KEY WORDS: Veined rapa whelk, Rapana venosa, Alexandrium monilatum, goniodomin A, Chesapeake Bay, toxicity INTRODUCTION They prefer … The veined rapa whelk (Rapana venosa) is a big carnivorous sea snail with a gorgeous heavy shell that, to many Bulgarians, is the trademark Black Sea souvenir. THE CRIMES: Serious predator of bivalve mollusks including oysters, hard clams, razor clams, and mussels. The information is focused to answer the question: "How many hard clams could a rapa whelk eat in one year?" The native habitat of these whelks includes waters in the western Pacific Ocean including the Sea of Japan, Yellow Sea, East China Sea, and the Bohai Sea. Veined rapa whelks eat commercially valuable oysters and hard clams. Whelk egg cases may be used as a “fishermen’s soap.” The veined rapa whelk is a non-indigenous species that have been introduced into the U.S. It's called a sea snail, or the veined rapa whelk. The symptoms displayed by the rapa whelks in the 24-48 h prior to death were indicative of paralysis and followed a similar time course documented for other molluscs exposed to toxic A. monilatum. Well, they’d be surprised to find out that the curious sea creature they call rapan (рапан) is in fact an invasive species native to the Pacific waters of Far East Asia! The presence of a new or introduced species disrupts ... Veined rapa whelk Channeled whelk Knobbed whelk Exterior color Pale brown to very dark brown with visible black horizontal stripes or veins The veined rapa whelk R. venosa (Valenciennes, 1846), the turnip shell Rapana rapiformis (Born, 1778), the bezoar rapa whelk Rapana bezoar (Linnaeus, 1758), and the indo-Pacific species Rapana bulbosa (Solander, 1817) (Glayzer et al., 1984). Competes with native carnivorous snails (gastropods) such as the channelled whelk and the knobbed whelk for food; poses significant threat to native and commercially-grown shellfish.. It is attached as a PDF file that includes a data based activity, student worksheets, and teacher answer keys. Ecology: Veined rapa whelks are carnivorous gastropods whose main diet consists of a variety of other mollusk species such as native oysters. They have probably traveled in the larval stage in ships' ballast water. These predatory snails eat ecologically and economically important shellfish that are native to the bay. In this lesson, students will learn about invasive species and predict where the invasive rapa whelk will live within the bay. Rapa whelk eat their prey by wrapping their bodies around clam or oyster shells, squeezing them open, then eating the meat inside. Veined Rapa Whelk [Rapana venosa] Native to the East China Sea and Sea of Japan, these large Asian whelks are now distributed worldwide as an invasive species. No known hybrids or varieties of R. venosa exist in the literature. 2. Most snails feed by drilling a hole into their prey, but rapa whelks smother their prey by wrapping around the hinged region of … The veined rapa whelk is an invader in Chesapeake waters. Its scientific name is Rapana venosa.
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