Indigenous fishers. We sought to understand current perceptions among Haíłzaqv (Heiltsuk) fishers towards salmon fisheries and their management. We conducted dockside surveys with both Haíłzaqv fishers and sport fishers, and in-depth interviews with Haíłzaqv fishers, community members, and natural resource

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14

Korman, J., and P. S. Higgins. "Utility of escapement time series data for monitoring the response of salmon populations to habitat alteration." Canadian Journal of Fisheries and Aquatic Sciences 54, no. 9 (1997): 2058–67. http://dx.doi.org/10.1139/f97-115.

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We provide a quantitative examination of the utility of escapement data for monitoring changes in salmonid populations caused by habitat alterations. We used Monte Carlo simulations to determine the precision, duration of monitoring, and the effect size required to achieve acceptable statistical inferences based on before-after (BA) and before-after-control-impact (BACI) comparisons. There was generally less than a 50% chance of detecting a population response unless the population change was large (more than a twofold increase) or the post-treatment monitoring period long (>10 years). Stat

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15

Steele, Craig A., Eric C. Anderson, Michael W. Ackerman, et al. "A validation of parentage-based tagging using hatchery steelhead in the Snake River basin." Canadian Journal of Fisheries and Aquatic Sciences 70, no. 7 (2013): 1046–54. http://dx.doi.org/10.1139/cjfas-2012-0451.

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Parentage-based tagging (PBT) is a promising alternative to traditional coded-wire tag (CWT) methodologies for monitoring and evaluating hatchery stocks. This approach involves the genotyping of hatchery broodstock and uses parentage assignments to identify the origin and brood year of their progeny. In this study we empirically confirmed that fewer than 100 single nucleotide polymorphisms (SNPs) were needed to accurately conduct PBT, we demonstrated that our selected panel of SNPs was comparable in accuracy to a panel of microsatellites, and we verified that stock assignments made with this p

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16

Stekol’Shchikova, Marina Yu. "Some results of monitoring for the pink salmon hatchery stocks from the Aniva Bay (Sakhalin Island)." Izvestiya TINRO 183, no. 4 (2015): 51–60. http://dx.doi.org/10.26428/1606-9919-2015-183-51-60.

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Several population parameters (length and dynamics of spawning run, size-sex composition, variability of morphological and physiological characteristics) are determined and indices of survival are calculated for the pink salmon hatchery stocks from the Aniva Bay of the 2008-2011 generations on the base of the cultured pink salmon differentiation by thermal marks on otoliths. The hatchery pink salmon begin their migration to the bay rivers in late July, together with the wild fish. Size-weight parameters of the fish and their variability are similar for the hatchery and wild stocks in this peri

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17

Niemelä, E., J. Erkinaro, M. Julkunen, and E. Hassinen. "Is juvenile salmon abundance related to subsequent and preceding catches? Perspectives from a long-term monitoring programme." ICES Journal of Marine Science 62, no. 8 (2005): 1617–29. http://dx.doi.org/10.1016/j.icesjms.2005.07.002.

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Abstract The abundance of wild Atlantic salmon in the River Teno system has been monitored since the 1970s by estimating salmon catches and juvenile salmon densities at permanent electrofishing sites. Analysis of the time-series has shown significant relationships between juvenile densities (0+ and 1+) and subsequent 1SW and 2SW catches. Corresponding significant relationships have been detected between 1SW and 2SW female salmon in the catches and subsequent fry and parr densities. Monitoring juvenile densities allows evaluation of spawning escapement 1 and 2 years earlier, confirming the stoc

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18

Deacy, William W., William B. Leacock, Lisa A. Eby, and Jack A. Stanford. "A time-lapse photography method for monitoring salmon (Oncorhynchus spp.) passage and abundance in streams." PeerJ 4 (June 14, 2016): e2120. http://dx.doi.org/10.7717/peerj.2120.

