Ribeiro M M, Oliveira J B, Boehs G
Departamento de Ciências Biológicas, Universidade Estadual de Santa Cruz, Ilhéus, BA, Brazil.
Braz J Biol. 2018 Feb;78(1):94-97. doi: 10.1590/1519-6984.07116. Epub 2017 Jun 12.
Lucina pectinata is an important economic resource in the Brazilian coast. This study reports parasitism caused by a Digenea in this species. The specimens (n = 470) were collected in December 2012 in a mangrove swamp of the Cachoeira River estuary, Bahia, Brazil. They were measured along the anterior-posterior axis (length), and after macroscopic analysis for parasites and diseases cuts of 5 mm were fixated in Carnoy's solution and processed by routine histology technique wherein sessions of 7 μm were stained with Harris hematoxylin and eosin (H&E). The tissues were examined using an optical microscope. The mean length of L. pectinata was 4.0 ± 0.53 cm. Microscopic analysis showed sporocysts containing both germ balls as cercariae of an unidentified Digenea (Platyhelminthes), these in various stages of development. The prevalence was 1.48% (7/470). In a parasitized specimen was macroscopic evidence of tissue densification of gills. The sporocysts were observed in mantle, gills, digestive gland and gonads, with evident alteration/destruction of tissues, including parasitic castration. There were no other parasites found, which is probably related to inaccessibility and chemical conditions in which lives L. pectinata, i.e., between 10 and 20 cm in mangrove sediment.
栉孔扇贝是巴西海岸一种重要的经济资源。本研究报告了该物种中一种复殖吸虫引起的寄生现象。样本（n = 470）于2012年12月在巴西巴伊亚州卡舒埃拉河河口的一片红树林沼泽中采集。沿着前后轴测量其长度，在对寄生虫和疾病进行宏观分析后，将5毫米的切片固定在卡诺伊氏液中，并采用常规组织学技术处理，其中7微米的切片用苏木精-伊红（H&E）染色。使用光学显微镜检查组织。栉孔扇贝的平均长度为4.0 ± 0.53厘米。显微镜分析显示，包蚴内含有胚球以及一种未鉴定复殖吸虫（扁形动物门）的尾蚴，处于不同发育阶段。感染率为1.48%（7/470）。在一个被寄生的样本中，鳃组织致密化有宏观证据。在内套膜、鳃、消化腺和性腺中观察到包蚴，伴有明显的组织改变/破坏，包括寄生性阉割。未发现其他寄生虫，这可能与栉孔扇贝的生存环境难以接近以及化学条件有关，即生活在红树林沉积物中10至20厘米深处。
