Detailed Insight into Gillnet Catches: Fish Directivity and Micro Distribution
Abstract
:1. Introduction
2. Materials and Methods
3. Results
4. Discussion
5. Conclusions
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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MBS | MBD | MP1 | |||||||
---|---|---|---|---|---|---|---|---|---|
Species | Inshore | Offshore | p | Inshore | Offshore | p | Inshore | Offshore | p |
Abramis brama | 11.11 ± 18.59 | 29.63 ± 53.82 | ns | 3.7 ± 9.07 | 25.93 ± 29.54 | ns | 1.85 ± 4.54 | 5.56 ± 6.09 | ns |
Alburnus alburnus | 611.11 ± 381.49 | 777.78 ± 688.24 | ns | 307.41 ± 380.62 | 437.04 ± 494.25 | ns | 437.04 ± 101.51 | 477.78 ± 170.4 | ns |
Gymnocephalus cernua | 25.93 ± 21.85 | 51.85 ± 43.7 | ns | 66.67 ± 81.95 | 40.74 ± 40.77 | ** | 0 ± 0 | 0 ± 0 | ns |
Leuciscus aspius | 18.52 ± 25.98 | 22.22 ± 37.18 | ns | 11.11 ± 27.22 | 11.11 ± 12.17 | ns | 1.85 ± 4.54 | 0 ± 0 | ns |
Perca fluviatilis | 155.56 ± 149.4 | 125.93 ± 62.33 | ns | 96.3 ± 66.91 | 192.59 ± 143.1 | ns | 7.41 ± 9.07 | 3.7 ± 5.74 | ns |
Rutilus rutilus | 303.7 ± 165.5 | 314.81 ± 92.61 | ns | 162.96 ± 87.39 | 229.63 ± 97.03 | ns | 38.89 ± 32.77 | 14.81 ± 15.18 | ns |
Sander lucioperca | 11.11 ± 18.59 | 7.41 ± 11.48 | ns | 7.41 ± 11.48 | 7.41 ± 18.14 | ns | 0 ± 0 | 0 ± 0 | ns |
Scardinius erythrophthalmus | 0 ± 0 | 0 ± 0 | ns | 0 ± 0 | 0 ± 0 | ns | 0 ± 0 | 0 ± 0 | ns |
Silurus glanis | 0 ± 0 | 0 ± 0 | ns | 3.7 ± 9.07 | 0 ± 0 | ns | 1.85 ± 4.54 | 0 ± 0 | ns |
Gillnet | 1137.04 ± 465.59 | 1329.63 ± 674.09 | ns | 659.26 ± 455.35 | 944.44 ± 539 | ns | 488.89 ± 104.94 | 501.85 ± 151.6 | ns |
MTP | Center | STP | |||||||
Species | Inshore | Offshore | p | Mild | Steep | p | Inshore | Offshore | p |
Abramis brama | 1.85 ± 4.32 | 0 ± 0 | ns | 0 ± 0 | 3.7 ± 9.07 | ns | 4.63 ± 10 | 1.85 ± 4.32 | ns |
Alburnus alburnus | 392.59 ± 119.51 | 414.81 ± 96.67 | ns | 348.15 ± 138.9 | 362.96 ± 124.66 | ns | 361.11 ± 127.61 | 342.59 ± 68.96 | ns |
Gymnocephalus cernua | 0 ± 0 | 0 ± 0 | ns | 0 ± 0 | 0 ± 0 | ns | 0 ± 0 | 0 ± 0 | ns |
Leuciscus aspius | 0.93 ± 3.21 | 1.85 ± 4.32 | ns | 0 ± 0 | 1.85 ± 4.54 | ns | 1.85 ± 6.42 | 2.78 ± 5.03 | ns |
Perca fluviatilis | 0.93 ± 3.21 | 0.93 ± 3.21 | ns | 0 ± 0 | 1.85 ± 4.54 | ns | 0.93 ± 3.21 | 2.78 ± 5.03 | ns |
