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2009 - Metazoan and protozoan parasites of freshwater ornamental fish - Tavares-Dias et al., 2009, Notas de estudo de Ciências Biologicas

Metazoan and protozoan parasites of freshwater ornamental fish from Brazil

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2012

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Baixe 2009 - Metazoan and protozoan parasites of freshwater ornamental fish - Tavares-Dias et al., 2009 e outras Notas de estudo em PDF para Ciências Biologicas, somente na Docsity! Manejo e Sanidade de Peixes em Cultivo Tavares-Dias, M. (Organizador) © 2009 Embrapa Amapá, Macapá. 469 Capítulo 19 Metazoan and protozoan parasites of freshwater ornamental fish from Brazil Marcos Tavares-Dias, Jefferson Raphael Gonzaga Lemos, Maurício Laterça Martins & Gabriela Tomas Jerônimo Resumo Anualmente, 27 milhões de peixes ornamentais de água doce são exportados do Brasil para o comércio internacional, principalmente para os Estados Unidos e Europa. A maioria destes peixes é proveniente da bacia amazônica, principalmente dos estados do Amazonas (25 milhões/ano) e Pará (1 milhão/ano) e somente uma pequena parte destes peixes é originária de cultivo. Dezenas de espécies são exportadas do Brasil, sendo Paracheirodon axelrodi (18 milhões/ano) a principal espécie, seguido por Otocinclus affinis (1,4 milhões/ano), Hemigrammus bleheri (1,1 milhões/ano) e Paracheirodon simulans (0,88 milhões/ano). Peixes ornamentais exportados do Brasil apresentam parasitos normalmente também encontrados em hospedeiros de outros países. Infecções parasitárias representam importante desafio para produtores de peixes ornamentais. Neste sentido, baixo número de parasitos pode evoluir para número indesejável e perigoso comprometendo a saúde do peixe. Abstract Annually, 27 million of freshwater ornamental fish have been exported from Brazil for international trade, mainly to the United States and Europe. Most of these fish are originated from Amazonian basin, especially from the states of Amazonas (25.0 million/year) and Pará (1.0 million/year). Small quantity of these fish is from culture. Paracheirodon axelrodi (18 million/year) is the main fish exported, followed by Otocinclus affinis (1.4 million/year), Hemigrammus bleheri (1.1 million/year) and Paracheirodon simulans (0.88 million/year). Ornamental fish exported from Brazil have parasites that are also reported in hosts from the other countries. Parasitic infections represent an important challenge for commercial suppliers of ornamental fish. On this view, low number of parasites may evolve to undesirable and dangerous number compromising the fish health. Tavares-Dias et al. Metazoan and protozoan parasites… 470 Introduction The ornamental fish hobbyist has experienced an increase in world popularity since the 1990s. This hobby is a multi-million dollar industry, and the United States of America is considered the largest market for ornamental organisms. Hence, increased demand for ornamental fish by the aquarists from the United States of America, United Kingdom, Japan, Germany, Italy and Belgium has been responsible for development of the activity. Over the last ten years the value of global exports of ornamental fish has averaged over US$ 183 million/year (Prang, 2007). Nowadays, most of the ornamental fish are produced in captivity (90%), and only 10% is wild fish. The world’s ornamental fish is growing due to the production and importation of several species from different continents especially from Asia and South America. Singapore is the principal ornamental fish exporter over the world (Prang, 2007; Ribeiro, 2008). However, a great number of aquarium fish are from the Amazonian Basin (Brazil, Colombia and Peru) in which is an important source of economic resources. Colombia is the largest exporter of South America, with exportation of 25 million of ornamental fish/year, generating an income of US$ 7 million (Ribeiro, 2008). Since 2006, Brazil has exported about 28 million of freshwater ornamental fish/year, which generated an income of about US$ 6 million/year (Figure 1). Ornamental fish are collected in eight Brazilian States. However, only the Amazonas State contributes with 64.0% of export production and Pará State with 26.0% (Figure 2). Part of freshwater ornamental fish exported from Pará State is collected in Amapá State. Nevertheless, the quantity of fish species