Abstract
This study aimed to evaluate the parasitic fauna of Opisthonema oglinum (Lesueur, 1818) from Southeastern Brazil. Between September 2017 and March 2018, a total of 100 specimens of O. oglinum from the Sepetiba Bay, Rio de Janeiro, Brazil (22°54'S, 43°34'W) were examined. Ninety one specimens of O. oglinum were parasitized by at least one species of metazoan with a mean of 5.84 ± 7.98 parasites/fish. Seven species were collected: 2 digeneans, 2 monogeneans, 2 copepods and 1 nematode. The digenean Parahemiurus merus (Linton) was the most abundant and dominant species, representing 43% of metazoan parasites collected. The parasite species richness was positively correlated with the total length of the hosts. Only Neobomolochus elongatus Cressey showed a positive correlation between host's total length and parasite prevalence. The mean parasite species diversity was not correlated with host's total length, but significant differences among the mean parasite diversity between males and females was observed. Opisthonema oglinum represents a new host record for Caligus mutabilis Wilson, Hysterothylacium sp. and Cribomazocraes travassosi Santos and Kohn. The copepod N. elongatus is recorded for the first time on the Brazilian coast.
Highlights
The Sepetiba Bay is considered one of the most important aquatic ecosystems in the state of Rio de Janeiro, presenting a considerable amount of organic input in suspension, dissolved salts and high concentration of planktonic algae which made their waters suitable for many marine species (Araújo et al, 1997, 1998). 418 418/423Around 97 species of fishes distributed in 70 genera and 38 families have been recorded in this bay, but with the increasing development of the industrial complex and population density in the region, some changes in water quality and local biota have been reported (Pfeiffer et al, 1985; Araújo et al, 1998).Braz
This study aimed to evaluate the parasitic fauna of Opisthonema oglinum (Lesueur, 1818) from Southeastern Brazil
The dominance of digenean endoparasites has been described for several parasite communities of marine fish from the coastal zone of southeastern Brazil (Luque et al, 1996, Takemoto et al, 1996, Knoff et al, 1997, Luque and Chaves, 1999; Silva et al, 2000; Luque and Alves, 2001; Tavares and Luque, 2004; Moreira et al, 2015)
Summary
The Sepetiba Bay is considered one of the most important aquatic ecosystems in the state of Rio de Janeiro, presenting a considerable amount of organic input in suspension, dissolved salts and high concentration of planktonic algae which made their waters suitable for many marine species (Araújo et al, 1997, 1998). 418 418/423Around 97 species of fishes distributed in 70 genera and 38 families have been recorded in this bay, but with the increasing development of the industrial complex and population density in the region, some changes in water quality and local biota have been reported (Pfeiffer et al, 1985; Araújo et al, 1998).Braz. Around 97 species of fishes distributed in 70 genera and 38 families have been recorded in this bay, but with the increasing development of the industrial complex and population density in the region, some changes in water quality and local biota have been reported (Pfeiffer et al, 1985; Araújo et al, 1998). The actinopterygians of the family Clupeidae have a considerable value to commercial fishery in many parts of the world. This family is represented by 197 species distributed in 55 genera around the world, most of these found in tropical regions, mainly in marine coastal zones and some in freshwater (Nelson, 2006; Froese and Pauly, 2019)
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