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eLibrary > BS EN 15910:2014 Water quality. Guidance on the estimation of fish abundance with mobile hydroacoustic methods >

BS EN 15910:2014 Water quality. Guidance on the estimation of fish abundance with mobile hydroacoustic methods, 2014

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BS EN 15910:2014 Water quality. Guidance on the estimation of fish abundance with mobile hydroacoustic methods, 2014

Contents Page
Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions, symbols and abbreviated terms [Go to Page]
3.1 Terms and definitions
3.2 Symbols and abbreviated terms
4 Principle and field of application
Table 1 — Suitability of hydroacoustic sampling techniques for inland water bodies and fish communities
5 Equipment [Go to Page]
5.1 General
5.2 System performance [Go to Page]
5.2.1 Minimum requirements
5.2.2 Optimum requirements
5.3 Calibration [Go to Page]
5.3.1 General
5.3.2 Types of calibration [Go to Page]
5.3.2.1 Full instrument and equipment calibration
5.3.2.2 Beam pattern calibration
5.3.2.3 Standard Target tests
Table 2 — Example values for target strengths (TS) of tungsten carbide spheres with different diameters for speed of sound (1 450 m/s) in fresh water ([35])
6 Survey design [Go to Page]
6.1 General
6.2 Design for appropriate resolution and detection
6.3 Pre-planning
6.4 Timing of surveys
6.5 Transducer orientation and position [Go to Page]
6.5.1 General
Table 3 — Comparison of factors influencing data quality for horizontal and vertical surveys [Go to Page]
6.5.2 Requirements specific to vertical surveys
6.5.3 Requirements specific to horizontal surveys
6.6 Requirements for acoustic inter-comparisons
7 Survey data acquisition [Go to Page]
7.1 Acoustic data
7.2 Echosounder settings
7.3 Data acquisition from additional equipment
8 Post-processing of acoustic data [Go to Page]
8.1 General
8.2 Pre-analysis [Go to Page]
8.2.1 Bottom detection
8.2.2 Discrimination [Go to Page]
8.2.2.1 General
8.2.2.2 Separating noise reverberation and setting TS thresholds
Figure 1 — Hypothetical example of unsuitable (Thr.3) and more suitable (Thr. 1 and 2) ways of setting the noise threshold for fisheries surveys [Go to Page]
8.2.2.3 Separating noise echoes by manual classification
8.2.3 Single Echo/Target Detection (SED/ST) scenarios [Go to Page]
8.2.3.1 General
8.2.3.2 Accurate size distribution when SNR is high (>10 dB)
8.2.3.3 Track counting when SNR is medium (<10 dB)
8.2.3.4 Track counting when SNR is low
8.3 Analysis [Go to Page]
8.3.1 Abundance estimate methods
8.3.2 Vertical surveys [Go to Page]
8.3.2.1 Method 1 - Echo integration
8.3.2.2 Method 2 - Track-counting
8.3.2.3 Method 3 - Echo-counting
8.3.3 Horizontal Surveys
8.3.4 Biomass estimates [Go to Page]
8.3.4.1 General
8.3.4.2 Vertical surveys
8.3.4.3 Horizontal surveys
9 Calculation of Results [Go to Page]
9.1 Aim
9.2 Identification of targets
9.3 Interpretation of Target Strength data
9.4 Determination of weight and biomass
9.5 Outputs of acoustic data [Go to Page]
9.5.1 Fish abundance as numerical density
9.5.2 Size structure
9.5.3 Biomass
9.6 Estimates of sampling variance and precision [Go to Page]
9.6.1 Precision of estimates
9.6.2 Simple Random Analysis
9.6.3 Stratified Analysis
10 Quality control and quality assurance [Go to Page]
10.1 General
10.2 Quality control
10.3 Quality assurance
11 Survey report [Go to Page]
11.1 General
11.2 Objectives, sampling location and staff
11.3 Equipment and prerequisites
11.4 Track details, site details and conditions
11.5 Survey results
Annex A (informative) Supplementary data
Table A.1 — Supplementary data used in the assessment of fish sampling data
Annex B (informative) Methods for estimates of fish abundance
Table B.1 — Summary of methods for estimates of fish abundance
Annex C (informative) Interpretation of TS into fish length and weight
Table C.1 — Regression relationships between target strength (TS) in dB and total length (TL) in millimetres or centimetres for dorsal aspect of fish, according to Formulae (C.1) or (C.2)
Table C.2 — Regression relationships between target strength (TS) in dB and total length (TL) in millimetres or centimetres for any body aspect in horizontal plane; α is angle of fish body in a beam in degrees
Table C.3 — Regression relationships between target strength (TS)in dB and total length (TL) in millimetres or centimetres for two discrete aspects of the horizontal plane: side aspect, according to Formula TS = A*log (TL)+B, or tail aspect, according...
Table C.4 — Regression relationships between target strength (TS) in dB and weight (W) in g or kg for two discrete aspects of the horizontal or vertical plane: side or dorsal aspect, according to Formula TS = A*log (W)+B, or tail aspect, according to ...
Annex D (informative) Deconvolution procedure
Table D.1 — An example of the deconvolution procedure applied to the all-aspects TS frequency distribution for the trout population in Loch of Boardhouse ([23])
Annex E (informative) Determination of the Elementary Distance Sampling Unit (EDSU)
Annex F (informative) Estimates of sampling variance and precision
Annex G (informative) Published inter-comparison studies
Figure G.1 — Regressions relating the results of the two teams for fish density values (a) and for biomass values (b) for each of the 12 transects at Stechlinsee
