Skip to main content Accessibility help
×
Home

Efficiency and selectivity of the Anomalocardia brasiliana (Mollusca: Veneridae) hand dredge used in southern Brazil

  • Paulo R. Pezzuto (a1), Caroline Schio (a1) and Tito C.M. Almeida (a1)

Abstract

In Florianópolis, southern Brazil, the venerid clam Anomalocardia brasiliana has supported subsistence and small-scale commercial fisheries for decades. The introduction of a hand dredge (gancho) since 1987 led to the development of a significant fishery supplying both local and regional shellfish markets. In 1992 one of the main fishing areas in the region was designated as the first Brazilian Marine Extractive Reserve (Pirajubaé RESEX), a federal form of governance intended to promote sustainable exploitation of natural resources by assigning exclusive fishing rights to traditional users. However, excessive fishing effort, institutional shortcomings and lack of a negotiated management plan have resulted in the overexploitation of the species since 2000. This study was aimed at evaluating the efficiency and selectivity of the hand dredge currently in use at the RESEX, through a field experiment conducted in October 2006. Quantitative samples of A. brasiliana were collected before and after dredging 15 experimental plots. Additional samples were obtained inside the dredge (catch) and respective cover cod-end (discard) for selectivity analysis. A single haul of the hand dredge can dislocate up to 76% of the individuals present in the sediment irrespective of their size, and retain up to 69% of the commercial-sized organisms. The gear has a knife-edge selection pattern, which enables the use of the minimum spacing between the iron bars of the dredge's basket as an effective management tool.

Copyright

Corresponding author

Correspondence should be addressed to: P.R. PezzutoUniversidade do Vale do Itajaí (UNIVALI), Centro de Ciências Tecnológicas da Terra e do Mar (CTTMar), Rua Uruguai, 458, Caixa Postal 360, Centro, Itajaí-SC, CEP 88302-202, Brazil email: pezzuto@univali.br

