Oxygen consumption and ammonia excretion of the searobin Prionotus punctatus (Scorpaeniformes, Triglidae) at two different temperatures

RESEARCH ARTICLES

Oxygen consumption and ammonia excretion of the searobin Prionotus punctatus (Scorpaeniformes, Triglidae) at two different temperatures

Vicente Gomes; Phan Van Ngan; Maria José de Arruda Campos Rocha Passos; Liliana Lucia Christina Forneris

Instituto Oceanográfico da Universidade de São Paulo (Caixa Postal 66149, 05315-970 São Paulo, SP, Brasil)

ABSTRACT

Routine oxygen consumption and ammonia excretion were measured at 20ºC and 25ºC in the searobin Prionotus punctatus collected in Ubatuba region (22º30'S), SP, Brazil, in western South Atlantic, to investigate energy expenditure and losses through metabolic processes. IndividuaIs ranging from 1.00g to 88.47g and from 1.79g to 56.50g were used in experiments at 20ºC and 25ºC, respectively. At 20ºC and 25ºC, the averages of weight-specific oxygen consumption for the weight class of 1.00 - 10.00g, common to both temperatures, were 162.46µ 39.51 µ.10z/g/h and 200.47µ 92.46 µ.10z/g/h, respectively; for the weight class of 50.01 - 60.00g these values were 112.30 µ 22.84 µ.10z/g/h and 114.60 µ 20.36 µ.10zlg/h. At 20ºC and 25ºC, the averages of weight-specific ammonia excretion for the weight class of 1.00 to 1O.00g were 1.03 µ 0.37 fJ.M/g/h and 1.21 µ 0.65 µ.M/g/h, respectively; for the weight class of 50.01 -60.00g these values were 0.68 µ 0.13 fJ.M/g/h and 0.60 µ 0.22 µ.M/g/h. The energy budget for the species was calculated at both temperatures using the experimental data and a model for marine teleosts proposed in the literature.

Descriptors: Marine fish, Bioenergetics, Animal metabolism, Energy budget, Excretory products, Oxygen consumption, Prionotus punctatus, Ubatuba, São Paulo, Brazil.

RESUMO

O consumo de oxigênio de rotina e a excreção de amônia de Prionotus punctatus coletados na região de Ubatuba (22º30'S), SP, Brasil, foram medidos a 20ºC e 25ºC, para avaliar os gastos e perdas de energia com os processos metabólicos. Foram utilizados indivíduos variando de 1,00g a 88,47g e de 1,79g a 56,50g, em experimentos a 20ºC e 25ºC, respectivamente. As médias de consumo específico de oxigênio a 20ºC e 25ºC para a classe de peso de 1,00 - 10,00g, comum a ambas as temperaturas, foram 162,46µ 39,51 µ.10z/g/h e 200,47 µ 92,46 µ.10z/g/h, respectivamente; para a classe de peso de 50,01 - 60,00g esses valores foram 112,30 µ 22,84 µ.10z/g/h e 114,60 µ 20,36 µ.10z/g/h. A 20ºC e 25ºC, as médias de excreção específica de amônia para a classe de peso de 1,00 a 10,00g foram 1,03 µ 0,37 e 1,21 µ 0,65 µ.M/g/h, respectivamente; para a classe de peso de 50,01 - 60,00g esses valores foram 0,68 µ 0,13 µ.M/g/h e 0,60 µ 0,22 µ.M/g/h. O orçamento energético para a espécie foi calculado para cada temperatura utilizando-se os da.dos experimentais e modelo proposto na literatura.

Descritores: Peixes marinhos, Bioenergética, Metabolismo animal, Orçamento energético, Produtos de excreção, Consumo de oxigênio, Prionotus punctatus, Ubatuba, São Paulo, Brasil.

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Acknowledgements

We are grateful to the Oceanographie Institute of São Paulo University (IOUSP), to the Interministerial Commission of Brazilian Sea Resources (SECIRM) for financial support and to the Brazilian Researeh Couneil (CNPq) for the reaseareh and productivity grants (Procs 301480/91-0 RN and 300299/77-0 RN). We also thank the staff of our laboratory for their help throughout this project, as also the anonymous referees for their careful readings and valuable suggestions.

(Manuscript received 03 November 1998; revised 30 April1998; accepted 08 November 1999)

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Publication Dates

• Publication in this collection
  22 Apr 2013
• Date of issue
  1999

History

• Reviewed
  30 Apr 1998
• Received
  03 Nov 1998
• Accepted
  08 Nov 1999