The development rate of the salmon louse Lepeophtheirus salmonis is greatly influenced by seawater temperature. This study describes how the growth rate of L. salmonis changes with temperature and identifies the extreme high and low temperatures at which development to the adult stage is compromised. Atlantic salmon Salmo salar were infected with copepodids and development was monitored in 8 temperature groups spanning 3 to 24°C until the lice were adults. Development was severely compromised at 3 and 24°C, while the lice developed normally in the temperature range from 6 to 21°C. At 6°C, most female lice had become adults at 72 d post infection (432 degree-days). At 21°C, development was significantly faster and most females were adults after 13 d, at only 271 degree-days. After infection, lice grew through 5 stages before reaching the adult stage, all of which, with a few exceptions, appeared to last approximately equally long. Thus, a simple model describing the mean daily growth rate (stages per day) as a function of temperature was made for each sex. The relationship between mean daily growth rate and temperature was best described by a second-order polynomial. The term relative age is introduced and used to describe the pattern of development in terms of percent of total development time to the adult stage. This was applied to calculate the timing of developmental events as a function of temperature. Photoperiod and development under rising or decreasing temperatures had minor effects on development rate.

中文翻译：

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在 3 至 24 °C 的温度范围内，鲑鱼虱 Lepeophtheirus Salmonis 寄生阶段的发育

鲑鱼 Lepeophtheirus salanis 的发育速度受海水温度的影响很大。这项研究描述了鲑鱼的生长速度如何随温度变化，并确定了发育到成虫阶段受到影响的极端高温和低温。大西洋鲑鱼 Salmo salar 被桡足类感染，并在 3 到 24°C 的 8 个温度组中监测发育，直到虱子成年。在 3°C 和 24°C 时发育严重受损，而虱子在 6 至 21°C 的温度范围内正常发育。在 6°C 时，大多数雌性虱子在感染后 72 天（432 度-日）已成虫。在 21°C 时，发育明显更快，大多数雌性在 13 d 后成年，仅在 271 度日。感染后，虱子在达到成虫阶段之前经历了 5 个阶段，所有这些阶段，除了少数例外，似乎持续时间大致相同。因此，为每个性别制作了一个简单的模型，描述了作为温度函数的平均日增长率（每天的阶段）。平均日增长率和温度之间的关系最好用二阶多项式来描述。引入了术语相对年龄，并用于描述发育模式，即到成年阶段的总发育时间的百分比。这被用于计算作为温度函数的发育事件的时间。温度升高或降低下的光周期和显影对显影速率的影响较小。为每个性别制作了一个简单的模型，描述了作为温度函数的平均日增长率（每天的阶段）。平均日增长率和温度之间的关系最好用二阶多项式来描述。引入了术语相对年龄，并用于描述发育模式，即到成年阶段的总发育时间的百分比。这被用于计算作为温度函数的发育事件的时间。温度升高或降低下的光周期和显影对显影速率的影响较小。为每个性别制作了一个简单的模型，描述了作为温度函数的平均日增长率（每天的阶段）。平均日增长率和温度之间的关系最好用二阶多项式来描述。引入了术语相对年龄，并用于描述发育模式，即到成年阶段的总发育时间的百分比。这被用于计算作为温度函数的发育事件的时间。温度升高或降低下的光周期和显影对显影速率的影响较小。引入了术语相对年龄，并用于描述发育模式，即到成年阶段的总发育时间的百分比。这被用于计算作为温度函数的发育事件的时间。温度升高或降低下的光周期和显影对显影速率的影响较小。引入了术语相对年龄，并用于描述发育模式，即到成年阶段的总发育时间的百分比。这被用于计算作为温度函数的发育事件的时间。温度升高或降低下的光周期和显影对显影速率的影响较小。