Pathologies in commercial bivalve species from Santa Catarina State, southern Brazil

Abstract

A survey on esophageal cancer exposure from 1995 to 1997 was carried at the radiother-apy service of the Charity Hospital in Florianopolis city, capital of Santa Catarina State, southern region of Brazil. From a total of 2,495 medical registers, 134 cases were of esophageal cancer affecting 80.5% of males and only 19.5% of females. Most of the patients were from the South and West regions of Santa Catarina (28 and 27%, respectively), regions of high corn flour consumption and maize production. It was observed that farmers presented the highest incidence of esophageal cancer, followed by bricklayers, miners, drivers, and carpenters. Most of the patients had the habit of smoking and drinking alcohol regularly, and 27% of patients used to drink chimarrao. Some patients had those habits associated i.e., they used to smoke, drink alcohol, and also have chimarrdo.

Parasites of economically important bivalves from the southern coast of Bahia State, Brazil

“…With respect to the RLOs found in both species, the site of infection in the host (the digestive gland), the localized effect, and the absence of a hemocyte response converge with results from recent studies conducted by Da Silva et al (2011) and Sabry et al (2011) on C. rhizophorae and C. gigas (Thunberg, 1793) in Santa Catarina state, and by Boehs et al (2010) and Ceuta and Boehs (2012) on M. guyanensis in Bahia state. Except for the study by Sabry et al (2011), who identified prevalences of up to 30% for C. gigas (coinciding with the results of this study for M. guyanensis collected at Canavieiras, in February 2010), other studies have indicated a low prevalence of these bacteria.…”

“…has been reported to use different species of bivalves as an intermediate host (NASCIMENTO et al, 1986;MAGALHÃES, 2004;MAGALHÃES, 2005;SABRY et al, 2007;BOEHS et al, 2010;DA SILVA et al, 2011;. According to Lauckner (1983), this cestode completes its life cycle in elasmobranchs, and is more common in tropical and subtropical regions.…”

Health assessment of the oyster Crassostrea rhizophorae on the southern coast of Bahia, northeastern Brazil

“…The horseshoe-shaped basophile nucleus was similar to previous observations for other host species, with varying prevalences MAGALHÃES, 2004;PONTINHA, 2009;DA SILVA et al, 2011;SABRY et al, 2011). There are indications that localities with high levels of organic pollution have increased the abundance of this ciliate, and accordingly some investigators believe that it has potential for use as a bioindicator (MARCOGLIESE; CONE, 1997;DOBBERSTEIN, 1999;OGUT;PALM, 2005;AKŞIT et al, 2008).…”

“…Rickettsia-like organisms (RLOs) have been previously observed in the digestive epithelial cells of several species of bivalves from the Brazilian coast: the mussel M. guyanensis (BOEHS et al, 2010; and the oysters C. rhizophorae SABRY et al, 2011;ZEIDAN et al, 2012) and Crassostrea gigas (Thunberg, 1793) (PONTINHA, 2009;DA SILVA et al, 2011), with similar low prevalences (except for SABRY et al, 2011, who observed a prevalence of up to 30%) and low infection intensities, without causing disease, as reported in a review by Bower et al (1994) for oysters in general. These organisms can also be found, apart from digestive tubules (primary and secondary, as recorded in the present study) in the epithelium of the intestine and stomach (CÁCERES-MARTÍNEZ et al, 2010), as reported by Sabry et al (2011), who observed changes in the gastric epithelium affected.…”

“…On the Brazilian coast, the main pathogens recorded in bivalve mollusks include bacteria, protozoans, fungi and others FERREIRA, 2006;BOEHS et al, 2012). The bacterial Rickettsialike organisms (RLOs) occur in several bivalves (PONTINHA, 2009;BOEHS et al, 2010;DA SILVA et al, 2011;SABRY et al, 2011;. The review by Boehs et al (2012) listed protozoans of phyla Ciliophora, Apicomplexa, Perkinsozoa and Microspora, and metazoan parasites of the groups Turbellaria, Digenea, Cestoda, Polychaeta, Pinnotheridae and Copepoda.…”