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Table 3
ANOVA statistics and average differences in mean back-calculated lengths (mm) at age i between pikeperch caught at age i or i+3. R2 is the adjusted R squared; * significance P < 0.05; ** P < 0.01.
| Gear | Back-calculated length at age (i) | Age of capture | Year-classes | N | R2 | Year-class df and F | Age df and F | Average difference in length at age (i) (mm) | |
|---|---|---|---|---|---|---|---|---|---|
| Both | 2 | 2+ and 5+ | 1997–1998, 2000–2009 | 5123 | 0.39 | 11; 292.5** | 1; 38.7** | −5.18 | |
| Both | 3 | 3+ and 6+ | 1996–2008 | 5941 | 0.11 | 12; 54.2** | 1; 75.8** | 8.40 | |
| Both | 4 | 4+ and 7+ | 1995–2007 | 5725 | 0.44 | 12; 57.7** | 1; 2511.5** | 44.73 | |
| Both | 5 | 5+ and 8+ | 1994–2006 | 7556 | 0.39 | 12; 26.7** | 1; 3870.3** | 57.68 | |
| Both | 6 | 6+ and 9+ | 1993–2005 | 6091 | 0.24 | 12; 11.5** | 1; 1674.8** | 58.24 | |
| Both | 7 | 7+ and 10+ | 1991–1992, 1995, 1997–2004 | 3441 | 0.18 | 10; 27.2** | 1; 369.6** | 47.45 | |
| Gillnet | 2 | 2+ and 5+ | 1997–1998, 2000–2009 | 3746 | 0.43 | 11; 251.1** | 1; 49.7** | −7.13 | |
| Gillnet | 3 | 3+ and 6+ | 1996–2008 | 4712 | 0.12 | 12; 49.6** | 1; 45.5** | 7.47 | |
| Gillnet | 4 | 4+ and 7+ | 1995–2007 | 4448 | 0.43 | 12; 47.5** | 1; 1961.9** | 45.27 | |
| Gillnet | 5 | 5+ and 8+ | 1994–2006 | 5124 | 0.42 | 12; 23.6** | 1; 3315.4** | 59.49 | |
| Gillnet | 6 | 6+ and 9+ | 1993–2005 | 4636 | 0.33 | 12; 10.1** | 1; 1924.8** | 63.43 | |
| Gillnet | 7 | 7+ and 10+ | 1991–1992, 1995, 1997–2004 | 2748 | 0.24 | 10; 23.0** | 1; 494.6** | 54.11 | |
| Trap net | 2 | 2+ and 5+ | 1997–1998, 2000–2009 | 1377 | 0.26 | 11; 43.4** | 1; 0.2 | −0.63 | |
| Trap net | 3 | 3+ and 6+ | 1996–2008 | 1229 | 0.15 | 12; 11.7** | 1; 46.5** | 13.34 | |
| Trap net | 4 | 4+ and 7+ | 1995–2007 | 1277 | 0.53 | 12; 11.1** | 1; 690.3** | 49.92 | |
| Trap net | 5 | 5+ and 8+ | 1994–2006 | 2432 | 0.37 | 12; 18.8** | 1; 572.8** | 58.60 | |
| Trap net | 6 | 6+ and 9+ | 1993–2005 | 1455 | 0.17 | 12; 13.1** | 1; 74.2** | 34.20 | |
| Trap net | 7 | 7+ and 10+ | 1997, 1999–2002, 2004 | 438 | 0.14 | 5; 11.5** | 1; 3.6* | 14.38 | |
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