collected in Amapá is still ignored by the Brazilian government that controls the exploration of ornamental fish. Ornamental fish from Amazonas State are exported to Germany, Netherlands, France, Belgium, UK and USA (Prang, 2007). Since 2006, Amazonas has exported 25.2 million fish/year with an income of US$ 3.7 million/year (Figure 2). However, the potential of exportation of freshwater ornamental fish is probably much higher than that currently practiced in the Brazilian Amazonia (Prang, 2007). Selection of fish species is a result of demand for fish highly colorful must be maintained when fed in aquarium. The last point is the choice of imported fish species. Ornamental fish exported from Amazonas State belong to 25 families with 130-140 fish species highly colorful (Table 1). The main fish species are shown in Table 1. There are 800 species documented for Rio Negro basin (Chao et al., 2001), but only 70 fish species from the basin are currently permitted for exportation (Prang, 2007). Barcelos Municipality is responsible for 67.8% ornamental fish exported from the Amazonas State (Chao et al., 2001). This basin is the largest area of ornamental fish capture and Paracheirodon axelrodi represents 70.0% of the total exported fish (Table 1). Other important species include the marbled hatchetfish Carnigiella strigata, blackwing hatchetfish C. martae, brown pencilfish Nannostomus eques, oneline pencilfish Nannostomus unifasciatus, Loricariid Ancistrus hoplogenys, rosy tetra Hyphessobrycon copelandi, catfish Dianema urostriatum, dwarf sucker Otocinclus sp., Apistogramma sp., angelfish Pterophyllum scalare, discus Symphysodon sp., Hemigrammus microstomus and catfishes Corydoras sp. Tavares-Dias et al. Metazoan and protozoan parasites… 473 Ornamental fish parasites from rivers at the Brazilian Amazonia A great quantity of good quality fish exported is the challenge to aquarium industry. Higher mortality has been registered from capture and transport of ornamental fish induced by stress (Waichman et al., 2001). Not only good water quality but also adequate handlings are practices that must be adapted for the activity. Water quality monitoring to reduce stress and fish mortality is the main factor to be thought. Low water quality observed during transport and the lack of basic care result in reduced fish health status (Waichman et al., 2001). The introduction of ornamental fish without quarantine can cause trouble for importation country with consequent economic losses (Kim et al., 2002). Parasitism in fish occurs normally in the native environment in a great diversity of parasites comparing to cultured fish (Moraes & Martins, 2004). Fish in the nature inhabit with parasites successfully (Roberts, 1981) by the fact that nutritional and physiological aspects are maintained (Andrade et al., 2001). When fish are exposed to different conditions the relation host/parasite/environment is broken especially due to water quality, stocking density and other stressor effects (Molnár, 1994; Moraes & Martins, 2004). Thus, it is important to study the causative agents of disease in ornamental fish (Martins et al., 2001). To success of fish transport the environment must be free of noxious factors that may cause a decrease in fish resistance. It is necessary to evaluate the main factors responsible for compromise the activity. Up to now, in Brazilian Amazonia, only 54 parasite species of seven zoological groups are known (Figure 3). These parasites have been reported, mainly, in fish species of the genera Ancistrus (Matos et al., 1998; Thatcher, 2006), Carnegiella, Corydoras, Hemigrammus, Hyphessobrycon, Poecilia, Xiphophorus, Carassis auratus, Astronotus ocellatus (Thatcher, 2006) and Gasteropelecus sternicla (São Clemente et al., 2000). However, as has a great number of Amazon ornamental fish species known and only some few fish were studied, hence many parasites species must be described yet. Studies on P. axelrodi, S. discus, H. erythrostigma, Ancistrus sp., Corydoras robinae, C. burguessi and C. adolfoi from the Barcelos area, Negro River basin before they were sent to the exporters in Manaus (Amazonas State, Brazil), have registered the occurrence of protozoans Chilodonella sp., Trichodina sp. and Piscinoodinium pilullare, Monogenoidea and bacteria (Ferraz, 1999). In general, these occurrences of multiple parasitic infections are associated to inadequate handling, poor water