Abstract
The development of larvae and the growth and feeding of juveniles of the veined rapa whelk Rapana venosa, an invader in the Black Sea, has been studied in experimental conditions. With a balanced diet consisting of six microalgal species and at a water temperature of 22−23°C, the planktonic life of this gastropod lasted 22 days. The metamorphosis finished when the individuals changed their feeding behavior for the predatory type on the 25th day after the larvae emerged from the egg capsules. Cases of cannibalism have been recorded among the young individuals. The size of juvenile individuals capable of perforating bivalve shells has been clarified. One to five holes of various shapes per mussel shell could be observed. Rapa whelks bored through the thin edge of a mussel shell most often with a hole projection onto the mantle edge and most rarely with a projection onto the anterior contractile muscles of the foot. The study of the perforated holes using scanning electron microscopy has shown that individuals with a size of 20−25 mm bore mussel shells with the radula and dissolve the walls with a secretion produced by the accessory boring organ (ABO). Correlations of the mass and size values (Wtot = 0.002H2.9377, R2 = 0.9769), feeding rate (P = 0.64H2.8769, R2 = 0.9699), and perforation diameters (d = 170.78e0.1029H, R2 = 0.9403) with the gastropod shell height have been established in mussel spat shells.
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ACKNOWLEDGMENTS
The authors are grateful to Director of the Marikultura Research Organization V.D. Shenyavskii for the opportunity to perform the experiment.
Funding
This study was performed as part of a State Assignment of the Federal Research Center of the Institute of Biology of the Southern Seas on the topic “Studies of Mechanisms for Controlling Production Processes in Biotechnological Complexes to Develop Scientific Foundations for Producing Biologically Active Substances and Technical Products of Marine Genesis,” state registration no. 121030300149-0.
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Translated by D. Zabolotny
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Pirkova, A.V., Ladygina, L.V. Growth and Feeding of the Larvae and Juveniles of Rapana venosa (Gastropoda, Muricidae) in Experimental Conditions. Biol Bull Russ Acad Sci 50, 1782–1793 (2023). https://doi.org/10.1134/S1062359023080204
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DOI: https://doi.org/10.1134/S1062359023080204