Rutilus rutilus | 31.48 ± 22.14 | 19.44 ± 12.65 | ns | 20.37 ± 20.39 | 14.81 ± 16.73 | ns | 21.3 ± 16.04 | 18.52 ± 13.68 | ns |
Sander lucioperca | 2.78 ± 5.03 | 0.93 ± 3.21 | ns | 1.85 ± 4.54 | 1.85 ± 4.54 | ns | 1.85 ± 4.32 | 0.93 ± 3.21 | ns |
Scardinius erythrophthalmus | 0.93 ± 3.21 | 0 ± 0 | ns | 0 ± 0 | 0 ± 0 | ns | 0.93 ± 3.21 | 0 ± 0 | ns |
Silurus glanis | 0 ± 0 | 0 ± 0 | ns | 0 ± 0 | 0 ± 0 | ns | 0 ± 0 | 0 ± 0 | ns |
Gillnet | 431.48 ± 124.08 | 437.96 ± 101.22 | ns | 370.37 ± 146.51 | 387.04 ± 146.47 | ns | 392.59 ± 126.72 | 369.44 ± 70.61 | ns |
SP1 | SBD | SBS | |||||||
Species | Inshore | Offshore | p | Inshore | Offshore | p | Inshore | Offshore | p |
Abramis brama | 1.85 ± 4.54 | 0 ± 0 | ns | 14.81 ± 26.91 | 11.11 ± 12.17 | ns | 11.11 ± 27.22 | 0 ± 0 | ns |
Alburnus alburnus | 455.56 ± 168.36 | 625.93 ± 269.31 | ns | 44.44 ± 68.85 | 70.37 ± 172.37 | ns | 555.56 ± 800.49 | 237.04 ± 244.92 | ns |
Gymnocephalus cernua | 0 ± 0 | 0 ± 0 | ns | 29.63 ± 33.46 | 62.96 ± 55.18 | ns | 62.96 ± 80.02 | 59.26 ± 53.82 | ns |
Leuciscus aspius | 12.96 ± 8.36 | 1.85 ± 4.54 | ** | 0 ± 0 | 0 ± 0 | ns | 14.81 ± 18.14 | 18.52 ± 16.73 | ns |
Perca fluviatilis | 5.56 ± 9.3 | 5.56 ± 9.3 | ns | 55.56 ± 41.57 | 77.78 ± 43.89 | ns | 85.19 ± 32.71 | 70.37 ± 68.01 | ns |
Rutilus rutilus | 35.19 ± 25.74 | 61.11 ± 48.05 | ns | 159.26 ± 87.11 | 144.44 ± 94.02 | ns | 344.44 ± 154.44 | 329.63 ± 235.77 | ns |
Sander lucioperca | 1.85 ± 4.54 | 0 ± 0 | ns | 0 ± 0 | 0 ± 0 | ns | 3.7 ± 9.07 | 7.41 ± 18.14 | ns |
Scardinius erythrophthalmus | 0 ± 0 | 7.41 ± 5.74 | ns | 0 ± 0 | 0 ± 0 | ns | 3.7 ± 9.07 | 0 ± 0 | ns |
Silurus glanis | 0 ± 0 | 0 ± 0 | ns | 3.7 ± 9.07 | 7.41 ± 11.48 | ns | 3.7 ± 9.07 | 0 ± 0 | ns |
Gillnet | 512.96 ± 186.91 | 701.85 ± 284.27 | ns | 307.41 ± 152.94 | 374.07 ± 258.93 | ns | 1085.19 ± 907.74 | 722.22 ± 324.09 | ns |
MBS | MBD | MP1 | |||||||
---|---|---|---|---|---|---|---|---|---|
Species | Inshore | Offshore | p | Inshore | Offshore | p | Inshore | Offshore | p |
A. brama | 0.37 ± 0.29 | 3.35 ± 2.28 | ns | 0.13 ± 0.13 | 5.35 ± 4.66 | ns | 0.03 ± 0.03 | 0.93 ± 0.8 | ns |
A. alburnus | 13.28 ± 3.37 | 14.67 ± 4.22 | ns | 6.04 ± 2.94 | 9.23 ± 3.96 | ns | 9.91 ± 0.97 | 11.23 ± 1.67 | ns |
