Relationships between Water Mass Characteristics and Estimates of Fish Population Abundance from Trawl Surveys

1991 ◽  
pp. 149-167
Author(s):  
Stephen J. Smith ◽  
R. Ian Perry ◽  
L. Paul Fanning
Keyword(s):  
Water Mass ◽  
Fish Population ◽  
Population Abundance ◽  
Trawl Surveys

scholarly journals Estimating fish population abundance by integrating quantitative data on environmental DNA and hydrodynamic modelling

2018 ◽  
Author(s):  
Keiichi Fukaya ◽  
Hiroaki Murakami ◽  
Seokjin Yoon ◽  
Kenji Minami ◽  
Yutaka Osada ◽  
...  
Keyword(s):  
Environmental Dna ◽  
Cost Effective ◽  
Population Monitoring ◽  
Fish Population ◽  
Abundance Estimation ◽  
Population Abundance ◽  
Jack Mackerel ◽  
Non Invasive ◽  
Quantitative Measurements ◽  
Japanese Jack Mackerel

AbstractWe propose a general framework of abundance estimation based on spatially replicated quantitative measurements of environmental DNA in which production, transport, and degradation of DNA are explicitly accounted for. Application to a Japanese jack mackerel (Trachurus japonicus) population in Maizuru Bay revealed that the method gives an estimate of population abundance comparable to that of a quantitative echo sounder method. These findings indicate the ability of environmental DNA to reliably reflect population abundance of aquatic macroorganisms and may offer a new avenue for population monitoring based on the fast, cost-effective, and non-invasive sampling of genetic information.

Hierarchical model detects decadal changes in calibration relationships of single-pass electrofishing indices of abundance of Atlantic salmon in two large Canadian catchments

2019 ◽  
Vol 76 (4) ◽  
pp. 523-542 ◽  
Author(s):  
Guillaume J.R. Dauphin ◽  
Gérald Chaput ◽  
Cindy Breau ◽  
Richard A. Cunjak
Keyword(s):  
Atlantic Salmon ◽  
Fish Population ◽  
Sampling Procedure ◽  
Population Abundance ◽  
New Techniques ◽  
Single Pass ◽  
Sampling Protocols ◽  
Using Data ◽  
The Relationship ◽  
Index Of Abundance

Electrofishing is a commonly used technique to assess freshwater fish population abundance, and in many programs, there has been a shift in the sampling methodologies towards less laborious techniques. These new techniques usually only provide an index of abundance and require calibration with other sampling methods such as successive removal to be used for absolute abundance estimation. Using data for juvenile Atlantic salmon (Salmo salar) collected in 400 sites sampled over 21 years in two large Canadian river catchments with a single sampling protocol, we developed a hierarchical Bayesian model to account for effort, day of sampling, area of the site, and catchment effects on the relationship between the single-pass index of abundance and the fish densities, thereby illustrating the importance of carrying out a calibration exercise on a regular basis. Our work indicates that calibration relationships can change over time even with standardized sampling protocols and that these directional changes in important components of the sampling procedure can bias the estimate of population abundance and misinform the understanding of population dynamics.

Application of a Multispecies Approach for Assessing the Population Abundance and the Age–Structure of Fish Stocks

1981 ◽  
Vol 38 (4) ◽  
pp. 424-431 ◽  
Author(s):  
Jacek Majkowski
Keyword(s):  
Fish Species ◽  
Age Structure ◽  
Cohort Analysis ◽  
Laboratory Data ◽  
Single Species ◽  
Fish Predation ◽  
Fish Population ◽  
Natural Mortality ◽  
Population Abundance ◽  
Fish Stocks

Application of a multispecies approach for assessing the population abundance and the age-structure of fish stocks is proposed. The main objective of this approach is to eliminate a bias in the results of cohort analysis (the most frequently used single-species procedure for assessing the fish population age-structure) caused by uncertainties in the external estimates of natural mortality rates. The approach is applicable if fish predation is a major cause for fish natural mortality and all fish species which significantly interact among themselves through predation are taken into account. It is additionally assumed that these fish species do not leave the area under consideration. Compliance with these conditions allows the prediction, on the basis of ecological theory and required field and laboratory data, of a major component of natural mortality, predation mortality, within extended cohort analysis. The paper describes the proposed procedure (extended cohort analysis) and outlines possible ways of collecting the required input data.Key words: assessment, fish population abundance, age-structure, multispecies approach, natural and fishing mortality

scholarly journals Application of eDNA as a tool for assessing fish population abundance

2020 ◽  
Author(s):  
Michael J. Spear ◽  
Holly S. Embke ◽  
Patrick J. Krysan ◽  
M. Jake Vander Zanden
Keyword(s):  
Fish Population ◽  
Population Abundance

scholarly journals Estimating fish population abundance by integrating quantitative data on environmental DNA and hydrodynamic modelling

2020 ◽  
Author(s):  
Keiichi Fukaya ◽  
Hiroaki Murakami ◽  
Seokjin Yoon ◽  
Kenji Minami ◽  
Yutaka Osada ◽  
...  
Keyword(s):  
Quantitative Data ◽  
Environmental Dna ◽  
Fish Population ◽  
Hydrodynamic Modelling ◽  
Population Abundance

Ultrastructure of Some Planktonic Formainifera

1974 ◽  
Vol 32 ◽  
pp. 190-191
Author(s):  
William H. Zucker
Keyword(s):  
Cell Biology ◽  
Water Mass ◽  
Planktonic Foraminifera ◽  
Uranyl Acetate ◽  
Ethanol Dehydration ◽  
Globigerinoides Ruber ◽  
Light Microscope Level ◽  
Globigerina Bulloides ◽  
Glutaraldehyde Solution ◽  
Diamond Knife

Planktonic foraminifera are widely-distributed and abundant zooplankters. They are significant as water mass indicators and provide evidence of paleotemperatures and events which occurred during Pleistocene glaciation. In spite of their ecological and paleological significance, little is known of their cell biology. There are few cytological studies of these organisms at the light microscope level and some recent reports of their ultrastructure.Specimens of Globigerinoides ruber, Globigerina bulloides, Globigerinoides conglobatus and Globigerinita glutinata were collected in Bermuda waters and fixed in a cold cacodylate-buffered 6% glutaraldehyde solution for two hours. They were then rinsed, post-fixed in Palade's fluid, rinsed again and stained with uranyl acetate. This was followed by graded ethanol dehydration, during which they were identified and picked clean of debris. The specimens were finally embedded in Epon 812 by placing each organism in a separate BEEM capsule. After sectioning with a diamond knife, stained sections were viewed in a Philips 200 electron microscope.

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