Figure G.2 — Regressions relating the results of the two teams for fish density values (a) and for biomass values (b) for each of the 9 transects at Irrsee
Bibliography
64_e_stf.pdf [Go to Page]
Contents Page
Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions, symbols and abbreviated terms [Go to Page]
3.1 Terms and definitions
3.2 Symbols and abbreviated terms
4 Principle and field of application
Table 1 — Suitability of hydroacoustic sampling techniques for inland water bodies and fish communities
5 Equipment [Go to Page]
5.1 General
5.2 System performance [Go to Page]
5.2.1 Minimum requirements
5.2.2 Optimum requirements
5.3 Calibration [Go to Page]
5.3.1 General
5.3.2 Types of calibration [Go to Page]
5.3.2.1 Full instrument and equipment calibration
5.3.2.2 Beam pattern calibration
5.3.2.3 Standard Target tests
Table 2 — Example values for target strengths (TS) of tungsten carbide spheres with different diameters for speed of sound (1 450 m/s) in fresh water [35]
6 Survey design [Go to Page]
6.1 General
6.2 Design for appropriate resolution and detection
6.3 Pre-planning
6.4 Timing of surveys
6.5 Transducer orientation and position [Go to Page]
6.5.1 General
Table 3 — Comparison of factors influencing data quality for horizontal and vertical surveys [Go to Page]
6.5.2 Requirements specific to vertical surveys
6.5.3 Requirements specific to horizontal surveys
6.6 Requirements for acoustic inter-comparisons
7 Survey data acquisition [Go to Page]
7.1 Acoustic data
7.2 Echosounder settings
7.3 Data acquisition from additional equipment
8 Post-processing of acoustic data [Go to Page]
8.1 General
8.2 Pre-analysis [Go to Page]
8.2.1 Bottom detection
8.2.2 Discrimination [Go to Page]
8.2.2.1 General
8.2.2.2 Separating noise reverberation and setting TS thresholds
Figure 1 — Hypothetical example of unsuitable (Thr.3) and more suitable (Thr. 1 and 2) ways of setting the noise threshold for fisheries surveys [Go to Page]
8.2.2.3 Separating noise echoes by manual classification
8.2.3 Single Echo/Target Detection (SED/ST) scenarios [Go to Page]
8.2.3.1 General
8.2.3.2 Accurate size distribution when SNR is high (>10 dB)
8.2.3.3 Track counting when SNR is medium (<10 dB)
8.2.3.4 Track counting when SNR is low
8.3 Analysis [Go to Page]
8.3.1 Abundance estimate methods
8.3.2 Vertical surveys [Go to Page]
8.3.2.1 Method 1 - Echo integration
8.3.2.2 Method 2 - Track-counting
8.3.2.3 Method 3 - Echo-counting
8.3.3 Horizontal Surveys
8.3.4 Biomass estimates [Go to Page]
8.3.4.1 General
8.3.4.2 Vertical surveys
8.3.4.3 Horizontal surveys
9 Calculation of Results [Go to Page]
9.1 Aim
9.2 Identification of targets
9.3 Interpretation of Target Strength data
9.4 Determination of weight and biomass
9.5 Outputs of acoustic data [Go to Page]
9.5.1 Fish abundance as numerical density
9.5.2 Size structure
9.5.3 Biomass
9.6 Estimates of sampling variance and precision [Go to Page]
9.6.1 Precision of estimates
9.6.2 Simple Random Analysis
9.6.3 Stratified Analysis
10 Quality control and quality assurance [Go to Page]
10.1 General
10.2 Quality control
10.3 Quality assurance
11 Survey report [Go to Page]
11.1 General
11.2 Objectives, sampling location and staff
11.3 Equipment and prerequisites
11.4 Track details, site details and conditions
11.5 Survey results
Annex A (informative) Supplementary data
Annex B (informative) Methods for estimates of fish abundance
Table B.1 — Summary of methods for estimates of fish abundance
Annex C (informative) Interpretation of TS into fish length and weight
Table C.1 — Regression relationships between target strength (TS) in dB and total length (TL) in millimetres or centimetres for dorsal aspect of fish, according to Formulae (C.1) or (C.2)
Table C.2 — Regression relationships between target strength (TS) in dB and total length (TL) in millimetres or centimetres for any body aspect in horizontal plane; α is angle of fish body in a beam in degrees
Table C.3 — Regression relationships between target strength (TS) in dB and total length (TL) in millimetres or centimetres for two discrete aspects of the horizontal plane: side aspect, according to Formula , or tail aspect, according to Formula
Table C.4 — Regression relationships between target strength (TS) in dB and weight (W) in g or kg for two discrete aspects of the horizontal or vertical plane: side or dorsal aspect, according to Formula TS = A*log (W)+B, or tail aspect, according to ...
Annex D (informative) Deconvolution procedure
Table D.1 — An example of the deconvolution procedure applied to the all-aspects TS frequency distribution for the trout population in Loch of Boardhouse ([23])
Annex E (informative) Determination of the Elementary Distance Sampling Unit (EDSU)
Annex F (informative) Estimates of sampling variance and precision
Annex G (informative) Published inter-comparison studies
Figure G.1 — Regressions relating the results of the two teams for fish density values (a) and for biomass values (b) for each of the 12 transects at Stechlinsee
Figure G.2 — Regressions relating the results of the two teams for fish density values (a) and for biomass values (b) for each of the 9 transects at Irrsee
Bibliography [Go to Page]

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BS EN 15910:2014 Water quality. Guidance on the estimation of fish abundance with mobile hydroacoustic methods, 2014

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