References

Hide All
Araújo, C.M.Y. (2001) Biologia reprodutiva do berbigão Anomalocardia brasiliana (Mollusca, Bivalvia, Veneridae) na Reserva Extrativista Marinha do Pirajubaé. PhD thesis. Instituto de Biociências, Universidade de São Paulo, São Paulo, Brazil.
Araújo, M.L.R. and Rocha-Barreira, C.A. (2004) Distribuição espacial de Anomalocardia brasiliana (GMELIN, 1791) (Mollusca, Bivalvia, Veneridae) na praia do Canto da Barra, Fortim, Ceará, Brasil. Boletim Técnico Científico do CEPENE 12, 921.
Beukers-Stewart, B., Jenkins, S.R. and Brand, A.R. (2001) The efficiency and selectivity of spring-tooth scallop dredges: a comparison of direct and indirect methods of assessment. Journal of Shellfish Research 20, 121126.
Boehs, G. (2000) Ecologia populacional, Reprodução e Contribuição em Biomassa de Anomalocardia brasiliana (Gmelin, 1791) (Bivalvia: Veneridae) na Baía de Paranaguá, Paraná, Brasil. PhD thesis. Universidade Federal do Paraná, Paraná, Brazil.
Caddy, J.F. (1973) Underwater observations on tracks of dredges and trawls and some effects of dredging on a scallop ground. Journal of the Fisheries Research Board of Canada 30, 173180.
Caddy, J.F. (1989) A perspective on the population dynamics and assessment of scallop fisheries, with special reference to the sea scallop, Placopecten magellanicus Gmelin. In Caddy, J.F. (ed.) Marine invertebrate fisheries. Their assessment and management. New York: John Wiley & Sons, pp. 559589.
Dickie, L.M. (1955) Fluctuations in abundance of the giant scallop, Placopecten magellanicus (Gmelin), in the Digby area of the Bay of Fundy. Journal of the Fisheries Research Board of Canada 12, 797857.
Diogo, H.R.L. (2007) As reservas extrativistas marinhas. In Santos, S.B., Pimenta, A.D., Thiengo, S.C., Fernandez, M.A. and Absalão, R.S. (orgs) Tópicos em Malacologia—Ecos do XVIII Encontro Brasileiro de Malacologia. Rio de Janeiro: Sociedade Brasileira de Malacologia, pp. 135142.
Dolmer, P., Kristensen, P.S. and Hoffmann, E. (1999) Dredging of blue mussels (Mytilus edulis L.) in a Danish sound: stock sizes and fishery-effects on mussel population dynamic. Fisheries Research 40, 7380.
Fifas, S.P., Vigneau, J. and Lart, W. (2004) Some aspects of modeling scallop (Pecten maximus L.) dredge efficiency and special reference to dredges with depressor plate (English Channel, France). Journal of Shellfish Research 23, 611620.
Gaspar, M.B., Castro, M. and Monteiro, C.C. (1998) The influence of tow duration and tooth length on the number of damaged razor clams, Ensis siliqua. Marine Ecology Progress Series 169, 303305.
Gaspar, M.B., Leitão, F., Santos, M.N., Chícaro, L., Dias, M.D., Chícaro, A. and Monteiro, C.C. (2003a) A comparison of direct macrofaunal mortality using three types of clam dredges. ICES Journal of Marine Science 60, 733742.
Gaspar, M.B., Leitão, F., Santos, M.N., Sobral, M., Chícaro, L., Chícaro, A. and Monteiro, C.C. (2003b) Size selectivity of the Spisula solida dredge in relation to tooth spacing and mesh size. Fisheries Research 60, 561568.
Gedamke, T., Dupaul, W.D. and Hoening, J.M. (2005) Index-removal estimates of dredge efficiency for sea scallops on Georges Bank. North American Journal of Fisheries Management 25, 11221129.
Gulland, J.A. (1983) Fish stock assessment. A manual of basic methods. Chichester: John Wiley & Sons.
Hauton, C., Howell, T.R.W., Atkinson, R.J.A. and Moore, P.G. (2007) Measures of hydraulic dredge efficiency and razor clam production, two aspects governing sustainability within the Scottish commercial fishery. Journal of the Marine Biological Association of the United Kingdom 87, 869877.
Joll, L.M. and Penn, J.W. (1990) The application of high-resolution navigation systems to Leslie–Delury depletion experiments for measurement of trawl efficiency under open-sea conditions. Fisheries Research 9, 4155.
Kaiser, M.J., Collie, J.S., Hall, S.J., Jennings, S. and Poiner, I.R. (2001) Impacts of fishing gear on marine benthic habitats. Reykjavik Conference on Responsible Fisheries in the Marine Ecosystem, Iceland, 1–4 October.
Kim, I.O., Mituhasi, T., Jo, T.H., Park, C.D. and Tokai, T. (2005) Effect of tooth spacing on the contact selection and available selection of a dredge for the equilateral venus clam Gomphina melanaegis. Fisheries Science 71, 713720.
Lasta, M. and Iribarne, O.O. (1997) Southwestern Atlantic scallop (Zygochlamys patagonica) fishery: assessment of gear efficiency through a depletion experiment. Journal of Shellfish Research 16, 5962.
Leitão, F.M. and Gaspar, M.B. (2007) Immediate effect of intertidal non-mechanised cockle harvesting on macrobenthic communities: a comparative study. Scientia Marina 71, 723733.
Maltz, A. and Faerman, L. (1958) Moluscos comestíveis do Brasil: berbigões e mexilhões comuns do litoral paulista. Anais Farmácia e Química, São Paulo 9, 4549.
Maclennan, D.N. (1992) Fishing gear selectivity: an overview. Fisheries Research 13, 201204.
