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Feeding intensity and daily mussel consumption of Rapa whelk (Rapana venosa) in the north-western Black Sea

Svitlana Stadnichenko
Svitlana Stadnichenko
 y 
Aleksandr Kurakin
Aleksandr Kurakin
   | 18 ene 2023
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Article Category: Original research paper
Publicado en línea: 18 ene 2023
Páginas: 344 - 354
Recibido: 23 ago 2022
Aceptado: 14 nov 2022
DOI: https://doi.org/10.26881/oahs-2022.4.04
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© 2022 Svitlana Stadnichenko et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1

Placement of the experimental cages with Rapa whelks and mussels in the coastal waters of the Snake Island (photo by A.P. Kurakin)
Placement of the experimental cages with Rapa whelks and mussels in the coastal waters of the Snake Island (photo by A.P. Kurakin)

Figure 2

Location of the experimental site near Snake Island, north-western Black Sea (45°15′08.2″N; 30°12′09.8″E)
Location of the experimental site near Snake Island, north-western Black Sea (45°15′08.2″N; 30°12′09.8″E)

Figure 3

Dependence of the feeding intensity on the shell height of Rapana venosa in the experiment
Dependence of the feeding intensity on the shell height of Rapana venosa in the experiment

Morphometric characteristics of Rapana venosa used in experimental cages (Snake Island, north-western Black Sea, Ukraine)

N Size class, mm n Shell height (SH), mm Total mass (WR), g
min. − max SH means ± SE min. – max WR means ± SE
1 30–40 20 34.5–44.7 40.7* ± 0.56 6.17–13.69 10.19 ± 0.44
2 41–50 18 42.1–50.4 46.48 ± 0.51 14.15–25.48 18.46 ± 0.77
3 60–70 10 61.3–67.0 64.44 ± 0.64 41.93–63.20 53.13 ± 2.28
4 80–90 10 80.6–85.1 83.46 ± 0.43 100.33–136.31 118.33 ± 3.69

Quantity (in %) of mussels consumed, by shell size

Mussels shell length (mm) Shell height of Rapana venosa (mm)
30–40 41–50 60–70 80–90
0–10 5.7 – – –
10–20 10.76 10.20 6.57 3.73
20–30 63.29 61.22 41.61 20.90
30–40 14.56 19.73 32.85 31.34
40–50 5.06 6.12 14.60 32.09
50–60 0.63 2.72 4.38 11.94
Number of mussels eaten 158 147 137 134
total 468 666 573 560

Regression coefficients of the size/mass ratio for mussels near Snake Island, based on feeding experiments in the north-western Black Sea

Regression Parameters SE a SE b R2 (%)
a b
lnW=a+blnL –8.955 2.917 0.093 0.027 99.8
lnWw=a+blnL –10.588 2.905 0.180 0.050 99.3
lnWst=a+blnL –9.345 2.782 0.119 0.034 99.7

Size and mass characteristics of the Mediterranean mussel (Mytilus galloprovincialis) consumed in experiment (Snake Island, north-western Black Sea, Ukraine

Parameters Shell height (SH) Rapana venosa, mm
30–40 40–50 60–70 80–90
Lmussel, mm min.–maxm ± SE 2.6–52.525.58 ± 0.69 12.3–58.328.20 ± 0.68 14.1–51.931.62 ± 0.75 17.9–59.638.12 ± 0.84
WM.gal, g min.–maxm ± SE 0.002–13.432.169 ± 0.169 0.194–18.2372.764 ± 0.234 0.29–12.9913.731 ± 0.257 0.582 –19.4406.225 ± 0.350
WwM.gal, g min.–maxm ± SE 0.001–2.5090.407 ± 0.031 0.037–3.4020.518 ± 0.043 0.055–2.4270.699 ± 0.048 0.110–3.6271.165 ± 0.065
WsM.gal, g min.–maxm ± SE 0.001–5.3210.920 ± 0.06 0.094–7.1231.16 ± 0.092 0.137–5.1541.549 ± 0.102 0.267–7.5732.531 ± 0.137
Mussel shell mass(MSM), g ind−1 per day−1 0.428 0.557 1.248 1.995
Feeding intensity(FI), mg g−1 per day−1 99 72 57 41
Daily ration(DR), g ind−1 per day−1 0.189 0.249 0.563 0.917

Morphometric characteristics of the Mediterranean mussels (Mytilus galloprovincialis) used in the experimental cages (Snake Island, north-western Black Sea, Ukraine)

N n Length (L), mm Total mass (Wmussel), g
min.–max L means ± SE min.–max Wmussel means ± SE
1 468 2.6–62.8 24.85 ± 0.41 0.002–22.67 2.09 ± 0.106
2 666 5.3–60.0 24.96 ± 0.33 0.017–19.85 2.07 ± 0.091
3 573 5.1–53.3 26.60 ± 0.40 0.015–14.05 2.55 ± 0.114
4 560 6.2–60.5 28.49 ± 0.49 0.026–20.34 3.378 ± 0.153
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