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Identificação e caracterização de sequências codificadoras de peptídeos antimicrobianos (PAM) nas células da hemolinfa de espécies nativas de peneídeos marinhos

Rosa, Rafael Diego da
Fonte: Florianópolis, SC Publicador: Florianópolis, SC
Tipo: Dissertação de Mestrado Formato: 1 v.| il., tabs.
POR
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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Biológicas. Programa de Pós-Graduação em Biotecnologia; Proteínas ou peptídeos antimicrobianos (PAM) são componentes essenciais do sistema imune inato e encontram-se amplamente distribuídos entre vertebrados, invertebrados e plantas. São moléculas relativamente pequenas, de caráter anfipático e catiônico, podendo apresentar uma atividade microbicida rápida e potente contra um amplo espectro de microrganismos. Em camarões peneídeos, três classes de PAM foram isoladas e caracterizadas molecular e funcionalmente, a partir de suas células sangüíneas ou hemócitos: peneidinas (PEN), crustinas (CRUS) e os fatores anti-lipopolissacarídeos (ALF). O objetivo desse estudo foi o de detectar, clonar e caracterizar molecularmente seqüências semelhantes a PEN, CRUS e ALF nos hemócitos de três espécies nativas de camarões peneídeos Farfantepenaeus paulensis, F. subtilis e Litopenaeus schmitti, além de elaborar filogramas a partir das seqüências obtidas. Através da utilização de iniciadores desenhados a partir de regiões de consenso de seqüências disponíveis em bancos gênicos públicos, foi possível amplificar fragmentos de cDNA correspondentes às três classes de PAM acima mencionadas nos diferentes peneídeos. Em F. subtilis foi clonada uma seqüência semelhante à PEN do subgrupo 2 denominada de Farsub PEN2-1 (GenBank: EF450742)...

Connectivity between tropical coastal habitats:using stable isotopes in juvenile penaeid shrimps and potential food sources

Abreu, Daniela Carvalho de, 1990-
Fonte: Universidade de Lisboa Publicador: Universidade de Lisboa
Tipo: Dissertação de Mestrado
Publicado em //2008 ENG
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Tese de mestrado, Biologia (Biologia e Gestão de Recursos Marinhos), 2008, Universidade de Lisboa, Faculdade de Ciências; Mangroves and its adjacent coastal systems such as seagrass meadows, muddy and sandy habitats are well known as nurseries areas for numerous species, particularly penaeid shrimps, one of the most important fishery resources in the world. Spatial and temporal coastal habitat utilization by individuals of different species is often associated to the food availability and protection against predators that each habitat may provide. A better understanding on the coastal habitats use as refuge and feeding ground for a variety of species and their movement between and across habitats is extremely important to elucidate the connectivity between the habitats which therefore is extremely important information for the preparation of conservation and management plans of the fishery resources and their habitats. Making use of carbon and nitrogen stable isotope analysis, the present study, conducted at Inhaca Island (south of Mozambique) in two mangrove fringed bays (Saco and Sangala Bays), intended to investigate the biological connectivity within the mangrove and its adjacent coastal habitats (sand flat, mud flat and seagrass meadows) in terms of feeding areas for four of the most commercially important penaeid shrimps species in Mozambique (Metapenaeus monoceros...

In silico analysis of polymorphic microsatellites in penaeid shrimp and construction of a free-access database

Freitas,Patrícia Domingues de; Pinheiro,Allysson Pontes; Silva,Thiago Buosi; Galetti Junior,Pedro Manoel
Fonte: Sociedade Brasileira de Genética Publicador: Sociedade Brasileira de Genética
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2007 EN
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We performed an in silico analysis of all microsatellites so far described for penaeid shrimp and for which the polymorphic behavior has previously been analyzed. The objective of the study was to evaluate the structural characteristics of these microsatellites and identifying patterns which allow the characterization of the nature of these sequences in the penaeid genome. All data were compiled in a free-access database specially constructed for this study. Three hundred non-mononucleotide polymorphic microsatellite loci described for 12 shrimp species belonging to the family Penaeidae were analyzed and simple and compound microsatellites with di-, tri-, tetra-, penta- and hexanucleotide motifs were found. Dinucleotides and trinucleotides were the most frequent motifs among both the simple and the compound microsatellites. Although a certain bias related to different microsatellite isolation methodology could not be discarded, it is possible that part of this microsatellite abundance reflects some degree of conservation of microsatellite motifs among the different species. There was a pronounced motif variability within and between species, indicating high differentiation dynamism of these repetitions in this animal group. This study not only sheds light on the structure of the microsatellites present in the penaeid shrimp genome but also resulted in the free-access Penaeid Shrimp Microsatellite Database (available at http://www.shrimp.ufscar.br) which may be very useful for optimizing the use of these microsatellites.

