Introduction
Materials and methods
Laboratory experiment and gape size limitation
Pond experiment
Field studies
Densities of perch larvae at coastal spawning sites
Site | Year | Hatching date (mmdd) | CPUE at hatching | CPUE after hatching (# days) |
---|---|---|---|---|
(A) Laxögern | 2011 | 0518 | 0 | 5.2 ± 0.9 (21) |
(B) Yttre Spelgrundet | 2011 | 0518 | 0 | 307 ± 90 (21) |
2012 | 0529 | 0 | 11 ± 9 (17) | |
(C) Inre Spelgrundet | 2012 | 0529 | 0 | 15 ± 25 (17) |
(D) Boviken | 2011 | 0527 | n.a. | 767 ± 497 (7)* |
(E) Västra Stadsviken | 2011 | 0527 | 3.7 ± 1.4 | 197 ± 50 (7) |
2012 | 0524 | 1.6 ± 2.6 | 38 ± 50 (8) | |
(F) Östra Stadsviken | 2012 | 0524 | 0.05 ± 0.1 | 13.2 ± 9.2 (14) |
(G) Tennavan | 2011 | 0517 | 0 | 0.1 ± 0.07 (21) |
(H) Inneravan | 2011 | 0517 | 0.1 ± 0.07 | 0.1 ± 0.07 (21) |
(I) Sörleviken (Gaviksfjärden) | 2011 | 0601 | 391 ± 525** | n.a. |
(J) Häggvik (Gaviksfjärden) | 2011 | 0601 | 51 ± 22 | 151 ± 52 (8) |