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Master's Dissertation
DOI
10.11606/D.21.2013.tde-29052014-145602
Document
Author
Full name
Thiago José Balbi
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2013
Supervisor
Committee
Wongtschowski, Carmen Lucia Del Bianco Rossi (President)
Silva, Antonio Olinto Avila da
Martins, Rodrigo Silvestre
Title in Portuguese
Idade e crescimento da abrótea-de-profundidade - Urophycis mystacea Ribeiro, 1903- (Teleostei: Phycidae) na plataforma continental externa e talude do Sudeste-Sul brasileiro
Keywords in Portuguese
Urophicys mystacea
crescimento
idade
otólitos
Sudeste-Sul-Brasil
Abstract in Portuguese
Urophycis mystacea, RIBEIRO, 1903, (Phycidae; Gadiformes) é uma espécie demerso-bentônica presente na plataforma externa e no talude da região Sudeste-Sul do Brasil. Desde 2001 é alvo das pescarias em águas profundas e seu estoque vem diminuído. A idade da espécie foi analisada em exemplares com comprimentos totais (Ct) entre 187 e 632 mm, através da contagem de anéis de 201 cortes de otólitos. A periodicidade (anual) e a época de formação dos anéis (outono) foram verificadas pela porcentagem relativa do tipo de borda. U. mystacea apresenta crescimento lento e longevidade moderada. Foram encontrados machos com 1 a 6 anos e fêmeas com 1 a 12 anos. Os parâmetros de crescimento foram obtidos pelos métodos de Ford-Walford e Iterativo dos Mínimos Quadrados. As equações de crescimento mais adequadas foram: Ct = 549.16 (1-exp-0.203(t-(-0.9)) para machos e, Ct = 738.08 (1-exp-0.134(t-(-1.08)) para fêmeas. O teste "razão de máxima verossimilhança" revelou diferenças significativas entre as curvas de machos e fêmeas. A relação entre variáveis morfométricas dos otólitos e a idade foi obtida (modelo potencial) e a robustez verificada pelo valor do coeficiente de determinação (R2). O peso apresentou maior robustez para predizer a idade dos exemplares
Title in English
Age and growth of the deep-hake - Urophicys mystacea Ribeiro, 1903 - (Teleostei: Phycidae) on the outer continental shelf and slope of the Southeast-South Brazilian region
Keywords in English
Urophicys mystacea
age
growth
otoliths
Southeast and South Brazil
Abstract in English
Urophicys mystacea, RIBEIRO, 1903 (Phycidae; Gadidae) is a demersalbenthic species present on the outer shelf and the slope of the South-Southeast region of Brazil. Since 2001 it has been a target fisheries on deepwater and its stock has been decreased. The age of the species was investigated in specimens with total lengths (Lt) between 187 and 632 mm by counting the rings of 201 otoliths slices. The periodicity (annual) and the time of ring formation (autumn) were verified by the relative percentage of the edge type. U. mystacea presents slow growth and moderate longevity. Males from 1 to 6 years and females from 1 to 12 years were found. Growth parameters were obtained by the methods of Ford-Walford and Iterative Least Squares. The most appropriate growth equations were: Lt=549.16 (1-exp-0.203 (t-(-0.9)) for males and Lt=738.08 (1-exp-0.134 (t-(-1.08)) for females. The likelihood test revealed significant differences between the male and female curves. The relationship between otolith morphometric variables and age was obtained (potential model) and its robustness was verified by the coefficient of determination (R2). The weight was more robust to predict the age of the specimens
 
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Publishing Date
2014-06-04
 
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