Show simple item record Simões, Sabrina Morilhas D'Incao, Fernando Fransozo, Adilson Castilho, Antonio Leão Costa, Rogério Caetano da 2015-12-24T14:08:49Z 2015-12-24T14:08:49Z 2013
dc.identifier.citation SIMÕES, Sabrina Morilhas et al. Sex ratio, growth and recruitment of the pelagic shrimp Acetes americanus on the southeastern coast of Brazil. Journal of Crustacean Biology, v. 33, n. 1, p. 1-9, 2013. Disponível em: <>. Acesso em: 14 nov. 2015. pt_BR
dc.identifier.issn 0278-0372
dc.description.abstract We evaluated the population dynamics of Acetes americanus Ortmann, 1893 focusing on sex ratio, individual growth, longevity, and the juvenile recruitment period. Samples were collected monthly from January 2006 to June 2007 in the bay of Ubatuba, Brazil. Specimen growth was identified for each gender, and the chosen cohorts were fitted in a von Bertalanffy Growth Model (VBGM); longevity was estimated by the von Bertalanffy inverse equation, considering 99% of the asymptotic length. A total of 6881 individuals (2343 males and 4538 females) were captured. On average the body size (total length) was greater in females (14.64 ± 3.34 mm) than in males (12.27 ± 1.86 mm). The mean growth curves (obtained by grouping the cohorts for each sex), provided estimates of TL∞ = 19.33 mm, k = 0.02 and t0 = −0.12 days for females and TL∞ = 15.13 mm, k = 0.03 and t0 = −0.07 days for males, where TL∞ is the asymptotic length, k is coefficient of growth and t0 is the theorical age when the size is equal to 0. Longevity was estimated at 0.61 years for females and 0.50 years for males. The sex ratio tended to favor females, which corroborates with others studies of sergestids. Our finding that males of A. americanus have higher values of k and therefore achieve a smaller size relative to females has been observed in other penaeids. We concluded that this differential growth pattern between the sexes is found across Dendrobranchiata. The life cycles of penaeids have an average duration of approximately 1-2 years, but our results corroborate other studies that estimate a shorter longevity for Acetes, as species of this genus are typically smaller in size. We found continuous recruitment with two main peaks observed during the study period, corroborating previous studies of Acetes pt_BR
dc.language.iso eng pt_BR
dc.rights open access pt_BR
dc.subject Acetes americanus pt_BR
dc.subject Dendrobranchiata pt_BR
dc.subject Longevity pt_BR
dc.subject Population dynamics pt_BR
dc.subject Sergestidae pt_BR
dc.title Sex ratio, growth and recruitment of the pelagic shrimp Acetes americanus on the southeastern coast of Brazil pt_BR
dc.type article pt_BR
dc.identifier.doi 10.1163/1937240X-00002108 pt_BR

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