Paulo Fonseca

Paulo Fonseca
Instituto Português do Mar e da Atmosfera | IPMA · Divisão de Modelação e Gestão de Recursos de Pesca

licenciatura em Biologia

About

68
Publications
19,216
Reads
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Citations
Introduction
Paulo Fonseca currently works at the Divisão de Modelação e Gestão de Recursos de Pesca, Instituto Português do Mar e da Atmosfera, Portugal. Paulo does research in Fisheries Technology and related subjects. He has been associated to the Centre of Marine Sciences (CCMAR) of the University of Algarve, Portugal from 2015 to 2021.
Additional affiliations
August 2015 - April 2017
Instituto Português do Mar e da Atmosfera
Position
  • BIOMETORE - Biodiversity in seamounts: the Madeira-Tore and Great Meteor
March 2015 - February 2019
Instituto Português do Mar e da Atmosfera
Position
  • MINOUW - Science, technology, and society initiative to minimize unwanted catches in European fisheries
January 2013 - December 2015
Instituto Português do Mar e da Atmosfera
Position
  • CONSUPESCA - Reduction of fuel consumption in coastal trawlers. PROMAR 31-03-05-FEP-0023, 2013-2015
Education
October 1979 - December 1985
Classic University of Lisbon, Faculty of Sciences
Field of study
  • Marine Biology

Publications

Publications (68)
Article
The bottom-trawl fishery in Portuguese continental waters is a multi-species one targeting benthic, demersal and pelagic fish, and cephalopods, where the blue whiting, Micromesistius poutassou and the longspine snipefish, Macroramphosus scolopax often constitute a major by-catch problem. The simultaneous capture of commercial and by-catch species h...
Article
Full-text available
Current fishing practices often do not allow adequate selection of species or sizes of fish, resulting in unwanted catches, subsequently discarded, with the consequent negative effects on both marine communities and fisheries profitability. The cross-analysis of density patches of potential unwanted catches and distribution of fishing effort can su...
Preprint
Full-text available
The concentration of the population in coastal regions, in addition to the direct human use, is leading to an accelerated process of change and deterioration of the marine ecosystems. Human activities such as fishing together with environmental drivers (e.g. climate change) are triggering major threats to marine biodiversity, and impact directly th...
Article
The activity of the Portuguese fishing fleet operating near seamounts of the Madeira Tore geologic complex was analyzed. The main objective is to identify the different fisheries taking place in the area, characterize the spatial patterns of vessels activity and estimate the fishing intensity, thus contributing to better inform management decisions...
Conference Paper
Full-text available
Open access to high quality data on marine ecosystems’ structure and functioning is determinant in driving research and promoting better advice and policy making. The SeaBioData platform was developed to accommodate different types of data, including data on human impacts, with the aim to implement tools (added-value services) to integrate and anal...
Article
A Sort‐X grid device with four different bar‐spacing grids (25, 30, 40 and 50 mm) was tested in the Gulf of Cádiz (GoC) on‐board commercial trawlers. A total of 83 fish, five crustacean and nine cephalopods species were sampled in 282 hauls. Most of the target and commercial bycatch species were sorted out by the grid with the exception of hake. Me...
Article
Full-text available
The present study provides an account of an experimental survey aiming at the evaluation of the catchability of the striped soldier shrimp, Plesionika edwardsii, using semi-floating shrimp traps off the Algarve coast (southern Portugal). Currently, this species is not targeted by the crustacean bottom trawl fleet, and preliminary results on product...
Article
Full-text available
The consequences of reallocating fishing effort from trawling to creels in an area off the West coast of Portugal for the operation of the trawl fleet, as well as on the population dynamics and the global catch value for a high-valued species, the Norway lobster (Nephrops norvegicus) are evaluated. The results suggest that only small portions of th...
