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Pesquisa Agropecuária Brasileira

Print version ISSN 0100-204X

Pesq. agropec. bras. vol.48 no.8 Brasília Aug. 2013

http://dx.doi.org/10.1590/S0100-204X2013000800034 

AQUACULTURE

 

Parasitic fauna in hybrid tambacu from fish farms

 

Parasitofauna no híbrido tambacu de pisciculturas

 

 

Ronilson Macedo SilvaI; Marcos Tavares-DiasII; Maycon Willian Reis DiasII; Márcia Kelly Reis DiasIII; Renata das Graças Barbosa MarinhoIII

IUniversidade do Estado do Amapá, Avenida Presidente Vargas, nº 650, CEP 68906-970 Macapá, AP, Brazil. E-mail: rony@hotmail.com.br
IIEmbrapa Amapá, Rodovia Juscelino Kubitschek, Km 5, nº 2.600, CEP 68903-419 Macapá, AP, Brazil. E-mail: marcos.tavares@embrapa.br, mayconw.dias@hotmail.com
IIIUniversidade Federal do Amapá, Rodovia Juscelino Kubitschek, Km 2, CEP 68902-280 Macapá, AP, Brazil. E-mail: marciakr.dias@hotmail.com, renatagbmarinho@yahoo.com.br

 

 


ABSTRACT

The objective of this work was to evaluate the parasitic fauna of hybrid tambacu (Colossoma macropomum x Piaractus mesopotamicus) from fish farms and the host-parasite relationship. A hundred and fourteen fish were collected from four fish farms in Macapá, in the state of Amapá, Brazil, 80.7% of which were infected by: Ichthyophthirius multifiliis (Ciliophora); Piscinoodinium pillulare (Dinoflagellida); Anacanthorus spatulatus, Notozothecium janauachensis, and Mymarothecium viatorum (Monogenoidea); Neoechinorhynchus buttnerae (Acanthocephala); Cucullanus colossomi (Nematoda); Perulernaea gamitanae (Lernaeidae); and Proteocephalidae larvae (Cestoda). A total of 8,136,252 parasites were collected from the examined fish. This is the first record of N. buttnerae, C. colossomi, N. janauachensis, M. viatorum, and Proteocephalidae for hybrid tambacu in Brazil. Ichthyophthirius multifiliis was the most prevalent parasite, whereas endohelminths were the less. A positive correlation was observed between number of I. multifiliis and total length and weight of fish, as well as between number of P. gamitanae and total length. The infection by I. multifiliis had association with the parasitism by Monogenoidea. Low water quality contributes to high parasitism of hybrid tambacu by ectoparasites, which, however, does not influence the relative condition factor of fish.

Index terms: Colossoma macropomum, Ichthyophthirius multifiliis, Piaractus mesopotamicus, ectoparasite, native fish, host-parasite relationship.


RESUMO

O objetivo deste trabalho foi avaliar a parasitofauna de tambacu (Colossoma macropomum x Piaractus mesopotamicus) de pisciculturas e a relação parasito-hospedeiro. Cento e catorze peixes foram coletados de quatro pisciculturas de Macapá, AP, 80,7% dos quais estavam infectados por: Ichthyophthirius multifiliis (Ciliophora); Piscinoodinium pillulare (Dinoflagellida); Anacanthorus spatulatus, Notozothecium janauachensis e Mymarothecium viatorum (Monogenoidea); Neoechinorhynchus buttnerae (Acanthocephala), Cucullanus colossomi (Nematoda); Perulernaea gamitanae (Lernaeidae); e larvas de Proteocephalidae (Cestoda). Um total de 8.136.252 parasitos foram coletados dos peixes examinados. Esse é o primeiro registro de N. buttnerae, C. colossomi, N. janauachensis, M. viatorum e Proteocephalidae para híbridos tambacu no Brasil. Ichtyophthirius multifiliis foi o parasito mais prevalente, enquanto os endohelmintos, os menos. Observou-se correlação positiva entre número de I. multifiliis e comprimento total e peso corporal dos peixes, bem como entre número de P. gamitanae e comprimento total. A infeção por I. multifiliis mostrou associação com o parasitismo por Monogenoidea. A baixa qualidade da água contribui para o alto parasitismo do hibrido tambacu por ectoparasitas, que, no entanto, não influi no fator de condição relativo dos peixes.