Identification, tissue distribution and orexigenic activity of neuropeptide F (NPF) in penaeid shrimp

Christie, Andrew E.; Chapline, M. Christine; Jackson, James M.; Dowda, Jenilee K.; Hartline, Niko; Malecha, Spencer R.; Lenz, Petra H.
Fonte: Company of Biologists Publicador: Company of Biologists
Tipo: Artigo de Revista Científica
EN
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The neuropeptide Fs (NPFs) are an invertebrate subgroup of the FMRFamide-like peptides, and are proposed by some to be the homologs of vertebrate neuropeptide Y. Although there is some information about the identity, tissue distribution and function of NPFs in insects, essentially nothing is known about them in crustaceans. We have identified and characterized NPF-encoding transcripts from the penaeid shrimp Litopenaeus vannamei and Melicertus marginatus. Two transcripts were identified from each species. For each shrimp species, the two transcripts differed from one another by the presence or absence of an insert in the portion of the open reading frame that encodes the NPF peptide. The two NPF isoforms are identical in L. vannamei and M. marginatus, with their predicted structures being KPDPSQLANMAEALKYLQELDKYYSQVSRPRFamide and KPDPSQLANMAEALKYLQELDKYYSQVSRPSPRSAPGPASQIQALENTLKFLQLQELGKLYSLRARPRFamide. RT-PCR tissue profiling showed both transcripts are broadly distributed within the nervous system of each species. The transcript encoding the shorter NPF was detected in some, but not all, midgut samples. The transcript encoding the longer NPF was absent in the midgut of both species, and neither transcript was detected in their skeletal muscle. Juvenile L. vannamei fed on a diet supplemented with the shorter NPF exhibited a marked increase in food intake relative to control individuals that did not receive the supplement; the NPF-fed shrimp also showed a significant increase in growth relative to the control group. Our data suggest that NPF is present in both the nervous system and midgut of penaeid shrimp...

Experimental Infection and Detection of Necrotizing Hepatopancreatitis Bacterium in the American Lobster Homarus americanus

Avila-Villa, Luz A.; Gollas-Galván, Teresa; Martínez-Porchas, Marcel; Mendoza-Cano, Fernando; Hernández-López, Jorge
Fonte: The Scientific World Journal Publicador: The Scientific World Journal
Tipo: Artigo de Revista Científica
Publicado em 03/05/2012 EN
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Necrotizing hepatopancreatitis bacterium (NHPB) is an obligated intracellular bacteria causing severe hepatopancreatic damages and mass mortalities in penaeid shrimp. The worldwide distribution of penaeid shrimp as alien species threatens the life cycle of other crustacean species. The aim of the experiment was to evaluate the possibility of experimentally infecting the American lobster (Homarus americanus) with NHPB extracted from shrimp hepatopancreas. Homogenates from infected shrimp were fed by force to lobsters. Other group of lobsters was fed with homogenates of NHPB-free hepatopancreas. After the 15th day from initial inoculation, the presence of NHPB was detected by polymerase chain reaction in feces and hepatopancreas from lobsters inoculated with infected homogenates. Necrotized spots were observed in the surface of lobster hepatopancreas. In contrast, lobsters fed on NHPB-free homogenates resulted negative for NHPB. Evidence suggests the plasticity of NHPB which can infect crustacean from different species and inhabiting diverse latitudes. Considering the results, the American lobster could be a good candidate to maintain available NHPB in vivo.

