Waiho Khor, Fazhan Hanafiah, Glenner Henrik, Ikhwanuddin Mhd
Institute of Tropical Aquaculture, Universiti Malaysia Terengganu, Kuala Terengganu, Terengganu, Malaysia.
Marine Biology Institute (MBI), Shantou University, Shantou, Guangdong, China.
PeerJ. 2017 Jun 30;5:e3419. doi: 10.7717/peerj.3419. eCollection 2017.
Screening of mud crab genus was conducted in four locations (Marudu Bay, Lundu, Taiping, Setiu) representing Malaysia. with abnormal primary and secondary sexual characters were prevalent (approximately 42.27% of the local screened population) in Marudu Bay, Sabah. A total of six different types of abnormalities were described. Crabs with type 1 and type 3 were immature males, type 2 and type 4 were mature males, type 5 were immature females and type 6 were mature females. The abdomen of all crabs with abnormalities were dented on both sides along the abdomen's middle line. Abnormal crabs showed significant variation in their size, weight, abdomen width and/or gonopod or pleopod length compared to normal individuals. The mean body weight of abnormal crabs (type 1-5) were higher than normal crabs with smaller body size, while females with type 6 abnormality were always heavier than the normal counterparts at any given size. Sacculinid's externa were observed in the abdomen of crabs with type 4 and type 6 abnormalities. The presence of embryos within the externa and subsequent molecular analysis of partial mitochondrial COI region confirmed the rhizocephalan parasite as . Future in-depth descriptions of the life cycle and characteristics of are recommended as it involves a commercially important edible crab species and the effect on human health from the consumption of crabs is of crucial concern.
在代表马来西亚的四个地点（马鲁杜湾、伦都、太平、塞蒂乌）对泥蟹属进行了筛查。在沙巴州的马鲁杜湾，具有异常初级和次级性征的蟹很普遍（约占当地筛查种群的42.27%）。共描述了六种不同类型的异常情况。1型和3型蟹为未成熟雄性，2型和4型蟹为成熟雄性，5型蟹为未成熟雌性，6型蟹为成熟雌性。所有异常蟹的腹部沿腹部中线两侧均有凹陷。与正常个体相比，异常蟹在大小、重量、腹部宽度和/或交接器或腹肢长度方面表现出显著差异。异常蟹（1 - 5型）的平均体重高于体型较小的正常蟹，而6型异常的雌性蟹在任何给定大小下总是比正常同类更重。在4型和6型异常蟹的腹部观察到了蟹奴的外部结构。外部结构内胚胎的存在以及随后对线粒体COI区域部分的分子分析证实了根头类寄生虫为[具体寄生虫名称未给出]。建议未来对[具体寄生虫名称未给出]的生命周期和特征进行深入描述，因为它涉及一种具有商业重要性的食用蟹种，并且食用蟹对人类健康的影响至关重要。
