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Demography of the Agassiz's parrotfish Sparisoma frondosum (Agassiz, 1831) in north-eastern Brazil

Published online by Cambridge University Press:  08 July 2015

Rosângela Lessa*
Affiliation:
Departamento de Pesca e Aqüicultura (DEPAq), Universidade Federal Rural de Pernambuco (UFRPE), Dois Irmãos, 52171-900 Recife, PE, Brazil Programa de Pós-Graduação em Biologia Animal, Universidade Federal de Pernambuco (UFPE), Cidade Universitária, Recife, PE, Brazil
Camila R. Da Silva
Affiliation:
Programa de Pós-Graduação em Biologia Animal, Universidade Federal de Pernambuco (UFPE), Cidade Universitária, Recife, PE, Brazil
June F. Dias
Affiliation:
Instituto Oceanográfico (IO), Universidade de São Paulo (USP), Praça do Oceanográfico, 191, 05508-120 São Paulo, SP, Brazil
Francisco M. Santana
Affiliation:
Unidade Acadêmica de Serra Talhada (UAST), Universidade Federal Rural de Pernambuco (UFRPE), Serra Talhada, 56903-970 PE, Brazil
*
Correspondence should be addressed to:R. Lessa, Departamento de Pesca e Aqüicultura (DEPAq), Universidade Federal Rural de Pernambuco (UFRPE), Dois Irmãos, 52171-900 Recife, PE, Brazil email: [email protected]

Abstract

Age and growth of Agassiz's parrotfish Sparisoma frondosum captured off Brazil (Pernambuco) were estimated using sagittal otoliths from 251 specimens. Sex of each specimen was determined and showed that 130 specimens were females (13.1 to 36.8 cm TL) and 121 were males (17.5 to 36.6 cm TL). The otolith marginal increment analysis indicated a single translucent ring formed every year. Parameters of growth curves were derived for the von Bertalanffy (VBGF) and Gompertz models. Based on the Akaike information criterion (AIC), both models were suitable for describing the growth of this species. VBGF parameters were estimated for males L = 39.74 cm TL, K = 0.22, t 0 = −1.63 years, females L = 32.38 cm TL, K = 0.44; t 0 = −0.23 years; and for the sexes combined L = 33.66 cm TL, K = 0.41, t 0 = −0.27 years. The study showed that 55% of individuals were 3 and 4 years of age, with maximal age of 9 years. Mature females (>17.6 cm TL) accounted for 45% of the sample. The age at first maturity for females was 1.6 years. For males the size at first maturity was not determined as immature individuals were not present in the overall sample. Also, primary males (PM) and specimens with gonads undergoing sexual transition were not found. The age structure and growth parameters for S. frondosum are an important contribution to the assessment of the state of exploitation of this species.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2015 

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