Conference Paper
Full-text available
Vessel Monitoring Systems (VMS) were initially projected for the sole purpose of monitoring commercial fisheries. However, the data they generate are increasingly being viewed as essential in commercial stock research and management. The usefulness of these data for a correct estimation of the fishing effort depends on their coverage of the differe...
Conference Paper
Full-text available
A number of Portuguese longliners based on the mainland develop a part of their activity in the vicinity of Atlantic seamounts located at the geological complex Madeira Tore, covering long distances to visit a number of different seamounts in fishing trips lasting two to three weeks. The fishing pattern for these vessels is still poorly documented,...
Conference Paper
Full-text available
VMS (Vessel Monitoring System) data are increasingly being viewed as essential in commercial stock research and management. However, the usefulness of these data for the estimation of the fishing effort is highly dependent on the correct identification of the VMS registers associated to fishing operations. In this study, a VMS sample of unprocessed...
Conference Paper
Unwanted catches are a pervasive problem of world fisheries, representing a wasteful use of marine resources. The 2013 Reform of the EU Common Fisheries Policy has made a legal commitment to end discarding by implementing the Landings Obligation for those species subject to TAC or Minimum Conservation Reference Size. To mitigate the problem, the us...
Article
Full-text available
A model combining qualitative and historical quantitative data in an innovative rule-based fuzzy cognitive map framework is used to assess and compare the long-term bioeconomic impact of adopting gear modifications aimed at reducing bycatch in the Portuguese crustacean trawl fishery. The impact of codend-related changes (mesh size and shape) and th...
Conference Paper
Full-text available
Underwater imaging constitutes an alternative approach for stock assessment in some commercial fisheries. Herein, the Norway lobster, Nephrops norvegicus, a benthic burrowing crustacean, is used as our case study. An unified tracking scheme is presented to track our object of interest, either the lobsters themselves or their burrows, across video f...
Article
A growing demand for seabed and habitat mapping has taken place over the past years to support the maritime integrated policies at EU and national levels aiming at the sustainable use of sea resources. This study presents the results of applying the hierarchical European Nature Information System (EUNIS) to classify and map the benthic habitats of...
Article
Full-text available
The existence of a wide bed of the crinoid Leptometra celtica (M'Andrew and Barrett 1857), at approx-imately 500 m depth, off the Portuguese south coast is inferred from remotely operated vehicle (ROV) transects carried out as part of a research project (IMPACT) aimed at evaluating the impact of bottom trawling on the burrowing crustacean Norway lo...
Conference Paper
Full-text available
In recent years, the study of seafloor ecology has been significantly advanced thanks to the development of a panoply of instrumentation capable of measuring and recording dynamic events and/or processes in the seafloor and the water column. Underwater video cameras used on an array of platforms are one of these techniques, which have become increa...
Chapter
The Common Fisheries Policy is currently undergoing its third major reform. Within this reform, a new key topic will be introduced, a discard ban in European fisheries, allied to the obligation of landing the whole catch. If effectively enforced, a discard ban will have a diverse effect in different fisheries, but will affect particularly trawling...
Chapter
Full-text available
Satellite-based Vessel Monitoring System (VMS) data, consisting of vessel location and speed, have been used for fisheries control. However, the usefulness of these data can be extended to fisheries research, as the outputs provided by this system make it possible to map and quantify the fishing activity. One possible application is the estimation...
Article
Full-text available
Abstract: Video technology has been playing an increasing role in marine science, both for habitat mapping and estimating commercial species abundance. However, when quantification is needed, it is usually based on manual counting, a subjective and time-consuming task. The present work proposes a methodology to automatically quantify the abundance o...
Conference Paper
Full-text available
Trawling is the most fuel-intensive fishing activity, with trawlers constituting the fleet segment most affected by the high volatility of the fuel prices. This is likely to be a main driver for adopting fuel consumption reduction strategies, which may be related to alternative fishing practices. In this study, individual vessel trajectories obtain...
