Open Access
Table 2
Shrimp occurrence within full stomachs, divided per sampling season and year, and standard length range (SL, cm) of the 10 investigated species (au = autumn; wi = winter; sp = spring; su = summer).
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| SL | 1992 | 1994 | 1999 | 2003 | 2008 | ||||||||||||||||
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| (cm) | au | wi | sp | su | au | wi | sp | su | au | wi | sp | su | au | wi | sp | Su | au | wi | sp | su | |
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| A. anguilla | 25–30 | 0.14 | 0.20 | 0.11 | 0.20 | ||||||||||||||||
| 30–35 | 0.14 | 0.13 | 0.20 | 0.17 | |||||||||||||||||
| 35–40 | 0.20 | 0.18 | 0.17 | 0.14 | |||||||||||||||||
| 40–45 | 0.13 | 0.20 | 0.22 | 0.14 | |||||||||||||||||
| 45–50 | 0.11 | 0.25 | 0.25 | 0.25 | |||||||||||||||||
| A. boyeri | 0–5 | 0.50 | – | – | 0.67 | 0.56 | – | – | 0.50 | ||||||||||||
| 5–10 | 0.17 | 0.21 | 0.20 | 0.18 | 0.21 | 0.15 | 0.20 | 0.18 | |||||||||||||
| C. lavaretus | 5–10 | 0.25 | – | – | 0.25 | 0.40 | – | – | 0.25 | 0.33 | – | – | 0.33 | 0.50 | – | – | 0.33 | 0.50 | – | – | 0.33 |
| 10–15 | – | – | – | 0.08 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | |
| 15–20 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 0.08 | – | – | – | |
| 20–25 | – | – | 0.09 | – | – | – | – | – | 0.10 | – | – | – | – | – | – | – | – | – | – | – | |
| 25–30 | 0.08 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 0.08 | – | – | – | |
| E. lucius | 10–15 | 0.25 | 0.17 | 0.25 | – | 0.20 | – | 0.25 | 0.17 | – | 0.20 | 0.33 | 0.14 | ||||||||
| 15–20 | 0.38 | 0.43 | 0.44 | 0.40 | 0.38 | 0.38 | 0.43 | 0.33 | 0.33 | 0.25 | 0.33 | 0.43 | |||||||||
| 20–25 | 0.25 | 0.40 | 0.27 | 0.25 | 0.33 | 0.43 | 0.27 | 0.33 | 0.22 | 0.27 | 0.25 | 0.13 | |||||||||
| 25–30 | 0.25 | 0.22 | 0.23 | 0.25 | 0.40 | 0.14 | 0.27 | 0.18 | 0.15 | 0.14 | 0.40 | 0.25 | |||||||||
| 30–35 | 0.30 | 0.27 | – | 0.29 | 0.33 | – | 0.20 | 0.33 | 0.27 | 0.38 | 0.33 | 0.25 | |||||||||
| 35–40 | – | – | – | – | – | – | 0.09 | – | – | – | – | – | |||||||||
| 40–45 | – | – | – | – | – | – | – | – | – | – | – | – | |||||||||
| 45–50 | – | 0.11 | – | – | – | – | – | – | – | – | 0.09 | – | |||||||||
| P. fluviatilis | 5–10 | 0.25 | – | 0.29 | 0.25 | 0.17 | – | 0.17 | 0.14 | ||||||||||||
| 10–15 | 0.13 | 0.17 | – | 0.17 | 0.29 | 0.25 | 0.20 | 0.29 | |||||||||||||
