Abstract

The reproduction, growth, and variability of the shape of the shell in the gastropod Boreotrophon candelabrum (Reeve, 1848) from Peter the Great Bay (Sea of Japan) were investigated. In aquarium conditions, the mollusks started to lay transparent hemispherical egg capsules in late April at a water temperature of 5.6°C. The females with a shell height of 38–51 mm laid 13–46 egg capsules. The diameter of the base of the egg capsules ranged from 6.0 to 10.1 mm. Each capsule contained from 411 to 1710 eggs with a diameter of 0.204 ± 0.024 mm. In nature, egg capsules appeared in the first half of May and were commonly found from May to the first half of June; a few may be encountered until September. The release of the larvae from the egg capsules into the sea occurred from the second half of May. Mollusks grew most intensively in the first 2 years of life and reached a shell height of approximately 35 mm. The annual shell growth then decreased and at the age of 6 years the mollusks almost attained the maximum size observed in nature. This was calculated by the von Bertalanffy equation: L_t = 61.2 [1 – e^{–0.5572 (t – 0.4672)}]. The shape of the shell of B. candelabrum significantly varied depending on habitat conditions. The habitat given in the species description [3] was only observed for 17% of the population in the bay.

中文翻译：

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来自日本海彼得大帝湾的腹足类番茄的生长，繁殖和壳形的特殊性（里夫，1848年）（M科）

摘要

腹足动物Broeotrophon candelabrum中壳的形状的繁殖，生长和变异性彼得大帝湾（日本海）（里夫，1848年）得到了调查。在水族箱条件下，软体动物于4月下旬在水温5.6°C下开始放置透明的半球形卵囊。壳高38–51毫米的雌性产下13–46个卵囊。卵囊底部的直径范围为6.0至10.1 mm。每个胶囊包含411到1710个卵，直径为0.204±0.024毫米。在自然界中，卵囊出现在5月上半月，通常是从5月到6月上半月发现的；直到九月可能会遇到一些。从5月下半月开始，幼虫从卵囊中释放出来。软体动物在生命的头2年中生长最快，并达到约35毫米的壳高。然后，壳的年生长减少，并且在6岁时，软体动物几乎达到了自然界中观察到的最大大小。这是通过von Bertalanffy方程计算的：L _t = 61.2 [1 – e ^{–0.5572（t – 0.4672）} ]。B. candelabrum壳的形状根据栖息地条件而有很大不同。物种描述[3]中给出的栖息地仅在海湾中观察到了17％的人口。