Luis Bentes

Luis Bentes
  • University of Algarve

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102
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Current institution
University of Algarve

Publications

Publications (102)
Article
Full-text available
Marine Protected Areas are increasingly used as tools to preserve marine habitats and biodiversity worldwide. Nonetheless, creating MPAs in densely populated multi-use coastal areas comes with intrinsic conflict potential, since protection and economic development are not always hand-in-hand and local users might disagree with the designation of su...
Article
In southern Iberia (NE Atlantic), cetacean bycatch is reported in several fisheries, whereas depredation by bottlenose dolphin (Tursiops truncatus) is commonly observed in bottom set-net fisheries. This study tested the effectiveness of acoustic deterrent devices in discouraging small cetaceans from approaching bottom set-nets and purse seine to re...
Article
Full-text available
Small-scale commercial fisheries represent a significant economic activity that can be affected by coastal Marine Protected Areas (MPAs). Official fishery landings data can serve as an effective means of evaluating the effects of MPAs on fisheries and harvested species, as they are available over long periods and do not incur any costs. However, th...
Conference Paper
Full-text available
Despite a growing interest in animal welfare in production systems, there remains a paucity of information concerning the welfare of fish, especially in the case of commercial fisheries. Fish caught in fixed nets (i.e. gill and trammel nets) experience multiple stressors from the time of capture to mortality on deck that are considered detrimental...
Poster
Full-text available
Wild-capture fisheries are important for global food security, particularly in developing nations; • Aquatic animal welfare is increasingly becoming a topic on the agenda of governments; • European consumers believe fish deserve the same protection as other production animals; • Growing evidence that poor catch welfare impacts both the sustainabili...
Poster
Full-text available
Animal welfare is an emerging issue in aquaculture and fisheries, relating to ethics, animal health and product quality. A growing number of researchers, decision makers and advocacy groups have been pushing for catch welfare to be thoroughly researched and integrated in the conversation about the future of seafood standards. Carefish/catch project...
Article
Full-text available
The widespread adoption of acoustic telemetry has transformed our understanding of marine species' behavior and movement ecology. However, accurately interpreting telemetry data, especially concerning tagging mortality, is essential for drawing valid conclusions. In this study, we scrutinized tagging mortality in 223 individuals across 14 species a...
Technical Report
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This technical report explores key issues for the sustainability of the marine coastal tourism sector at Algarve, including carrying capacity and acess rules of the most important marine tourism hotsop at Algarve, and its close links to MPAs.
Technical Report
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EUSeaMap 2023 is the sixth iteration of EUSeaMap. All versions have been produced as part of the EMODnet Seabed Habitats project, which is one of several thematic lots in EMODnet. The project has brought together a European consortium of specialists in benthic ecology and seabed habitat mapping. The partners first worked together in EMODnet Phase 1...
Article
Full-text available
The use of tracking devices, such as vessel monitoring systems or automatic identification system, enabled us to expand our knowledge on the distribution and quantification of fishing activities. However, methods and models based on vessel tracking data are mostly devised to be applied to towed gears, whereas applications to multi-gear and passive...
Article
Studies assessing fish spatial behaviour are essential to better understand the performance of marine protected areas. However, few studies have focused on the fine-scale movements related to reproduction, a key feature in a population’s perpetuation. Knowledge of movements modulated by reproduction is particularly important since migrations toward...
Article
Full-text available
This study is the first to evaluate the fish provisioning services of a whole transitional landscape (Ria Formosa lagoon, Portugal), in parallel with the enhancement of growth, survival and production of single cohorts of the most important commercial fish species by vegetated and unvegetated sub-tidal habitats. Based on monthly beach seine samples...
Article
Full-text available
Marine Protected Areas (MPAs) are a tool to safeguard marine natural systems, yet their effectiveness depends on how well they are integrated into the existing socioeconomic context. Stakeholder engagement in MPA design can contribute to increasing integration. This study focuses on the co-design of an MPA between researchers, public administration...