Potential relationship among three antioxidant enzymes in eliminating hydrogen peroxide in penaeid shrimp

Wang, Dongdong; Li, Fuhua; Chi, Yanhong; Xiang, Jianhai
Fonte: Springer Netherlands Publicador: Springer Netherlands
Tipo: Artigo de Revista Científica
EN
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Antioxidant enzymes, such as glutathione peroxidase (GPx), catalase (CAT), and peroxiredoxin (Prx), are essential components in cells to eliminate excessive reactive oxygen species such as hydrogen peroxide (H2O2). GPx, CAT, and Prx genes have been reported in penaeid shrimp, and they showed different expression profiles at transcription or protein level when shrimps were challenged by microbes. In order to learn the relationship among the above three genes in their function, GPx, CAT, and Prx transcripts were analyzed, and the variation of GPx and CAT enzyme activity was detected when shrimp was injected with H2O2 or one antioxidant enzyme gene was silenced in shrimp by double-strand RNA injection. The results indicated that there existed some relationships among three antioxidant enzyme genes, CAT, GPx, and Prx in shrimp at transcriptional level. The transcription of CAT and GPx could be directly induced by H2O2 injection, while the transcription of Prx cannot be induced by H2O2. Decreased transcription level of CAT or GPx could lead to increased transcription of the other two genes, which suggested that there existed some compensation among these three antioxidant enzyme genes. These data can help us to understand the roles of antioxidant enzymes in crustacean.

Molecular Biology and Epidemiology of Hepatopancreatic parvovirus of Penaeid Shrimp

Safeena, Muhammed P.; Rai, Praveen; Karunasagar, Indrani
Fonte: Springer-Verlag Publicador: Springer-Verlag
Tipo: Artigo de Revista Científica
EN
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Hepatopancreatic parvovirus (HPV) is one of the major shrimp parvovirus which is known to cause slow growth in penaeid shrimps. HPV has been found in wild and cultured penaeid shrimps throughout the world and there is high genetic variation among the different geographic isolates/host species. Given its high prevalence, wide distribution and ability to cause considerable economic loss in shrimp aquaculture industry, HPV deserves more attention than it has received. Till date, a total of four complete genome sequences of HPV have been reported in addition to a large number of partial sequences. HPV infection is seldom observed alone in epizootics and has occurred in multiple infections with other more pathogenic viruses and in most cases, heavy infections result in no visible inflammatory response. A great deal of information has accumulated in recent years on the clinical signs, geographical distribution, transmission and genetic diversity of HPV infection in shrimp aquaculture. However, the mechanism by which HPV enters the shrimp tissues and pathogenesis of virus is still unknown. To date, no effective prophylactic measures are available to reduce the infection in shrimps. To control and prevent HPV infection, considerable research efforts are on. This review provides information on current knowledge on HPV infection in penaeid shrimp aquaculture.

Insights into the Prostanoid Pathway in the Ovary Development of the Penaeid Shrimp Penaeus monodon

Wimuttisuk, Wananit; Tobwor, Punsa; Deenarn, Pacharawan; Danwisetkanjana, Kannawat; Pinkaew, Decha; Kirtikara, Kanyawim; Vichai, Vanicha
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica
Publicado em 08/10/2013 EN
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The prostanoid pathway converts polyunsaturated fatty acids (PUFAs) into bioactive lipid mediators, including prostaglandins, thromboxanes and prostacyclins, all of which play vital roles in the immune and reproductive systems in most animal phyla. In crustaceans, PUFAs and prostaglandins have been detected and often associated with female reproductive maturation. However, the presence of prostanoid biosynthesis genes remained in question in these species. In this study, we outlined the prostanoid pathway in the black tiger shrimp Penaeus monodon based on the amplification of nine prostanoid biosynthesis genes: cytosolic phospholipase A2, hematopoietic prostaglandin D synthase, glutathione-dependent prostaglandin D synthase, prostaglandin E synthase 1, prostaglandin E synthase 2, prostaglandin E synthase 3, prostaglandin F synthase, thromboxane A synthase and cyclooxygenase. TBLASTX analysis confirmed the identities of these genes with 51-99% sequence identities to their closest homologs. In addition, prostaglandin F2α (PGF2α), which is a product of the prostaglandin F synthase enzyme, was detected for the first time in P. monodon ovaries along with the previously identified PUFAs and prostaglandin E2 (PGE2) using RP-HPLC and mass-spectrometry. The prostaglandin synthase activity was also observed in shrimp ovary homogenates using in vitro activity assay. When prostaglandin biosynthesis was examined in different stages of shrimp ovaries...

