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Registros recuperados: 27
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The Paracentrotus lividus populations from the northern Moroccan Atlantic coast: growth, reproduction and health condition ArchiMer
Bayed, Abdellatif; Quiniou, Francoise; Benrha, Ali; Guillou, Monique.
The condition of three intertidal Paracentrotus lividus populations, which inhabit an area between Rabat and Casablanca (Morocco) known by its high wave energy and its substantial anthropogenic disturbances were described. The growth rate of the juvenile sea urchins in this intertidal zone was low compared with more sheltered populations. A sharp increase in the gonad index was observed between January and March at the beginning of a period of algal production, and was concomitant with increases in seawater temperature and food consumption rate. This gonad index increase was followed by a single spawning period occurring between March and June, probably triggered by the phytoplankton bloom induced by upwelling conditions. Larval development in all three...
Tipo: Text Palavras-chave: Moroccan Atlantic; Growth; Population; Juvenile; Reproduction.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-602.pdf
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Comment épargner les juvéniles de soles et de gadidés dans la pêcherie crevettière : expériences de chalut sélectif en baie de Vilaine, première partie ArchiMer
Dupouy, Herve; Vacherot, Jean-philippe; Meillat, Marc.
The French brown shrimp (Crangon crangon) fishery employs on a seasonal basis around 140 ships about 10 metres in length and with engines of about 100 kilowatts of power. It takes place mainly along the coastal bottoms of silted-up sand at a depth of 2 to 10 metres and occupies principally the coasts of the eastern English Channel and those of the Gulf of Gascony. The brown shrimp catch is performed by bottom trawl, with exempted meshing of 20 mm (stretched mesh), which causes numerous rejects of immature fish that live on the same bottoms. The main part of these juveniles is made up of flat fish (sole, in particular) and of gadidae (whiting and pout). To reduce these undesirable catches that are also detrimental to other fisheries, some ingenious...
Tipo: Text Palavras-chave: Selective trawl; Devisme trawl; Asselin trawl; Brittany; Bay of Vilaine; Gadides; Sole; Whiting; Pout; Juvenile; Chalut devisme; Chalut Asselin; Chalut sélectif; Baie de Vilaine; Gadidés; Soles; Merlan; Tacaud; Juvéniles.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/1997/rapport-2669.pdf
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Redescription of Ochmacanthus batrachostoma (Miranda-Ribeiro, 1912) (Siluriformes: Trichomycteridae): a possible case of incipient paedomorphism Neotropical Ichthyology
S. Neto,Caio; Pinna,Mário de.
ABSTRACT The lepidophagous stegophiline catfish Ochmacanthus batrachostoma (Miranda-Ribeiro, 1912) is endemic to the Paraná-Paraguai basin and is the only member of its genus in that drainage. It remains a poorly-known taxon mainly due to the historical scarcity of study specimens. The species is herein redescribed on the basis of type and non-type specimens from Brazil, Argentina and Paraguay. Ochmacanthus batrachostoma can be distinguished from congeners by the presence of long maxillary and rictal barbels, reduction of the posterior end of the caudal peduncle, a tadpole-like caudal fin and peduncle, among other morphometric traits and features of internal anatomy. Comparisons show that a number of unique traits of adult O. batrachostoma resemble...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Juvenile; Paraná-Paraguai drainage; Paedomorphosis; Stegophilinae; Taxonomy.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000100213
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Intraspecific interactions in the mangrove crab Ucides cordatus (Decapoda: Ocypodidae) during the metamorphosis and post-metamorphosis periods under laboratory conditions Rev. Bras. Zool.
Ventura,Robson; Silva,Ubiratã A. T. da; Ostrensky,Antonio; Cottens,Kelly.
Current efforts for restocking natural populations of the mangrove crab Ucides cordatus (Linnaeus, 1763) in Brazil have focused on developing a methodology for stimulating the metamorphosis of U. cordatus larvae at a large scale. The aim of the present study was to compare the mortality rates both in individual and mass conditions, during the induction of metamorphosis of megalopa to juvenile in U. cordatus, without the use of mangrove sediment as substrate. Furthermore, the importance of intraspecific antagonistic behavior on survivorship rates during early post-metamorphosis period was investigated. Metamorphosis was induced by the use of water conditioned with conspecific adults (30 indiv. 100 L-1 for 24 hours). In the first assay, megalopae were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cannibalism; Juvenile; Megalopa; Nursery.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702011000100001
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First field record of mangrove crab Ucides cordatus (Crustacea: Decapoda: Ucididae) recruits co-inhabiting burrows of conspecific crabs Rev. Bras. Zool.
Schmidt,Anders Jensen; Diele,Karen.
Recruits of the mangrove crab Ucides cordatus (Linnaeus, 1763), rarely encountered in the field were found co-inhabiting burrows of larger male and female conspecifics in the mangrove forest. They were located in the sediment of the inner walls and burrow plugs. Average carapace width (CW) of the hosting and co-inhabiting crabs was 3.8 ± 0.20 and 0.9 ± 0.03, respectively. As shown by the size-frequency distribution, while most recruits leave the conspecific burrows after reaching 1.0 cm CW, some stay until they reach a size of 2.5 cm CW. The results of this study contribute to a better understanding of recruitment patterns in this ecologically and economically important mangrove crab species. Follow-up studies are however needed to fully determine the role...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Caranguejo-uçá; Juvenile; Recruitment; Settlement; Size-frequency.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000400026
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Desenvolvimento juvenil de Cyrtograpsus angulatus Dana (Crustacea, Decapoda, Grapsidae), em laboratório Zoologia
Rieger,Paulo Juarez; Beltrão,Roberta.
This paper describes the first nine juvenile stages of Cyrtograpsus angulatus Dana, 1851 obtained in laboratory conditions from three ovigerous females collected at "Molhes da Barra", Rio Grande, Brazil (32ºS and 52ºW). The main morphological features, the secondary sexual characters and the gills ontogeny were observed. Twenty one individuals reached until the ninth juvenile stage. Sexual dimorphism can be verified from the fourth juvenile stage and the number of gills are complete at the second juvenile stage.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Crustacea; Brachyura; Grapsidae; Development; Juvenile.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752000000200012
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Duration of the pre-settlement period of the mangrove crab Ucides cordatus (Decapoda: Ocypodidae) under laboratory conditions BABT
Ventura,Robson; Silva,Ubiratã de Assis Teixeira da; Perbiche-Neves,Gilmar; Ostrensky,Antonio; Boeger,Walter Antonio Pereira; Pie,Marcio Roberto.
The goal of the present study was to determine the most appropriate time to release the immatures of Ucides cordatus (Linnaeus) produced in the laboratory into the natural environments. Specifically, the time when the megalopae sought the mangrove sediment to excavate the burrows was determined, as well as the time necessary for their metamorphosis into the first juvenile stage. Results indicated that the megalopae of U. cordatus reared in the laboratory took three to ten days (median = 6) after their molt to excavated burrows in the sediment. The average time for the megalopae to molt into juveniles was 12.6 days (SD = 2.3).
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ucides cordatus; Restocking; Larval rearing; Settlement; Megalopae; Juvenile.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000500012
Registros recuperados: 27
Primeira ... 12 ... Última
 

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