Populations of Lamproglena pulchella von Nordmann 1832 (Copepoda: Eudactylinidae) in cyprinid fish in rivers with different pollution levels

Abstract

A total of 512 chub (Leuciscus cephalus L.) individuals sampled from four rivers with different pollution levels were examined for Lamproglena pulchella (von Nordmann 1832) prevalence and mean intensity. As a result of the L. pulchella mode of reproduction, the parasite populations showed a significant degree of aggregation. The results, excluding the effect of fish health conditions on the parasite infection, provide evidence of the influence of water quality on parasite prevalence. Parasite density increase in relation to fish length and age suggests a dependence of infection intensity to the exposure time on the fish.

Relação parasito-hospedeiro em peixes de pisciculturas da região de Assis, Estado de São Paulo, Brasil. 1. <em>Oreochromis niloticus</em> (Linnaeus, 1757)

“…apresentaram correlação positiva significativa com o comprimento padrão nas pisciculturas de Tarumã e Cândido Mota, respectivamente (Tabela 3). Galli et al (2001b) observaram, para Leuciscus cephalus, aumento na abundância de Lamproglena pulchella proporcionalmente com o comprimento do peixe, ou seja, peixes não infestados apresentaram comprimentos significativamente menores quando comparados aos peixes parasitados por um ou mais copépodes. O mesmo ocorreu com Lamproglena sp.…”

Seasonal occurrence and site selection of Lamproglena pulchella Von Nordmann, 1832 (Copepoda, Lernaeidae) on the gills of rudd, Scardinius erythrophthalmus (Pisces, Cyprınidae)

“…Saglam (1998) reported a 12.5% prevalence and a mean intensity of 2.1 of L. pulchella in Chondrostoma regium, and a 28.5% prevalence and 2.0 mean intensity in Capoeta trutta, respectively, from the Keban Dam Lake. Galli et al (2001) found L. pulchella on the gills of Scardinius erythrophthalmus, Alburnus alburnus alborella (De Filippi, 1844), L. cephalus, Leuciscus souffia Risso, 1827, Esox lucius Linnaeus, 1758, and Chondrostoma soetta Bonaparte, 1840 from northern Italy. Prevalence was 34% and mean intensity was 1.8 in the unpolluted Ticino River, and a prevalence of 51% and a mean intensity of 2.1 were found in the moderately polluted Nagivlio Grande River, but no L. pulchella were found in the fish population in the most polluted rivers.…”

“…Lamproglena pulchella is a bioindicator species of the pollution level of the aquatic ecosystem (Stavrescu-Bedivan et al, 2008). Galli et al (2001) have studied L. pulchella on Leuciscus cephalus (Linnaeus, 1758) from four rivers with different pollution levels and found that environmental pollution affects parasite abundance. Khan & Thulin (1991) remarked that decreased parasitism might ensue through toxicity of the pollutant to the free-living stage and intermediate hosts, or through alteration of the host's physiology.…”

“…Environmental pollution affects the existence of L. pulchella (cf. Galli et al, 2001). Lake Sapanca is currently under the influence of domestic, agricultural, and industrial pollution.…”

“…occur in Asia (Kumari et al, 1989), Russia (Akhmerov & Bogdanova, 1957), Africa (Tsotetsi et al, 2004), and in Brazil (Martins et al, 2010). Lamproglena pulchella Von Nordmann, 1832 has been reported from Hungary (Ponyi & Molnar, 1969), Italy (Galli et al, 2001), Latvia (Kirjusina, 2007), Austria (Jirsa et al, 2006), and from Serbia (Cakic et al, 1998). L. pulchella was reported in Turkey by Soylu (1990) from Scardinius erythrophthalmus (Linnaeus, 1758), by Saglam (1998) from Chondrostoma regium (Heckel, 1843) and Capoeta trutta (Heckel, 1843), and by Öktener et al (2008) from Cyprinus carpio Linnaeus, 1758 and C. trutta.…”