quality, and high stocking density during the transport, as well as long periods of time without feeding. This knowledge is important to avoid alterations on fishe’s health status, since a diagnosis of an epidemiological and sanitary situations are necessary to avoid the dissemination of parasites to other municipalities. Tavares-Dias et al. Metazoan and protozoan parasites… 474 32 6 5 5 1 1 4 0 10 20 30 40 M on og en oi de a N em at od a Br an ch iu ra Is op od a C op ep od a M yx oz oa Pr ot oz oa S p e ci e s N u m b e rs Figure 3. Number of parasite species described in ornamental fish species from Brazilian Amazonia Parasites in five ornamental fish species kept in exporter’s holding facilities from Amazonas State Specimens of Dianema urostriatum (6.5 ± 1.3 cm and 6.0 ± 2.0 g), Hyphessobrycon copelandi (3.0 ± 0.7 cm and 0.7 ± 0.5 g), Otocinclus sp. (3.3 ± 0.5 cm and 0.9 ± 0.6 g), Apistogramma sp. (3.4 ± 0.5 cm and 0.9 ± 0.4 g) and Paracheirodon axelrodi (2.5 ± 0.2 cm and 0.3 ± 0.1 g) were collected from tanks of an exporter from Manaus municipality, Amazonas State, Brazil. In this chapter, we assumed that mean relative dominance is the total number of parasites of each species divided by total number of parasites of all parasite species found (Rhode et al., 1995), prevalence is the number of parasitized fish divided by examined fish.100, and the mean intensity of infection is the total number of each parasite divided by parasitized fish (Bush et al., 1997). These fish were kept in a density of 3,500 fish/m3 and feed twice a day with an ornamental fish prepared ration containing 36.0% of crude protein. Upon their arrival at the exporter, the fish were submitted to treatments prophylactic with formalin and tetracycline. Moreover, fish were fed with a ration containing ivermectin. Every seven days a prophylaxis with these chemotherapeutants was carried out in the tanks. Fish that had arrived at the exporter and fish that maintained in tanks for seven days up to one year were treated. Physical-chemistry parameters of water quality from the exporter’s holding facilities tanks from Manaus (AM) are shown on Figure 4. The Tavares-Dias et al. Metazoan and protozoan parasites… 475 reported values are within the acceptable range for tropical fish health maintenance and production. From a total of 218 fish submitted to necropsy, parasites were found in 132 (60.5%). In D. urostriatum, P. axelrodi, H. copelandi, Otocinclus sp. and Apistogramma sp., parasite prevalence was 60.5%, with the of Ichthyophthirius multifiliis Fouquet 1876, Trichodina Ehrenberg, 1838, Henneguya Thelohan, 1892, Piscinoodinium pilullare (Shäperclaus, 1954) Lom, 1981, Monogenoidea, Nematoda adult, Nematoda larvae, Digenea adult, Digenea metacercariae and Hirudinea Placobdella Blanchard 1893 (Table 2). Prevalence and intensity of I. multifiliis on the gills of P. axelrodi, H. copelandi and D. urostriatum were similar, but was not found in Otocinclus sp. and Apistogramma sp. (Table 3). Dinoflagellate P. pilullare (called as velvet disease) was only observed on the gills of P. axelrodi and H. copelandi (Table 4), whereas Trichodina sp. varied from 2 to 30 parasites per host in Otocinclus sp (Table 5). Monogenoidea parasites were present in all species with the lowest prevalence in Apistogramma sp. and the highest in P. axelrodi and D. urostriatum. However, H. copelandi and Apistogramma sp showed the lowest mean intensity of gill parasites (Table 6). The mean intensity of Monogenoidea was higher in D. urostriatum (8.2) and Otocinclus sp. (11.5) than that related in the other fish species (Table 6). The lowest prevalence and intensity of adults Nematoda were observed in the intestines of D. urostriatum and the highest in P. axelrodi and Apistogramma sp. (Table 7). In addition, nematode larvae were also found in the intestines of H. copelandi (23.6%), D. urostriatum (3.3%) and P. axelrodi (10%), but in a few number varying from 1 to 6 helminths per host. Similar prevalence and intensity of Digenea adults were observed in the intestines of H. copelandi and Otocinclus sp., whereas the lowest prevalence was found in P. axelrodi. These parasites were not found in D. urostriatum and Apistogramma sp. (Table 8). Metacercariae of Digenea was also observed in the gills of 8.0% of H. copelandi and 3.0% of Apistogramma sp. Twenty cysts of Henneguya sp. were found in the gills of a single specimen of D. urostriatum. Leeches