Tumor-like formations on the shells of Japanese scallops Patinopecten yessoensis (Jay) |
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Authors: | AV Silina |
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Institution: | (1) Institute of Marine Biology, Far East Branch, Russian Academy of Sciences, Palchevskogo Street 17, 690041 Vladivostok, Russia |
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Abstract: | Three types of tumor-like formations on the shell of commercial Japanese scallop Patinopecten
(= Mizuhopecten) yessoensis were identified. The first type of tumor-like formation (Type I) is a brown prominent knob on the inner shell surface. This
is the result of penetration of aggregations of the polychaete worms of genus Polydora into the scallop cavity usually through the upper valve of scallop and subsequent covering of their boreholes by shell calcite
carbonate. The second type (Type II) is tumor-like lamination of the shell with the inclusion of organic matter between calcite
layers on the inner surface of the upper and lower valves. These laminations have no outlet to the outer shell surface. The
third type of scallop shell tumor-like lesion (Type III) mainly built up on the inner surface of the lower valve. It is a
cone-shaped lump, which seemed to consist of aggregated coarse-grained sand. It has no outlet to the outer shell surface.
Tumors of the different types are not equally distributed. Type I tumors are the most common, followed by Type II and Type
III. Other kinds of tumor-like lesions on the inner shell surface are not found in the species studied. On the outer surface
of scallop shell tumor-like formations were not found. The shell tumor-like lesions occurred significantly more frequently
on scallops that are inhabiting muddy bottom sediments than sand. A positive relationship was found between scallop age and
occurrence of shell lesions. The tumor-like formations of all types adversely influence scallops. The shell height and total,
soft tissue and adductor muscle weights were lower for scallops with tumor-like formations on the shell than for healthy individuals. |
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