Scottish Marine and Freshwater Science Volume 5 Number 14: Electrofishing for Razor Clams (Ensis siliqua and E. arquatus): Effects on Survival and Recovery of Target and Non-Target Species
Trawling and tank based trials were conducted to assess whether electrofishing (which is currently prohibited under EU regulations) for razor clams Ensis siliqua and E. arquatus affects survival and behaviour patterns in Ensis spp. and non-target species.
Appendix
Video Clips
Video A1 : Diver collecting razor clams following electric rig
Video A2 : Sample video clips from FV Ensis
Video A3 : Sample video clips from FV Nicola Jane
Video A4 : Sandeels recovered on deck
Video A5 : E. siliqua emerging from the sediment during the tank trials
Video A6 : A. rubens exposed to the electric field
Video A7 : P. bernhardus exposed to the electric field
Video A8 : S. solida exposed to the electric field
Supplementary Data
Sediment Properties
Table A1: Particle size analysis summary for sediment samples taken during the boat trials and the sand used in the tanks.
| Particle size range |
Mean Percentage |
|||
|---|---|---|---|---|
| Fife |
Loch Nevis |
Clyde Sea Area |
Tanks |
|
| % >2 <63 µm |
2 |
0 |
3 |
2 |
| % >63 <125 µm |
34 |
0.2 |
3 |
14 |
| % >125 <150 µm |
35 |
7 |
12 |
7 |
| % >150 <250 µm |
22 |
25 |
28 |
39 |
| % >250 <500 µm |
7 |
59 |
51 |
28 |
| % >500 <1000 µm |
0 |
7 |
3 |
7 |
| % >1000 <2000 µm |
0 |
0 |
0 |
2 |
Figure A1: Particle size distributions for sediment samples taken during the boat trials and the sand used in the tanks.
Tank Experiments Supplementary Data
Table A2: Salinity, temperature and dissolved oxygen data for experimental tanks.
| Tank |
Salinity (ppm) Mean ± 1 SD |
Temperature (°C) Mean ± 1 SD |
Dissolved oxygen (% saturation) Mean ± 1 SD |
|---|---|---|---|
| A |
32 ± 2.165 |
7.9 ± 0.375 |
80 ± 7.044 |
| B |
32 ± 2.059 |
7.8 ± 0.435 |
84 ± 4.434 |
| C |
32 ± 2.201 |
7.7 ± 0.441 |
87 ± 6.468 |
| D |
32 ± 2.100 |
7.8 ± 0.413 |
87 ± 6.387 |
| E |
32 ± 2.160 |
7.8 ± 0.444 |
88 ± 6.258 |
| F |
32 ± 2.137 |
7.7 ± 0.393 |
81 ± 8.357 |
| G |
32 ± 2.110 |
7.7 ± 0.364 |
76 ± 6.770 |
Table A3: Electrical data from stimulus trials.
| Species |
Voltage (v) Mean ± 1 SD |
Current (A) Mean ± 1 SD |
|---|---|---|
| E. siliqua |
25.45 ± 0.115 |
43.2 ± 2.051 |
| A. rubens |
25.29 ± 0.499 |
41.6 ± 2.142 |
| P. bernhardus |
25.61 ± 0.087 |
43.0 ± 0.694 |
| S. solida |
25.56 ± 0.055 |
41.5 ± 2.039 |
Figure A2: Example voltage output of electric waveform.
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