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Abstract:

The adequacy of empirical estimates of natural mortality (M) for the Patagonian scallop Zygochlamys patagonica (King & Broderip, 1832) is assessed against a direct estimate based on catch-at-ago data obtained from fishery research surveys and auxiliary information on fishing effort exerted by the commercial fleet. Based mostly on growth parameter information resulting from the von Bertalanffy equation, we obtained empirical estimates of M based on formulas commonly used in fisheries assessment and quantified variation in their estimates though parametric bootstrapping. The modal values of direct estimates of M was 0.38/y, with a 95% confidence interval in the range 0.090.77/y. Estimates obtained with empirical models were close to direct estimates. In particular, a model developed for invertebrate species (Arce's model) was very close both in point values and variability. Our results suggest that for this species, the empirical estimates, which are easily obtainable and broadly used in many fisheries, can be reliably used when no other estimates are available. However, we contend that in other cases their use should be limited to species when the performances of empirical methods were compared with direct evaluations of M.

Registro:

Documento: Artículo
Título:Direct and indirect estimates of natural mortality for the patagonian scallop zygochlamys patagonica
Autor:Milessi, A.C.; Lasta, M.; Iribarne, O.; Kittlein, M.J.
Filiación:Instituto Nacional de Investigacin y Desarrollo Pesquero (INIDEP), Paseo Victoria Ocampo No. 1, 7600 Mar del Plata, Argentina
Comisin de Investigaciones Cientficas de la Provincia de Buenos Aires (CIC), Argentina
Departamento de Biologa, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar Del Plata, Funes 3250 4 to piso, (7600) Mar del Plata, Argentina
Idioma: Inglés
Palabras clave:Argentina; empirical methods; natural mortality; Zygochlamys patagonica; Invertebrata; Zygochlamys patagonica
Año:2010
Volumen:29
Número:2
Página de inicio:381
Página de fin:386
DOI: http://dx.doi.org/10.2983/035.029.0214
Título revista:Journal of Shellfish Research
Título revista abreviado:J. Shellfish Res.
ISSN:07308000
CODEN:JSHRD
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07308000_v29_n2_p381_Milessi

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Citas:

---------- APA ----------
Milessi, A.C., Lasta, M., Iribarne, O. & Kittlein, M.J. (2010) . Direct and indirect estimates of natural mortality for the patagonian scallop zygochlamys patagonica. Journal of Shellfish Research, 29(2), 381-386.
http://dx.doi.org/10.2983/035.029.0214
---------- CHICAGO ----------
Milessi, A.C., Lasta, M., Iribarne, O., Kittlein, M.J. "Direct and indirect estimates of natural mortality for the patagonian scallop zygochlamys patagonica" . Journal of Shellfish Research 29, no. 2 (2010) : 381-386.
http://dx.doi.org/10.2983/035.029.0214
---------- MLA ----------
Milessi, A.C., Lasta, M., Iribarne, O., Kittlein, M.J. "Direct and indirect estimates of natural mortality for the patagonian scallop zygochlamys patagonica" . Journal of Shellfish Research, vol. 29, no. 2, 2010, pp. 381-386.
http://dx.doi.org/10.2983/035.029.0214
---------- VANCOUVER ----------
Milessi, A.C., Lasta, M., Iribarne, O., Kittlein, M.J. Direct and indirect estimates of natural mortality for the patagonian scallop zygochlamys patagonica. J. Shellfish Res. 2010;29(2):381-386.
http://dx.doi.org/10.2983/035.029.0214