ABSTRACT: An unusually high mortality rate due to verminous (Philometra rubra) coelomitis was documented in wild-hatched striped bass Morone saxatilis raised in a fish hatchery as part of a stock restoration program. To decrease the parasitic burden and therefore potentially minimize mortality, the effectiveness of 2 different anthelmintics was evaluated. Two trials were conducted on wild-collected fingerlings naturally infected by P. rubra. In 2006, 144 yearling fish were randomly assigned to 4 experimental groups: (1) levamisole (Levasol®) at 2 mg l^-1 via immersion for 8 h once weekly for 3 wk; (2) levamisole at a dose of 2.5 mg kg^-1 biomass via feed once daily for 7 d; (3) emamectin benzoate (Slice®) at a dose of 0.05 mg kg^-1 biomass via feed once daily for 7 d; and (4) control. Emamectin successfully eliminated live nematodes in 84.9% of the fish, whereas the administration of levamisole, either via immersion or feed, was not successful in significantly reducing the number of live P. rubra. In 2007, the administration of the same dosage of emamectin to approximately 1000 naturally infected yearling striped bass was associated with a 100% mortality rate of P. rubra in the 30 fish randomly examined 5 wk after the beginning of the treatment. Results of these trials indicate that, at the dosage used, the administration of emamectin at the end of the summer is safe for striped bass yearlings and considerably reduces the prevalence and intensity of the infection by this parasite.

中文翻译：

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Emamectin benzoate是一种安全有效的驱虫剂，可预防条纹鲈Morone saxatilis中的空肠线虫Philometra rubra

摘要：作为鱼类种群恢复计划的一部分，在鱼类孵化场饲养的野生孵化条纹鲈鱼Morone saxatilis中记录了由于蠕虫（Philometra rubra）蠕虫引起的极高死亡率。为了减少寄生虫负担并因此潜在地降低死亡率，评估了两种不同驱虫药的有效性。对自然感染了红杨假单胞菌的野生鱼种进行了两项试验。2006年，将144只一岁鱼随机分为4个实验组：（1）左旋咪唑（Levasol®）以2 mg l ^-1的浓度每周浸入8小时，每周3 wk；（2）左旋咪唑的剂量为2.5 mg kg ^-1每天一次通过饲料进料7 d；（3）每天一次喂食，剂量为0.05 mg kg ^-1生物量的苯甲依巴菌素（Slice®），持续7 d；（4）控制。Emamectin成功消除了84.9％的鱼中的活线虫，而通过浸没或饲料投予左旋咪唑并不能显着减少活红假单胞菌的数量。在2007年，对大约1000种自然感染的一岁条纹鲈鱼给予相同剂量的Emamectin，可使红假单胞菌的死亡率达到100％在开始治疗后5周内随机检查的30条鱼中。这些试验的结果表明，在夏季结束时，依阿莫菌素按剂量使用对条纹鲈鱼一岁是安全的，并大大降低了这种寄生虫的感染率和感染强度。