of the genus Placobdella was found at 3.3% prevalence and one parasite per host on the body surface. Relative condition factor of parasitized and non-parasitized fish did not show significant difference (p>0.05). There was also no significant correlation (p>0.05) between parasites intensity and Kn. Hence, these rates of parasites infections load did not compromise the fish health. In summary, the most dominant parasite taxon was Monogenoidea followed by Nematoda. Hyphessobrycon copelandi was the host with the greatest parasite diversity while Apistogramma sp. was host with the smallest parasite diversity. Three days after the arrival of fish at the exporter they are weekly submitted to treatment with formalin and tetracycline. This procedure is done specially with P. axeroldi, the most exported species, which sometimes is kept in tanks up to one year in order to acquire a bigger corporal size and consequently, a better price in external markets. High prevalence of parasitism was found in fish species of exporter’s holding facilities. However, the low mean intensity of parasites was influenced by Tavares-Dias et al. Metazoan and protozoan parasites… 478 Table 5. Parasitological indexes of Trichodina sp. in the gills of five ornamental freshwater fishes from an exporter’s holding facility in the Amazonas State, Brazil. Parameters/Hosts P. axelrodi H. copelandi D. urostriatum Otocinclus sp. Apistogramma sp. Examined fish 89 0 30 32 33 Parasitized fish 3 0 0 6 0 Prevalence (%) 3.4 0 0 18.7 0 Total number of parasites 6 0 0 57 0 Mean intensity 2.0 0 0 9.5 0 Range of MI 1–3 0 0 2-30 0 Table 6. Parasitological indexes of Monogenoidea in the gills of five ornamental freshwater fishes from an exporter’s holding facility in the Amazonas State, Brazil. Parameters/Hosts P. axelrodi H. copelandi D. urostriatum Otocinclus sp. Apistogramma sp. Examined fish 89 34 30 32 33 Parasitized fish 38 8 12 11 1 Prevalence (%) 42.7 23.5 40.0 34.4 3.0 Total number of parasites 100 11 99 127 1 Mean intensity 2.6 1.4 8.2 11.5 1.0 Range of MI 1–6 1-2 1-21 5-17 1 Tavares-Dias et al. Metazoan and protozoan parasites… 479 Table 7. Parasitological indexes of Nematoda in the intestines of five ornamental freshwater fishes from an exporter’s holding facility in the Amazonas State, Brazil. Parameters/Hosts P. axelrodi H. copelandi D. urostriatum Otocinclus sp. Apistogramma sp. Examined fish 89 34 30 32 33 Parasitized fish 21 6 1 5 13 Prevalence (%) 23.6 17.6 3.3 15.6 39.4 Total number of parasites 50 7 1 10 31 Mean intensity 2.4 1.2 1.0 2.0 2.4 Range of parasites 1–14 1-2 1 1-6 1-3 Table 8. Parasitological indexes of Digenea in the intestines of five ornamental freshwater fishes from an exporter’s holding facility in the Amazonas State, Brazil. Parameters/Hosts P. axelrodi H. copelandi D. urostriatum Otocinclus sp. Apistogramma sp. Examined fish 89 34 30 32 33 Parasitized fish 1 4 0 5 0 Prevalence (%) 1.1 11.8 0 15.6 0 Total number of parasites 1 8 0 7 0 Mean intensity 1.0 2.0 0 1.4 0 Range of MI 1 1-4 0 1-3 0 Tavares-Dias et al. Metazoan and protozoan parasites… 480 Parasites of freshwater ornamental fishes from Southern Brazil A survey of parasitic fauna on freshwater ornamental fishes from commercial supplier at the Florianópolis city, Santa Catarina State, Southern Brazil was performed by Piazza et al. (2006). A total of 18 fish species were examined for a period o one year. From a total of 189 fish examined, 75 (40.5%) were parasitized (Table 9). The highest prevalence rate (100%) was found in Gymnocorymbus ternetzi, Paracheirodon innesi, Colisa lalia, Noemacheitus barbatulus, Pteprophyllum scalare, Helostoma temmincki and Mikrogeophagus ramirezi. Intermediate values of prevalence were registered in Xiphophorus helleri (71%), Poecilia sphenops (40%), Beta splendens (50%), Carassius auratus (67%) and Cyprinus carpio (50%). Trichogaster trichopterus, Poecilia reticulata, Macropodus opercularis and Pseudotropheus socolofi were not parasitized. Parasites showed the following prevalences: Monogenoidea (15.7%), metacercariae of heterophyid digenean Ascocotyle sp. Looss, 1899 (15.3%), dinoflagellate Piscinoodinium pillulare (Schäperclaus, 1954) Lom, 1981 (7.0%), ciliate protozoans Trichodina acuta Lom, 1961 (4.9%) and Ichthyophthirius multifiliis Fouquet, 1876 (3.8%), cestodes (2.7%), camallanid nematode Camallanus maculatus Martins, Garcia, Piazza and Ghiraldelli, 2007 (2.7%); copepod crustacean