Article
Full-text available
Monitoring the ecological status of marine coastal lagoons requires the integration of multiple indices. However, the efficacy of monitoring programs is complicated by the diverse array of habitats that conform coastal lagoons. In this study, we compared four sampling methods (25-m and 50-m beach seines, beam trawl and Riley push net) in the Ria Fo...
Article
Marine protected areas (MPAs), and specially no-take areas (NTAs), play an important role in protecting target populations from fisheries. When developing spatial conservation and management tools, the design has mainly focused on population-level measures of fish home ranges, spawning and feeding areas, and migration routes. Intraspecific differen...
Article
Full-text available
No-take areas are key instruments to promote the effectiveness of Marine Protected Areas (MPAs), particularly concerning the protection of endangered species such as the dusky grouper (Epinephelus marginatus). However, despite the establishment of no-take areas and the prohibition of catching this species in a southwestern Portuguese MPA (SACVMP—‘S...
Conference Paper
Full-text available
Marine Protected Areas (MPAs) have played an important role in the protection of endangered species such as the dusky grouper (Epinephelus marginatus), and the no-take areas have been particularly crucial for this purpose. Yet, despite the establishment of no-take areas and the legislation banning dusky groupers’ catches since 2011 in a southwester...
Article
Full-text available
Marine Protected Areas (MPAs) require effective indicators to assess their performance, in compliance with the goals of relevant national and international commitments. Achieving and prioritizing shortlists of multidisciplinary indicators demands a significant effort from specialists to depict the multiple conservation and socioeconomic interests,...
Article
Full-text available
The first major step in training an object detection model to different classes from the available datasets is the gathering of meaningful and properly annotated data. This recurring task will determine the length of any project, and, more importantly, the quality of the resulting models. This obstacle is amplified when the data available for the n...
Article
Full-text available
EUSeaMap 2021 is the fifth iteration of EUSeaMap. All versions have been produced as part of the EMODnet Seabed Habitats project, which is one of several thematic lots in EMODnet. The project has brought together a European consortium of specialists in benthic ecology and seabed habitat mapping. The partners first collaborated in EMODnet phase 1 (2...
Article
Full-text available
Identifying vulnerable marine habitats is fundamental to promote evidence-based management and a sustainable use of our oceans. Although progress in the mapping of marine benthic habitats has been made, complex ecosystems such as submarine canyons remain largely unexplored, hampering evidence-based management from taking place in these ubiquitous f...
Technical Report
Full-text available
Final report/relatório final do Projeto iNOVPESCA - Redução de capturas acidentais de espécies marinhas protegidas em pescarias costeiras algarvias: inovação de procedimentos e técnicas de mitigação. Contextualização, metodologia, resultados e proposta de boas práticas para encontrar reduzir conflitos entre pescas e espécies marinhas protegidas na...
Article
Full-text available
The recent establishment of the “landing obligation” under the reformed EU Common Fishery Policy has the twofold objective of reducing the excessive practice of discarding unwanted catch at sea and encouraging more selective and sustainable fisheries. Within this context, the awareness of the spatial distribution of potential unwanted catches is im...
Technical Report
Full-text available
Since its inception, in 2009, EMODnet Seabed Habitats has brought together a European consortium of specialists in benthic ecology and seabed habitat mapping to develop a transnational broad-scale seabed habitat map, named EUSeaMap. EUSeaMap is the only pan-European cartographic product that provides a standardised trans-boundary overview of the sp...
Article
Discards is an important issue in fisheries around the world. The spatial management of discards has attracted interest as a potential tool for minimizing the unwanted catch. The aim of the present work was to identify areas with high quantities of bottom trawl discarded catch regarding species subjected to MCRS, in six areas of southern European w...