Article
Undersized and immature commercially important cephalopods are often inadvertently caught by trawlers in the eastern Mediterranean. To evaluate the effectiveness of different mesh codends (diamond, hexagonal and square) to reduce bycatch of juvenile commercially important Mediterranean cephalopods (European squid Loligo vulgaris, broadtail shortfin...
Article
Full-text available
The effects of different changes in the exploitation pattern were simulated for the Norway lobster, Nephrops norvegicus, stock exploited by trawl fishery in Alentejo and Algarve (ICES Functional Units 28 and 29) off the Portuguese coast. Current mesh size was assumed to be 55 mm (diamond) and several simulations were carried out considering increa...
Article
Full-text available
The effects of different changes in the exploitation pattern were simulated for the Norway lobster, Nephrops norvegicus, stock exploited by trawl fishery in Alentejo and Algarve (ICES Functional Units 28 and 29) off the Portuguese coast. Current mesh size was assumed to be 55 mm (diamond) and several simulations were carried out considering increas...
Conference Paper
Full-text available
O principal interesse deste estudo é contribuir para a avaliação da importância da malhagem e da forma da malha como medidas técnicas de conservação, na pescaria de arrasto dirigida aos crustáceos de profundidade. A aplicação deste tipo de medidas baseia-se no pressuposto de que a grande maioria dos indivíduos que escapam através das malhas do saco...
Article
Full-text available
The use of image-based technologies has gained increasing importance in marine research, particularly in benthic habitat classification and the assessment of epibenthic commercial species. A common application that has now entered into the routine of a number of northeastern Atlantic research institutes and in the Mediterranean (on an irregular bas...
Article
The recent rise in oil prices has brought renewed attention to energy savings in the fishing industry, and particularly in trawling. Coastal trawlers spend most of their time on fishing grounds near the coast. In such cases, the most successful energy-saving modifications ought to result from changes in the fishing gear and towing conditions. The p...
Conference Paper
Full-text available
Underwater video cameras mounted into towed platforms (e.g. sledges) have been increasingly used for the assess-ment of commercial crustacean stocks and also for more ecology-directed studies, including the impact of human activities in marine habitats. In this study a video camera was mounted on a trawl headline, to acquire footages at about 500 m...
Article
Full-text available
Fleet dynamics was addressed for three cephalopod taxa of commercial interest, the squid Loligo vulgaris, the octopuses Octopus vulgaris and Eledone cirrhosa, and the cuttlefish Sepia officinalis, for 48 trawlers of the fish trawling fleet. Landing profiles (LP) were identified based on the species composition of the landings using hierarchical cluster a...
Conference Paper
Full-text available
Underwater video is being increasingly used to assess the impact of human activities in marine habitats, as a comple-mentary tool for the assessment of commercial stocks. But, analysing video images manually to study and evaluate ma-rine habitats is a lengthy and tedious task. This paper pro-poses an automatic method to detect the Norway lobster (N...
Article
In this paper, the potential improvement of size-selectivity by increasing codend mesh size and changing twine type is addressed for the main commercial species exploited by crustacean trawlers in waters off the Portuguese south coast. Three cruises were conducted between autumn 1998 and summer 1999 onboard the F/V “Porto Bravo”, resulting in a tot...
Article
The bottom trawl fishery in Portuguese continental waters is a multi-species fishery where a large number of commercial species are landed by a fleet composed of about 100 trawlers. This paper presents the results obtained from applying ordination and classification methods to the 2002–2004 monthly landings per vessel with the purpose of defining landin...
Article
Full-text available
The utility of square mesh windows as by-catch excluders when placed either in the trawl upper belly or at the top of the cod-end is examined for a number of species captured off the Portuguese south coast. Data were obtained for the blue whiting, Micromesistius poutassou (Risso, 1826), the boarfish, Capros aper (L.), the horse mackerel, Trachurus...
Technical Report
Full-text available
In project NECESSITY (contract 501605) twenty three institutes and their respective sub-contractors were working together in two Task Groups, i.e. Nephrops and Cetaceans to develop alternative gear modifications and fishing tactics in collaboration with the fishing industry to reduce by-catches in the relevant Nephrops and pelagic fisheries, withou...
