scholarly journals Patchiness of longitudinal fish distributions in a river as revealed by a continuous hydroacoustic survey

1996 ◽  
Vol 53 (2) ◽  
pp. 161-165 ◽  
Author(s):  
A Duncan
Keyword(s):  
Hydroacoustic Survey ◽  
Fish Distributions

Comparison of vertical mobile hydroacoustic survey strategies for monitoring fish distributions in the Gironde estuary (France)

2013 ◽  
Vol 134 ◽  
pp. 174-180 ◽  
Author(s):  
V. Samedy ◽  
E. Josse ◽  
J. Guillard ◽  
M. Pierre ◽  
M. Girardin ◽  
...  
Keyword(s):  
Gironde Estuary ◽  
Hydroacoustic Survey ◽  
Fish Distributions

Hudson River Fishes and their Environment

2006 ◽  
Keyword(s):  
Striped Bass ◽  
Muscle Power ◽  
White Perch ◽  
Hudson River ◽  
Key Species ◽  
Temperate Fish ◽  
Bay Anchovy ◽  
Hydroacoustic Survey ◽  
Fish Distributions ◽  
River Fish

<em>Abstract.</em>—Low water temperatures experienced by temperate fish during winter reduce muscle power, resulting in an important limitation to overwintering fishes that may explain why they often seek areas of reduced flow as winter refugia. The Hudson River is a heavily urbanized estuary, and as such, navigation and industrial influences may have particular importance to species seeking to overwinter there. In December 1995 and 1997, we used a mobile hydroacoustic survey, coupled with gill netting and midwater trawling for species identification, to identify the distribution and abundance of key species in the Hudson River. Striped bass <em>Morone saxatilis</em>, white perch <em>M. americana</em>, and bay anchovy <em>Anchoa mitchilli, </em>co-occurred in the lower 25 km of the river. Fish distributions were related to salinity. Striped bass and bay anchovy were found in highest densities in the lower river (Yonkers and Battery regions) and higher salinities. White perch dominated from Yonkers upriver. Acoustic population estimates of striped bass abundance from 1995 (576,110) compared favorably with a wintertime tagging study (949,000), but were grossly underestimated in 1997. Higher salinity in the Battery and Yonkers regions in 1997 may have pushed distributions of striped bass and white perch upriver compared to 1995 sampling and may have led to decreased precision in estimates. This study suggests that key Hudson River fish use much of the lower 61 km of the Hudson River as overwintering habitat.

Predicting freshwater fish distributions using landscape-level variables

2003 ◽  
Vol 60 (1) ◽  
pp. 17-32 ◽  
Author(s):  
David G Argent ◽  
Joseph A Bishop ◽  
Jay R Stauffer ◽  
Robert F Carline ◽  
Wayne L Myers
Keyword(s):  
Freshwater Fish ◽  
Landscape Level ◽  
Fish Distributions

The community structure of larval fish populations in an area of the Celtic Sea in 1998

2002 ◽  
Vol 82 (4) ◽  
pp. 641-648 ◽  
Author(s):  
S. Acevedo ◽  
O. Dwane ◽  
J.M. Fives
Keyword(s):  
Community Structure ◽  
Fish Species ◽  
Larval Fish ◽  
Single Species ◽  
Coastal Fish ◽  
Larval Stages ◽  
Celtic Sea ◽  
Sea Area ◽  
Insight Into ◽  
Fish Distributions

Ichthyoplankton from an area in the Celtic Sea was studied to provide an insight into the fish larval community structure in March, May and June 1998. Three station groups were defined each month, Neritic, Transition and Oceanic. The Neritic assemblages included larval stages of coastal fish species and the Oceanic assemblages included mesopelagic and high-oceanic fish species which were not recorded from any of the Neritic stations. The Transition stations usually contained species characteristic of both the Neritic and Oceanic assemblages. It is suggested that these broad patterns of larval fish distributions are constant features of the Celtic Sea area, probably related to the spawning location of the adults. The area is, in general, species poor, with the Oceanic stations usually dominated by a single species, indicating the presence of a large spawning school of fish.