Technical Report
Full-text available
EUSeaMap 2019 is the third iteration of EUSeaMap. All versions have been produced as part of the EMODnet Seabed Habitats project, which is one of several thematic lots in EMODnet. In the new version, the spatial coverage has been extended further North in order to include the Barents Sea. The spatial detail has substantially been improved. This has...
Technical Report
Full-text available
Mapping and socioeconomic valuation of the marine industries operating in the coastal area of the newly created Natural Marine Park of the Algarve Reef Pedra do Valado
Article
Full-text available
Reducing the impact on vulnerable species through changes in fishing practices, such as the spatial or temporal avoidance of certain areas, is key to increase the ecological sustainability of fisheries. However, it is often hampered by the availability of sufficiently detailed data and robust indicators. Existing trawl surveys are a cost-effective...
Preprint
Full-text available
This paper presents the results of a pilot experiment with an existing tidal energy converter (TEC), Evopod 1 kW floatable prototype, in a real test case scenario (Faro Channel, Ria Formosa, Portugal). A baseline marine geophysical, hydrodynamic and ecological study based on the experience collected on the test site is presented. The collected data...
Article
Full-text available
The growth in tourism in the Cape Verdean Sal Island has been a cause as well as a consequence of a number of investments (both by the State and the private entities) to create synergies for that sector, ensuring and promoting the island’s touristic attractiveness. Such increases in the number of visitors, allied with the island’s marine biodiversi...
Conference Paper
Full-text available
The European Union Regulation 1380/2013 revising the Common Fisheries Policy (CFP) aims at addressing the by-catch and discarding problem in commercial fisheries by implementing the "Landing Obligation" of the regulated species by 2019. To date, in adjacent waters of the Mediterranean sea, the Gulf of Cadiz (GoC) landing ports are not ready to comp...
Technical Report
Full-text available
This study contains transdisciplinary information on biological, ecological, geological and oceanographic aspects of – and human activities in – the Armação de Pêra Bay. The study was conducted to aid the establishment of a Marine Protected Area on the southern coast of the Algarve region of Portugal in response to significant community interest.
Conference Paper
Full-text available
Recreational fishing is an important socioeconomic activity that needs systematic studies and data monitoring programs. The Pescardata project, coordinated by the Centre for Marine Sciences of the University of Algarve has two goals: (1) fill the gaps with regard the systematic collection of data on the recreational catches of the species included...
Article
Full-text available
Experimental fishing was conducted off the port of Quarteira (southern Portugal) from October 2016 to February 2017 using standard trammel nets and modified nets rigged with a guarding net. The commercial catches of trammel nets rigged with a guarding net were 46.1% and 38.0% less than those of the standard net in numbers and economic value. Howeve...
Article
Full-text available
This paper presents the results of a pilot experiment with an existing tidal energy converter (TEC), Evopod 1 kW floatable prototype, in a real test case scenario (Faro Channel, Ria Formosa, Portugal). A baseline marine geophysical, hydrodynamic and ecological study based on the experience collected on the test site is presented. The collected data...
Article
Full-text available
The effects of two different slipping methods on the survival, physical and physiological response of sardines, Sardina pilchardus, captured in a purse-seine fishery were investigated in southern Portugal. Sardines were collected and transferred into holding tanks onboard a commercial fishing vessel after being captured, crowded and deliberately re...
Data
Survival estimates for sardine using Kaplan-Meier survival curves (dashed line), overlaid with the predictions from the selected mixture-distribution survival model M3 (solid lines with 95% confidence bands) for the three treatment replicates (1–3): Control, standard slipping (SS) and modified slipping (MS). (TIF)
Article
The estimated impact of the EU Landing Obligation was investigated, which bans discards of regulated species, in South European fisheries through stakeholders' perceptions with the intention to identify implementation shortcomings and practicalities that might lead to obstacles to enforcement. Structured interviews were conducted with 173 fishers i...