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Accurately estimating population sizes is often a critical component of fisheries research and management. Although there is a growing appreciation of the importance of small-scale salmon population dynamics to the stability of salmon stock-complexes, our understanding of these populations is constrained by a lack of efficient and cost-effective monitoring tools for streams. Weirs are expensive, labor intensive, and can disrupt natural fish movements. While conventional video systems avoid some of these shortcomings, they are expensive and require excessive amounts of labor to review footage f

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19

Arkoosh, M. R., L. Johnson, P. A. Rossignol, and T. K. Collier. "Predicting the impact of perturbations on salmon (Oncorhynchus spp.) communities: implications for monitoring." Canadian Journal of Fisheries and Aquatic Sciences 61, no. 7 (2004): 1166–75. http://dx.doi.org/10.1139/f04-068.

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Twenty-six salmon (Oncorhynchus spp.) stocks from the Pacific Northwest are listed as either threatened or endangered. A number of anthropogenic factors, likely including degradation of habitat by chemical contaminant exposure, have contributed to their decline. Techniques that can assess injury or judge the efficacy of regulatory actions on the recovery of this species are needed. We strive to understand why a population is changing by examining changes in their intrinsic birth rates, death rates, and (or) growth rates. However, salmon populations are influenced by other species in the commun

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Munsch, Stuart H., Correigh M. Greene, Rachel C. Johnson, et al. "Science for integrative management of a diadromous fish stock: interdependencies of fisheries, flow, and habitat restoration." Canadian Journal of Fisheries and Aquatic Sciences 77, no. 9 (2020): 1487–504. http://dx.doi.org/10.1139/cjfas-2020-0075.

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Fish face many anthropogenic stressors. Authorities in marine, estuarine, and freshwater realms often share interdependent fisheries management goals, but address singular stressors independently. Here, we present a case study suggesting that coordinating stressor relief across management realms may synergize conservation efforts, especially to actualize restoration benefits. Major efforts are underway to restore juvenile salmon habitat across California’s Central Valley landscape, but it is unclear how fisheries and flow management will influence juvenile salmon occupancy of restored sites. L

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21

Walters, Carl J., and Peter Cahoon. "Evidence of Decreasing Spatial Diversity in British Columbia Salmon Stocks." Canadian Journal of Fisheries and Aquatic Sciences 42, no. 5 (1985): 1033–37. http://dx.doi.org/10.1139/f85-128.

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Escapement records indicate a severe decline since 1950 in the number of streams contributing significantly to salmon production in southern British Columbia. To account for 90% of the escapement for chinook (Oncorhynchus tshawytscha), coho (O. kisutch), pink (O. gorbuscha), and chum (O. keta), one need examine only about half as many streams now as in 1950. The deterioration has been most pronounced for coho; only 40 of 350 south coast streams now account for 80% of the recorded escapement. The apparent changes are due partly to reduced monitoring effort rather than actual stock declines, but

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Walker, Alan M., Malcolm C. M. Beveridge, Walter Crozier, Niall Ó Maoiléidigh, and Nigel Milner. "Monitoring the incidence of escaped farmed Atlantic salmon, Salmo salar L., in rivers and fisheries of the United Kingdom and Ireland: current progress and recommendations for future programmes." ICES Journal of Marine Science 63, no. 7 (2006): 1201–10. http://dx.doi.org/10.1016/j.icesjms.2006.04.018.

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Abstract An inevitable consequence of the development of the Atlantic salmon, Salmo salar L., farming industry in coastal waters of the British Isles has been the loss of farmed salmon to the wild, their occurrence in inshore waters and rivers, and their appearance in coastal and freshwater fisheries. Monitoring programmes have been developed throughout the British Isles, variously using scientific sampling, catch records from coastal or freshwater fisheries or both, and scientific sampling of catches from in-river traps. We compare the results of these monitoring programmes with regional prod

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23

Bradford, Michael J., Josh Korman, and Paul S. Higgins. "Using confidence intervals to estimate the response of salmon populations (Oncorhynchus spp.) to experimental habitat alterations." Canadian Journal of Fisheries and Aquatic Sciences 62, no. 12 (2005): 2716–26. http://dx.doi.org/10.1139/f05-179.