Termos para indexação: Colossoma macropomum, Ichthyophthirius multifiliis, Piaractus mesopotamicus, ectoparasita, peixe nativo, relação parasito-hospedeiro.


 

 

Introduction

Brazil has a large variety of native fish species with potential for cultivation, but most of them are not suited to captivity, since their eating habits, density, and appropriate management are unknown. Hybridization has been widely used in aquaculture, because interspecific fish hybrids have desirable quantitative and qualitative traits, including improved growth, harvestability, and environmental tolerance (Pinheiro et al., 1991; Lorenzen et al., 2012).

In Brazil, the tambacu hybrid, resulting from the crossbreeding of female Colossoma macropomum Cuvier, 1818 (tambaqui) and male Piaractus mesopotamicus Holmberg, 1887 (pacu), was created to assemble in one single species the qualities of these two. The tambacu is more resistant to disease than C. macropomum or P. mesopotamicus (Tavares-Dias et al., 2001a, 2001b, 2007; Martins et al., 2002), and grows faster than P. mesopotamicus (Tavares-Dias et al., 2007). General characteristics such as shape, size, diet, and grayish color are closer to the parental tambaqui. In 2010, the production of this hybrid was of 21,621.4 tons, with cultivation in several states of the North, Northeast, Southeast, and Central-West regions of Brazil (Boletim estatístico da pesca e aquicultura , 2012). Although the state of Amapá, in the North, contributed little to this production, it has great potential.

In intensive culture systems, high stocking densities have been used to increase biomass productivity. However, this can lead to the incidence of a variety of parasitoses if culture conditions are inadequate (Tavares-Dias et al., 2001a; Lizama et al., 2007; Eiras et al., 2010; Martins et al., 2010; Godoi et al., 2012), which may result in epizooties, depending on the abundance of parasites and on the disease severity. These diseases, however, are most prevalent in newly cultured species, or in newly developed culture systems, and become rare once husbandry practices are well developed.

The parasitic fauna of the hybrid tambacu has been studied mainly in the southeastern region of Brazil. Studies report the occurrence of the protozoa Piscinoodinium pillulare (Martins et al., 2000, 2002; Tavares-Dias et al., 2001a; Schalch & Moraes, 2005), Ichthyophthirius multifiliis (Ceccarelli et al., 1990; Martins & Romero, 1996; Tavares-Dias et al., 2001a; Martins et al., 2000, 2002), and Trichodina sp. (Ceccarelli et al., 1990; Tavares-Dias et al., 2001a; Martins et al., 2002); of Monogenoidea (Ceccarelli et al., 1990; Martins & Romero, 1996; Tavares-Dias et al., 2001b; Martins et al., 2000, 2002); of the crustaceans Lernaea cyprinacea (Martins & Romero, 1996; Martins et al., 2000, 2002; Tavares-Dias et al., 2001b; Schalch & Moraes, 2005), Dolops carvalhoi (Tavares-Dias et al., 2007), Myxobolus myxosporean colossomatis (Martins et al., 1999), and Henneguya piaractus (Martins & Romero, 1996; Martins et al., 1999); and of the digenean Posthodiplostomum sp. (Alexandrino et al., 1996). However, in the North of Brazil, including the state of Amapá, there is no knowledge of epidemiological studies on hybrid tambacu from fish farms.

Researches related to the host-parasite relationship are very useful tools to prevent diseases (Godoi et al., 2012). Parasites have been a great concern in fish production, since they often result in reduced growth, increased susceptibility to other diseases, and fish loss. An effective disease control depends on integrated sanitary management, which considers fish species, environment, parasites, and husbandry practices. Despite the importance of field parasitological studies, with the identification of parasites and accurate diagnosis of the causes of the diseases, there is a severe scarcity of data on epidemiological and sanitary diagnostics, especially in fish farms.

The objective of this work was to evaluate the parasitic fauna of hybrid tambacu (Colossoma macropomum x Piaractus mesopotamicus) from fish farms and the host-parasite relationship.

 

Materials and Methods

From October 2009 to September 2010, 114 hybrid tambacu were collected in four fish farms of the municipality of Macapá, in the state of Amapá, Brazil. Each farm had different pond sizes, feeding systems (two to four times a day), and stocking densities (Table 1), and used several brands of artificial feed. However, all of them used crude protein levels of 32%, during the fatten stage.