Strong links between metal contamination, habitat modification and estuarine larval fish distributions

2011 ◽  
Vol 159 (6) ◽  
pp. 1499-1509 ◽  
Author(s):  
Andrew C. McKinley ◽  
Anthony Miskiewicz ◽  
Matthew D. Taylor ◽  
Emma L. Johnston
Keyword(s):  
Metal Contamination ◽  
Larval Fish ◽  
Habitat Modification ◽  
Fish Distributions

Research on Accuracy of a Boat Position Determination Using GNSS Techniques in Kinematic Mode

2017 ◽  
Author(s):  
Zbigniew Siejka
Keyword(s):  
Research Work ◽  
Precise Determination ◽  
Global Navigation Satellite Systems ◽  
Floating Platform ◽  
Satellite Systems ◽  
Depth Measurement ◽  
Satellite Positioning ◽  
Global Navigation Satellite ◽  
Hydroacoustic Survey

The main aim of this work is research on the use of satellite positioning GNSS – RTK / RTN techniques to estimate the trajectory of a hydrographic boat. Modern hydrographic boat is the carrier of advanced bathymetry system, integral with GNSS positioning techniques. The key elements of the correct execution of the hydroacoustic survey are two elements: the height of the water surface and precise determination of the position in the moment of performing depth measurement. Integrated Bathymetric System (ZSB) is installed on a floating platform which is in constant motion. To obtain correct results of the hydroacoustic survey, it is necessary to know the precise (3D) position of the platform. In this paper the author presented his own research on the precise determination of accurate and reliable trajectory of a boat. The proposed method uses Real Time Kinematic (RTK) techniques of satellite positioning GNSS (Global Navigation Satellite Systems). The article presents examples of the results obtained during the research work at the largest Polish river.

Advances in Understanding Landscape Influences on Freshwater Habitats and Biological Assemblages

2019 ◽  
Keyword(s):  
Human Population ◽  
Open Space ◽  
Fish Assemblages ◽  
Multiple Scales ◽  
Model Performance ◽  
Catchment Scale ◽  
Road Density ◽  
Animal Feeding Operations ◽  
Freshwater Habitats ◽  
Fish Distributions

<i>Abstract.</i>—Scale influences the detection of relationships between landscape alterations and stream fishes and therefore has strong implications for conservation planning and implementation. This is especially true in riverscapes because terrestrial landscapes drain into riverscapes in a manner that can be measured at multiple scales. Two commonly employed scales in riverscape ecology and conservation include local catchment (i.e., the area of land draining directly into a segment of stream between two confluences) and network catchment (i.e., the total area of upstream land). We used a multispecies extension of species distribution modeling (i.e., gradient forest) to describe relationships between landscape alterations (measured at local catchment and network catchment scales) and stream fish occurrence patterns in portions of the Mississippi and Tennessee River basins in western Tennessee, USA. Landscape alterations included seven urban or agricultural classes, and densities of roads, road crossings, dams, human population, mines, and confined animal feeding operations. At the network catchment scale, the most influential landscape alterations affecting fish distributions were cultivated crops and pasture/hay land uses, but at the local catchment scale, open-space development, human population density, and road density were most important for describing multispecies fish distributions. Despite these differences, gradient forest model performance measured as explained variation at the species level was consistent between local catchment and network catchment scales. Furthermore, when predictions for unsampled stream segments were mapped across the region, both scales produced consistent patterns in fish assemblages affected by low, medium, and high development or cultivated crops. Our results provide direction to conservation practitioners by identifying regions where limited resources might be allocated to increase efficiencies within two highly altered and taxonomically diverse riverscapes. The framework described here provides a case study for application of new statistical innovations to address conservation challenges and can be used in other landscapes and riverscapes to identify locations where management efforts might be best allocated.

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