Lackenby Julia A, Chambers Clinton B, Ernst Ingo, Whittington Ian D
School of Earth and Environmental Sciences, Darling Building (DP418), University of Adelaide, North Terrace, South Australia 5005, Australia.
Dis Aquat Organ. 2007 Mar 13;74(3):235-42. doi: 10.3354/dao074235.
The monogenean Benedenia seriolae (Yamaguti, 1934) Meserve, 1938 is a major pathogen of farmed yellowtail kingfish Seriola lalandi in South Australia. To control parasite populations in commercial farms, an understanding of the effect of water temperature on parasite development is vital. This study investigated the effect of water temperature (14, 18, 22 and 26 +/- 0.5 degrees C) on development, growth rates and age at sexual maturity of B. seriolae. Five distinct developmental stages, defined by the progressive development of reproductive organs, were used to describe development of B. seriolae from recently invaded larvae to sexually mature adults. Parasite age at the first sign of sexual maturity (ability to lay eggs) was strongly influenced by water temperature and was attained at 41, 24, 16 and 14 d post infection (p.i.) at 14, 18, 22 and 26 +/- 0.5 degrees C respectively. Four parameters (parasite total length, maximum parasite width, accessory sclerite length and anterior hamulus length) were examined for suitability as an index of parasite age. Growth rates for each parameter increased with water temperature; however, mean anterior hamulus length was identified as the most reliable index of parasite age. Equations derived from these data can be used to estimate parasite age and time to sexual maturity at water temperatures ranging from 14 to 26 degrees C. The equations provide a simple tool to assist implementation of strategic treatment plans for B. seriolae infections in commercial kingfish farms, not only in South Australia but in other localities worldwide where S. lalandi is farmed.
单殖吸虫塞氏本尼登虫（Yamaguti，1934年）Meserve，1938年是南澳大利亚养殖黄尾鰤（Seriola lalandi）的主要病原体。为了控制商业养殖场中的寄生虫数量，了解水温对寄生虫发育的影响至关重要。本研究调查了水温（14、18、22和26±0.5摄氏度）对塞氏本尼登虫发育、生长速率和性成熟年龄的影响。根据生殖器官的逐步发育定义了五个不同的发育阶段，用于描述塞氏本尼登虫从刚侵入的幼虫到性成熟成虫的发育过程。性成熟（产卵能力）的第一个迹象出现时的寄生虫年龄受水温影响很大，在14、18、22和26±0.5摄氏度下分别在感染后41、24、16和14天达到性成熟。研究了四个参数（寄生虫全长、最大寄生虫宽度、副硬体长度和前钩长度）作为寄生虫年龄指标的适用性。每个参数的生长速率均随水温升高而增加；然而，平均前钩长度被确定为最可靠的寄生虫年龄指标。从这些数据得出的方程可用于估计水温在14至26摄氏度范围内的寄生虫年龄和性成熟时间。这些方程提供了一个简单的工具，有助于在商业黄尾鰤养殖场实施针对塞氏本尼登虫感染的战略治疗计划，不仅适用于南澳大利亚，也适用于全球其他养殖黄尾鰤的地区。
