Direct and indirect estimates of natural mortality for the patagonian scallop zygochlamys patagonica
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 th...
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| Formato: | JOUR |
| Lenguaje: | English |
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_07308000_v29_n2_p381_Milessi |
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todo:paper_07308000_v29_n2_p381_Milessi2023-10-03T15:37:24Z Direct and indirect estimates of natural mortality for the patagonian scallop zygochlamys patagonica Milessi, A.C. Lasta, M. Iribarne, O. Kittlein, M.J. Argentina empirical methods natural mortality Zygochlamys patagonica Invertebrata Zygochlamys patagonica 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. JOUR English info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_07308000_v29_n2_p381_Milessi |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| language |
English |
| orig_language_str_mv |
English |
| topic |
Argentina empirical methods natural mortality Zygochlamys patagonica Invertebrata Zygochlamys patagonica |
| spellingShingle |
Argentina empirical methods natural mortality Zygochlamys patagonica Invertebrata Zygochlamys patagonica Milessi, A.C. Lasta, M. Iribarne, O. Kittlein, M.J. Direct and indirect estimates of natural mortality for the patagonian scallop zygochlamys patagonica |
| topic_facet |
Argentina empirical methods natural mortality Zygochlamys patagonica Invertebrata Zygochlamys patagonica |
| description |
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. |
| format |
JOUR |
| author |
Milessi, A.C. Lasta, M. Iribarne, O. Kittlein, M.J. |
| author_facet |
Milessi, A.C. Lasta, M. Iribarne, O. Kittlein, M.J. |
| author_sort |
Milessi, A.C. |
| title |
Direct and indirect estimates of natural mortality for the patagonian scallop zygochlamys patagonica |
| title_short |
Direct and indirect estimates of natural mortality for the patagonian scallop zygochlamys patagonica |
| title_full |
Direct and indirect estimates of natural mortality for the patagonian scallop zygochlamys patagonica |
| title_fullStr |
Direct and indirect estimates of natural mortality for the patagonian scallop zygochlamys patagonica |
| title_full_unstemmed |
Direct and indirect estimates of natural mortality for the patagonian scallop zygochlamys patagonica |
| title_sort |
direct and indirect estimates of natural mortality for the patagonian scallop zygochlamys patagonica |
| url |
http://hdl.handle.net/20.500.12110/paper_07308000_v29_n2_p381_Milessi |
| work_keys_str_mv |
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