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Mauna, A.C.. |
CDATA[Patagonian scallop (Zygochlamys patagonica) is a suspension feeder bivalve that presents the highest concentrations of recruits associated to the shelf-break front; but the temporal pattern of these recruitments have not been described in detail. Given the importance of recruitments for the development of the fishery and the population dynamics of the resource, in this report space-time distribution [catch per unit of effort (CPUE) of specimens =<, 15 mm, age 0+] is described and comparison between years and the Management Units (MU) 1.2 and 2 carried out. The study area corresponds to the North Management Sector of the patagonian scallop fishery (38º S-39º 30’ S, 55º W-56º W), Argentine Sea, SW Atlantic Ocean. The null hypothesis on recruitment... |
Tipo: Journal Contribution |
Palavras-chave: Scallop fisheries; Catch/effort; Recruitment; Stock assessment; Shelf fronts. |
Ano: 2013 |
URL: http://hdl.handle.net/1834/5488 |
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Lasta, M.L.; Hernandez, D.R.; Bogazzi, E.; Burgos, G.; Valero, J.; Lucifora, L.O.. |
To evaluate absolute biomass, a research cruise was conducted on three scallop (Zygochlamys patagonica)beds (38°S-56°W, September 1998). The estimated bed surface was 1,162 nm(2). Sampling stations were regularly spaced at 5 nm intervals. A total of 118 trawls were performed with a non-selective dredge 2,5 m wide (efficiency 16-21. ). Trawls duration and speed were 10 minutes and 3 nm.h(-1)respectively. Samples were taken to estimate total and commercial (greater or equal than 55 mm total height)scallop weight and size frequency distribution. Coefficients of variation (CV)of the estimated biomass were calculated for each bed using geoestatistical techniques and a simple random sampling alternative with the same number of samples. The CVs for total scallop... |
Tipo: Journal Contribution |
Palavras-chave: Fishery surveys; Scallop fisheries; Biomass; Abundance; Biomass; Http://aims.fao.org/aos/agrovoc/c_926. |
Ano: 2001 |
URL: http://hdl.handle.net/1834/1870 |
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