| Full text | |
| Author(s): |
Simoes, Sabrina Morilhas
[1, 2]
;
D'Incao, Fernando
[3]
;
Fransozo, Adilson
[4]
;
Castilho, Antonio Leao
[4]
;
da Costa, Rogerio Caetano
[1, 2]
Total Authors: 5
|
| Affiliation: | [1] UNESP, Fac Ciencias, Dept Ciencias Biol, LABCAM Lab Biol Camaroes Marinhos & Agua Doce, BR-17033360 Bauru, SP - Brazil
[2] UNESP, IBB, AC Zool, BR-18618000 Botucatu, SP - Brazil
[3] Univ Fed Rio Grande, FURG, Dept Oceanog, Lab Crustaceos Decapodos, BR-96201900 Rio Grande, RS - Brazil
[4] UNESP, Inst Biociencias, Dept Zool, BR-18618000 Botucatu, SP - Brazil
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | JOURNAL OF CRUSTACEAN BIOLOGY; v. 33, n. 1, p. 1-9, JAN 2013. |
| Web of Science Citations: | 14 |
| 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 infinity = 19.33 mm, k = 0.02 and t(0) = -0.12 days for females and TL infinity = 15.13 mm, k = 0.03 and t(0) = -0.07 days for males, where TL infinity, is the asymptotic length, k is coefficient of growth and to 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. (AU) | |
| FAPESP's process: | 09/54672-4 - Reproductive biology and dynamic population of the Penaeoidean shrimps (Crustacea, Decapoda) from southeastern Brazilian coast: latitudinal effect and suggestion for fishery control |
| Grantee: | Rogério Caetano da Costa |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 10/50188-8 - Decapod crustaceans: multi-disciplinary characterization of the sea biodiversity of the State of São Paulo (taxonomy, spermiotaxonomy, molecular biology and population dynamics) |
| Grantee: | Fernando Luis Medina Mantelatto |
| Support Opportunities: | BIOTA-FAPESP Program - Thematic Grants |