 

 

The fish were collected with a net, weighed (g), and measured in length (cm). Then, they were necropsied for parasitological analysis. Each specimen was examined in the mouth, opercula, gills, and gastrointestinal tract. The gills were removed and analyzed with a common light microscope. The gastrointestinal tract was removed, placed in a Petri dish containing NaCl (0.8%), and examined under a stereomicroscope. The methods used for collection, fixation (Eiras et al., 2006; Thatcher, 2006), and quantification of the parasites (Tavares-Dias et al., 2001a, 2001b) were performed according to previous recommendations. The identification of the collected parasites was done according to Díaz-Ungria (1968), Kritsky et al. (1979), Thatcher & Paredes (1985), Boeger et al. (2002), Belmont-Jégu et al. (2004), and Thatcher (2006). After these procedures, the parasitological indexes were determined, including prevalence, mean intensity, abundance (Bush et al., 1997), and mean relative dominance (Rohde et al., 1995).

The relative condition factor (Kn) was investigated for parasitized and non-parasitized fish. The differences between them were compared by the t-Student test, at 5% probability. Data of total length and weight was used to determine the Kn of hosts (Le-Cren, 1951). The correlation coefficient of Spearman's rank (rs) was used to determine the possible correlation between total length and weight of the host with the number of parasites (Zar, 1999).

In each survey, pH, temperature, and levels of dissolved oxygen of the ponds were measured using digital equipment, suitable for each purpose.

 

Results and Discussion

Temperature and pH were similar in all investigated fish farms (Figure 1). However, dissolved oxygen levels were low in three fish farms, with mean values not suitable for the good production performance and health maintenance of farmed fish (Martins et al., 2010; Godoi et al., 2012).

 

 

Tambacu from the four fish farms had similar parasitism levels (Table 2). The following parasites were found: Ichthyophthirius multifiliis Fouquet, 1876 (Protozoa: Ciliophora); Piscinoodinium pillulare (Schäperclaus, 1954) Lom, 1981 (Protozoa: Dinoflagellida); Anacanthorus spatulatus Kritsky, Thatcher & Kayton, 1979; Notozothecium janauachensis Belmont-Jegu, Domingues & Laterça, 2004; Mymarothecium viatorum Boeger, Piasecki & Sobeck, 2002 (Monogenoidea: Dactylogyridae); Neoechinorhynchus buttnerae Golvan, 1956 (Acanthocephala: Neoechinorhynchidae); Cucullanus Colossoma Ungría-Díaz, 1968 (Nematoda: Cucullanidae); Perulernaea gamitanae Thatcher & Paredes, 1985 (Copepoda: Lernaeidae); and Proteocephalidae Mola, 1929 (Cestoda: Eucestoda). However, no clinical signs of disease or mortality were observed in any fish during the survey.

 

 

There was a lower prevalence of I. multifiliis in the gills of tambacu from farm 1, although the intensity and abundance were higher (Table 3). A high prevalence of I. multifiliis was verified in the other three fish farms, which had lower oxygen levels. These parasites are transmitted directly from fish to fish; therefore, the proximity between hosts might be very important for successful transmission. Moreover, in these three fish farms, sometimes the fish were not fed properly, due to lack of artificial ration, and the sanitary conditions were poor. Suboptimal feeding and poor water quality are stressors that result in impaired growth, which increases the susceptibility to opportunistic parasites and pathogens. However, in fish farms where fish had better nutritional and sanitary conditions, as well as adequate oxygen levels, there was a lower prevalence of this ciliate parasite (Martins et al., 2010; Omeji et al., 2010).

Despite the high prevalence, no clinical signs of ichthyophthiriasis were found, showing a chronic parasitism, since in the Amazon region there are no sudden changes in temperatures that may favor the occurrence of acute and severe infections. In contrast, in fish farms from southeastern Brazil, ichthyophthiriasis, has been the major cause of mortality in tambacu (Martins et al., 2000, 2002), especially during the winter period. Therefore, distinct patterns of infection by I. multifiliis can occur due to variation in environmental temperatures, depending on the region where the fish are grown.

