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Environmental assessment of sardine (Sardina pilchardus) purse seine fishery in Portugal with LCA methodology including biological impact categories.
Get PDFPurpose: The purse seine fishery for sardine is the most important fishery in Portugal. The aim of the present study is to assess the environmental impacts of sardine fished by the Portuguese fleet and to analyse a number of variables such as vessel size and time scale. An additional goal was to incorporate fishery-specific impact categories in the case study.\ud
Methods: Life CycleAssessmentmethodologywas applied, and\ud
data were collected from nine vessels, which represented around 10 % of the landings. Vessels were divided into two length categories, above and below 12 m, and data were obtained for the years 2005 to 2010. The study was limited to the fishing phase only. The standard impact categories included were energy use, global warming potential, eutrophication potential, acidification potential and ozone depletion potential. The fishery specific impact categories were overfishing, overfishedness, lost potential yield, mean trophic level and the primary production required, and were quantified as much as possible.\ud
Results and discussion: The landings from the data set were\ud
constituted mainly by sardine (91 %), and the remainders wereother small pelagic species (e.g. horse mackerel). The most important input was the fuel, and both vessel categories had the same fuel consumption per catch 0.11 l/kg. Average greenhouse gas emissions (carbon footprint) were 0.36 kg CO2 eq. per kilo sardine landed. The fuel use varied between years, and variability between months can be even higher. Fishing mortality has increased, and the spawning stock biomass has decreased resulting in consequential overfishing for 2010. A correlation between fuel use and stock biomass was not found, and the stock condition does not seem to directly influence the global warming potential in this fishery. Discards were primarily nontarget small pelagic species, and there was also mortality of target species resulting from slipping. The seafloor impact was considered to be insignificant due to the fishing method.\ud
Conclusions: The assessment of the Portuguese purse seine fishery resulted in no difference regarding fuel use between large and small vessels, but differences were found between years. The stock has declined, and it has produced below maximum sustainable yield. By-catch and discard data were missing but may be substantial. Even being difficult to quantify, fishery impact categories complement the environmental results with biological information and precaution is need in relation to the stock management. The sardine carbon footprint from Portuguese purse seine was lower than that of other commercial species reported in
Report of the Workshop to Evaluate the Management Plan for Iberian Sardine (WKSardineMP).
No full textReference points for the Iberian sardine stock (ICES areas VIIIc and IXa). Working Document to ICES-ACOM (5 June 2013) and to WGHANSA.
No full textReport of the Working Group on Southern Horse Mackerel, Anchovy and Sardine(WGHANSA) 21-26 June 2013, Bilbao, Spain
Get PDFApanha e pesca artesanal no litoral oceânico. Projecto PRESPO. DVD-ROM interactivo, 2ª versão.
No full textPequena pesca na costa continental portuguesa: \ud caracterização sócio-económica, descrição da actividade \ud e identificação de problemas. Projecto PRESPO, Instituto Português do Mar e da Atmosfera
No full textCommon dolphin (Delphinus delphis) habitat preferences using data from two platforms of opportunity
No full textCetaceans are difficult to observe in the wild, and demand complex logistics for dedicated collection of biological data. As such, the distribution of most cetacean species is still poorly understood. Ecological niche models are useful in studying species distributions and their ecological determinants, and platforms of opportunity (e.g. commercial nautical operators) can provide an alternative source for that data in cetaceans. In this study, we modelled common dolphin (Delphinus delphis) habitat preferences using ecological niche modelling and presence data obtained from distinct platforms of opportunity in two different areas in the Portuguese coast (west and south mainland Portugal) for the period 2005e2007. Models from southern Portugal were projected to western Portugal and vice-versa, to check for robustness in predicting the species ecological niche. Our results show that data from platforms of opportunity can result in robust ecological models and provide extremely useful information on cetacean ecology. We found that common dolphins exhibit a patchy distribution pattern over the Portuguese coastline, and identified key habitats for their occurrence. The most important variable associated with this species’ distribution was chlorophyll concentration which, given the results from previous research, we hypothesise reflects an ecological specialisation on pelagic schooling fish. Given that the most abundant schooling fish species in Portugal is increasingly overexploited and in constant decline, more attention should be given to the conservation of common dolphin in Portuguese waters
Protocolo de Amostragem a Bordo da Pesca do Cerco.
Get PDFIn 2006, the INRB, I.P./IPIMAR initiated an observer program on board purse seine fishing vessels under the siege of the Data Collection Regulation (PNAB, EU DCF).This work aimed to collect data from on board observations along the Portuguese coast, particularly regarding the pattern of activity, catch composition, income from fishing and discards at sea. Shipments were distributed by the national ports to reflect the relative importance of seasonality and landings. In order to standardize the collection of information, we designed a sampling protocol on board described in this report
