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OCCURRENCE and INTENSITY of PARASITES in EUROPEAN CATFISH, Silurus Glanis L., 1758 from the ANZALI WETLAND, SOUTHWEST of the CASPIAN SEA, IRAN

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OCCURRENCE and INTENSITY of PARASITES in EUROPEAN CATFISH, Silurus Glanis L., 1758 from the ANZALI WETLAND, SOUTHWEST of the CASPIAN SEA, IRAN Croatian Journal of Fisheries, 2014, 72, 25 – 31 J. D. Roohi et al.: Cat#sh parasites in the Anzali wetland http://dx.doi.org/10.14798/72.1.710 CODEN RIBAEG ISSN 1330-061X OCCURRENCE AND INTENSITY OF PARASITES IN EUROPEAN CATFISH, Silurus glanis L., 1758 FROM THE ANZALI WETLAND, SOUTHWEST OF THE CASPIAN SEA, IRAN Javad Daghigh Roohi 1* , Masoud Sattari 2, Mehrdad Asgharnia 1, Rudabeh Rufchaei 3 1 Parasitology group, Fish disease department, National Inland Water Aquaculture Research Institute, Anzali, Iran 2 Fisheries Department, Faculty of Natural Resources, University of Guilan, Sowmeh Sara, Iran 3 Nutrition and feeding of fish station, National Inland Water Aquaculture Research Institute, Anzali, Iran * Corresponding Author, E-mail: [email protected] ARTICLE INFO ABSTRACT Received: 26 November 2013 The Anzali wetland is located in the southwest of the Caspian Sea. A total Received in revised form: 20 January 2014 of 86 European catfish, Silurus glanis L., 1758 , were collected between Accepted: 20 January 2014 April and July 2012 in this wetland. After recording biometric characteris- Available online: 28 January 2014 tics, common necropsy and parasitology methods were used. In the pres- ent study, a total of 17,214 individuals of 14 parasite species were recov- ered from European catfish. Parasitofauna consisted of two protozoans: Ichthyophthirius multifiliis and Trichodina sp.; two nematodes: Raphidasca- ris acus and Eustrongylides excisus larvae; one acanthocephalan: Acantho- Keywords: cephalus lucii ; three cestodes: Silurotaenia siluri , Proteocephalus osculatus Fish and Bothriocephalus sp. larvae; two digenean trematodes: Orientocread- Parasite ium siluri and Diplostomum spathaceum ; two monogenean trematodes: Silurus glanis Silurodiscoides vistulensis and Silurodiscoides siluri ; and two crustaceans: Caspian Sea copepodid stage of Lernaea cyprinacea and Argulus foliaceus . The occur- Anzali rence of R. acus, I. multifiliis , Trichodina sp., Silurotaenia siluri , A. lucii , A. Wetland foliaceus in S. glanis has been reported for the first time in Iran. INTRODUCTION age of European catfish. The very wide diet spectrum facili- tates the transmission of the parasites of complex life cycle The Anzali wetland (37 0 25’ N, 49 0 28’ E), with a surface (Sobecka et al., 2010). Parasites of bonyfish species in the area of about 15,000 ha and 49 fish species is located in southern parts of Caspian Sea and its basin have been re- the southwest of the Caspian Sea in Guilan province, Iran. ported by several authors (Eslami and Kohneshahri, 1978; This freshwater lagoon is filled by several rivers and sepa- Sattari, 1996, 1999; Daghigh Roohi, 1997; Pazooki and rated from the sea by a dune system. Based on the Ramsar Aghlmandi, 1998; Sattari et al., 2002; Daghigh Roohi and convention on wetlands, the Anzali Wetland has an inter- Sattari, 2004; Sattari et al., 2005; Khara et al., 2005, 2011), national importance (The Ramsar list of Wetlands of In- but there have been limited studies on European catfish ternational Importance, 2013). One of the most important parasites in the Anzali wetland (Sefidkare-Langerudi, 1965; species in the Anzali wetland is European catfish, Silurus Sattari, 1996). Sefidkare-Langeroudi (1965) reported seven glanis , also known as wels or sheatfish. It is among the larg- parasite species from the intestine of S. glanis in the Anzali est freshwater fish worldwide, with a maximum record of 5 wetland consisting of Proteocephalus osculatus , Pompho- m in total length and body mass of 306 kg (Alp et al., 2011) rhynchus perforator , Aphanurus stossichi , Corynosoma stru- and individuals over 50 kg being regularly angled (Slavík et mosum , Cucullanus sphaerocephalus , Anisakis sp. larvae and al., 2007). European catfish is a nocturnal predator which Bunocotyle cingulata . In other studies, Sattari (1996) recov- forages near bottom and in water column. Larvae and juve- ered Eustrongylides excisus larvae from one specimen of S. niles are benthic, feeding on a wide variety of invertebrates glanis and Jalali Jafari (1998) reported two monogenean and fish. Adults prey on fish and other aquatic vertebrates. species including Silurodiscoides siluri and Silurodiscoides The type of its diet depends on the food availability and the vistulensis from S. glanis. In addition, Khara et al . (2005) re- © "e Author(s) 2014. Published by University of Zagreb, Faculty of Agriculture. All rights reserved. 