Lernaea cyprinacea Linnaeus, 1758 (2.2%) and Chilodonella sp. Strand, 1928 (0.5%). The majority of fish examined was parasitized by one parasite species, followed by two and three parasites. From four parasites per host species the occurrence was lower (Figure 5). The most dominant taxon of parasite was Digenea in metacercarial stage named Ascocotyle sp. followed by Monogenoidea (Table 10) Digenean are endoparasites with complex life cycle generally found encysted in the muscle, nervous system, gonads, other internal organs or free in eyes (Pavanelli et al., 2002; Santos et al., 2002). Its main pathogenic action is when the fish act as intermediate host in which encysts causing tissue damage (Takemoto et al., 2004). Thus the metacercarial form is more aggressive than the adult worms. Metacercariae of Neascus sp. and Clinostomum sp., cause respectively black spot and yellow grub diseases and are important parasites to the ornamental fish industry by its location on the body surface or fins. According to Carvalho et al. (2008) 90% of Geophagus brasiliensis examined from the Peixe River, Juiz de Fora, MG, were parasitized with Neascus sp. At a mean intensity varying from 1 to 75 parasites. Kuo et al. (1994) registered prevalences of 0.9% Clinostomum sp. and 4% Centrocestus sp. in a survey realized in imported fish from China. Metacercariae of Ascocotyle tenuicollis, A. nunezae and A. nana were described from the heart, gills and viscera of Poecilia petenensis, Cichlasoma meeki and C. octofasciatum (Scholz et al., 1997). On the other hand, Centrocestus sp. was found encysted in the gill filaments of Carassius auratus, Poecilia reticulata, Beta splendens, Xiphophorus variatus and Poecilia latipinna (Tampieri et al., 1999) at 100% prevalence. It is important to emphasize that birds act as definitive hosts and snails as the first intermediate host (Scholz et al., 1997). In ornamental farms from Sri Lanka, Thilakaratne et al. (2003) observed low (0.8%) prevalence of Centrocestus sp. in C. auratus. In Brazil, Piazza et al. (2006), have reported infection rates of Ascocotyle sp. reaching 7,844 specimens in 29 infected fish with mean intensity varying from 1 to 1,070 parasites per host (Tables 10-11). Tavares-Dias et al. Metazoan and protozoan parasites… 483 ponds water consists in efficient method for parasite control. Nevertheless, pH handling might be an efficient strategy for parasite control. Garcia et al. (2009) observed negative correlation between Ich and elevated pH of water in ornamental fish farm. The nematode Camallanus cotti Fujita, 1927 was firstly related in freshwater fish from Japan (Fujita, 1927). Common parasite found in the intestines feeds of blood, tissue liquids or cells host. Heavy infection with a great number of nematode causes inflammatory reaction, anemia, sexual behavior changes and mortality, especially in shorter fish (Wu et al., 2007). This nematode is worldwide distributed allied to introduction of poecilid fish as ornamental fish or to control fly (Kim et al., 2002). In Brazil, Camallanus acaudatus and Camallanus tridentatus were described in Osteoglossum bicirrhosum and Arapaima gigas by Ferraz & Thatcher (1990). On the other hand, Martins et al. (2007) described C. maculatus in X. maculatus from a fish farm in the São Paulo State with a prevalence of 82.0%. In Florianópolis, Southern Brazil, Piazza et al. (2006), the nematode showed low prevalence (2.7%) in X. maculatus and P. sphenops. In experimental infection with camallanid larvae (C. maculatus) in copepod crustacean (Notodiaptomus sp.), Martins et al. (2007) found that 24 h after infection the larvae were located successfully in the hemocele of crustacean. This study showed the importance and feasibility of the uses of crustacean as a disease vector. Xiphophorus maculatus was the unique fish parasitized by all parasites taxa (Tables 10-11) reaching 41% from the total examined fish. It is suggested that high number of X. maculatus analyzed provoked the difference in relation to other fish species. Xiphophorus species are, in fact, the most common and commercialized fish among the aquarists. Seven fish species were parasitized by one parasite taxon, followed by two and three parasite taxa. Multiple occurrences of parasite taxa (five or six parasites) were registered only in one host species. Prevalence rate of I. multifiliis, T. acuta, Monogenoidea and nematodes here observed was lower