Conference Paper
Full-text available
A pesca de arrasto para os crustáceos de profundidade, a gamba, o lagostim e o camarão vermelho, é caracterizada por percentagens elevadas de capturas acessórias e de rejeições ao mar. A pressão sobre os recursos em causa, que se encontram intensamente explorados, levou à implementação de um plano de recuperação, que tem implicado limitações ao esf...
Article
Full-text available
The relationships of total length (Lt ) to girth at opercula (Gope) and maximum girths (Gmax) were estimated for 39 and 22 fish species, respectively, captured off the Portuguese coast between Povoa do Varzim and Santo Andre (38º05’54’’–41º15’36’’N and 8º46’54’’–9º31’13’’W). The data were collected between April 1994 and September 1995. The best-repr...
Article
Fishing with experimental gill-nets was carried out during 1994 and 1995 off the western coast of Portugal, using mesh sizes between 40 and 90 mm. Most sets were concentrated in the region between Setúbal and Lisbon in shallow waters up to 100 m, with about 1/4 being carried out at greater depths. A total of 88 species were captured over the 2 year...
Article
Full-text available
By-catch and discards are a common problem to all fisheries. Recent studies of the Portuguese crustacean-trawl fishery show that discards average 70% of the total catch. This situation poses a threat not only to the management of target and commercial fish by-catch species stocks, but also in terms of the ecosystem impact of the discarded species w...
Article
Weight–length (W–L) relationships were estimated for 46 species of fish captured off the western Portuguese coast between April 1994 and September 1995. The best-represented family was Scyliorhinidae (2677 fishes), followed by Gadidae (1871), Sparidae (1682) and Merlucciidae (1108). The estimates for the parameter b of the W–L relationship (W = aLb) r...
Article
The utility of oblique separator panels combined with square mesh windows for reducing by-catch (mainly boarfish (Capros aper), blue whiting (Micromesistius poutassou) and horse mackerel (Trachurus trachurus)) was examined in the Algarve crustacean trawl fishery.Three different panel/window mesh size combinations and the window alone were tested. T...
Article
The effects were evaluated of an increase in cod end mesh size from 65 to 70 and 80 mm and change of mesh configuration from 65 mm diamond to 65 mm square mesh on the size selectivity of hake (Merluccius merluccius), horse mackerel (Trachurus trachurus), four-spot megrim (Lepidorhombus boscii) and blue whiting (Micromesistius poutassou) captured on...
Article
Full-text available
The effects of an increase in cod end mesh size from 65 to 70 and 80 mm and a change of mesh configuration from 65 mm diamond to 65 mm square mesh on the size selectivity of horse mackerel (Trachurus trachurus), hake (Merluccius merluccius) and axillary seabream (Pagellus acarne) of the shallow groundfish assemblage off the Portuguese southwest coa...
Article
The effects of an increase in cod end mesh size from 55 to 60 and 70 mm and a change of mesh configuration from 55 mm diamond to 55 mm square mesh on the size selectivity of four by-catch species (the red shrimp Aristeus antennatus, the European hake Merluccius merluccius, the horse mackerel Trachurus trachurus and the blue whiting Micromesistius p...
Article
Cephalopods constitute a valuable resource of Portuguese fisheries, but there are no data on the adequacy of legal mesh size with regards to minimum landing size (MLS) (or weight).In the autumn of 1998 and the spring and summer of 1999 surveys were carried out off the northern coast of Portugal to study codend selectivity of finfish bottom trawls. Mes...
Article
The effects of an increase in cod end mesh size from 55 to 60 and 70 mm and a change of mesh configuration from diamond to square mesh on the size selectivity for rose shrimp Parapenaeus longirostris and Norway lobster Nephrops norvegicus captured off the Portuguese south coast were evaluated. The results were analysed taking into account between-h...