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Ensenada, Mexico

Caceres-Martinez J.,Research Center Cientifica y | Vasquez-Yeomans R.,Institute Sanidad Acuicola | Padilla-Lardizabal G.,Comite Estatal de Sanidad Acuicola del Estado de Nayarit
Journal of Aquatic Animal Health | Year: 2010

The pleasure oyster Crassostrea corteziensis is collected and cultured in Nayarit on the Pacific coast of Mexico, and the improvement and promotion of its culture are seen as a possible source for the economic development of coastal populations. However, information about the parasite fauna of the pleasure oyster is almost completely lacking. A histopathological survey carried out in two estuaries, Boca del Camichín and Pozo Chino, revealed the presence of hypertrophied gametes, rickettsiales-like prokaryotes (RLPs), the protozoan Perkinsus marinus, a protozoan Nematopsis sp., Ancistrocoma-like ciliates (ALCs), Sphenophrya-like ciliates, a turbellarian Urastoma sp., and encysted crustaceans. In general, prevalence and intensity of parasites were similar in both localities except that ALCs and encysted crustaceans were more prevalent in Pozo Chino than in Boca del Camichín. Perkinsus marinus and RLPs seem to represent a more significant risk for the health of pleasure oysters than do the other parasites, and surveillance and control of these parasites are needed for the development of pleasure oyster culture. © Copyright by the American Fisheries Society 2010.

Cruz-Flores R.,CICESE | Caceres-Martinez J.,CICESE | Caceres-Martinez J.,Institute Sanidad Acuicola
Journal of Invertebrate Pathology | Year: 2016

Transmission electron microscopy analysis (TEM) of the rickettsiales-like prokaryote, Candidatus Xenohaliotis californiensis (CXc), pathogen of Haliotis spp. from the West Coast of North America, were found to be infected by a bacteriophage hyperparasite previously described in red abalone from California. The hyperparasite has an icosahedrical-like capsid with a narrow long flexible tail, this morphological characteristic tentatively place this virus in the Family Siphoviridae from the order Caudovirales. TEM images also showed the bacteriophage in different stages of assembly in the cytoplasm of CXc, demonstrating its lytic cycle. © 2015 Elsevier Inc.

Caceres-Martinez J.,CICESE | Caceres-Martinez J.,Institute Sanidad Acuicola | Ortega M.G.,Institute Sanidad Acuicola | Vasquez-Yeomans R.,Institute Sanidad Acuicola | And 3 more authors.
Journal of Invertebrate Pathology | Year: 2012

The mangrove oyster . Saccostrea palmula coexists with the pleasure oyster . Crassostrea corteziensis in coastal lagoons of northwest Mexico. Recent discovery of . Perkinsus marinus infecting the pleasure oyster in the region prompted evaluation of . S. palmula as an alternative . P. marinus host. An analysis to determine the possible presence of . P. marinus in natural and cultured populations of . S. palmula at four coastal lagoons in Sinaloa, Mexico was carried out during October-November 2010. Tissues from apparently healthy . S. palmula were evaluated using Ray's fluid thioglycollate method (RFTM), which revealed a . Perkinsus sp. to be present in all four locations at 6.7-20.0% prevalence. Histopathological analysis of these specimens showed tissue alterations and parasite forms consistent with moderate . P. marinus infection, which was confirmed by ribosomal non-transcribed spacer (NTS)-based PCR assays on DNA samples from oysters positive by RFTM and histology. DNA sequencing of amplified NTS fragments (307. bp) produced a sequence 98-100% similar to GenBank-deposited sequences of the NTS from . P. marinus. Fluorescent . in situ hybridization for . Perkinsus spp. and . P. marinus corroborated the PCR results, showing clear hybridization of . P. marinus in host tissues. This is the first record of . P. marinus infecting a species from genus . Saccostrea and the first record of the parasite from coastal lagoons in Sinaloa, Mexico. © 2012 Elsevier Inc..

Caceres-Martinez J.,Research Center Cientifica Educacion Superior Of Ensenada | Caceres-Martinez J.,Institute Sanidad Acuicola | Vasquez-Yeomans R.,Institute Sanidad Acuicola | Cruz-Flores R.,Research Center Cientifica Educacion Superior Of Ensenada
Journal of Shellfish Research | Year: 2015

The Pacific geoduck Panopea generosa is distributed along the Pacific coast of the peninsula of Baja California, Mexico. Because of its high market value, this species has been under an intensive fishery pressure during the last few years, whereas its experimental aquaculture production is still developing. The fishery and culture practices point to the movement of clams as a risk factor for dispersion of symbionts, parasites, and diseases. Wild geoduck clams from fishery captures are sent to facilities that maintain clams alive, before marketing. Some of them show external abnormalities such as weakness and flaccidity, blisters, and darkening and thickening of the mantle surface and siphon. The objective of this study was to determinate if these abnormalities were related to parasites or diseases through conventional parasitological and histological analyses. The parasitological analysis showed two species of copepods, Pseudomyicola spinosus and a calanoid species in the mantle cavity and gills; additionally, a turbellarian species was also observed in the mantle cavity, none of these symbionts were related to tissue damage. The histological analysis showed that some weak-flaccid clams were in a postspawning condition. The dark and thick areas of the siphon and mantle suffered a dramatic transformation of the periostracum into a cavernous structure with numerous protozoans in different developmental stages. Fungi were occasionally observed in the external area of the periostracum. Unusual mortalities were reported by producers in clams with this abnormality. Rickettsia-like inclusions and trematodes were found in the digestive gland associated with limited damage to the host. The darkening and thickening of the siphon represent a major issue because of the negative appearance of the clams, which prevents its sale and is possibly related to the unusual mortality episodes. Detailed field and laboratory studies are needed to determine the origin of this pathology as well as its distribution and effect on the survival of the host. Moreover, field studies on the distribution, prevalence, and intensity of the other symbionts and parasites here detected are needed. These data constitute the first record for organisms associated with P. generosa in Mexico and a baseline for future studies.

Caceres-Martinez J.,Research Center Cientifica | Caceres-Martinez J.,Institute Sanidad Acuicola | Vasquez-Yeomans R.,Institute Sanidad Acuicola | Guerrero-Renteria Y.,Research Center Cientifica
Hidrobiologica | Year: 2012

The Kumamoto oyster, Crassostrea sikamea, starts gametogenesis as young as 71 days old from spawning (35 days from postsettlement) with a mean shell height of 3.0 mm. This information constitutes a new record in age-size for gametogenesis in oysters for commercial importance and adds another biological difference comparing this species with the Pacific oyster Crassostrea gigas.

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