Table 3 Biomass index (kg/km2), standard deviation (SD) and coefficient of variation (CV) of P. erythrinus by depth and in the overall bathymetric range for each survey
Depth | Biomass index (kg/km2) | Survey | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | ||
10–50 m | Mean | 6.2 | 24.3 | 65.9 | 56.7 | 25.0 | 29.2 | 69.4 | 96.2 | 210.4 | 268.0 | 31.3 | 20.0 | 27.3 | 13.3 | 20.3 |
SD | 0.2 | 7.8 | 26.4 | 20.1 | 6.8 | 7.0 | 21.2 | 35.0 | 74.9 | 80.2 | 2.6 | 3.2 | 2.5 | 2.5 | 5.9 | |
CVÂ % | 3.7 | 32.3 | 40.2 | 35.4 | 27.3 | 23.9 | 30.6 | 36.3 | 35.6 | 29.9 | 8.4 | 15.9 | 9.1 | 19.1 | 29.1 | |
51–100 m | Mean | 63.8 | 24.7 | 48.3 | 73.2 | 31.7 | 36.6 | 55.0 | 64.6 | 50.3 | 9.9 | 5.9 | 38.0 | 13.4 | 24.5 | 10.5 |
SD | 17.9 | 10.4 | 20.2 | 26.4 | 12.7 | 13.2 | 18.7 | 23.9 | 15.7 | 2.8 | 0.2 | 15.3 | 3.3 | 9.5 | 0.8 | |
CVÂ % | 28.1 | 42.1 | 41.9 | 36.1 | 40.0 | 36.1 | 34.0 | 37.0 | 31.2 | 28.5 | 3.0 | 40.3 | 24.7 | 38.9 | 7.7 | |
101–200 m | Mean | 5.7 | 15.3 | 0.0 | 0.0 | 5.7 | 2.7 | 6.6 | 4.2 | 0.0 | 0.0 | 0.0 | 1.2 | 4.0 | 1.3 | 1.4 |
SD | 3.1 | 7.4 | 0.0 | 0.0 | 2.5 | 1.6 | 1.8 | 1.2 | 0.0 | 0.0 | 0.0 | 0.5 | 1.6 | 0.6 | 0.7 | |
CVÂ % | 53.4 | 48.3 | 0.0 | 0.0 | 43.9 | 57.7 | 27.7 | 29.9 | 0.0 | 0.0 | 0.0 | 40.6 | 38.9 | 42.7 | 50.2 | |
10–200 m | Mean | 21.8 | 20.4 | 31.1 | 35.6 | 18.2 | 18.8 | 36.9 | 45.9 | 67.7 | 68.8 | 9.4 | 16.4 | 12.5 | 10.7 | 8.8 |
SD | 10.8 | 7.8 | 17.2 | 17.5 | 7.5 | 8.0 | 15.0 | 22.2 | 39.3 | 44.8 | 3.2 | 7.9 | 3.0 | 5.0 | 3.3 | |
CVÂ % | 49.5 | 38.3 | 55.5 | 49.3 | 41.5 | 42.8 | 40.7 | 48.3 | 58.1 | 65.0 | 33.6 | 48.2 | 24.4 | 46.6 | 37.1 | |