Growth, reproduction, and life span in Sacculina carcini Thompson (Cirripedia: Rhizocephala) in the Isefjord, Denmark

摘要: Abstract A study of major events in the life cycle Sacculina carcini parasitizing shore crabs, Carcinus maenas (L.), was undertaken at a northern boreal locality (c. 56° N). During 1979 –82, 28 388 crabs were collected fairly regularly from May to September, supplemented with smaller samples October April. Infestation ranged between 1.85 and 2.90 %, female being less often infected than males. The internal phase is calculated last least 33 –34 months. Observations field on 200 sacculinized kept under surveillance cages sea showed that externae normally break through host’s abdomen June –July. Growth does not occur until c. 1 July only if cells pelagic male cyprids are transferred externa’s receptacles. At 15 –18° C grow maturity width 14 –17.5 mm 17 –24 days. main breading season extends mid –July September/October during which up 6 batches each containi...