RNA-seq as a powerful tool for penaeid shrimp genetic progress

Santos, Camilla A.; Blanck, Danielly V.; de Freitas, Patrícia D.
Fonte: Frontiers Media S.A. Publicador: Frontiers Media S.A.
Tipo: Artigo de Revista Científica
Publicado em 28/08/2014 EN
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The sequences of all different RNA transcripts present in a cell or tissue that are related to the gene expression and its functional control represent what it is called a transcriptome. The transcripts vary between cells, tissues, ontogenetic and environmental conditions, and the knowledge that can be gained through them is of a solid relevance for genetic applications in aquaculture. Some of the techniques used in transcriptome studies, such as microarrays, are being replaced for next-generation sequencing approaches. RNA-seq emerges as a new possibility for the transcriptome complexity analysis as well as for the candidate genes and polymorphisms identification of penaeid species. Thus, it may also help to understand the determination of complex traits mechanisms and genetic improvement of stocks. In this review, it is first introduced an overview of transcriptome analysis by RNA-seq, followed by a discussion of how this approach may be applied in genetic progress within penaeid stocks.

Comparative Transcriptomic Characterization of the Early Development in Pacific White Shrimp Litopenaeus vannamei

Wei, Jiankai; Zhang, Xiaojun; Yu, Yang; Huang, Hao; Li, Fuhua; Xiang, Jianhai
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica
Publicado em 08/09/2014 EN
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Penaeid shrimp has a distinctive metamorphosis stage during early development. Although morphological and biochemical studies about this ontogeny have been developed for decades, researches on gene expression level are still scarce. In this study, we have investigated the transcriptomes of five continuous developmental stages in Pacific white shrimp (Litopenaeus vannamei) with high throughput Illumina sequencing technology. The reads were assembled and clustered into 66,815 unigenes, of which 32,398 have putative homologues in nr database, 14,981 have been classified into diverse functional categories by Gene Ontology (GO) annotation and 26,257 have been associated with 255 pathways by KEGG pathway mapping. Meanwhile, the differentially expressed genes (DEGs) between adjacent developmental stages were identified and gene expression patterns were clustered. By GO term enrichment analysis, KEGG pathway enrichment analysis and functional gene profiling, the physiological changes during shrimp metamorphosis could be better understood, especially histogenesis, diet transition, muscle development and exoskeleton reconstruction. In conclusion, this is the first study that characterized the integrated transcriptomic profiles during early development of penaeid shrimp...

A ‘Simple Anterior Fish Excluder’ (SAFE) for Mitigating Penaeid-Trawl Bycatch

McHugh, Matthew J.; Broadhurst, Matt K.; Sterling, David J.; Millar, Russell B.
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica
Publicado em 02/04/2015 EN
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Various plastic strips and sheets (termed ‘simple anterior fish excluders’−SAFEs) were positioned across the openings of penaeid trawls in attempts at reducing the unwanted bycatches of small teleosts. Initially, three SAFEs (a single wire without, and with small and large plastic panels) were compared against a control (no SAFE) on paired beam trawls. All SAFEs maintained targeted Metapenaeus macleayi catches, while the largest plastic SAFE significantly reduced total bycatch by 51% and the numbers of Pomatomus saltatrix, Mugil cephalus and Herklotsichthys castelnaui by up to 58%. A redesigned SAFE (‘continuous plastic’) was subsequently tested (against a control) on paired otter trawls, significantly reducing total bycatch by 28% and P. saltatrix and H. castelnaui by up to 42%. The continuous-plastic SAFE also significantly reduced M. macleayi catches by ~7%, but this was explained by ~5% less wing-end spread, and could be simply negated through otter-board refinement. Further work is required to refine the tested SAFEs, and to quantify species-specific escape mechanisms. Nevertheless, the SAFE concept might represent an effective approach for improving penaeid-trawl selectivity.

