Temporal Trends of Channel Catfish Population Characteristics in the Missouri River, Nebraska

2016 ◽  
Vol 176 (1) ◽  
pp. 106-118
Author(s):  
B. L. Eder ◽  
G. E. Mestl ◽  
M. A. Pegg
Keyword(s):  
Channel Catfish ◽  
Temporal Trends ◽  
Missouri River ◽  
Population Characteristics

scholarly journals Systematic review of temporal trends of congenital syphilis in Brazil

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Maicon Madureira ◽  
Paulo Henrique de Araújo Guerra ◽  
Charles Junior Finco ◽  
Thais Nascimento Helou ◽  
Paulo Roberto Barbato
Keyword(s):  
Systematic Review ◽  
Low Income ◽  
Congenital Syphilis ◽  
Temporal Trends ◽  
Population Characteristics ◽  
Inclusion Criteria ◽  
Unified Health System ◽  
Black Skin ◽  
Low Education ◽  
Ethnic Factors

The present study was aimed to retrieve and analyse the temporal trends of congenital syphilis (CS) in Brazil, as well as to list its main associated factors. Methods: In August 2019 a systematic review was developed in four electronic databases (Lilacs, Pubmed, Scielo and Web of Science) and in manual searches on reference lists. It was established that the synthesis of this review would be composed by ecological studies with CS temporal trends in the Brazilian territory, regardless of the population characteristics and data representativeness. More specifically, it was also established that the prevalence of CS of the first and last year of the time series would be presented in the descriptive synthesis. Results: Of the 2,157 initial studies, 14 adequately met the inclusion criteria and composed the synthesis. Twelve (85.7%) of these studies showed increases in time trends, with particular emphasis on the two nationwide studies, which showed positive trends between 2003–2008 (0.4) and 2010–2015 (3.7). Associations were found between CS and socioeconomic and ethnic factors, especially in the groups of women with low income, low education, brown / black skin colour and who had untreated partners. Conclusion: most of the available research showed an increase in the temporal trends of CS, highlighting that these data were observed at the national, state and municipal levels. Since mothers socioeconomic and ethnic factors are associated with higher CS frequencies, efforts are needed to increase the coverage of the Unified Health System to vulnerable women.

Conservation, Ecology, and Management of Catfish: The Second International Symposium

2011 ◽  
Keyword(s):  
Ictalurus Punctatus ◽  
Channel Catfish ◽  
Management Strategies ◽  
Missouri River ◽  
The United States ◽  
Common Species ◽  
Main Stem ◽  
Commercial Fishing ◽  
Commercial Species ◽  
Fish Harvest

Abstract.—Channel catfish <em>Ictalurus punctatus</em> are an important recreational and commercial species in much of the United States. Catfish species accounted for a large portion of angler harvest in the years prior to, and immediately after, main-stem reservoir construction on the Missouri River. Since impoundment, fish communities and angler preferences have shifted. Although channel catfish have remained abundant and are among the most common species in population surveys, they are no longer heavily targeted by anglers. We compared channel catfish population metrics, management, and angler creel surveys among the six main-stem Missouri River reservoirs in order to better understand and promote these fisheries. Proportional size distributions ranged from 35 to 79, and relative weights ranged from 84 to 93 among reservoirs in 2009. Channel catfish mean lengths at age were highest in Gavins Point, the lowermost reservoir, and tended to decrease upstream. Estimates of total annual mortality from catch-curve analysis ranged from 12% to 25%. Several reservoirs had a channel catfish population consisting of fish with all year-classes present through age 20, suggesting low exploitation, and one channel catfish from Garrison Reservoir was estimated to be age 28. Gavins Point and Fort Peck are the only reservoirs regulated with harvest limits and bans on commercial fishing. Percentage of interviewed anglers specifically targeting channel catfish ranged from less than 1.0% to 9.5% among reservoirs, and catfish accounted for less than 3.0% of overall estimated fish harvest for all reservoirs combined. These reservoirs could support significant increases in channel catfish harvest. Additional research and creative management strategies are needed to better promote these underutilized fisheries.

scholarly journals Increasing socioeconomic gap between the young and old: temporal trends in health and overall deprivation in England by age, sex, urbanity and ethnicity, 2004–2015