McLoughlin, R., Young, J., Martin, R.B. and Parslow, J. (1991) The Australian scallop dredge: estimates of catching efficiency and associated indirect fishing mortality. Fisheries Research 11, 124.
Meyer, T.L., Cooper, R.A. and Recci, K.J. (1981) The performance and environmental effects of a hydraulic clam dredge. Marine Fisheries Review 43, 1422.
Nandi, R. (2005) Ecologia populacional do berbigão Anomalocardia brasiliana (Gmelin, 1791) (Bivalvia: Veneridae) na Praia da Base—Reserva Extrativista Marinha do Pirajubaé, Florianópolis, SC. Monograph, Universidade do Vale do Itajaí, Santa Catarina, Brazil.
Narchi, W. (1972) Comparative studies of functional morphology of Anomalocardia brasiliana (Gmelin, 1791) and Tivela macroides (Born, 1778) (Bivalvia: Veneridae). Bulletin of Marine Science 22, 643670.
Nishida, A.K., Nordi, N. and Alves, R.R.N. (2006) Mollusc gathering in northeast Brazil: an ethnoecological approach. Human Ecology 34, 133144.
Orensanz, J.M.L., Parma, A.M., Turk, T. and Valero, J. (2006) Dynamics, assessment and management of exploited natural populations. In Shumway, S.E. and Parsons, G.J. (eds) Scallops: biology, ecology and aquaculture. Developments in aquaculture and fisheries science, 2nd edition. Amsterdam: Elsevier, pp. 765868.
Peso, M.C. (1980) Bivalves comestíveis da Baía de Todos os Santos: estudo quantitativo com especial referência a Anomalocardia brasiliana (Gmelin, 1791) (Molusca: Bivalvia). PhD thesis. Universidade Federal do Paraná, Paraná, Brazil.
Pezzuto, P.R. and Echternacht, A.M. (1999) Avaliação de impactos da construção da Via Expressa SC-SUL sobre o berbigão Anomalocardia brasiliana (Gmelin, 1791) (Mollusca: Bivalvia) na Reserva Extrativista Marinha do Pirajubaé, (Florianópolis, SC-Brasil). Atlântica 21, 105119.
Pezzuto, P.R. and Borzone, C.A. (2001) Padronização das eficiências de captura de diferentes equipamentos utilizados na prospecção da vieira Euvola ziczac (Linnaeus 1758) (Bivalvia: Pectinidae) no sul do Brasil. Atlântica 23, 2738.
Pezzuto, P.R., Araújo, C.M.Y. and Magalhães, A.R.M. (2002) Extração do berbigão Anomalocardia brasiliana (Gmelin, 1791) (Mollusca: Bivalvia) na Reserva Extrativista Marinha do Pirajubaé (Santa Catarina): diagnóstico e propostas para um ordenamento emergencial. Technical Report. Florianópolis: IBAMA/SC, 28 p.
Piersma, T., Koolhaas, A., Dekinga, A., Beukema, J., Dekker, R. and Essink, K. (2001) Long-term indirect effects of mechanical cockle-dredging on intertidal bivalve stocks in the Wadden Sea. Journal of Applied Ecology 38, 976990.
Powell, E.N., Ashton-Alcox, K.A., Dobarro, J.A., Cummings, M. and Banta, S.E. (2002) The inherent efficiency of oyster dredges in survey mode. Journal of Shellfish Research 21, 691695.
Rago, W.P., Keith, C., Hendrickson, L. and Murawski, S. (2000) Stock assessment of surf clams along the east coast of the United States: the importance of estimating dredge efficiency. Journal of Shellfish Research 19, 121126.
R Development Core Team (2007) R: A language and environment for statistical computing. Vienna: R Foundation for Statistical Computing, Austria.
Schaeffer-Novelli, Y. (1980) Análise populacional de Anomalocardia brasiliana (Gmelin, 1791), na praia do Saco da Ribeira, Ubatuba, São Paulo. Boletim do Instituto Oceanográfico, Universidade de São Paulo 29, 351355.
Schratzberger, M., Dinmore, T.A. and Jennings, S. (2002) Impacts of trawling on the diversity, biomass and structure of meiofauna assemblages. Marine Biology 140, 8393.
Souza, D.S. (2003) Dinâmica populacional do berbigão Anomalocardia brasiliana (Gmelin, 1791) (Mollusca: Bivalvia: Veneridae) na Reserva Extrativista Marinha do Pirajubaé (Florianópolis, SC). Monograph, Universidade do Vale do Itajaí, Santa Catarina, Brazil.
Souza, D.S. (2007) Caracterização da pescaria do berbigão Anomalocardia brasiliana (Gmelin, 1791) (Mollusca: Bivalvia: Veneridae) na Reserva Extrativista Marinha do Pirajubaé (Florianópolis, SC): Subsídios para o Manejo. Msc thesis. Universidade do Vale do Itajaí, Santa Catarina, Brazil.
Sparre, P. and Venema, S.C. (1998) Introdução à avaliação de estoques de peixes tropicais. FAO Fisheries Technical Paper. No. 306/1, revision 2. Rome. FAO, 407 p.
Tremel, E. (2001) Extração do berbigão Anomalocardia brasiliana (Gmelin, 1791) na Reserva Extrativista Marinha do Pirajubaé. Florianópolis: Associação dos Extrativistas da Reserva Extrativista Marinha do Pirajubaé.
Underwood, A.J. (2001) Experiments in ecology. New York: Cambridge University Press.
Von Behr, M. (1995) Reserva Extrativista Marinha do Pirajubaé. Reservas Extrativistas. Cambridge: IUCN, pp. 7780.

Keywords

Efficiency and selectivity of the Anomalocardia brasiliana (Mollusca: Veneridae) hand dredge used in southern Brazil

  • Paulo R. Pezzuto (a1), Caroline Schio (a1) and Tito C.M. Almeida (a1)

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed