Figura 2 - uploaded by Sergio R. Martorelli
Content may be subject to copyright.
Pleoticus muelleri. Apostomados sobre filamentos branquiales. Escala 0.025 mm Figura 3 Pleoticus muelleri, aspecto de una branquia con melanización debida a la presencia de apostomados. Escala 0.050 mm
Source publication
Resumen Pleoticus muelleri es uno de los camarones más explotados comercialmente en Argentina, distribuido desde los 22° 00' S (Río de Janeiro, Brasil) hasta el norte de la Patagonia 49° 45', y sobre el cual se han realizado numerosos trabajos en vista a su empleo en acuicultura. Los simbiontes de este camarón no están completamente estudiados o co...
Citations
... Metacestodos de este tipo parasitan el intestino de F. brasiliensis, F. aztecus, F. duorarum, L. setiferus [11,13] y de otros crustáceos, tales como los langostinos Pleoticus muelleri y Artemesia longinaris [18] y el del cangrejo Macropitus depuratur. Sin embargo, la metacestodo de este estudio presenta 9 __________________________________________________________________Revista Científica, FCV-LUZ / Vol. ...
... Los valores registrados de IIM (TABLA III) de este metacestodo son los primeros en estas especies de camarones de Venezuela e indican que los camarones capturados en Unare -Píritu están entre ligera a moderadamente parasitados, mientras que los camarones capturados en el golfo de Paria están de general a altamente infectados [33]. Aunque no se registraron valores superiores a 120 Ind./camarón, existen informes que frecuentemente un camarón puede albergar más de 1.000 metacestodos intestinales y podrían causarle obstrucción intestinal [11,18,23]. ...
The penaeids shrimps species: Farfantepenaues brasiliensis,
F. notialis, F. subtilis and Litopenaeus schmitti from the northeastern
region of Venezuela were examined for metacestodes
parasites. It was determined the mean intensity of infection
(IIM) and prevalence (P). Two types of metacestodes: the metacestodes
Lecanicephallidae found in midgut and the metacestodes
type Polypocephalus in nerve periopod were identified.
A total of 1370 shrimps, 36.4% were parasitized by intestinal
lecanicephalids Lecanicephallidae. The shrimps from the
Gulf of Cariaco with total length (Lt). between 60 – 89 mm,
showed higher values of IIM and Pv. For the Gulf of Paria the
shrimps with Lt. between 90 – 120 mm had IIM and Pv higher.
The samples of L. schmitti from the Gulf of Paria had values of
Pv higher statistically significant difference with that of other areas
(Piritu beach, lake of Unare and Gulf of Cariaco) Z = 4.6, �
= 0.01, and the species with the highest value of Pv and statistically
different was F. subtilis (P<0.01) and followed by L.
schmitti, F brasiliensis and F. notialis. The area that presented
higher Pv was Paria (P<0.01). Shrimp captured in zones of water
with salinity between 10 to 25 ups showed higher values of
IIM and Pv. The histological analysis of mid gut parasited
showed that to parasite adherence to the epithelium of the intestinal
mucosa causing loss of peritrophic membrane, detachment
of brush border o microvillus and detached sections of
the epithelial layer. In a few cases the area affected showed
abundant granulocyte and dilated capillaries.
... Otros países como Colombia, Venezuela y Perú que también tienen un gran potencial, están incursionando en este rubro y avanzando rápidamente. Este es el caso de Argentina, país en el que existen especies excelentes para el desarrollo de esta actividad a pesar de estar actualmente en una etapa incipiente (Fenucci et al., 2002, Martinez et al., 2008 Pleoticus muelleri Bate es uno de los crustáceos decápodos más explotados comercialmente en toda la costa del Mar Argentino y sobre el cual se están llevando a cabo estudios con miras a su utilización en acuicultura (Martorelli, 2002;Harán et al., 2004, Mallo y Fenucci, 2004. ...
