Abstract
The life history of Neomysis mirabilis was studied in Notoro Lagoon, north-eastern Hokkaido, Japan from April 2006 to November 2006. Cohort analysis revealed that this species was composed of five assemblages over the course of a year. By comparing life history traits such as growth rate, mature size and brood size of each group, it was revealed that N. mirabilis was consisted of three generations, wintering-, spring- and summer generations, in Notoro Lagoon. These three generations had different growth rate, mean maximum carapace length, mature size and brood size. Maximum CLs were inversely correlated to the seawater temperatures they experienced, which was coincident to the well-known temperature-size rule. These seasonal changes in the life history traits could affect abundance, behavior and distribution of the other organisms particularly on possible predators in the lagoon.