than those observed by Conroy et al. (1981). On the other hand, Trichodina sp., P. pillulare, I. multifiliis, Monogenoidea and digenean showed higher prevalence in comparison to findings of Kuo et al. (1994). The protozoans I. multifiliis and P. pillulare can proliferate if the water conditions are adequate. In this study, mean intensity of parasites it depended on the fish health status. Although I. multifilis is the most common parasite in ornamental fish culture but no case of severe infection was observed. Low prevalence (3.7%) of I. multifiliis was noted, being X. maculatus, X, helleri, P. sphenops affected fish. Contrarily to mean intensity of 98 parasites observed in P. sphenops, greater mean intensity (442.100 parasites) was reported in Leporinus macrocephalus (Tavares-Dias et al., 2001). Important factors can favor its reproduction as low water temperature, high stocking density and nutritional deficiency. Lernaea cyprinacea is actually dispersed worldwide and in severe cases if infestation causes fish mortality and refuse of consumers (Martins et al., 2002). Gabrielli & Orsi (2000) registered the presence of L. cyprinacea in fish farms and Tibagi river, Paraná State. According their results, not only cultivated fish but also native fish from river are infested. This copepod has low host-specificity. In the studies of Piazza et al. (2006) lerneosis was related in 2.1% prevalence in X. maculatus and P. sphenops one parasite per host (Table 10). In molly (Poecilia latipinna) from India, Kumaraguru et al. (2006) Tavares-Dias et al. Metazoan and protozoan parasites… 484 related for the first time in that country L. cyprinacea. Contrarily to that found in this study by Piazza et al. (2006), Kumaraguru et al. (2006) reported high infestation with 38 parasites in one female fish of 78 mm length. Fish susceptibility it depends on fish species and environment. In a survey of L. cyprinacea from aquarium fish, Shariff et al. (1986), observed higher susceptibility of Helostoma temmincki, an introduced fish, in which was infested for the first time. Santos & Brasil-Sato (2006) analyzing Franciscodoras marmoratus from the Upper São Francisco river observed copepodids of L. cyprinacea when fish were stocked before necropsy. They affirmed that parasitosis was dependent on the body size. On this view, greater fish was more parasitized than smallest. The importance of introduction and dissemination of lerneosis in varied aquatic systems especially in aquarium must be thought. In summary, the most dominant parasite taxon in the studies of Piazza et al. (2006) was Digenea (larval stage) followed by Monogenoidea. The mean intensity of metacercariae and Monogenoidea was sufficient to cause prejudice to fish health. Xiphophorus maculatus was the unique fish species parasitized by 9 types of parasites. It can be concluded that inadequate prophylactic methods in fish farm favored the reproduction and dissemination of parasites in ornamental fish. In this study, the highest parasite prevalence was found by Monogenoidea in fish from the Amazonian region followed by nematodes. Ichthyophthirius multifillis and Piscinoodinium pillulare showed low prevalence rates in the analyzed fish. Sanitary handling must be considered to avoid diseased or asymptomatic fish introduction. This is, in fact, proved when analyzing X. maculatus and X. helleri as the most parasitized fish. For freshwater fish, Thoney & Hargis Junior (1991) suggested salt bath at 35 g.L-1 for 10 minutes. It must be considered the fish tolerance to salt that vary depending on fish species and age. Ornamental and cultured fish maintained in ponds or tanks the addition of 60 mg.L-1 sodium chloride for 8 to 12 hours with water circulation is recommended. This practice reduces the stress and avoids the parasite dissemination (Martins, 2004). Kumaraguru et al. (2006) found successfully control Lernaea cyprinacea infestation with 10 g.L-1 in poecilid fish. Other practices must be commented as the constant water quality and fish health monitoring to verify changes responsible for parasite reproduction. Moreover, earth ponds for ornamental culture must be disinfected with lime to avoid reinfection as well as quarantine practice, certified fish by qualified professionals before and after transport. If these practices allied to technician, farmers and researchers integration the productivity and expansion of ornamental fish industry