Abstract
In November 2014 and May 2015, a total of 44 specimens of the South American silver croaker Plagioscion squamosissimus were collected: 30 in Marajó Bay and 14 in the Tapajós River, state of Pará, Brazil. The aim was to investigate the presence of anisakid nematodes and determine their parasitism indices and sites of infection, because of their importance regarding health inspection. Sixty-nine Anisakis sp. larvae were found; among them, 16 larvae in seven fish collected in Marajó Bay and 53 larvae in four fish in the Tapajós River. The parasitism indices of the nematodes collected from the fish in Marajó Bay comprised prevalence (P) of 23%, mean infection intensity (MI) of 2.28, mean abundance (MA) of 0.53, range of infection (RI) of 1-4, and infection site (IS) in the mesentery. The fish from the Tapajós River showed P = 28%, MI = 13.2, MA = 3.8, RI = 1-22, and IS = mesentery and intestine. To assist in taxonomic identification, images of the specimens obtained through optical microscopy with Nomarski's interferential contrast system and scanning electron microscopy were used. This is the first record of Anisakis sp. parasitizing P. squamosissimus.
Highlights
Plagioscion squamosissimus (Heckel, 1840) is a sciaenid fish commonly known as the South American silver croaker
This study aimed to investigate the presence of larval stages of anisakid nematodes in P. squamosissimus collected in Marajó Bay, in the municipality of Belém, and in the Tapajós River, municipality of Santarém, both in the state of Pará, Brazil, and to determine their parasitism indices and infection sites
The presence of larval stages of Anisakis sp. parasitizing P. squamosissimus confirms this environmental intersection of salinities, given the hosts used by the four larval stages within the life cycle of Anisakis species, within the eggs (L1-L3) and subsequently in intermediate and paratenic hosts (L3), and as pre-adults (L4) and adults in the cetacean final hosts (KLIMPEL & PALM, 2011)
Summary
Plagioscion squamosissimus (Heckel, 1840) is a sciaenid fish commonly known as the South American silver croaker. In South America, it occurs in many countries basins: Amazon, Orinoco, Paraná, Paraguay, and São Francisco River basins and rivers of Guianas (CASATTI, 2003). This fish is considered to be of high commercial importance in northern Brazil, i.e. in the lower Amazon region, including the city of Santarém, state of Pará, and on the coast of the state of Amapá and in indentations of the states of Maranhão and Pará (FERREIRA et al, 1998; CAMARGO & ISSAC, 2001; MELO et al, 2014). In Brazil, there are many records of helminth parasites in this host, including anisakid species (MARTINS et al, 2000; TAVARES et al, 2007; EIRAS et al, 2010; DIAS et al, 2011; MELO et al, 2014; RODRIGUES et al, 2015)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
