R. Paiva

Publications32
h-index8
Citations225
Highly Influential Citations20
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Macroparasites as biological tags for stock identification of the bluemouth, Helicolenus dactylopterus (Delaroche, 1809) in Portuguese waters.
Abstract In the present study, the macroparasite assemblage infecting Helicolenus dactylopterus (Delaroche, 1809) in three different areas off the Portuguese coast was evaluated in order to assess… Expand
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Reproductive strategy of the female deep-water shark birdbeak dogfish, Deania calcea : lecithotrophy or matrotrophy?
Little information is available on the maternal–embryonic relationships among sharks. Birdbeak dogfish ( Deania calcea ) has been described as ovoviviparous, but this term comprises a wide range of… Expand
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Feeding habits of the bluemouth, Helicolenus dactylopterus dactylopterus (Delaroche, 1809) (Pisces: Sebastidae) in the Portuguese coast
In order to investigate the feeding habits of Helicolenus dactylopterusdactylopterus along the continental Portuguese coast, a total of 619 individuals were sampled of which 60% contained food in… Expand
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The gelatinous matrix of the teleost Helicolenus dactylopterus dactylopterus (Delaroche, 1809) in the context of its reproductive strategy
Abstract The bluemouth, Helicolenus dactylopterus dactylopterus (Pisces: Sebastidae), is a zygoparous species with internal fertilization that stores the spermatozoa in crypts within the female… Expand
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Life history parameters as possible discriminators of bluemouth Helicolenus dactylopterus (Delaroche, 1809) populations in Portuguese waters
Abstract The age, growth and reproductive biology of bluemouth, Helicolenus dactylopterus were studied in order to assess the use of these life history parameters as possible population… Expand
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Modelling the growth of a protogynous sparid species, Spondyliosoma cantharus (Teleostei: Sparidae)
Age determination of fish species is a key process for fisheries management and the accuracy of assessments is highly dependent on age estimates. To model complex life histories such as protogynous… Expand
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IS THE FECUNDITY TYPE OF THE ZYGOPAROUS FISH SPECIES HELICOLENUS DACTYLOPTER US DETERMINATE OR INDETERMINATE
Bluemouth, Helicolenus dactylopterus, is a zygoparous species with internal fertilization that stores the spermatozoa in crypts within the female ovaries and then releases embryos in initial… Expand
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Discriminating bluemouth, Helicolenus dactylopterus (Pisces: Sebastidae), stocks in Portuguese waters by means of otolith shape analysis
ana neves, vera sequeira, ines farias, ana rita vieira, rafaela paiva and leonel serrano gordo Faculdade de Ciencias da Universidade de Lisboa, Departamento de Biologia Animal & Centro de… Expand
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Estimating fecundity in the zygoparous species Helicolenus dactylopterus (Actinopterygii, Scorpaeniformes): adaptation of the gravimetric method
Bluemouth, Helicolenus dactylopterus is zygoparous species with internal fertilization spawning multiple batches of early-celled embryos in gelatinous masses. Its unusual reproductive strategy… Expand
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Feeding habits of the cuttlefish Sepia officinalis during its life cycle in the Sado estuary (Portugal)
The importance of cephalopods in marine ecosystems is well recognized as they serve as important predators and prey in many food chains. During a 1-year period, cuttlefish were monthly sampled in… Expand
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