Article
The increased number of human activities within the marine environment and the demand for maritime space has increased to a point where in some parts of the globe the demand for maritime space has exceeded the available area. The overlapping objectives and activities have caused severe conflicts among users and with the natural marine environment i...
Article
Full-text available
This paper shares the experiences, observations and discussions that occurred during the completing of an ecosystem services' (ES) indicator framework to be used at European Union and Member States' level. The experience base was drawn from three European research projects and 14 associated case study sites that include 13 transitional-water bodies...
Poster
Full-text available
The present study aims to assess if small MPAs can be effective tools to protect thornback rays and enhance their recovery from fishing pressure. For this, a small MPA in Atlantic temperate waters was chosen as a case study. Study questions: - Is this species abundance increasing within the MPA boundaries? - Does this species have high or low site...
Conference Paper
Full-text available
Príncipe Island (140 km2) has an incredible rich biodiversity. This region, together with the other Gulf of Guinea islands, was considered one of the 10 Richest Centers of Marine Endemism. The beaches are mainly used by green sea turtles ( Chelonia mydas ) and a small number of hawksbills ( Eretmochelys imbricata ) and leatherbacks ( Dermochelys co...
Poster
Full-text available
Príncipe Island (140km2) has an incredible rich biodiversity. This region, together with the other Gulf of Guinea islands, was considered one of the 10 Richest Centers of Marine Endemism. The beaches are mainly used by green sea turtles ( Chelonia mydas ) and a small number of hawksbills ( Eretmochelys imbricata ) and leatherbacks ( Dermochelys cor...
Technical Report
Full-text available
This Good Practice Guide is the outcome of a project co-funded by the European Commission (DG Mare) called Transboundary Planning in the European Atlantic (TPEA), which ran from December 2012 to May 2014. The aim of the project was to demonstrate approaches to transboundary maritime spatial planning (MSP) in the European Atlantic region. This is on...
Article
If marine management policies and actions are to achieve long-term sustainable use and management of the marine environment and its resources, they need to be informed by data giving the spatial distribution of seafloor habitats over large areas. Broad-scale seafloor habitat mapping is an approach which has the benefit of producing maps covering la...
Article
Full-text available
In this study, the length-weight (LWR) parameters were estimated for six syngnathid species, including 2 seahorses and 4 pipefishes, from Ria Formosa, a temperate lagoon from the south coast of Portugal. A total of 5070 fishes were used to determine the LWR. The estimated b value ranged from 2.95 (Nerophis ophidion) to 3.36 (Syngnathus abaster). To...
Poster
Full-text available
The main purpose of this work is to produce small scale predictions of Coral garden habitats based on remote operated vehicle (ROV) observations.
Article
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The weight-length relationships (WLR) were estimated for five fish species of Ria Formosa, a coastal lagoon in southern Portugal. WLRs for Gobius couchi, Pomatoschistus microps and Parablennius pilicornis were determined for the first time ever and for Gobius cruentatus for the first time for the southern European Atlantic coast.
Article
Artificial reefs are used as management tools for coastal fisheries and ecosystems and the knowledge of habitat use and fish movements around them is necessary to understand their performance and improve their design and location. In this study wild specimens of Diplodus sargus were tagged with acoustic tags and their movements were tracked using p...
Technical Report
Full-text available
This report provides full documentation of the new proposals for EUNIS habitats up to level 5 for marine habitats found under the MeshAtlantic project. Three case studies were presented in detail, the Algarve region and the Southwestern Coast in Portugal and the Basque Country in Spain, plus other contributions from Brittany (France). Overall, ther...
Article
Full-text available
Twenty-five specimens of the hermit crab Calcinus tubularis were observed during SCUBA dives for fauna and flora assessment in the shallow rocky reefs of the southern coast of Portugal between 2003 and 2008. Of the specimens observed, only one specimen used a tube gallery, while the others occupied unidentified gastropod shells with strong bio-cove...
