A5078994883- Fish Ecology and Management Studies
- Fish Biology and Ecology Studies
- Marine and fisheries research
- Water Quality and Resources Studies
- Fish biology, ecology, and behavior
- Aquatic Invertebrate Ecology and Behavior
- Reproductive biology and impacts on aquatic species
- Aquatic Ecosystems and Phytoplankton Dynamics
- Aquaculture Nutrition and Growth
- Hydrology and Sediment Transport Processes
- Archaeology and Natural History
- Genetic diversity and population structure
- Freshwater macroinvertebrate diversity and ecology
- Census and Population Estimation
- Toxic Organic Pollutants Impact
- Species Distribution and Climate Change
- Identification and Quantification in Food
- Genetic and phenotypic traits in livestock
- Wildlife Ecology and Conservation
- Hydrology and Watershed Management Studies
- Mercury impact and mitigation studies
- Environmental Toxicology and Ecotoxicology
- Water Quality and Pollution Assessment
United States Fish and Wildlife Service
2014-2023
Iowa State University
2007-2010
Abstract We examined fish populations, limnological conditions, lake basin morphology and watershed characteristics to evaluate patterns in population of ecologically important species relation environmental conditions agriculturally eutrophic systems. Fish populations were sampled from 129 Iowa lakes using standard techniques 2001–2006. Lakes with high catch rates common carp (Cyprinus carpio) had nutrient concentrations, phytoplankton biomass low water transparency. In addition, sport...
Abstract Standard methods for comparing population characteristics within and among fish populations greatly enhance communications fisheries scientists, improve the efficiency of data analysis, provide insight that helps guide management actions. Although standard are available some (e.g. length structure, body condition), similar lacking growth. The purpose this study was to standards (i.e. percentiles a growth model) nine ecologically recreationally important species. Percentile...
Abstract Understanding the population dynamics of native and nonnative fishes is critical for guiding evaluating management activities, but obtaining information on often dependent identifying structures that provide precise estimates age. We examined age estimation using various hard bluehead suckers Catostomus discobolus , flannelmouth C. latipinnis roundtail chub Gila robusta white commersonii creek Semotilus atromaculatus sucker × hybrids, hybrids in a small headwater stream upper...
Introduction The Sacramento-San Joaquin River system (SSJ) of California includes both riverine, delta, and estuarine habitats is among the most modified aquatic ecosystems in United States. Water development projects are associated with declines many native species, including White Sturgeon Acipenser transmontanus . Methods We used pectoral fin rays collected from 1983 to 2016 throughout SSJ assess long-term changes growth associations thermal hydrological conditions (i.e., temperature,...
Abstract Common carp Cyprinus carpio occurs in several non‐native areas worldwide, where it is generally regarded as either naturalised or invasive. Anatolia (Turkey) represents a unique region for evaluating common growth, due both to its location at the southernmost range of expansion species' wild form and most water bodies having been stocked with domesticated strains. Based on review length‐at‐age data stocks from 45 sampled between 1953 2007, regional patterns growth across climates,...
The goal of a day-long symposium on March 3, 2015, Sturgeon in the Sacramento–San Joaquin Watershed: New Insights to Support Conservation and Management, was present new information about physiology, behavior, ecology green (Acipenser medirostris) white sturgeon transmontanus) help guide enhanced management conservation efforts within watershed. This identified current unknowns highlighted electronic tracking technologies physiological techniques address these knowledge gaps. A number...
Abstract The objective of this study was to validate the use fin ray strontium isotope ratios ( 87 Sr: 86 Sr) via laser ablation (LA) resolve fine‐scale movement patterns in sturgeons (Acipenseridae) during freshwater rearing early life stages. We conducted a laboratory experiment which juvenile White Sturgeon Acipenser transmontanus were exposed two water sources exhibiting distinctive Sr values (American River and Putah Creek, California) over weekly time periods understand how exposure...
Effects of two fin‐ray sampling methods on swimming performance, growth and survival were evaluated for hatchery‐reared sub‐adult white sturgeon Acipenser transmontanus . Fish subjected to either a notch removal treatment in which small section was removed from an anterior marginal pectoral‐fin ray, or full entire ray removed. Control fish did not have fin rays removed, but they sham operation. A modified 3230 l Brett‐type swim tunnel used evaluate 10 min critical station‐holding speeds ( S...