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There is considerable uncertainty about the effectiveness of fish habitat restoration programs, and reliable monitoring programs are needed to evaluate them. Statistical power analysis based on traditional hypothesis tests are usually used for monitoring program design, but here we argue that effect size estimates and their associated confidence intervals are more informative because results can be compared with both the null hypothesis of no effect and effect sizes of interest, such as restoration goals. We used a stochastic simulation model to compare alternative monitoring strategies for a

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Kaev, Alexander M., and Lev A. Zhivotovsky. "New findings to discussion on local versus fluctuating stocks of pink salmon Oncorhynchus gorbuscha." Izvestiya TINRO 187, no. 4 (2016): 122–44. http://dx.doi.org/10.26428/1606-9919-2016-187-122-144.

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Some patterns in dynamics of catch and biological parameters of pink salmon Oncorhynchus gorbuscha returned to the southeastern coast of Sakhalin Island and the Aniva Bay in 2014 (additional peak in the return abundance and unusual increase in relative fecundity of females in the second half of the return) could be interpreted as presence of the fish from Kuril Islands. This hypothesis was proven by the scale structure analysis, using the known difference between the pink salmon from southern Sakhalin and Iturup Island by the total number of sclerites and the depth of the local minimum in the

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Wohlfarth, Giora W. "Decline in Natural Fisheries — A Genetic Analysis and Suggestion for Recovery." Canadian Journal of Fisheries and Aquatic Sciences 43, no. 6 (1986): 1298–306. http://dx.doi.org/10.1139/f86-162.

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Overfishing and pollution of the aquatic environment, in addition to their direct effects on natural fisheries, may have also influenced natural fish populations genetically. Overfishing drastically reduces population size and, since the larger individuals are selectively removed, is equivalent to selection for smaller sized fish. Adaptation of natural fish populations to their environment must have been reduced by rapid environmental changes resulting from pollution and infestation. Inbreeding, negative selection, and lack of adaption are here considered as the genetic causes for the decline

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Brooker, Adam J., Athina Papadopoulou, Carolina Gutierrez, Sonia Rey, Andrew Davie, and Herve Migaud. "Sustainable production and use of cleaner fish for the biological control of sea lice: recent advances and current challenges." Veterinary Record 183, no. 12 (2018): 383. http://dx.doi.org/10.1136/vr.104966.

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Currently, cleaner fish are one of the most widely used sea lice control strategies in Atlantic salmon aquaculture. Two species are currently being farmed in North Atlantic countries, ballan wrasse (Labrus bergylta) and lumpfish (Cyclopterus lumpus), and the sector in most countries is rapidly expanding towards self-sufficiency. The species are very different both in terms of their biology and life histories and, consequently, production and husbandry methods must be tailored to each species. There are numerous health challenges currently experienced in both species, with bacterial and parasit

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Fukuwaka, M., and ND Davis. "Responses of a pelagic fish community to reduced fishing pressure in the central Bering Sea." Marine Ecology Progress Series 673 (September 2, 2021): 183–92. http://dx.doi.org/10.3354/meps13800.

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Ecosystem-based fishery management (EBFM) requires minimizing the risk of irreversible change to a natural assemblage of species. Because pelagic fisheries modify the biotic community rather than the physical environment and often target migratory species, the pelagic community can be expected to respond quickly after fishing pressure is reduced. We monitored the pelagic zooplanktivore community over 4 decades in the central Bering Sea before and after the closures of large-scale pelagic fisheries. We found a quick and steep change in the pelagic fish community structure after fishing pressure

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Kinnison, Michael, Martin Unwin, Nelson Boustead, and Thomas Quinn. "Population-specific variation in body dimensions of adult chinook salmon (Oncorhynchus tshawytscha) from New Zealand and their source population, 90 years after introduction." Canadian Journal of Fisheries and Aquatic Sciences 55, no. 3 (1998): 554–63. http://dx.doi.org/10.1139/f97-303.

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Chinook salmon (Oncorhynchus tshawytscha) transplanted from the Sacramento River, California, U.S.A., to New Zealand in the 1900s colonized many South Island rivers, which now show significant population-specific phenotypic variation. To characterize this variation, we conducted a morphometric analysis of two New Zealand populations and the fall-run Battle Creek population at the Coleman Hatchery, the apparent ancestral stock. Variation in length at age, weight at length, fin lengths, hump depth, snout length, and caudal peduncle width was detected among populations. Sexually mature Battle Cre

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Grout, Douglas E. "Interactions between striped bass (Morone saxatilis) rebuilding programmes and the conservation of Atlantic salmon (Salmo salar) and other anadromous fish species in the USA." ICES Journal of Marine Science 63, no. 7 (2006): 1346–52. http://dx.doi.org/10.1016/j.icesjms.2006.03.021.