Conference Paper
Full-text available
This paper proposes advanced methodologies for the study of tagged marine animals, resorting to telemetry techniques. The robotic tools to be developed and operated will be able to track the acoustic signals emitted by the animals, based on range and depth data acquired with ultra-short baseline positioning (USBL) systems aided Inertial Navigation...
Article
Full-text available
Parallel fishing trials with 0.30 mm diameter monofilament gill nets and longlines using small hooks were carried out in the Algarve (southern Portugal) over a one-year period, 1997-1998, with the objective of comparing species composition, catch rates, discards and size ranges. Four hook sizes of MUSTAD brand, round bent, flatted sea hooks (number...
Article
Full-text available
Ocinebrina nicolai Monterosato, 1884 a marine mollusc belonging to the Muricidae family is reported from Algarve, south coast of Portugal for the first time and is a new record for the biodiversity of the Portuguese malacological fauna and northeastern Atlantic waters. This species with a medium-size shell for the genus (14–16 mm) was initially sam...
Article
Full-text available
The common pandora, Pagellus erythrinus, is a commercially important seabream for coastal fisheries in the north and central eastern Atlantic. Age, growth and reproductive aspects of the southern Portuguese population were estimated by analysing 386 specimens ranging in total length (TL) from 12.0 to 44.8 cm. Ages were estimated by counting growth...
Article
Full-text available
The African hind Cephalopholis taeniops (Valenciennes, 1828) is one of the most important commercial demersal species caught in the Cape Verde archipelago. The species is closely associated with hard substrate and is one of the main attractions for SCUBA divers. In January 2006 a former Soviet fishing vessel - the Kwarcit - was sunk off Santa Maria...
Article
Full-text available
The striped sea bream, Lithognathus mormyrus, used for this population dynamics study were obtained from longline catches and market sampling in the Algarve (south Portugal). The macroscopic analysis of the gonads and the gonad somatic index showed that the south Portuguese population of L. mormyrus spawns mainly between late spring and summer (Jun...
Article
Full-text available
Weight2013length relationships (WLRs) are presented for 54 species sampled by several types of fishing gear between February 2004 and May 2007, in the Arade estuary (southern Portugal). WLRs for six species are presented for the first time.
Article
Acoustic telemetry and standard tag-recapture were used to determine the home range and residency of juveniles and sub-adults of Diplodus sargus and Diplodus vulgaris in the Ria Formosa (Portugal) coastal lagoon. Maximum time between recaptures for the standard tag-recapture method was 128 days for D. sargus and 30 days for D. vulgaris. The majorit...
Chapter
Full-text available
Three hatchery produced and reared (HPR) and five wild white sea bream (Diplodus sargus) were double tagged with Vemco V8SC-2L acoustic transmitters and Floy Tag T-bar anchor tags, and released on artificial reefs located near a natural reef off the southern coast of Portugal. Passive telemetry was used to monitor movements of the white sea bream o...
Article
Full-text available
The faunal communities of four intertidal habitats namely sand, mud, seagrass (Zostera noltii) and seagrass patches (mixSM) of a temperate coastal lagoon, Ria Formosa (southern Portugal), were sampled. A total of 47 species were taken in 428 bottomless drop sampler samples, with the highest number of species and the more commonly occurring species...
Article
Full-text available
The catches and discards of trawlers, seiners and trammel netters were studied in the Algarve (southern Portugal) using observers onboard commercial fishing vessels. Species diversity was high, with 236 species recorded as occasionally, frequently or regularly discarded. Mean discard rates per trip were 0.13, 0.20, 0.27, 0.62 and 0.70, respectively...
Article
Full-text available
Non-commercial invertebrate discards in an experimental trammel net fishery were studied in relation to selectivity of the gear, depth, soak time and season. Forty experimental fishing trials were carried out over a 1-year period with six combinations of small mesh (100, 120 and 140 mm) inner and large mesh (600 and 800 mm) outer panels. On average...
