Centro Universitário de Mineiros, Unidade Básica de Biociências, Mineiros, GO, Brasil.
Universidade Federal de Jataí - UFJ, Unidade Acadêmica de Ciências Agrárias, Jataí, GO, Brasil.
Braz J Biol. 2021 May 10;82:e240840. doi: 10.1590/1519-6984.240840. eCollection 2021.
The aim of this study was to report the first record of Trichodina heterodentata in banded knifefish Gymnotus carapo. Banded knifefish cultivated in the municipality of Jataí, state of Goiás, in the central western region of Brazil, experienced fish mortality rates of 3-4% per tank. Macroscopic analysis found that fish had lesions on their skin and gills. Smears of the integument and gills were confectioned and air-dried at room temperature and impregnated with silver nitrate to identify the Trichodinidae species causing the lesions. The trichodinid were identified as T. heterodentata, and their characteristics were compared to those from T. heterodentata recorded from other species of host fish. It was observed that the presence of T. heterodentata was associated with inadequate fish management, low water quality, high rates of stocking density, and inadequate nutritional management.
本研究旨在报道栉口虫属 Trichodina heterodentata 在带纹刀鱼 Gymnotus carapo 中的首次记录。巴西中西部戈亚斯州 Jataí 市养殖的带纹刀鱼，每缸的死亡率为 3-4%。宏观分析发现，鱼的皮肤和鳃上有病变。制作了皮肤和鳃的抹片，并在室温下风干，然后用硝酸银浸渍以鉴定引起病变的 Trichodinidae 物种。这些 Trichodinidae 被鉴定为 T. heterodentata，并将其特征与从其他宿主鱼类记录的 T. heterodentata 进行了比较。观察到 T. heterodentata 的存在与鱼类管理不善、水质差、放养密度高以及营养管理不当有关。