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Abstract Anadromous populations of striped bass occur along the Atlantic coast of the US from Maine to North Carolina. Recruitment overfishing and declining water quality led to substantial reductions in striped bass abundance during the 1970s and 1980s. Cooperative interstate fishery management of striped bass began in 1981, with the development of a fishery management plan by the Atlantic States Marine Fisheries Commission, an organization of Atlantic coastal states. Effective fishery management and additional research and monitoring contributed to a tenfold increase in abundance of striped

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Peters, Calvin N., and David R. Marmorek. "Application of decision analysis to evaluate recovery actions for threatened Snake River spring and summer chinook salmon (Oncorhynchus tshawytscha)." Canadian Journal of Fisheries and Aquatic Sciences 58, no. 12 (2001): 2431–46. http://dx.doi.org/10.1139/f01-173.

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There is uncertainty about the importance of various factors in explaining declines of chinook salmon (Oncorhynchus tshawytscha) populations in the Snake River basin of Oregon and Idaho. This uncertainty has prevented implementation of long-term recovery actions for these stocks. We used simulation models and decision analysis to evaluate three management actions for seven index stocks of Snake River spring and summer chinook salmon: (i) continue current operation of the Columbia River hydropower system, (ii) maximize transportation of smolts, and (iii) natural river drawdown (breaching) of fo

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Fängstam, Hasse. "Individual downstream swimming speed during the natural smolting period among young of Baltic salmon (Salmo salar)." Canadian Journal of Zoology 71, no. 9 (1993): 1782–86. http://dx.doi.org/10.1139/z93-253.

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The individual downstream swimming behaviour of two-summer-old salmon from the Ume River hatchery stock was monitored throughout the natural smolting period in May–June. The experiment was performed in an artificial-stream tank (diameter 11 m) equipped with a passive integrated transponder (PIT) tag monitoring system. The swimming speed of individual fish in relation to water velocity and the porportion of time during which an individual fish showed active versus passive displacement were investigated using a total of 224 sexually immature fish and previously mature males, individually PIT tag

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Peacock, Stephanie J., Eric Hertz, Carrie A. Holt, Brendan Connors, Cameron Freshwater, and Katrina Connors. "Evaluating the consequences of common assumptions in run reconstructions on Pacific salmon biological status assessments." Canadian Journal of Fisheries and Aquatic Sciences 77, no. 12 (2020): 1904–20. http://dx.doi.org/10.1139/cjfas-2019-0432.

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Information on biological status is essential for designing, implementing, and evaluating management strategies and recovery plans for threatened or exploited species. However, the data required to quantify status are often limited, and it is important to understand how assessments of status may be biased by assumptions in data analysis. For Pacific salmon, biological status assessments based on spawner abundances and spawner–recruitment (SR) analyses often involve “run reconstructions” that impute missing spawner data, expand observed spawner abundance to account for unmonitored streams, assi

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Hauksson, Erlingur, and Sólmundur T. Einarsson. "Review on utilization and research on harbour seal (Phoca vitulina) in Iceland." NAMMCO Scientific Publications 8 (September 1, 2010): 341. http://dx.doi.org/10.7557/3.2698.

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Harbour seals (Phoca vitulina) have been harvested in Iceland since the first settlers arrived in the 9th century. Pups were generally netted, clubbed and harpooned until 1875 when general use of guns for hunting began. Seal-hunting has been traditional amongst the farms legal rights. Seal hunting was an important supplement to other economic resources. Harbour seal skins, salted ordried, were exported and large dataset of catch statistics is available from trading logbooks since the late 19th century. In the early 20th century catch was about 6,000. In the ‘bounty’ period 1982 – 1989, maximum

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Vautier, Marine, Cécile Chardon, Chloé Goulon, Jean Guillard, and Isabelle Domaizon. "A quantitative eDNA-based method to monitor spawning activity of two emblematic fish species in lake Geneva." ARPHA Conference Abstracts 4 (March 4, 2021). http://dx.doi.org/10.3897/aca.4.e64796.