Article
Full-text available
Fisheries bycatches and discards constitute a significant problem in many fisheries worldwide. Unlike the pelagic purse-seine, the demersal purse seine usually targets high commercial value demersal species such as sea breams (e.g., Diplodus spp., Pagellus spp., Sparus aurata) and the European sea bass (Dicentrarchus labrax), while discards consist...
Article
Otoliths and scales were used to determine age and growth of: Boops boops (Linnaeus, 1758), Diplodus vulgaris (Geoffroy Saint-Hilaire, 1817), Diplodus sargus (Linnaeus, 1758), Lithognathus mormyrus (Linnaeus, 1758), Pagellus acarne (Risso, 1827), Pagellus erythrinus (Linnaeus, 1758) and Spondyliosoma cantharus (Linnaeus, 1758). These structures cam...
Article
Full-text available
Fish communities of the Ria Formosa coastal lagoon (south Portugal) were sampled on a monthly basis with a beach seine at 4 sites, during two different time periods: 1980–1986 and 2001–2002. Community indices, species ranking and multivariate analysis were used in order to identify changes in the fish community between the two time periods. A total...
Article
Full-text available
Several juvenile specimens of Sparisoma cretense, a previously unrecorded species, were caught using beach seining in Ria Formosa.The hypothesis that these occurrences are related with climatic changes is discussed.
Book
Monografia de divulgación sobre las caracteristicas biológicas y de la pesca de distintas especies de interes comercial de este ambito geografico que redunde en la optimización de la gestión de los recursos pesqueros. Esta monografia forma parte del capítulo de transferencia de resultados y divulgación derivada parcialmente de los trabajos realizad...
Article
Full-text available
Samples of Boops boops ranging from 7.4 to 30.5 cm were obtained mainly by longline, supplemented by beach seining in the Ria Formosa lagoon, and by market sampling in the Algarve (southern Portugal). The macroscopic analyses of the gonads and the gonad somatic index showed that the south coast of Portugal B. boops spawn mainly from late winter to...
Article
Trammel net size selectivity was studied for the most important métiers in four southern European areas: the Cantabrian Sea (Atlantic, Basque Country, Spain), the Algarve (Atlantic, southern Portugal), the Gulf of Cádiz (Atlantic, Spain) and the Cyclades Islands (Mediterranean, Aegean Sea, Greece). These métiers were: cuttlefish (Sepia officinalis)...
Article
Full-text available
Fish fauna were collected in two different subtidal shallow sites, seagrass and sand, using a small beam trawl in the Ria Formosa lagoon (South Portugal). Samples were taken at low and high tides, during day and night, and in each season. Fish assemblages associated with each site were significantly different, with seagrass site supporting greater...
Article
Full-text available
Abstract  The effects of commercial trawling on the malacological communities (except for the Cephalopoda) were examined, based on a study undertaken between 1996 and 2000 on the continental shelf and slope of southern Portugal. More than 50% of species caught by trawling in southern Portugal were discarded, with molluscs representing about 19%. Fo...
Article
Full-text available
In Portugal, elasmobranch landings have decreased substantially in recent years. In this work, elasmobranch catches in semi-pelagic longlines (1997 and 1998) were compared with those in trammel nets (2000) in the Algarve, southern Portugal areas. In the semi-pelagic longline fi shery, 7 elasmobranch species represented 33.4% (2 185 specimens) of th...
Article
Full-text available
Axillary seabream, Pagellus acarne, caught by longlines in the Algarve (Southern Portugal), were sampled between August 1995 and August 1996. Age was studied by counting growth increments on otoliths and the estimated von Bertalanffy parameters were Linf = 28.82 cm, K = 0.29 year-1 and t0 = -1.47 year for males and Linf = 32.30 cm, K = 0.18 year-1...