Abstract Inadequate recruitment is a hallmark of declining sturgeon populations throughout the world. Efforts to understand and address processes that regulate are foremost importance for successful management recovery. Fish biologists previously only knew San Francisco Estuary white (Acipenser transmontanus) spawn in Sacramento River, California. We assessed potential spawning locations by deploying artificial substrate samplers during late winter spring 2011 2012 from river kilometers...
ABSTRACT We examined precision in age estimates from common carp (Cyprinus carpio) scales and dorsal spines sampled 28 Iowa lakes (N = 501 individual fish). Exact agreement between two readers was 28.5% for 90.6% spines. Agreement of scale ages poor across the distribution assigned ages. spine increased to 95.8% after a joint examination conducted assess reasons disagreements. Age were as much eight years less seven greater than estimated spines, discrepancies occurred young well old fish.
Abstract Exotic species have been implicated as a major threat to native freshwater fish communities in the Unites States. The San Francisco Estuary watershed has recognized one of most invaded systems where exotics often dominate community. On October 6, 2014, members U.S. Fish and Wildlife Service detected previously unknown exotic disconnected pool immediately upstream from Chowchilla Bifurcation Structure Joaquin River, tributary Estuary. A member initially identified an Oriental...
Abstract Objective The Southwest has the hottest and driest climate in United States, projections show that it will only get hotter drier into 2100s. Apache Trout Oncorhynchus apache is native to currently listed as threatened under U.S. Endangered Species Act. Our goals were understand how factors influence distribution of juvenile (<125 mm TL) change suitability habitat 2080s. Methods We used a species model evaluate climatic other Trout. predictions from might impact streams designated...
Abstract Recent surveys suggest a declining population of White Sturgeon Acipenser transmontanus in the Sacramento–San Joaquin River basin ( SSJ ), California. Probable reasons for decline include overharvest and habitat degradation compounded by poor recruitment during recent droughts. Despite importance status Sturgeon, knowledge their dynamics remains incomplete additional information is needed to further inform management decisions. The purpose this study was evaluate use estimate...
Abstract The goal for using genetic information derived from embryo samples is to gain insight into the reproductive biology of adult white sturgeon, Acipenser transmontanus Richardson. relationship between egg development stages on extraction quality DNA was determined, and subsequent genotype data were used infer contributing spawner numbers. White sturgeon present in extractions all stages; however, pre‐gastrulation stage embryos generally failed amplify sufficient loci analysis. Using...
Abstract Stream length is measured for many fisheries management applications. Characteristics of populations and habitats at field sites are commonly generalized to unsampled areas using estimates stream or network length. There ways measure length, but map‐based measurements used in applications even though they known be biased. We evaluated how headwater streams Arizona may underestimated by the National Hydrography Dataset that bias influences streamwide abundance adult Apache Trout...
Abstract Management objectives for long-lived species are difficult to define because many taxa have delayed maturity and variable recruitment. White Sturgeon Acipenser transmontanus is an example of a with complex life history that complicates long-term status monitoring establishment management objectives. Historically, in the Sacramento–San Joaquin River basin been monitored by tracking abundance age-15 individuals as outlined Central Valley Project Improvement Act. However, infrequent...
Abstract Bigscale Logperch Percina macrolepida is reported and substantiated for the first time in Arizona. A single specimen was collected during a routine survey of Cow Springs Lake on September 26, 2017, preliminarily identified as sp., preserved, retained species identification. We verified through genetic analysis. Review published literature U.S. Geological Survey Nonindigenous Aquatic Species Database suggests that this known occurrence Further, three additional nonnative were...
Abstract Obtaining reliable information on the age structure of fish populations is important for making conservation and management decisions. We sought to evaluate precision reader confidence in estimates from scales (two body locations), sectioned fin rays (pectoral, pelvic, anal), sagittal otoliths Apache Trout Oncorhynchus apache (n = 78 fish) sampled East Fork White River, Arizona, 2017. Two experienced readers without prior knowledge length aged structures independently. Each provided...