Abstract
From September 2014 to November 2015, 30 Paralichthys orbignyanus specimens were obtained from Sepetiba Bay in the municipality of Rio de Janeiro, State of Rio de Janeiro, Brazil. The fishes were necropsied and cestode larvae were recovered from the abdominal cavity, mesentery, and serosas of the stomach, intestine, spleen, liver, kidney and gonads. Nineteen fish were parasitized by a total of 90 trypanorhynch plerocerci. Based on morphological characters, these were identified as Pterobothrium crassicolle. The parasitism indices for P. crassicolle on P. orbignyanus, were 63.3% for prevalence, 4.7 for mean intensity, 3 for mean abundance and 1 to 18 for range of infection. These parasites were studied due to their importance during fish sanitary inspection, if one considers the harm that the repulsive aspect of infected fish may cause to consumers. This is the first record of P. crassicolle plerocerci parasitizing P. orbignyanus.
Highlights
The flounder species Paralichthys orbignyanus (Valenciennes, 1839), lives in water that ranges from shallow to just over 20 m deep, and enters coastal lagoons from Rio de Janeiro, Brazil to Mar del Plata, Argentina
Pterobothrium crassicolle has been reported in several teleost fish worldwide (Bates 1990, Palm 2004, Palm and Bray 2014)
In Brazil, there are a number of records of this species in teleosts (Porto et al 2009, Felizardo et al 2010, Silva Júnior 2010, Dias et al 2011, Fonseca et al 2012, Videira et al 2013, Zuchinalli et al 2016), but this is the first record of P. crassicolle plerocercus parasitizing P. orbignyanus
Summary
The flounder species Paralichthys orbignyanus (Valenciennes, 1839), lives in water that ranges from shallow to just over 20 m deep, and enters coastal lagoons from Rio de Janeiro, Brazil to Mar del Plata, Argentina. It feeds on pelagic and benthic species of crustaceans, reaches average length of 32. Trypanorhynch cestodes in terms of fish sanitary inspection because of their repugnant appearance. According to the Brazilian Industrial and Sanitary Inspection of Products of Animal Origin Regulation, it is considered unsafe to eat the fish with massive muscle infestation by parasites, including those caused by trypanorhynch cestodes (Brasil 1952). It is common to encounter high rates of infection in the muscles, reinforcing the importance of conducting inspections for cestodes in a wide variety of teleost fish (Dollfus 1942, Amato et al 1990, Pereira Jr 1993, São Clemente et al 1995, 1997)
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