Article
Full-text available
Fishing trials with monofilament gill nets and longlines using small hooks were carried out in Algarve waters (southern Portugal) over a one-year period. Four hook sizes of "Mustad" brand, round bent, flatted sea hooks (Quality 2316 DT, numbers 15, 13, 12 and 11) and four mesh sizes of 25, 30, 35 and 40 mm (bar length) monofilament gill nets were u...
Article
Full-text available
The population dynamics parameters of Diplodus vulgaris (Sparidae) from the south and south-west coast of Portugal were studied. 1086 fishes with total lengths ranging from 3.3 to 37.9 cm were obtained from previous gear selectivity studies supplemented by market sampling and beach seining for juveniles (1992–2000). The spawning season extended fro...
Article
Full-text available
Elasmobranch fish, particularly deep-sea sharks, are the mostimportant component of the by-catch of the hake semipelagic near-bottom ‘pedra-e-bola’ longlinefishery in the Algarve (South Portugal) and most of these fish arediscarded. The effects of the removal of the lower hooks were evaluated,in terms of target and by-catch reductions, by quantifyi...
Article
Discards from five of the most important fisheries (crustacean trawling, fish trawling, demersal purse seining, pelagic purse seining and trammel netting) in southern Portugal were studied and compared. A total of 236 species of all taxa were discarded, with fish and cephalopods accounting for more than 90% of the discarded biomass, except trammel...
Article
Full-text available
A 2-year study of the European hake (Merluccius merluccius) semi-pelagic (“pedra-bola”) longline fishery was carried out in the Algarve (southern Portugal). This fishery takes place on the continental slope at 200–700m depths, using monofilament longlines that are lifted off the bottom at regular intervals by glass balls. Hook selectivity trials we...
Technical Report
Full-text available
Knowledge of discarding practices and discard rates is of considerable importance for stock assessment and management of fisheries. Estimation of fishing mortality rates is fundamental for stock assessment and the formulation of sound scientific advice. Ideally, estimation of fishing mortality should take into consideration discards. Lack of discar...
Article
Full-text available
Three long-line methods have been studied in the Algarve: 1) small-hook long-line for inshore (less than 30 m) ‘white’ sea breams (Sparidae); 2) small-hook long-line for deeper water (40-60 m) ‘red’ sea breams; and 3) deep water (500-700 m) semi-pelagic long-line for hake Merluccius merluccius (Linnaeus, 1758). Selectivity studies were carried out...
Article
Full-text available
A longline 'métier' using small hooks for 'red' sea breams (Pagellus acarne and Pagellus erythrinus) in the Algarve (south of Portugal) was studied. Experimental longlining was carried out with three sizes of "Mustad" round bend, flatted, spade end Quality 2316 DT hooks (numbers 11, 13 and 15) and two types of bait: razor shell (Ensis siliqua) and...
Technical Report
Full-text available
The effects of the discarding of by-catch at sea on community structure, trophic interactions, and stability are poorly known. However, there is some evidence that large quantities of discards may have a significant impact on multispecies fisheries. With the increasing emphasis on multispecies or ecosystem-based management approaches, it is necessa...
Article
Full-text available
The relationship between fish total length (TL) and mouth size in six species was investigated in light of the implications for the modelling of size selectivity of hooks. Significant non-linear relationships were found in three species, suggesting that optimal size at capture is not a linear function of hook size. These results strongly support th...
Article
Full-text available
Weight-length relationships were estimated for 31 fish species from the south and south-west coasts of Portugal. These species, which are mainly sea breams (Sparidae), dominate the catches of the main fixed gears used in this region and account for more than 50% and 40% of the total fish landings by weight and by value.
Article
Full-text available
The species and size selectivity of long-lines using small hooks were studied off the south coast of Portugal using "Mustad" brand round bent, flatted sea hooks (Quality 2316 DT) numbers 15, 13, and 11 baited with razor shell clam (Ensis siliqua). Hook numbers 13 and 11 are 49 and 109% larger respectively than number 15 hooks in terms of overall si...

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