Trade in aquatic animals calls for the implementation of controls for the detection of pathogenic viruses in line with the regulations of the OIE, the World Organization for Animal Heath. In relation specifically to trade in crustaceans, the OIE identifies the following diseases: White Spot syndrome virus disease (WSSV); Yellow Head Virus disease (YHV); and Taura syndrome virus disease (TSV), all of which are highly dangerous. The purpose of this study was to determine whether these viruses occur in wild populations of Pleoticus muelleri in Bahía Blanca estuary, Argentina, using biochemical, molecular biology and genetics methods. The results show that the methods used for DNA and RNA extraction and purification from the tissue and hemolymph of these crustaceans, and the techniques for their capture, packaging and transportation to the laboratory have been optimized. Tests were properly validated by negative and positive controls. None of the named diseases were found in the wild populations of Pleoticus muelleri. The methodology followed in the present research not only enables early detection and diagnosis of the three viral pathologies but also ensures an infection-free status with the concomitant health benefits for the region.
... Higgins (1968) revisited this locality, redescribed this species from topotype specimens and reported it from an additional locality in the vicinity of Ubatuba, Brazil. Martorelli (2002) reported kinorhynchs in the gut of Pleoticus muelleri and these are the subject of this paper. ...
Six kinorhynchs were found in the stomachs of the Argentine red shrimp, Pleoticus mulleri (Bate, 1888) from the Argentine coast of Patagonia. Three new species are described: Condyloderes storchi n. sp., Pycnophyes argentinensis n. sp. and P. neuhausi n. sp. A fourth species, Kinorhynchus anomalus Lang, 1953 was previously known only from the coast of Chile. This is the third known record of kinorhynchs documented as a food source. Condyloderes storchi, n. sp. is the fourth new species in this genus. It is distinguished by its paradorsal cuspidate spines on segments 7 and 9, lateral accessory and ventrolateral spines on segments 3, 6, 7, 10 and 11. P. argentinensis, n. sp. has nearly equal sternal width for segments 3–11 (about 7% of the trunk length), episternal plates with three distinct areas along the anterior margin, mid-sternal plate with even margin, mid-dorsal spinose protrusions along the terminal borders of segments 11 and 12, and lateral terminal spines 176μm long, about 21% of trunk length. P. neuhausi, n. sp.has a prominent posterior elongation of the tergal plate of segment 3, uneven lateral margins of the mid-sternal plate, a maximum sternal width at segment 3, no mid-dorsal spinose processes and mid-ventral thickenings on segments 10–12.
In total 374 specimens corresponding to four species of shrimp: Artemesia longinaris, Pleoticus muelleri, Peisos petrunkevitchii, Palaemon macrodactylus, and two species of crabs: Neohelice granulata and Cyrtograpsus angulatus were studied in the search of white spot syndrome virus (WSSV). The crustaceans were collected in the estuary of Bahia Blanca, the port of Mar del Plata and the Samborombón Bay, Argentina, between 2010 and 2014. A polymerase chain reaction (PCR) analysis in all of them has not detected any virus presence. These new results suggest that the discovery of infected shrimp in 2008-09 in the Bahia Blanca estuary may have been a one-time local event, promoted by special conditions of seawater temperature inside the estuary, coincident with the presence of a virus carrier or transporter. To determine if the virus was finally installed in the estuary of Bahia Blanca more screening are needed coming from a larger number of shrimp samples. These studies will be necessary mainly in A. longinaris (Penaeidae) since this family of shrimps is most susceptible to be affected by WSSV.
The marine nematodes usually comprise free-living species, although a few are parasitic. However, several cases of free-living nematodes found accidentally in the digestive tract of certain vertebrates, especially fishes, have sometimes been recorded and categorized as pseudoparasites. In the present work, two species of marine fishes, the rhomboid crappie, Diapterus rhombeus, and the silvered crappie, Eucinostomus argenteus (Perciformes: Gerreidae), from Angra dos Reis on the coast of Rio de Janeiro (Brazil) were examined. Seven species of free-living marine nematodes were found in the digestive tract of these fish. Several of these species remain unknown as free-living forms in Brazil. The combination of the fish feeding strategies and the poor preservation of the body of the nematode specimens found could indicate that these nematodes are pseudoparasites, appearing in the fishes' digestive tracts through accidental ingestion and thereafter surviving for brief periods of time. Descriptions, illustrations and tables of measurements are provided for all species. Six of these species (Croconema torquens, Dorylaimopsis pellucida, Oncholaimellus labiatus, Parodontophora breviamphida, Prooncholaimus ornatus, Trissonchulus latus) have been reported for the first time from the Brazilian coast.