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Anthropogenic pressures and more recently climatic change have increased the interest to study the impact of environmental changes on the key stages of fish life cycle. In lake Geneva, a deep peri-alpine lake, climate change and phosphorous level are known to have consequences on salmonid and percid populations, including key species for recreational and commercial fisheries, whose stocks are subject to significant fluctuations. To follow these stock variations, the spawning activity of European perch (Perca fluviatilis) and whitefish (Coregonus lavaretus) is monitored in this lake since sever

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Lai, Tin-Yu, Marko Lindroos, Lone Grønbæk, and Atso Romakkaniemi. "The Role of Food Web Interactions in Multispecies Fisheries Management: Bio-economic Analysis of Salmon, Herring and Grey Seal in the Northern Baltic Sea." Environmental and Resource Economics, June 26, 2021. http://dx.doi.org/10.1007/s10640-021-00571-z.

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AbstractMultispecies bio-economic models are useful tools to give insights into ecosystem thinking and ecosystem-based management. This paper developed an age-structured multispecies bio-economic model that includes the food web relations of the grey seal, salmon, and herring, along with salmon and herring fisheries in the Baltic Sea. The results show that the increasing seal population influences salmon fisheries and stock, but the impacts on the harvest are stronger than on the stock if the targeted management policies are obeyed. If seal population growth and a low herring stock occur simul

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Lepe-López, Manuel, Joaquín Escobar-Dodero, Daniel Rubio, Julio Alvarez, Natalia Zimin-Veselkoff, and Fernando O. Mardones. "Epidemiological Factors Associated With Caligus rogercresseyi Infection, Abundance, and Spatial Distribution in Southern Chile." Frontiers in Veterinary Science 8 (August 20, 2021). http://dx.doi.org/10.3389/fvets.2021.595024.

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Sea lice (Caligus rogercresseyi) are external parasites that affect farmed salmonids in Chile, and the scale of their sanitary and economic impact cannot be overstated. Even though space–time patterns suppose parasite aggregation, specific locations related to different infestation levels, as well as their associated factors across the geographic range involved, had not been investigated as of the writing of the present article. The understanding of the effects and factors entailed by the presence of C. rogercresseyi may be deemed a key element of Integrated Pest Management (IPM). In the prese

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Pilger, Tyler, Matthew Peterson, Dana Lee, Andrea Fuller, and Doug Demko. "Evaluation of Long-Term Mark-Recapture Data for Estimating Abundance of Juvenile Fall-Run Chinook Salmon on the Stanislaus River from 1996 to 2017." San Francisco Estuary and Watershed Science 17, no. 1 (2019). http://dx.doi.org/10.15447/sfews.2019v17iss1art4.

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Conservation and management of culturally and economically important species rely on monitoring programs to provide accurate and robust estimates of population size. Rotary screw traps (RSTs) are often used to monitor populations of anadromous fish, including fall-run Chinook Salmon (Oncorhynchus tshawytscha) in California’s Central Valley. Abundance estimates from RST data depend on estimating a trap's efficiency via mark-recapture releases. Because efficiency estimates are highly variable and influenced by many factors, abundance estimates can be highly uncertain. An additional complication

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Schade, S., and T. Meier. "Techno-economic assessment of microalgae cultivation in a tubular photobioreactor for food in a humid continental climate." Clean Technologies and Environmental Policy, February 23, 2021. http://dx.doi.org/10.1007/s10098-021-02042-x.

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AbstractFish as the primary source for the essential n − 3 fatty acids eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) cannot cover the global demand for these important nutrients resulting in a supply gap of currently 1.1 million tons of EPA + DHA annually. A further exploitation of natural fish stocks is linked to great damage to ecosystems. Oleaginous microalgae are a natural source for EPA and DHA and could possibly contribute to closing this gap. The cultivation in photobioreactors (PBR) in a ‘cold-weather’ climate showed that microalgae compare favorably to aquaculture fish. T

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