Parasitism by P. pillulare occurred only in the gills of tambacu from two fish farms (Table 3). However, the observed rates of infection were lower than those described for tambacu farmed in different regions other than the Brazilian Southeast (Tavares-Dias et al., 2001a; Schalch & Moraes, 2005), and were also lower than reports of P. mesopotamicus in the Central-West region (Sant'Ana et al., 2012), where this protozoan caused high mortality. Martins et al. (2001) reported a mortality of 61.3% in the winter season (May-August) in the Southeast region, when water temperatures ranged from 17 to 24ºC. In the Central-West region, this protozoan occurred in winter and summer, and 100% of mortality was observed by Sant'Ana et al. (2012). However, no mortality has been recorded in fish farmed in the Amazon region.

Anacanthorus spatulatus monogenoideans were found in the gills of tambacu from all four fish farms. However, N. janauachensis were observed parasitizing tambacu only in fish farm 4, whereas M. viatorum occurred in fish farms 1 and 2. The prevalence of the infection by gill monogenoideans in fish farm 1 was lower, compared to the others fish farms, and the intensity and abundance of these parasites were lower in fish farm 3 (Table 4). The differences in infection levels between fish farms are probably due to the peculiarities of each farm, and to fish age, water quality, and management practices.

 

 

In intensive fish farming, where environmental conditions are often unfavorable for fish, monogenoideans can cause mortality (Buchmann & Bresciani, 2006; Eiras et al., 2010), depending on the abundance and pathogenicity of the species (Buchmann & Bresciani, 2006). This parasite provokes an excessive production of mucus on the gill filaments, decreasing the respiratory capacity of fish. The prevalence of monogenoideans in the present study was higher than the one found for tambacu cultured in the southeastern region of Brazil (Tavares-Dias et al., 2001b; Martins et al., 2002; Schalch & Moraes, 2005), but the intensity was lower (Tavares-Dias et al., 2001b). Therefore, since these parasites are directly transmitted from fish to fish, the proximity among hosts in ponds might also be important for the successful transmission of this parasite.

In addition, for monogenoideans, although there is a wide variation in optimum temperature, the reproduction in some species is highly influenced by temperature (Buchmann & Bresciani, 2006). Schalch & Moraes (2005) reported a higher prevalence of monogenoideans in tambacu in periods of higher temperatures (spring and summer), in the Southeast region of Brazil. The mean temperature of water in the present study was of 30ºC, and this high temperature, along with the low water quality, favored the reproduction of A. spatulatus, M. viatorum, and N. janauachensis in the gills of tambacu. Future studies on the seasonal pattern of these monogenoideans are necessary for the knowledge of their life-cycle, which is still unknown.

Parasitism by the copepod P. gamitanae occurred only in fish farm 1, with 751 specimens collected - 542 in the mouth and 209 in the gills. In the mouth, the prevalence was of 100% (n=30), with a mean intensity of 18.1 parasites per host (range of 1-53). In the gill, the prevalence was of 63.3% (n=19), with a mean intensity of 11.0 parasites per host (range of 3-35). In contrast, low parasitism by P. gamitanae was found for farmed C. macropomum in the state of Rondônia in northern Brazil (Godoi et al., 2012).

The prevalence of this species in the mouth, gills, and nasal cavity of C. macropomum has been reported to be of 95%, in fish farmed in Manaus, in the state of Amazonas (Benetton & Malta, 1999). Heavy infestation of this parasite in young fish causes mortality and economic losses (Godoi et al., 2012). However, P. gamitanae has not been recorded in other Brazilian regions. It seems that this parasite is currently restricted to the northern region, possibly due to a geographical barrier. Therefore, appropriate sanitary care is needed when transporting fish, in order to prevent these emerging parasites to be introduced in other fish farms.

The intensity of P. gamitanae increased with the growth of tambacu (Figure 2), since larger fish do not fed on plankton, as the younger ones do, which also feed on copepods in the ponds. In Catla catla, parasitized by six species of Lernaea, an increased number of parasites was associated to the body growth of fish (Tasawar et al., 2007). In the gills of Oreochromis niloticus, increased prevalence and abundance of the ectoparasite Lamproglena was found to be correlated with growth (Alves et al., 2000; Lizama et al., 2007). However, according to Alves & Luque (2006), this relationship is more associated with the degree of specialization of the attachment organs of ectoparasites and the availability of infective forms of certain age groups of the hosts than with the availability of physical space.