2018 ◽  
Vol 72 (7) ◽  
pp. 636-644 ◽  
Author(s):  
Evangelos Kontopantelis ◽  
Mamas A Mamas ◽  
Harm van Marwijk ◽  
Iain Buchan ◽  
Andrew M Ryan ◽  
...  
Keyword(s):  
Relative Deprivation ◽  
Important Determinant ◽  
Temporal Trends ◽  
Population Characteristics ◽  
Government Policies ◽  
Real Wages ◽  
Regional Variability ◽  
Cross Sectional ◽  
Index Of Multiple Deprivation ◽  
Over Time

BackgroundAt a low geographical level, little is known about the associations between population characteristics and deprivation, and their trends, which would be directly affected by the house market, labour pressures and government policies. We describe temporal trends in health and overall deprivation in England by age, sex, urbanity and ethnicity.MethodsRepeated cross-sectional whole population study for England, 2004–2015, at a low geographical level (average 1500 residents). We calculated weighted medians of the Index of Multiple Deprivation (IMD) for each subgroup of interest.ResultsOver time, we observed increases in relative deprivation for people aged under 30, and aged 30–59, while median deprivation decreased for those aged 60 or over. Subgroup analyses indicated that relative overall deprivation was consistently higher for young adults (aged 20–29) and infants (aged 0–4), with increases in deprivation for the latter. Levels of overall deprivation in 2004 greatly varied by ethnicity, with the lowest levels observed for White British and the highest for Blacks. Over time, small reductions were observed in the deprivation gap between White British and all other ethnic groups. Findings were consistent across overall IMD and its health and disability subdomain, but large regional variability was also observed.ConclusionsGovernment policies, the financial crisis of 2008, education funding and the increasing cost of houses relative to real wages are important parameters in interpreting our findings. Socioeconomic deprivation is an important determinant of health and the inequalities this work highlights may have significant implications for future fiscal and healthcare policy.

Burbot: Ecology, Management, and Culture

2008 ◽  
Keyword(s):  
Relative Abundance ◽  
Inverse Relationship ◽  
Relative Weight ◽  
Cumulative Effect ◽  
Missouri River ◽  
Population Characteristics ◽  
Sampling Efficiency ◽  
Temperature Regimen ◽  
Catch Rates ◽  
Central Montana

<em>Abstract.</em>—Although burbot <em>Lota lota </em>are native to Montana, little is known about their distribution, life history, and ecology. The objectives of this study were to determine the distribution, relative abundance, and population characteristics of burbot in the upper Missouri River basin in north-central Montana, and to compare sampling efficiency of hoop nets, cod traps, and slat traps. Hoop nets and cod traps were fished in the Missouri River during March 2005 and 2006, and slat traps were fished during March 2006. In total, hoop nets were fished 572 net nights, cod traps for 94 net nights, and slat traps for 92 net nights. Catch rates of hoop nets and cod traps were higher in 2005 than in 2006, and catch rates of all gear types were higher in the upstream half of the study area. Mean section-wide hoop-net catch rates exhibited a significant (<EM>P </EM>≤0.05) inverse relationship with increasing distance downstream from Holter Dam, while catch rates for other gear types did not. Catch rates were not significantly different (<EM>P </EM>≥0.05) among gear types. The size (length and weight) and condition (relative weight) of burbot sampled was significantly (<EM>P </EM>≤0.05) different among gear types. Length, weight, and relative weight were higher for burbot sampled in hoop nets and cod traps than those sampled in slat traps. Slat traps were effective at sampling small (≤300 mm) burbot. Although most (80%) burbot were recaptured within 10 km of where they were tagged, three burbot moved more than 33 km. We hypothesize that the distribution of burbot in our study reach has changed and relative abundance has increased due to the cumulative effect of upstream reservoirs (Canyon Ferry, Hauser, and Holter) by decreasing the downstream water temperature regimen.

scholarly journals Growth and Mortality of Invasive Flathead Catfish in the Tidal James River, Virginia

2019 ◽  
Vol 10 (2) ◽  
pp. 641-652
Author(s):  
Corbin D. Hilling ◽  
Aaron J. Bunch ◽  
Jason A. Emmel ◽  
Joseph D. Schmitt ◽  
Donald J. Orth
Keyword(s):  
United States ◽  
Native Species ◽  
Temporal Trends ◽  
The United States ◽  
Population Characteristics ◽  
Older Individuals ◽  
Apex Predators ◽  
James River ◽  
Flathead Catfish ◽  
1960S And 1970S

