On the vertical distribution and migration of Northern Shrimp Pandalus eous in the waters off Noto Peninsula, the sea of Japan [Japanese]

摘要

The vertical distribution and migration of the Northern Shrimp were analyzed by samples caught in different depths throughout a year. This paper clarified the life history of the Northern Shrimp together with preceding papers. The results obtained were as follows. The young shrimp move to deep bottom with growth after settling by way of larval stage. The shrimp mate mainly between males aged 3, 4 and 5 years old and females aged 6, 8 and 10 years old, and spawn eggs in March and April. The spawning area lies around 400-600 m in depth. The ovigerous shrimp gradually move to the depth of 200-300 m, and larvae hatch in January and February after an ovigerous period of about 10 months.