Young Joy M, Frasca Salvatore, Gruber Samuel H, Benz George W
Department of Biological Sciences, Florida Atlantic University, Boca Raton, Florida 33431; * Department of Pathobiology and Veterinary Science, University of Connecticut, Storrs, Connecticut 06269-3089;
J Parasitol. 2013 Dec;99(6):1151-4. doi: 10.1645/GE-3250.1. Epub 2013 Jun 24.
Fifty lemon sharks, Negaprion brevirostris , were captured in a shallow, mangrove-fringed shark nursery at Bimini, Bahamas and examined for the presence of skin-dwelling ectoparasitic monogenoids (Monogenoidea). Sixteen sharks were infected by Dermophthirius nigrellii (Microbothriidae); the youngest host was estimated to be 3- to 4-wk-old. Infection prevalence, mean intensity, and median intensity (0.32, 2.63, and 2.0, respectively, for all sharks) were not significantly different between neonates (estimated ages 3- to 10-wk-old) and non-neonatal juveniles (estimated ages 1- to 4-yr-old), suggesting that soon after parturition lemon sharks acquire infection levels of D. nigrellii matching those of juvenile conspecifics. Monogenoids were only found on the trailing portion of the first and second dorsal fins and upper lobe of the caudal fin. The prevalence of D. nigrellii was highest on the first dorsal fin; however, the mean and median intensities of D. nigrellii were similar between fins in all but 1 case. These results raise important husbandry implications regarding the practice of preferentially seeking neonatal and other small lemon sharks for captivity.
在巴哈马群岛比米尼岛一处浅滩的、红树林环绕的鲨鱼幼鱼培育所捕获了50条柠檬鲨（学名：Negaprion brevirostris），并检查其体表是否存在寄生的单殖吸虫（单殖亚纲）。16条鲨鱼感染了黑皮鳃吸虫（微双盘科）；最年幼的宿主估计为3至4周龄。新生鲨鱼（估计年龄3至10周）和非新生幼鲨（估计年龄1至4岁）之间的感染率、平均感染强度和中位数感染强度（所有鲨鱼分别为0.32、2.63和2.0）没有显著差异，这表明柠檬鲨在分娩后不久感染黑皮鳃吸虫的水平就与同龄幼鲨相当。单殖吸虫仅在第一和第二背鳍的后部以及尾鳍的上叶被发现。黑皮鳃吸虫在第一背鳍上的感染率最高；然而，除1例情况外，各鳍之间黑皮鳃吸虫的平均感染强度和中位数感染强度相似。这些结果对优先选择新生和其他小柠檬鲨进行圈养的做法提出了重要的饲养管理问题。
