Growth rhythms in the shrimp Penaeus vannamei and P. schmitti

摘要: Growth increments of the penaeid shrimp Penaeus vannamel (Boone) and P. schmitti (Burkenroad) grown in commercial production ponds Ecuador Colombia were measured over a 4 mo period between October 1987 January 1988. from wild caught seed Ecuadorian exhibited growth rhythm which significantly coincided with lunar phases. at least 1 gwk-1 occurred around new full moon, while less than during first last quarters. transported as nauplii, raised Colombian hatcheries on cyclic pattern wet weight but not correlation to cycles was observed. showed no growth. The two species under consideration are indigenous different, quite unique areas displaying different environmental characteristics. link pattern, biological is discussed.