G. cernua | 0.19 ± 0.07 | 0.34 ± 0.13 | ns | 0.33 ± 0.16 | 0.16 ± 0.06 | ns | 0 ± 0 | 0 ± 0 | ns |
L. aspius | 2.68 ± 1.66 | 1.19 ± 0.81 | ns | 4.17 ± 4.17 | 1.49 ± 1.08 | ns | 0.09 ± 0.09 | 0 ± 0 | ns |
P. fluviatilis | 9.18 ± 2.61 | 7.22 ± 2.57 | ns | 3.88 ± 2.01 | 5.25 ± 2.4 | ns | 1.28 ± 0.78 | 0.81 ± 0.53 | ns |
R. rutilus | 10.46 ± 3.3 | 9.04 ± 1.33 | ns | 4.33 ± 1.01 | 7.5 ± 2.13 | ns | 3.98 ± 1.71 | 1.94 ± 1.28 | ns |
S. lucioperca | 3.88 ± 2.6 | 0.9 ± 0.6 | ns | 1.3 ± 0.82 | 0.58 ± 0.58 | ns | 0 ± 0 | 0 ± 0 | ns |
S. erythrophthalmus | 0 ± 0 | 0 ± 0 | ns | 0 ± 0 | 0 ± 0 | ns | 0 ± 0 | 0 ± 0 | ns |
S. glanis | 0 ± 0 | 0 ± 0 | ns | 0.92 ± 0.92 | 0 ± 0 | ns | 1.44 ± 1.44 | 0 ± 0 | ns |
Gillnet | 40.03 ± 26.42 | 36.72 ± 9.24 | ns | 21.11 ± 25.84 | 29.56 ± 18.46 | ns | 16.73 ± 5 | 14.92 ± 2.5 | ns |
MTP | Center | STP | |||||||
Species | Inshore | Offshore | p | Mild | Steep | p | Inshore | Offshore | p |
A. brama | 0.04 ± 0.04 | 0 ± 0 | ns | 0 ± 0 | 0.13 ± 0.13 | ns | 0.14 ± 0.08 | 0.06 ± 0.05 | ns |
A. alburnus | 8.86 ± 0.98 | 9.52 ± 0.69 | ns | 7.53 ± 1.33 | 8.22 ± 1.06 | ns | 8.4 ± 0.92 | 7.96 ± 0.68 | ns |
G. cernua | 0 ± 0 | 0 ± 0 | ns | 0 ± 0 | 0 ± 0 | ns | 0 ± 0 | 0 ± 0 | ns |
L. aspius | 0.24 ± 0.24 | 0.16 ± 0.11 | ns | 0 ± 0 | 1.07 ± 1.07 | ns | 0.35 ± 0.35 | 0.31 ± 0.22 | ns |
P. fluviatilis | 0.21 ± 0.21 | 0.1 ± 0.1 | ns | 0 ± 0 | 0.25 ± 0.25 | ns | 0.3 ± 0.3 | 0.49 ± 0.29 | ns |
R. rutilus | 1.97 ± 0.96 | 1.88 ± 0.63 | ns | 0.89 ± 0.77 | 0.12 ± 0.06 | ns | 0.7 ± 0.36 | 0.59 ± 0.34 | ns |
S. lucioperca | 0.41 ± 0.3 | 1.05 ± 1.05 | ns | 1.09 ± 1.09 | 0.66 ± 0.66 | ns | 0.69 ± 0.49 | 0.82 ± 0.82 | ns |
S. erythrophthalmus | 0.49 ± 0.49 | 0 ± 0 | ns | 0 ± 0 | 0 ± 0 | ns | 0.46 ± 0.46 | 0 ± 0 | ns |
S. glanis | 0 ± 0 | 0 ± 0 | ns | 0 ± 0 | 0 ± 0 | ns | 0 ± 0 | 0 ± 0 | ns |
Gillnet | 12.21 ± 4.26 | 12.71 ± 5.6 | ns | 9.51 ± 3.96 | 10.45 ± 4.78 | ns | 11.04 ± 3.88 | 10.23 ± 4.25 | ns |
SP1 | SBD | SBS | |||||||
Species | Inshore | Offshore | p | Inshore | Offshore | p | Inshore | Offshore | p |
A. brama | 1.65 ± 1.65 | 0 ± 0 | ns | 0.17 ± 0.13 | 0.2 ± 0.1 | ns | 0.23 ± 0.23 | 0 ± 0 | ns |
