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