Depth | Density index (N/km2) | Survey | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | ||
10–50 m | Mean | 140 | 412 | 626 | 445 | 443 | 446 | 183 | 1028 | 1378 | 1605 | 388 | 239 | 371 | 159 | 94 |
SD | 7 | 125 | 239 | 138 | 139 | 104 | 37 | 325 | 487 | 499 | 34 | 26 | 9 | 27 | 12 | |
CVÂ % | 5 | 30 | 38 | 31 | 31 | 23 | 20 | 32 | 35 | 31 | 9 | 11 | 2 | 17 | 12 | |
f | 100 | 100 | 75 | 75 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | |
51–100 m | Mean | 777 | 232 | 376 | 665 | 235 | 295 | 489 | 456 | 361 | 194 | 63 | 264 | 134 | 299 | 120 |
SD | 227 | 91 | 158 | 236 | 93 | 99 | 158 | 152 | 83 | 49 | 8 | 106 | 28 | 115 | 6 | |
CVÂ % | 29 | 39 | 42 | 35 | 39 | 34 | 32 | 33 | 23 | 25 | 12 | 40 | 21 | 38 | 5 | |
f | 50 | 50 | 25 | 50 | 50 | 100 | 100 | 100 | 100 | 100 | 100 | 33 | 67 | 67 | 100 | |
101–200 m | Mean | 67 | 140 | 0 | 0 | 45 | 19 | 64 | 35 | 0 | 0 | 0 | 15 | 27 | 11 | 12 |
SD | 36 | 68 | 0 | 0 | 20 | 11 | 18 | 14 | 0 | 0 | 0 | 6 | 10 | 4 | 6 | |
CVÂ % | 54 | 49 | 0 | 0 | 44 | 58 | 27 | 41 | 0 | 0 | 0 | 38 | 36 | 34 | 50 | |
f | 33 | 67 | 0 | 0 | 50 | 17 | 67 | 50 | 0 | 0 | 0 | 40 | 40 | 40 | 20 | |
10–200 m | Mean | 278 | 240 | 272 | 304 | 205 | 204 | 214 | 420 | 452 | 449 | 114 | 142 | 144 | 128 | 64 |
SD | 134 | 89 | 149 | 146 | 89 | 81 | 88 | 195 | 255 | 274 | 40 | 56 | 36 | 60 | 13 | |
CVÂ % | 48 | 37 | 55 | 48 | 43 | 40 | 41 | 46 | 56 | 61 | 35 | 40 | 25 | 47 | 21 | |
f | 54 | 71 | 29 | 36 | 64 | 64 | 86 | 79 | 55 | 55 | 55 | 55 | 64 | 64 | 64 |