25 Croatian Journal of Fisheries, 2014, 72, 25 – 31 J. D. Roohi et al.: Cat#sh parasites in the Anzali wetland covered seven parasite species from S. glanis in the Amirke- and expressed as a percentage. The dominance values were layeh wetland (37 0 17’ N, 50 0 12’ E) consisting of copepodid used for classification of parasites as: eudominant (>10%), stage of Lernaea cyprinacea , Aphanurus stossichi , Raphidas- dominant (5.1% - 10%), subdominant (2.1% - 5%), rece- caroides sp., Triaenophorus crassus, Diplostomum spatha- dent (1.1% - 2%) and subrecedent (<1.0%) of given species ceum, S. siluri and S. vistulensis. (Niedbala and Kasparzak, 1993). Mean intensity of infec- On the other hand, Yakhchali et al. (2012) recovered three tion and abundances of parasite species (with prevalences helminth parasites in the gastrointestinal tract of S. glanis >10%) among seasons, age groups and sexes were tested from the Zarrineh-rud river (36 0 49’ N, 46 0 20’ E) consist- by the Kruskal-Wallis test (KW, multiple comparisons) and ing of Orientocreadium siluri , Crowcrocoecum skrjabini and Mann-Whitney U test (MW, pairwise comparisons). Results Botriocephalus gowkongensis, but there is no recently pub- were considered significant at the 95% level (p<0.05). Com- lished report on the parasite communities of European cat- putations were performed using the SPSS programme at the fish and epizootiological aspects of these parasites in the University of Guilan Computer Services. Anzali wetland. RESULTS MATERIALS AND METHODS In the present study, a total of 17,214 individuals of two pro- A total of 86 European catfish, S. glanis, were collected from tozoan and 12 metazoan parasites, including members of the Anzali international wetland (37 0 25’ N, 49 0 28’ E) in the the parasite taxa: Nematoda, Cestoda, Digenea, Monoge- southwest of the Caspian Sea (Guilan province, Iran) on 12 nea, Copepoda and Brachiura were determined (Table 1). separate occasions between April and July 2012. Fish were The occurrence of R. acus, I. multifiliis , Trichodina sp., Silu- trapped with fyke net and transported to the Parasitology rotaenia siluri , A. lucii , A. foliaceus in S. glanis has been re- laboratory of National Inland water Aquaculture Research ported for the first time in Iran. Institute in Anzali city alive in water obtained from the col- In the present study, none of the fish were devoid of para- lection site. A dissolved oxygen saturation of approximately site; two fish (2.33%) were infected with two parasite spe- 85-90% was maintained during transport. Water tempera- cies; eight fish (9.30%) with three species; 10 fish (11.63%) ture was determined at the collection site. Dissolved oxygen with four species; 23 fish (26.74%) with five species; 23 fish was measured using a dissolved oxygen meter (Oxi-323 B/ (26.74%) with six species; 17 fish (19.77%) with seven spe- SET). Upon arrival, fish were weighed and measured and cies and three fish (3.49%) with eight species. Only two fish then examined externally for gross signs of parasitism. If were infected with less than 20 parasites (2.33%); 22 fish no gross signs were observed, skin biopsies were prepared (25.58%) had 20 - 50 parasites; 10 fish (11.63%) had 50 - from the entire length of the lateral body wall. European cat- 100 parasites; 24 fish (27.91%) had 100 - 200 parasites; 15 fish averaged 924.13 g (± 566.77 g, range = 186 - 3815 g) in fish (17.44%) had 200 - 300 parasites and 13 fish (15.12%) weight, and averaged 52.80 cm (± 9.29 cm, range = 33.20 had more than 300 parasites. - 85.50 cm) in total length. A gill biopsy was collected from The eudominant parasites of European catfish (Table 1) were the second arch. A fin biopsy was collected from the caudal monogeneans and Trichodina sp. (D = 66.10% and 14.53%, fin. Wet mounts of all biopsied tissues were prepared for respectively). The dominant parasite was I. multifiliis (D = further analysis. 7.22%) . The subdominant parasites were copepodid stages After recording biometric characteristics, common necropsy of L. cyprinacea and R. acus (D = 3.78% and 3.01%, respec- and parasitological methods according to Stoskopf (1993) tively). The recedent parasites were E. excisus , O. siluri and D. were used. All organs of the fish were examined, except spathaceum (D = 1.87%, 1.23% and 1.22%, respectively) and blood. Live trematodes and acanthocephalans were relaxed subrecedent parasites were cestodes ( S. siluri , Bothriocepha- in distilled water at 4 0C for 1 h and fixed in 10% hot buffered lus sp. and P. osculatus ), A. lucii and A. foliaceus (D = 0.69%, formalin. Live nematodes were fixed in hot 70% ethanol and 0.01% and 0.01%, respectively). cleared in hot lactophenol. All specimens fixed in 10% for- The prevalence (P), mean intensity of infection (MI), range and malin were stained with aqueous acetocarmine, dehydrated mean abundance (MA) of the parasites are presented in Table and mounted in Permount. The worms were identified using 1. As shown in Table 1, monogeneans, S. vistulensis and S. si- parasite identification keys (Yamaguti, 1961; Bykhovskaya- luri, had the highest prevalence values (98.84%) in S. glanis . Pavlovskaya et al., 1962; Moravec, 1994) and then were de- The mean intensity of infection and abundance of these para- posited at the Laboratory of Fish Diseases, Faculty of Natu- sites (134.42 and 134.42, respectively) were also higher than ral Resources, University of Guilan, Iran. the others. Prevalence, mean intensity of infection and abun- Classical epidemiological variables (prevalence, intensity dance of R.
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