Scottish Marine and Freshwater Science Volume 3 Number 8: Catch Comparison Trials with the Faithlie Cod Avoidance Panel (FCAP)
Describes catch comparison trials that were conducted in the North Sea to evaluate the Faithlie Cod Avoidance Panel (FCAP) that has been developed by Willie Hepburn of Faithlie Trawls, Fraserburgh.
Tables
Table 1 Mesh measurements using the OMEGA gauge set to 125Nm measuring force.
| Description | Codend (mm) | Square mesh panel (mm) |
|---|---|---|
| Control Fidelis | 84.2 | 112.4 |
| Test Fidelis | 84.6 | 121.0 |
| Control Letterbox | 81.5 | 112.7 |
| Test Letterbox | 82.0 | 133.3 |
Table 2 Cod results comparing a standard Fidelis trawl (control) and a Fidelis trawl with an FCAP inserted (test).
| Haul No | Live weight (kg) | % difference in live weight | Number of fish | % difference in numbers | ||
|---|---|---|---|---|---|---|
| Control | Test ( FCAP) | Test/Control | Control | Test ( FCAP) | Test/Control | |
| 1 | 26 | 21 | -20 | 23 | 19 | -17 |
| 2 | 465 | 184 | -61 | 195 | 111 | -43 |
| 3 | 657 | 250 | -62 | 278 | 131 | -53 |
| 4 | 270 | 490 | 81 | 122 | 196 | 60 |
| 5 | 208 | 147 | -29 | 102 | 84 | -18 |
| 6 | 318 | 240 | -25 | 122 | 97 | -20 |
| 7 | 358 | 203 | -43 | 139 | 79 | -43 |
| 8 | 543 | 304 | -44 | 239 | 176 | -26 |
| Hauls combined | 2845 | 1839 | -35 | 1220 | 893 | -27 |
Table 3 Cod results comparing a Letterbox trawl (control) and a Letterbox trawl with an FCAP inserted (test).
| Haul No | Live weight (kg) | % difference in live weight | Number of fish | % difference in numbers | ||
|---|---|---|---|---|---|---|
| Control | Test ( FCAP) | Test/Control | Control | Test ( FCAP) | Test/Control | |
| 11 | 511 | 424 | -17 | 232 | 227 | -2 |
| 12 | 449 | 373 | -17 | 196 | 173 | -12 |
| 15 | 385 | 221 | -43 | 181 | 98 | -46 |
| 18 | 203 | 152 | -25 | 121 | 97 | -20 |
| Hauls combined | 1548 | 1170 | -24 | 730 | 595 | -18 |
Table 4 Cod results comparing a standard Fidelis trawl (control) and a Fidelis trawl with a modified FCAP ( FCAP2) inserted (test).
| Haul No | Live weight (kg) | % difference in live weight | Number of fish | % difference in numbers | ||
|---|---|---|---|---|---|---|
| Control | Test ( FCAP2) | Test/Control | Control | Test ( FCAP2) | Test/Control | |
| 9 | 240 | 123 | -49 | 113 | 75 | -34 |
| 10 | 437 | 112 | -74 | 198 | 73 | -63 |
| 13 | 554 | 209 | -62 | 266 | 106 | -60 |
| 14 | 232 | 93 | -60 | 180 | 53 | -71 |
| 16 | 435 | 172 | -60 | 191 | 115 | -40 |
| 17 | 463 | 184 | -60 | 222 | 104 | -53 |
| 19 | 137 | 46 | -67 | 107 | 35 | -67 |
| Hauls combined | 2498 | 939 | -62 | 1277 | 561 | -56 |
Table 5 Cod results for alternate hauls comparing Fidelis and "Lettrerbox" control trawls.
| Haul Nos | Live weight (kg) | % difference in live weight | Number of fish | % difference in numbers | ||
|---|---|---|---|---|---|---|
| Fidelis | Letterbox | Letterbox/Fidelis | Fidelis | Letterbox | Letterbox/Fidelis | |
| 10 v 11 | 437 | 511 | 17 | 198 | 232 | 17 |
| 12 v 13 | 555 | 449 | -26 | 266 | 196 | -26 |
| 14 v 15 | 232 | 385 | 66 | 180 | 181 | 0 |
| 18 v 19 | 137 | 203 | 48 | 107 | 121 | 13 |
| Hauls combined | 1362 | 1548 | 14 | 751 | 730 | -3 |
Table 6 Bulk haddock results comparing (i) a standard Fidelis trawl with and without an FCAP; (ii) a Letterbox trawl with and without an FCAP; and (iii) a Fidelis trawl with and without an FCAP2.
| Gear | Live weight (kg) | % difference in live weight | Number of fish | % difference in numbers | ||
|---|---|---|---|---|---|---|
| Control | Test | Test/Control | Control | Test | Test/Control | |
| FCAP in Fidelis | 895 | 367 | -59 | 2497 | 1063 | -57 |
| FCAP in Letterbox | 58 | 44 | -24 | 177 | 136 | -23 |
| FCAP2 in Fidelis | 595 | 155 | -74 | 1679 | 423 | -75 |
Table 7 Bulk whiting results comparing (i) a standard Fidelis trawl with and without an FCAP; (ii) a Letterbox trawl with and without an FCAP; and (iii) a Fidelis trawl with and without an FCAP2.
| Gear | Live weight (kg) | % difference in live weight | Number of fish | % difference in numbers | ||
|---|---|---|---|---|---|---|
| Control | Test | Test/Control | Control | Test | Test/Control | |
| FCAP in Fidelis | 385 | 227 | -41 | 896 | 532 | -41 |
| FCAP in Letterbox | 31 | 15 | -50 | 91 | 35 | -62 |
| FCAP2 in Fidelis | 225 | 76 | -66 | 429 | 156 | -64 |
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