 

 

In fish farm 2, 77 specimens of N. buttnerae were collected from the intestine of five tambacu, with a prevalence of 12.5% and mean intensity of 18.5 parasites per host (range of 1-56). There are no records of these helminths parasitizing tambacu in other locations in Brazil. However, a prevalence of 100% and a mean intensity of 81.3 specimens per host were responsible for the mortality of C. macropomum farmed in Manaus, in the state of Amazonas (Malta et al., 2001). Acanthocephalan infection causing epizooty in farmed fish has been rarely reported (Eiras et al., 2006, 2010), since the occurrence of Neoechinorhynchus species is more common in natural populations. Neoechinorhynchus species have a life cycle that involves ostracods as intermediate hosts and fish as definitive hosts (Martínez-Aquino et al., 2009). The pathogenesis depends on the species of acanthocephalan, infection intensity, size of the parasites and hosts, and proboscis penetration level (Eiras et al., 2006). Treatment for this gastrointestinal parasite is difficult and, in high abundance, the fish do not fed. Malta et al. (2001) recommend the sacrifice of the severely infected fish, in order to eliminate adult parasites. Furthermore, these authors suggest disinfection with calcium oxide and the drying of tanks, promoting the elimination of the eggs and larvae of these parasites, which develop in intermediate hosts.

One adult specimen of the nematode C. colossomi was collected in the intestine of one specimen of tambacu (prevalence of 4.3%) in fish farm 4. Nematoda are the most common endohelminths in natural populations, in different environments. These parasites can decrease the growth and sexual maturation of farmed fish, but this disease rarely causes epizooty (Eiras et al., 2010). Cucullanidae nematodes are viviparous, and a micro-crustacean - usually a copepod - is needed as an intermediate host (Thatcher, 2006). Since only one tambacu was parasitized by C. colossomi, it was probably infected by the accidental ingestion of the shrimp Macrobrachium amazonicum, which is an intermediate host of this nematode, present in the studied fish farms. Ahmed et al. (2007) reported 100% of infection by Procamallanus heteropneustes on farmed Heteropneustes fossilis, with mean intensity of 14.4 parasites per host. These authors concluded that the ingestion of copepods was the cause of this endoparasitism, since these crustaceans were frequently infected with larvae of P. heteroneustus.

One hybrid tambacu had three specimens of adult Cestoda, from the Proteocephalidae family. Martins et al. (2000) also observed low levels of infection by proteocephalid cestodes in farmed Cyprinus carpio, in southeastern Brazil. In teleost fish, approximately 90% of the cestode parasites are from the Proteocephalus species (Rego, 2004). However, infections by cestodes species are uncommon in farmed fish, due to their complex life cycle, which requires more than one intermediate host.

Among the 114 examined tambacu, the monogenoideans A. spatulatus, M. viatorum, and N. janauachensis accounted for 77.2% of the infections, followed by I. multifiliis (67.5%). The greatest abundance was found for the protozoan I. multifiliis, and the lowest, for the nematode C. colossomi (Table 5). However, the condition factor of parasitized tambacu (Kn = 1.000±0.030) did not differ from that of non-parasitized ones (1.000±0.028) and showed no significant difference (p = 0.028).

There was a frequent association of I. multifiliis and Monogenoidea in tambacu gill (Figure 3). This parasitic association was relatively smaller in fish from fish farm 1, which showed the lowest prevalence for both parasites. A high positive correlation (p<0.001) was observed between the intensity of I. multifiliis in the gills and the weight and length of tambacu (Figure 4). Gills are sites of filter feeding; therefore, bigger fish cover wider areas in search of food and, as result, take in more food than smaller ones, with higher exposure to parasites (Omeji et al., 2010). Similar findings were confirmed for Heterobranchus longifilis from natural and cultured environments (Omeji et al., 2010).

 

 

 

 

Conclusions

1. The parasitic fauna of hybrid tambacu from Macapá, in the state of Amapá, Brazil, is not diverse, with two protozoans, three monogenoideans, one lernaeid, and three endohelminth species in the evaluated fish farms.

2. Low water quality contributes to high parasitism by ectoparasites in fish farms, but this high parasitism has no influence on the relative condition factor (Kn) of hybrid tambacu.

3. This is the first record of Neoechinorhynchus buttnerae, Cucullanus colossomi, Anacanthorus spatulatus, Mymarothecium viatorum, Notozothecium janauachensis, and Proteocephalidae for hybrid tambacu in Brazil.

 

Acknowledgements

To Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), for the financial support and for the grant to Marcos Tavares-Dias.

 

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Received on May 25, 2011 and accepted on February 26, 2013

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