The mtdna control region of the barba-ruça shrimp artemesia longinaris (decapoda:penaeidae) and Its potential use as a marker for population analysis

Dumont, Luiz Felipe Cestari; Hwang, Gyu-Lin; Maclean, Norman
Fonte: Universidade Federal do Rio Grande Publicador: Universidade Federal do Rio Grande
Tipo: Artigo de Revista Científica
ENG
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O camarão Artemesia longinaris é endêmico do Atlântico Sudoeste, sendo explorado comercialmente desde a Argentina (Puerto Rawson – 21o37’S) até o Sudeste do Brasil (Rio de Janeiro – 43o00’S). Marcadores moleculares, tais como a região controle do mtDNA (RC), tem sido usados para elucidar a estrutura filogeográfica de camarões peneídeos ao redor do mundo. A região controle do mtDNA foi testada como marcador molecular para estudos populacionais, na intenção de desenvolver um novo conjunto de primers para amplificar essa região. Os primers foram posicionados nos genes flanqueando a região controle, que apresentaram a mesma ordem reportada para outros peneídeos (12S no extremo 5’ e tRNAIle3 no extremo 3’). A RC de A. longinaris apresentou um tamanho de 990 pb, incluindo duas regiões hipervariáveis nos extremos 5’ e 3, com uma região central menos polimórfica. Adicionalmente, um primer interno, desenhado para amplificar aproximadamente 800 pb, da extremidade 5’ da região controle, incluindo a região hipervariável I, foi desenvolvido para estudos de estrutura populacional. A comparação das seqüências da região controle com as da COI demonstrou que a primeira apresenta maior grau de polimorfismo. A diversidade nucleotídica estimada para a região controle foi baixa (_=0...

White spot syndrome virus in wild penaeid shrimp caught in coastal and offshore waters in the southern Atlantic Ocean

Cavalli, Lissandra Souto; Nornberg, Bruna F??lix da Silva; Netto, Sergio Antonio; Poersch, Lu??s Henrique da Silva; Romano, Luis Alberto; Marins, Luis Fernando Fernandes; Abreu, Paulo Cesar Oliveira Vergne de
Fonte: Universidade Federal do Rio Grande Publicador: Universidade Federal do Rio Grande
Tipo: Artigo de Revista Científica
ENG
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White spot syndrome virus (WSSV) is a doublestranded rod-shaped DNA virus, which belongs to the family Nimaviridae, genus Whispovirus (Mayo 2002). Since its first appearance in 1992 (Chou et al. 1995), the disease has rapidly spread to different regions of the world with an economic impact approaching US$ 10 billion (OIE 2006). The first notification of WSSV in Brazil occurred in 2005 in Laguna???Santa Catarina, southern Brazil where the disease affected more than 1400 ha of shrimp ponds causing a production decline from 4189 tonnes in 2004 to 300 tonnes in 2007(Seiffert et al. 2006). Despite the lack of official records, it has been estimated that 90% of the shrimp industry in Santa Catarina collapsed in 2006 (Netto & Meurer 2006).In coastal waters of Brazil, there are no reports regarding the presence of WSSV in native wild shrimp. We therefore conducted research to evaluate the presence of WSSV in wild shrimps in the Laguna estuarine complex. In addition, wild shrimps were collected from offshore waters to evaluate the possible extent of virus dissemination. Thus, in February 2008, 750 wild juveniles of Farfantepenaeus paulensis (Pe??rez-Farfante) were captured in five sampling stations along the Laguna estuarine system (Fig. 1). One hundred and fifty Litopenaeus vannamei (Boone) were collected in a shrimp farm that operates a shrimp???tilapia polyculture. In addition...

Development of a spatial Decision Support System (DSS) for the Spencer Gulf penaeid prawn fishery South Australia

Carrick, N.; Ostendorf, B.
Fonte: Elsevier Sci Ltd Publicador: Elsevier Sci Ltd
Tipo: Artigo de Revista Científica
Publicado em //2007 EN
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The Spencer Gulf penaeid prawn fishery in South Australia has undergone a substantial increase in fishing efficiency (and profitability) mainly due to the implementation of adaptive harvest strategies requiring rapid response for change to harvesting plans. This paper describes the management background and the decision-making process leading to the development of a basic Decision Support System (DSS) that uses spatial information techniques and near real-time fishery-independent survey data. The system is implemented through linking an Oracle database to ArcGIS, Genstat and Splus. Two examples show the application of the DSS for optimal harvest timing and assessment of fishery sustainability. Fishery-independent survey data are used to assess stock and model population growth. The first example shows the information flow leading to a dynamic stock model and the estimate of value change as a function of harvest time. The second example shows how the DSS is used to validate and refine existing biological reference limits by evaluating long-term detailed data sets of the prawn population structure and catch dynamics. We conclude that it is important for the economic benefit and sustainability of the fishery to maintain and improve the collection of long-term data sets that are independent of commercial fishery statistics.; http://www.elsevier.com/wps/find/journaldescription.cws_home/422921/description#description; N.A. Carrick and B. Ostendorf; Copyright © 2005 Elsevier Ltd All rights reserved

