10 documents found, page 1 of 1
Designing a coastal monitoring marine biodiversity survey, using trammel nets a...
Rufino, Marta M.; Maia, Catarina; Dinis, David; Farias, Inês; Moura, Teresa; Gomes, Pedro; Quaresma, Ivania; Martins, Rogélia; Figueiredo, IvoneAlthough coastal areas are of great importance, they often lack long term monitoring surveys, which are essential for effective management, fisheries sustainability, and marine spatial planning. To address this, we conducted two experimental surveys aimed at assessing communities and their biodiversity, with the objective of designing a monitoring program for marine coastal biodiversity, based on gear type, dep...
Adapting the sampling design of research surveys to improve the biomass estimat...
Silva, Daniela; Menezes, Raquel; Serra-Pereira, Bárbara; Azevedo, Manuela; Figueiredo, IvoneResearch surveys are important to evaluate the spatial distribution of fishery re sources and to monitor their abundance. However, the underlying sampling is usually conceived with the focus on specific species and an efficient design may reconcile this objective with the collection of non-target species data. This study evaluates the adequacy of different sampling designs for the IPMA bottom trawl survey condu...
REPORT OF THE WORKSHOP ON MODELLING CATCH-PER-UNIT-EFFORT (WKCPUE)
Coelho, Rui; Fernandes, Ana Cláudia; Mendes, Hugo; Moura, Teresa; Serra-Pereira, Bárbara; Silva, Andreia V.; Silva, Cristina; Azevedo, ManuelaStandardized Catch-Per-Unit-Effort (CPUE), i.e., data from commercial fisheries that have been statistically modelled to remove fishery dependant effect, are often used in stock assessments as indicators of abundance and biomass. Here we report the outcomes of the workshop on modeling CPUEs that took place virtually on the 3-5 November 2020 and 6-7 January 2021 organized by IPMA and integrated in PNAB/DCF (Nati...
A investigação realizada no IPMA de suporte ao aconselhamento científico para a...
Serra-Pereira, Bárbara; Maia, Catarina; Lagarto, Neide; Figueiredo, IvoneIPMA is responsible for the study and scientific advice on the state of exploitation of some skate species with commercial interest. About 80% of skate and ray species’ landings are by-catch from the Portuguese polyvalent fleet, consisting of vessels holding licenses for various fishing gears (e.g. trammel nets, gillnets, longlines) and operating on the Portuguese continental shelf. The five species with more c...
O LABORATÓRIO DE ESCLEROCRONOLOGIA E OS ESTUDOS DE IDADE E CRESCIMENTO DE RECUR...
Farias, Inês; Soares, Eduardo; Moreno, Ana; Ferreira, Ana Luísa; Silva, Andreia; Serra-Pereira, Bárbara; Dinis, David; Morais, Delfina; Silva, DinaThe Laboratory of Sclerochronology and the age and growth studies of fishing resources A brief description of the growth studies developed by IPMA, I.P. is given in this report, with emphasis on the halieutic species currently studied both within the scope of the National Programme of Biological Sampling (under the EU/DG Fisheries’ Data Collection Framework (DCF)) as of other research projects and research line...
Using biological variables and reproductive strategy of the undulate ray Raja u...
Serra-Pereira, Bárbara; Erzini, Karim; Figueiredo, IvoneThe present work provides a detailed analysis of the reproductive strategy of the undulate ray Raja undulata in Portuguese mainland waters. The species was found mostly between 30 and 40 m deep on sandy bottoms. Egg-laying sites were observed in the north, centre and south-west regions, mainly at depths below 30 m. The peak of the reproductive season occurred from December to May. Asynchrony between reproductiv...
How is the morphology of the oviducal gland and of the resulting egg capsule as...
Maia, Catarina; Serra-Pereira, Bárbara; Erzini, Karim; Figueiredo, IvoneEgg capsules of Rajidae species vary in size, shape and adornments. These differences can be used as a taxonomic tool to differentiate species. Furthermore, since egg capsule external morphology is adapted to the environment where they are laid, it can be used make inferences on egg-laying grounds. In the present study, oviducal glands and egg capsules of seven species of skates (Leucoraja naevus, Raja brachyur...
Identification of potential essential fish habitats for skates based on fishers...
Serra-Pereira, Bárbara; Erzini, Karim; Maia, Catarina; Figueiredo, IvoneUnderstanding of spatio-temporal patterns of sensitive fish species such as skates (Rajidae) is essential for implementation of conservation measures. With insufficient survey data available for these species in Portuguese Continental waters, this study shows that fishery-dependent data associated with fishers' knowledge can be used to identify potential Essential Fish Habitats (EFH) for seven skate species. Si...
Skates and rays diversity, exploration and conservation - case-study of the tho...
Serra-Pereira, BárbaraSkates have been increasingly exploited in recent decades despite their recognized vulnerability to fishing (due to their life-history traits), and regardless of a lack of basic knowledge about their biology. The present thesis contributed to a great advance in the knowledge about skates in Portuguese waters, with special attention to the most abundant and commercially important species, the thornback ray Raja ...
The use of caudal thorns for ageing Raja undulata from the Portuguese continent...
Moura, Teresa; Figueiredo, Ivone; Farias, Inês; Serra-Pereira, Bárbara; Coelho, Rui; Erzini, Karim; Neves, Ana; Gordo, Leonel SerranoThe present study focuses on age estimation, with reproductive information contributing to the better understanding of the growth and the biology of Raja undulata. In the age and growth study, two calcified structures were used: caudal thorns and central vertebra. Results of readings showed that there were no significant differences in age estimates between the two structures. Both von Bertalanffy and Gompertz ...