Invasive species are a major threat to biodiversity of native fishes in North America. In Atlantic coastal rivers of the United States, large catfishes introduced from the Gulf of Mexico drainages have become established and contributed to native species declines. Flathead Catfish Pylodictis olivaris were introduced to the Chesapeake Bay drainage in the 1960s and 1970s in the James and Potomac river systems in the eastern United States. Diet studies have found James River Flathead Catfish function as apex predators and are known to consume at-risk Alosa spp. To limit further range expansion and impacts to native species, resource management agencies need information on population characteristics to support population assessments and management plan development. Thus, we examined temporal trends in growth rates and estimated total instantaneous mortality for tidal James River Flathead Catfish collected by Virginia Department of Game and Inland Fisheries from 1997 to 2015. Parameters of the von Bertalanffy growth model with length-at-age observations pooled across sampling years were estimated as L∞ = 1,059 mm, k = 0.231/y, and t0 = 0.55 y. Flathead Catfish growth differed among sampling years, especially for the years 2007 and 2014, which had the largest sample sizes. However, there were no obvious temporal trends in growth trajectories. James River Flathead Catfish tend to grow much faster than most populations used in development of the relative growth index, but the species is known to grow faster in its nonnative range. Consequently, scientists and managers should use caution when applying growth indices if native and nonnative populations are not expressly considered in development of the index. We estimated total instantaneous mortality as Z = 0.50 and mean natural mortality from six estimators as M = 0.30. A lack of older individuals in the population means that mortality rates may be overestimated as a result of gear selectivity or ongoing maturation of the population. These data provide information to support future work examining the species in the James River and development of population models to evaluate management strategies and management plans.

scholarly journals Long-Term Data Suggest Potential Interactions of Introduced Walleye and Smallmouth Bass on Native Sauger in Four Missouri River Impoundments

2019 ◽  
Vol 10 (2) ◽  
pp. 602-618
Author(s):  
Mark J. Fincel ◽  
Nicholas B. Kludt ◽  
Hilary A. Meyer ◽  
Michael Weber ◽  
Christopher M. Longhenry
Keyword(s):  
Temporal Trends ◽  
Missouri River ◽  
Smallmouth Bass ◽  
Micropterus Dolomieu ◽  
Abundance Trends ◽  
Lewis And Clark ◽  
Potential Interactions ◽  
River Reservoirs ◽  
Term Data

Abstract Sauger Sander canadensis, Walleye Sander vitreus, and Smallmouth Bass Micropterus dolomieu, are important sportfish in the four main stem Missouri River reservoirs in South Dakota: Lakes Oahe, Sharpe, Francis Case, and Lewis and Clark. However, native Sauger populations, once assumed to be stable, may be in decline. To identify temporal trends and potential interspecific mechanisms affecting Sauger populations, we examined their long-term abundance trends in standard gillnet surveys and angler catch and harvest trends in long-term creel surveys. We also used a robust design occupancy model to examine changes in within-lake distribution of this species. There are concerns regarding the effects of Walleye and Smallmouth Bass on Sauger, so we also described the population trends of these potential competitors. Standard gillnet surveys indicated declining abundance of both Sauger and Walleye in Lakes Oahe and Sharpe. Sauger abundance has trended down in Lewis and Clark, but upward in Francis Case. Conversely, Walleye abundance trends declined in Francis Case and increased in Lewis and Clark. Occupancy (ψ̂) of Sauger declined in all four reservoirs, indicating a contracting distribution throughout the reservoirs. Walleye occupancy remained ∼1.0. Smallmouth Bass occupancy increased in the three reservoirs with sufficient data for analysis, excluding Lewis and Clark Lake. Smallmouth Bass exhibited steady increases in angler catch and harvest, as well as abundance in long-term gillnet surveys, suggesting expanding and increasing populations. Habitat alteration is hypothesized to be a major driver of the Sauger occupancy and abundance declines. However, Walleye and Smallmouth Bass interactions could also be contributing to observed declines of native Sauger.

Sign in / Sign up

Export Citation Format

Share Document