Haemagglutination as a low-cost detection method for gill-associated virus and by inference, yellowhead virus in Penaeus monodon Fabricius, 1798

Munro, J.; Owens, L.
Fonte: Blackwell Science Ltd Publicador: Blackwell Science Ltd
Tipo: Artigo de Revista Científica
Publicado em //2005 EN
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A quantitative, low-cost test based on haemagglutination (HA) using chicken erythrocytes was developed to indicate the viral load of Australian yellowhead-like virus, gill-associated virus (GAV), in Penaeus monodon. The study tested the haemolymph, gill, lymphoid organ, heart, sub-cutaneous tissue, eye stalk, pleopods, uropods and the central nerve cord for agglutination activity in 100 prawns, with the haemolymph and gill tissue giving the highest end-point titres of 1:1370 and 1:361 respectively. The sensitivity of the test was demonstrated by testing two different populations of P. monodon, which showed a highly significant difference (P<0.001) in HA activity, indicating a difference in viral load. By testing three other penaeid prawn species (n=20), Penaeus esculentus, Penaeus merguiensis and Penaeus longistylis, and the crayfish Cherax quadricarinatus, it was demonstrated that natural agglutinins were not causing the high agglutination in the population of P. monodon being tested. It was also demonstrated that there was no effect of freezing and thawing of samples on HA activity. The speed and low cost of this test makes it a very useful tool, particularly in the developing world, for on-farm testing of penaeid prawns to indicate yellowhead virus and GAV loads which can contribute to management practices with respect to harvesting of ponds.; James Munro and Leigh Owens

Susceptibility of juvenile European lobster Homarus gammarus to shrimp products infected with high and low doses of white spot syndrome virus

Bateman, K.; Munro, J.; Uglow, B.; Small, H.; Stentiford, G.
Fonte: Inter-research Publicador: Inter-research
Tipo: Artigo de Revista Científica
Publicado em //2012 EN
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White spot syndrome virus (WSSV) is the most important pathogen known to affect the sustainability and growth of the global penaeid shrimp farming industry. Although most commonly associated with penaeid shrimp farmed in warm waters, WSSV is also able to infect, cause disease in and kill a wide range of other decapod crustaceans, including lobsters, from temperate regions. In 2005, the European Union imported US$500 million worth of raw frozen or cooked frozen commodity products, much of which originated in regions positive for white spot disease (WSD). The presence of WSSV within the UK food market was verified by means of nested PCR performed on samples collected from a small-scale survey of supermarket commodity shrimp. Passage trials using inoculum derived from commodity shrimp from supermarkets and delivered by injection to specific pathogen-free Pacific white shrimp Litopenaeus vannamei led to rapid mortality and pathognomonic signs of WSD in the shrimp, demonstrating that WSSV present within commodity shrimp was viable. We exposed a representative European decapod crustacean, the European lobster Homarus gammarus, to a single feeding of WSSV-positive, supermarket-derived commodity shrimp, and to positive control material (L. vannamei infected with a high dose of WSSV). These trials demonstrated that lobsters fed positive control (high dose) frozen raw products succumbed to WSD and displayed pathognomonic signs associated with the disease as determined by means of histology and transmission electron microscopy. Lobsters fed WSSV-positive...

Configuring the Mesh Size, Side Taper and Wing Depth of Penaeid Trawls to Reduce Environmental Impacts