A. alburnus | 9.91 ± 1.78 | 12.29 ± 1.5 | ns | 0.68 ± 0.44 | 1.44 ± 1.44 | ns | 10.02 ± 5.51 | 4.6 ± 1.93 | ns |
G. cernua | 0 ± 0 | 0 ± 0 | ns | 0.19 ± 0.08 | 0.46 ± 0.17 | ns | 0.35 ± 0.14 | 0.38 ± 0.14 | ns |
L. aspius | 4 ± 2.41 | 0.08 ± 0.08 | ns | 0 ± 0 | 0 ± 0 | ns | 4.68 ± 3.88 | 1.02 ± 0.37 | ns |
P. fluviatilis | 1.87 ± 1.41 | 0.42 ± 0.38 | ns | 2.77 ± 1.08 | 4.04 ± 2.35 | ns | 4.71 ± 3.17 | 2.46 ± 1.11 | ns |
R. rutilus | 0.71 ± 0.22 | 1.22 ± 0.69 | ns | 4.46 ± 2.42 | 4.98 ± 2.39 | ns | 5.26 ± 1.06 | 5.16 ± 2.05 | ns |
S. lucioperca | 0.29 ± 0.29 | 0 ± 0 | ns | 0 ± 0 | 0 ± 0 | ns | 4.49 ± 4.49 | 0.45 ± 0.45 | ns |
S. erythrophthalmus | 0 ± 0 | 1.73 ± 0.94 | ns | 0 ± 0 | 0 ± 0 | ns | 1.06 ± 1.06 | 0 ± 0 | ns |
S. glanis | 0 ± 0 | 0 ± 0 | ns | 0.54 ± 0.54 | 0.42 ± 0.33 | ns | 0.03 ± 0.03 | 0 ± 0 | ns |
Gillnet | 18.43 ± 12.19 | 15.73 ± 5.94 | ns | 8.81 ± 7.9 | 11.53 ± 9.24 | ns | 30.83 ± 17.47 | 14.07 ± 6.91 | ns |
MBS | MBD | MP1 | |||||||
---|---|---|---|---|---|---|---|---|---|
Species | Inshore | Offshore | p | Inshore | Offshore | p | Inshore | Offshore | p |
A. brama | 110.67 ± 25.42 | 150 ± 58.55 | ns | 118 | 163.57 ± 96.39 | ns | 92 | 163 ± 93.5 | ns |
A. alburnus | 114.13 ± 16.97 | 109.48 ± 15.24 | ns | 110.8 ± 15.89 | 112.69 ± 18.3 | ns | 116.2 ± 15.69 | 117.83 ± 14.74 | ns |
G. cernua | 67.57 ± 9.25 | 62 ± 18.49 | ns | 56.94 ± 15.1 | 53.55 ± 12.47 | ns | - | - | ns |
L. aspius | 201 ± 57.6 | 152.67 ± 8.62 | ns | 243.33 ± 144.68 | 190 ± 73.82 | ns | 148 | - | ns |
P. fluviatilis | 97 ± 74.3 | 104.79 ± 70.45 | ns | 88.78 ± 64.89 | 77.98 ± 53.31 | ns | 203.75 ± 28.69 | 222.5 ± 24.75 | ns |
R. rutilus | 103.01 ± 37.84 | 99.39 ± 32.59 | ns | 103.84 ± 22.76 | 102.5 ± 35.69 | ns | 128.86 ± 72.27 | 142.5 ± 84.48 | ns |
S. lucioperca | 290 ± 76.97 | 210 ± 28.28 | ns | 240 ± 0 | 167 ± 74.95 | ns | - | - | ns |
S. erythrophthalmus | - | - | ns | - | - | ns | - | - | ns |
S. glanis | - | - | ns | 340 | - | ns | 480 | - | ns |
MTP | Center | STP | |||||||
Species | Inshore | Offshore | p | Mild | Steep | p | Inshore | Offshore | p |
A. brama | 80 ± 56.57 | - | ns | - | 116 ± 19.8 | ns | 106.6 ± 26.6 | 109.5 ± 36.06 | ns |
A. alburnus | 115.88 ± 16.11 | 116.5 ± 16.13 | ns | 113.98 ± 17.06 | 116.08 ± 15.97 | ns | 116.37 ± 17.86 | 116.65 ± 17.17 | ns |