| 15–20 | 0.27 | 0.22 | 0.23 | 0.27 | 0.36 | 0.22 | 0.25 | 0.27 | |||||||||||||
| 20–25 | 0.40 | 0.25 | 0.38 | 0.27 | – | 0.17 | – | 0.22 | |||||||||||||
| 25–30 | 0.40 | 0.46 | 0.40 | 0.43 | 0.38 | 0.36 | 0.30 | 0.38 | |||||||||||||
| 30–35 | 0.27 | 0.38 | 0.31 | 0.33 | 0.33 | 0.63 | 0.20 | 0.25 | |||||||||||||
| 35–40 | 0.45 | 0.42 | 0.56 | 0.36 | 0.33 | 0.27 | 0.36 | 0.36 | |||||||||||||
| M. salmoides | 5–10 | 0.67 | 0.50 | 0.50 | 0.67 | 0.50 | 0.50 | 0.60 | 0.67 | ||||||||||||
| 10–15 | 0.44 | 0.40 | 0.43 | 0.44 | 0.50 | 0.50 | 0.38 | 0.43 | |||||||||||||
| 15–20 | 0.20 | 0.14 | 0.25 | 0.18 | 0.21 | 0.20 | 0.23 | 0.18 | |||||||||||||
| 20–25 | 0.30 | 0.43 | 0.57 | 0.22 | 0.43 | 0.33 | 0.50 | 0.18 | |||||||||||||
| 25–30 | 0.22 | 0.20 | 0.22 | 0.18 | 0.25 | 0.20 | 0.22 | 0.22 | |||||||||||||
| C. carpio | 10–15 | 0.17 | 0.14 | – | 0.17 | 0.14 | 0.20 | – | 0.25 | ||||||||||||
| 15–20 | 0.13 | 0.18 | 0.13 | 0.20 | 0.13 | 0.10 | 0.17 | 0.14 | |||||||||||||
| 20–25 | 0.18 | – | 0.08 | 0.14 | 0.18 | 0.25 | 0.20 | 0.11 | |||||||||||||
| 25–30 | 0.11 | 0.10 | – | 0.18 | 0.20 | 0.14 | 0.13 | 0.11 | |||||||||||||
| 30–35 | – | 0.10 | 0.09 | 0.13 | 0.14 | 0.11 | – | 0.10 | |||||||||||||
| 35–40 | 0.13 | 0.17 | 0.22 | 0.13 | – | 0.11 | 0.13 | 0.14 | |||||||||||||
| L. gibbosus | 5–10 | 0.17 | – | 0.17 | – | – | 0.14 | 0.17 | – | ||||||||||||
| 10–15 | 0.23 | 0.17 | 0.20 | 0.15 | 0.21 | 0.18 | 0.22 | 0.17 | |||||||||||||
| 15–20 | 0.38 | 0.38 | 0.40 | 0.36 | 0.33 | 0.38 | 0.40 | 0.33 | |||||||||||||
| R. rubilio | 0–5 | 0.25 | – | – | 0.14 | – | – | 0.17 | – | ||||||||||||
| 5–10 | – | 0.20 | 0.14 | – | 0.20 | – | 0.25 | 0.17 | |||||||||||||
| 10–15 | 0.07 | – | 0.10 | – | 0.10 | 0.09 | 0.09 | – | |||||||||||||
| 15–20 | 0.11 | 0.10 | – | 0.09 | 0.13 | – | 0.08 | 0.13 | |||||||||||||
| T. tinca | 5–10 | 0.20 | 0.14 | 0.10 | – | – | 0.14 | 0.14 | – | ||||||||||||
| 10–15 | – | 0.25 | – | – | 0.13 | 0.11 | – | 0.33 | |||||||||||||
| 15–20 | 0.10 | – | 0.09 | – | – | 0.10 | 0.09 | 0.13 | |||||||||||||
| 20–25 | – | – | 0.13 | 0.09 | 0.09 | – | 0.14 | – | |||||||||||||
| 25–30 | 0.08 | 0.11 | – | 0.08 | – | – | – | 0.14 | |||||||||||||
| 30–35 | – | 0.11 | – | 0.09 | 0.13 | – | – | 0.11 | |||||||||||||
| 35–40 | – | – | 0.09 | – | 0.09 | – | 0.13 | – | |||||||||||||
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