33 documents found, page 1 of 4
Fully protected marine areas linked to reduced home ranges of fishes
Ohayon, S.; Abecasis, D.; Almeida, P.R.; Alós, J.; Aspillaga, E.; Belo, A.F.; Costa, J.L.; Franco, A.; Lorenzo, M.; Ferguson, A.; Guidetti, P.Home range size is a fundamental trait that can affect the probability of fish being harvested and, at the same time, may be affected by fishing. The relationship between home range size and fishing will impact the effectiveness of fully protected areas (FPAs), as it will influence the number of fish moving into fished areas, affecting both spillover and edge effects. One hypothesis is that individuals within F...
The seaward migration of European eel at a continental scale: A Europe-wide bio...
Verhelst, P.; Righton, D.; Aarestrup, K.; Almeida, P.R.; Bašic, T.; Bolland, J.D.; Carter, L.; Coeck, J.; Costa, J.L.; Dainys, J.; Davidsen, J.G.The European eel (Anguilla anguilla L.) has a catadromous life cycle, with a single panmictic population that colonises continental Europe and northern Africa yet migrates 5000 to 9000 km to spawn in the Atlantic Ocean. It is unknown how this continental migration is organised so individual eels arrive in time for spawning with conspecifics. This meta-analysis combined tracking data from 18 water bodies in fres...
Upstream movement of juvenile eels (Anguilla anguilla L.) in a southwestern Eur...
Monteiro, R.M.; Domingo, I.; Almeida, P.R.; Costa, J.L.; Pereira, E.; Belo, A.F.; Portela, T.; Telhado, A.; Quintella, B.R.The upstream movement of juvenile eels (median total length (TL) = 138 mm) in the Mondego River, Portugal, was analysed between January 2017 and August 2019. A total of 12,019 individuals (TL ranging from 60 to 287 mm) were counted and measured on an eel ladder at Coimbra weir, 44 km upstream from the river mouth, during their upstream movements. Although eels were counted throughout the year, a clear seasonal ...
Movements of hatchery-reared dusky groupers released in a Northeast Atlantic Co...
Silva, A.F.; Horta e Costa, B.; Costa, J.L.; Pereira, E.; Marques, J.P.; Castro, J.J.; Lino, P.G.; Candeias-Mendes, A.; Pousão-Ferreira, P.; Sousa, I.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—‘Sudoeste Alentejano’ and ‘Costa Vicentina’ Marine Park) since 201...
Early settlement and growth of stocked European glass eels in a fragmented wate...
Félix, P.; Costa, J.L.; Quintella, B.R.; Almeida, P.R.; Monteiro, R.; Santos, J.; Portela, T.; Domingos, I.One of the actions that has been implemented to support the recovery of the panmictic population of European eel is stocking of waterbodies where natural recruitment is low or null. However, growth conditions of the stocked eels can vary greatly. This circumstance emphasises the importance to determine ideal habitat conditions to contribute to the success of stocking actions and, consequently, to increase the p...
Fine-scale behaviour of the Lusitanian toadfish assessed in situ with the AccelTag
Pereira, T.J.; Almeida, P.R.; Quintella, B.R.; Gronningsaeter, A.; Costa, M.J.; Marques, J.P.; Costa, J.L.Three-axis acceleration sensor acoustic transmitters (AccelTag) programmed to identify specific acceleration patterns associated with particular behaviours (e.g., burrowing, attack) were used to study some aspects of the ecology of the Lusitanian toadfish Halobatrachus didactylus (Bloch & Schneider 1801). The AccelTag combines the features of archival tags (records acceleration in all three directions measuring...
Effects of hydropeaking on the behaviour, fine-scale movements and habitat sele...
Rato, A.S.; Alexandre, C.M.; Almeida, P.R.; Costa, J.L.; Quintella, B.R.Hydropeaking is widely known for changing the quantity and quality of the available habitat downstream of hydroelectric facilities, thus affecting all stages of fish life cycles. Hydropeaking impacts on salmonids are widely studied, but knowledge of its effects on cyprinids, which are dominant in Mediterranean areas, is scarce. In this study, 11 Iberian barbel (Luciobarbus bocagei, Steindachner 1864) were tagge...
Evaluating movement and populations Dynamics of meagre (Argyrosomus regius) usi...
Tanner, S.; Reis-Santos, P.; Alexandre, C.; Almeida, P.R.; Alves, J.; Amorim, C.; Costa, J.L.; Domingos, I.; Fonseca, P.; Lança, M.J.; Marques, J.P.Meagre (Argyrosomus regius) forms ephemeral aggregations during the reproductive season that, given the large size and high commercial value of this species, lead to increased risk of overexploitation. Data paucity together with the inability to apply classical fisheries assessment techniques and management measures due to the seasonally-elusive dynamics of adult meagre, and the diffuse nature of artisanal fish...
Can a restocking event with European (glass) eels cause early changes in local ...
Félix, P.M.; Costa, J.L.; Monteiro, R.; Castro, N.; Quintella, B.R.; Almeida, P.R.; Domingos, I.In an attempt to assist the recovery of the panmictic population of the European eel, declining since the late 1980s, the restocking of areas with low or no natural recruitment has been one of the measures adopted to reverse this trend. However, the main focus in several monitoring programmes for these actions, has been in the best interest of its viability and cost/benefit relationships and, for that, the cond...
Migration and escapement of silver eel males, Anguilla anguilla, from a southwe...
Monteiro, R.; Domingos, I.; Almeida, P.R.; Costa, J.L.; Alexandre, C.M.; Quintella, B.R.The catadromous life cycle of the European eel encompasses a spawning migration to the Sargasso Sea. Prior to their migration, eels develop a silver coloration being referred to as “silver eels.” Due to the dramatic European eel recruitment decline, it is crucial to quantify silver eel escapement to evaluate the success of measures taken under Eel Management Plans (Regulation EC (1100/2007)). Thus, the percenta...