Broadhurst, Matt K.; Sterling, David J.; Millar, Russell B.
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica
Publicado em 09/06/2014 EN
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The effects of reducing mesh size while concomitantly varying the side taper and wing depth of a generic penaeid-trawl body were investigated to improve engineering performance and minimize bycatch. Five trawl bodies (with the same codends) were tested across various environmental (e.g. depth and current) and biological (e.g. species and sizes) conditions. The first trawl body comprised 41-mm mesh and represented conventional designs (termed the ‘41 long deep-wing'), while the remaining trawl bodies were made from 32-mm mesh and differed only in their side tapers, and therefore length (i.e. 1N3B or ‘long’ and ∼28o to the tow direction vs 1N5B or ‘short’ and ∼35o) and wing depths (‘deep’–97 T vs ‘shallow’–60 T). There were incremental drag reductions (and therefore fuel savings – by up to 18 and 12% per h and ha trawled) associated with reducing twine area via either modification, and subsequently minimizing otter-board area in attempts to standardize spread. Side taper and wing depth had interactive and varied effects on species selectivity, but compared to the conventional 41 long deep-wing trawl, the 32 short shallow-wing trawl (i.e. the least twine area) reduced the total bycatch by 57% (attributed to more fish swimming forward and escaping). In most cases...

Biodiversity, distribution and abundance of shrimps Penaeoidea and Caridea communities in a region the vicinity of upwelling in Southeastern of Brazil

Silva,Evelyn Raposo da; Sancinetti,Gustavo Sérgio; Fransozo,Adilson; Azevedo,Alexandre; Costa,Rogerio Caetano da
Fonte: Sociedade Brasileira de Carcinologia Publicador: Sociedade Brasileira de Carcinologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2014 EN
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This study evaluated the spatial-temporal distribution of the abundance of Caridean and Penaeid shrimps during the period of two years in the coastal region of Macaé, state of Rio de Janeiro, southeastern Brazil, using ecological indices (Shannon-Wiener diversity and Pielou's equitability). Monthly samples were carried out from March 2008 to February 2010 distributed in six stations located Inner Area (5, 10 and 15 m depth) and Outer Area (25, 35 and 45 m depth) using a commercial fishery boat equipped with an otter-trawl net. Water samples were taken for determination of temperature and salinity, and sediment samples for determination of texture and organic matter content. Ten species of Decapoda, including Penaeids and Carideans, have been identified, from a total of 49.941 collected individuals. There was a strong correlation between Penaeid and Caridean shrimps abundance and the bottom temperature and sediment. It could be inferred that Artemesia longinaris acted as a keystone species regulating the shrimps community in the coast of Macaé, given that both species diversity and equitability were controlled by the migratory events of A. longinaris following the variations in temperature caused by the SACW. These results provide as a basis for management actions to prevent significant losses of population stocks since it is an important marine area considering of its peculiar relevance to the fishery.

Aquacultural importance of the integumental pore pattern in postlarval whiteleg shrimp Litopenaeus vannamei (Decapoda: Penaeidae)

Cabrera-Jiménez,Jorge Alberto
Fonte: Revista de Biología Tropical Publicador: Revista de Biología Tropical
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/09/2006 EN
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The analysis of integumental pore pattern has identified two intraspecific groups of postlarval shrimp Litopenaeus vannamei (Boone, 1931), a species of which three to five natural populations or groups are expected to be found from Mexico to Peru. Natural distribution and man-made redistributions have not been typified on a population basis in any penaeid, but it is important to do so in this commercially significant group. Important factors to be defined on a geographic population or group basis include differences in domesticity (eg resistance to pathological agents); food conversion indexes and food preferences; growth indices; tolerance to stress of various origins and other attributes useful in aquaculture. This consideration is valid not only for L. vannamei but also for any other shrimp species that has been the object of artificial redistribution. Rev. Biol. Trop. 54 (3): 707-709. Epub 2006 Sept. 29.

First report of penaeid (Crustacea, Decapoda, Penaeoidea) from the Lower Cretaceous (Albian) of the Tlayúa quarry, Tepexi de Rodríguez (Puebla, Central Mexico)

Garassino,Alessandro; Pasini,Giovanni; Vega,Francisco J.
Fonte: Sociedad Geológica Mexicana, A.C. Publicador: Sociedad Geológica Mexicana, A.C.
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/08/2013 EN
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The first penaeid from the Lower Cretaceous (Albian) of the Tlayúa quarry, Tepexi de Rodríguez (Puebla, Central Mexico) is here reported. The specimen has been tentatively assigned to the superfamily Penaeoidea Rafinesque-Schmaltz, 1815, for the lack of main diagnostic characters. Despite the incompleteness of the body, it is the second report of penaeid from the Lower Cretaceous of Mexico, increasing the scarce knowledge about the decapod assemblage of Tepexi de Rodríguez basin.