it reachs the best performance. Tavares-Dias et al. Metazoan and protozoan parasites… 485 Table 9. Prevalence and mean relative dominance of parasites in freshwater ornamental fishes from Southern Brazil (Piazza et al., 2006). Parasites Parasitized fish /examined fish Prevalence (%) Mean relative dominance Monogenoidea 29/189 15.3 0.052 Ascocotyle sp 29/189 15.3 0.907 Piscinoodinium pillulare 13/189 6.9 0.012 Trichodina acuta 9/189 4.7 0.012 Ichthyophthirius multifiliis 7/189 3.7 0.012 Cestoidea 5/189 2.6 0.002 Camallanus maculatus 5/189 2.6 0.001 Lernaea cyprinacea 4/189 2.1 0.000 Chilodonella sp 1/189 0.5 0.000 Figure 5. Relationship between freshwater ornamental fish species parasitized from Florianópolis, SC, Brazil, and number of parasite species. Tavares-Dias et al. Metazoan and protozoan parasites… 488 Parasites of cultured ornamental fish from the Brazilian Southeast region Nowadays, most of Brazilian producers of ornamental fish have the aquaculture as the principal activity, in contrast of last decades (Fujimoto et al., 2006). Hence, ornamental fish export has emerged as an important activity generating foreign exchange for the three states of Southeast region (Figure 6), Rio of Janeiro (RJ), São Paulo (SP) and Espírito Santo (ES). From 2006 to 2007, these states exported US$ 418.572 in freshwater ornamental fish. In 2007, this production has increased 100%. 0 50,000 100,000 150,000 200,000 250,000 U S $ RJ SP ES States 2006 2007 Figure 6.Production of freshwater ornamental fish in Rio of Janeiro (RJ), São Paulo (SP) and Espírito Santo (ES) States, in 2006 and 2007. Ibama (2008). As the demand for cultured ornamental fish is increasing, consequently the parasitic infections can be one of the most impacting problems for cultured fish in Southeast region. In Brazil, few studies regarding parasitic infections of cultured ornamental fish exist (Piazza et al., 2006; Tavares-Dias et al., 2009). High Prevalence rates of metazoan parasites such as nematodes and Monogenoidea have been reported from cultured ornamental fish in fish farms or pet shop from Rio of Janeiro and São Paulo states (Table 12). However, in fish farms of other Brazilian states the infections rates are still unknown. Tavares-Dias et al. Metazoan and protozoan parasites… 489 Ornamental fish in intensive culture are continuously affected by management practices such as handling, crowding, transport, poor water quality, and frequently provokes stress to fish, rendering them susceptibility to a variety of other parasites and pathogens. Infections by nematodes Camallanus cotti have been responsible for high mortality rate of Poecilia reticulata, in Rio of Janeiro fish farm (Alves et al., 2000). This mortality was due to the pathology caused by C. cotti, which includes microscopic lesions with hemorrhage, congestion, edema, extensive areas of erosion on the mucosa and rectum, with an enlargement of the intestinal walls, without the presence of inflammatory cells (Menezes et al., 2006). Moreover, metacercariae of Clinostomum marginatum (yellow-spot disease) have been found causing lesions on the fin of P. scalare (Alves et al., 2001). Table 12. Ornamental fish parasites of intensive culture in Southeast region from Brazil. Host fish Parasites P (%) MI Reference Xiphophorus sp. Urocleidoides sp. 100 6.6 Garcia et al.(2003) Xiphophorus sp. I. mutifiliis 22.2 1.5 Garcia et al.(2009) Xiphophorus sp. Trrichodina sp. 54.2 1.4 Garcia et al.(2009) P. scalare Monogenea 100 50 Fujimoto et al. (2006) S. discus Dactylogyrus sp. - - Dambros (2007) P. reticulata C. cotti 93,4 4.0 Alves et al.(2000) P. scalare Capillaria sp. 100 ~14 Fujimoto et al.(2006) X. maculatus C. maculatus 82 2.8 Martins et al.(2005) P. reticulata C. cotti - - Menezes et al.(2006) B. splendens C. cotti - - Menezes et al.(2006) P. scalare C. marginatum - 1-93 Alves et al.(2001) P= prevalence; MI= mean intensity. Concluding Remarks Parasitic infections represent an important challenge for ornamental fish, and that is undesirable in culture, same when in low intensity. High stocking density can also facilitate the rapid propagation of parasites, leading to the occurrence of severe diseases in the culture. Therefore, quarantine and prophylaxis are extremely important in the ornamental aquaculture, as well as in the exportation stage and hence must not be neglected (Tavares-Dias et al., 2009). 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