Salazar Vanessa, Koch Jeff D, Neely Ben C, Steffen Christopher J, Flores Ernesto, Steffen Susan F
Kansas Department of Wildlife, Parks, and Tourism, Emporia, Kansas, 66801, USA.
J Aquat Anim Health. 2022 Mar;34(1):38-44. doi: 10.1002/aah.10147. Epub 2022 Jan 21.
Largemouth Bass virus (LMBV) first became a concern in Kansas when it was identified as a potential cause of decreased catch rates at Crawford State Fishing Lake in 2007. The discovery of LMBV in eight additional impoundments from 2008 to 2017 increased concern about the prevalence and effects of LMBV in Kansas. In response, the Kansas Department of Wildlife, Parks, and Tourism tested 25 Largemouth Bass Micropterus salmoides impoundments for the presence of LMBV. The objectives of this study were to quantify the incidence of LMBV and examine differences in population metrics (i.e., body condition, relative abundance, and growth). A total of 1,260 Largemouth Bass were collected by using standard spring electrofishing surveys, and sagittal otoliths were collected from all of the sampled fish to estimate growth rates. Of the 25 study impoundments, 14 tested positive for LMBV. There was no evidence of LMBV effects on body condition, relative abundance of quality-length fish, or growth rates. The initial dates of LMBV infection of Largemouth Bass in these impoundments are unknown. The LMBV-positive populations in Kansas may have been exposed to the virus many years ago, and the fish may be in the process of rebounding from any potential negative effects.
大口黑鲈病毒（LMBV）于2007年在堪萨斯州首次引起关注，当时它被确定为克劳福德州立钓鱼湖捕获率下降的一个潜在原因。2008年至2017年期间，在另外8个蓄水设施中发现了LMBV，这增加了人们对LMBV在堪萨斯州的流行情况及其影响的担忧。作为回应，堪萨斯野生动物、公园和旅游部对25个大口黑鲈（Micropterus salmoides）蓄水设施进行了LMBV检测。本研究的目的是量化LMBV的发病率，并检查种群指标（即身体状况、相对丰度和生长）的差异。通过标准的春季电捕鱼调查共收集了1260条大口黑鲈，并从所有采样鱼中采集矢耳石以估计生长率。在25个研究蓄水设施中，有14个LMBV检测呈阳性。没有证据表明LMBV对身体状况、优质长度鱼类的相对丰度或生长率有影响。这些蓄水设施中大口黑鲈感染LMBV的初始日期未知。堪萨斯州LMBV呈阳性的种群可能多年前就已接触到该病毒，鱼类可能正在从任何潜在的负面影响中恢复。