G. cernua | - | - | ns | - | - | ns | - | - | ns |
L. aspius | 260 | 180 ± 7.07 | ns | - | 340 | ns | 217.5 ± 88.39 | 185 ± 56.79 | ns |
P. fluviatilis | 225 | 175 | ns | - | 190 | ns | 255 | 201.67 ± 42.52 | ns |
R. rutilus | 107.15 ± 61.32 | 126.05 ± 73.02 | ns | 90.27 ± 56.46 | 74.25 ± 4.13 | ns | 91.39 ± 45.12 | 91.05 ± 43.5 | ns |
S. lucioperca | 184.67 ± 125.37 | 450 | ns | 360 | 305 | ns | 305 ± 49.5 | 413 | ns |
S. erythrophthalmus | 265 | - | ns | - | - | ns | 260 | - | ns |
S. glanis | - | - | ns | - | - | ns | - | - | ns |
SP1 | SBD | SBS | |||||||
Species | Inshore | Offshore | p | Inshore | Offshore | p | Inshore | Offshore | p |
A. brama | 340 | - | ns | 80 ± 7.07 | 92 ± 12.53 | ns | 97.33 ± 11.02 | - | ns |
A. alburnus | 114.12 ± 17.26 | 110.25 ± 17.23 | ns | 104 ± 8.61 | 113.42 ± 11.96 | ns | 107.51 ± 16.37 | 110.73 ± 14.65 | ns |
G. cernua | - | - | ns | 63.75 ± 12.07 | 65.35 ± 16.62 | ns | 61.76 ± 7.08 | 64.88 ± 7.6 | ns |
L. aspius | 245.86 ± 94.84 | 140 | ns | - | - | ns | 225.5 ± 129.71 | 153.8 ± 7.69 | ns |
P. fluviatilis | 256.67 ± 23.09 | 123 ± 84.01 | ns | 105.53 ± 61.03 | 102.24 ± 63.86 | ns | 103.26 ± 67.86 | 96.32 ± 54.27 | ns |
R. rutilus | 91 ± 27.48 | 83.09 ± 31.45 | ns | 96.77 ± 34.98 | 96.49 ± 43.62 | ns | 84.57 ± 22.1 | 83.36 ± 24.64 | ns |
S. lucioperca | 230 | - | ns | - | - | ns | 460 | 167.5 ± 3.54 | ns |
S. erythrophthalmus | - | 188.75 ± 66.88 | ns | - | - | ns | 220 | - | ns |
S. glanis | - | - | ns | 290 | 210 ± 56.57 | ns | 115 | - | ns |
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Moraes, K.; Souza, A.T.; Vašek, M.; Říha, M.; Kubečka, J. Detailed Insight into Gillnet Catches: Fish Directivity and Micro Distribution. Water 2024, 16, 2683. https://doi.org/10.3390/w16182683
Moraes K, Souza AT, Vašek M, Říha M, Kubečka J. Detailed Insight into Gillnet Catches: Fish Directivity and Micro Distribution. Water. 2024; 16(18):2683. https://doi.org/10.3390/w16182683
Chicago/Turabian StyleMoraes, Karlos, Allan T. Souza, Mojmír Vašek, Milan Říha, and Jan Kubečka. 2024. "Detailed Insight into Gillnet Catches: Fish Directivity and Micro Distribution" Water 16, no. 18: 2683. https://doi.org/10.3390/w16182683