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THE OCCURRENCE of Ligula Intestinalis in ITS FISH HOST Rutilus Rutilus (L.) and the EFFECTS of PARASITE on the FISH GROWTH (BÜYÜKÇEKMECE RESERVOIR, TURKEY)

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THE OCCURRENCE of Ligula Intestinalis in ITS FISH HOST Rutilus Rutilus (L.) and the EFFECTS of PARASITE on the FISH GROWTH (BÜYÜKÇEKMECE RESERVOIR, TURKEY) ORIGINAL ARTICLE/ORİJİNAL ÇALIŞMA FULL PAPER TAM MAKALE THE OCCURRENCE OF Ligula intestinalis IN ITS FISH HOST Rutilus rutilus (L.) AND THE EFFECTS OF PARASITE ON THE FISH GROWTH (BÜYÜKÇEKMECE RESERVOIR, TURKEY) Gülşah SAÇ1, Elif Ece SEREZLİ2 and Hacer OKGERMAN3 1, 2 Natural and Applied Sciences Institute, Istanbul University, Fatih, Istanbul, Turkey 3Istanbul University, Faculty of Fisheries, Laleli, İstanbul, Turkey Corresponding author: Received: 10.04.2015 Gülşah SAÇ, Natural and Applied Sciences Institute, Istan- Accepted: 23.11.2015 bul University, Fatih, Istanbul, Turkey Published online: 20.04.2016 E-mail: [email protected] Abstract: while prevalence (%) was 32.31% in July and mean Roach Rutilus rutilus (Linnaeus, 1758) is a very com- intensity of plerocercoids is 6.0 in October. Statistical- mon fish species for Turkish inland waters, especially ly significant differences between K values of non- in Büyükçekmece Reservoir (İstanbul). The species is infected and infected specimens among length groups one of the most caught fish species and holds econom- and months were recorded (Mann-Whitney U Test, ic consumption value even though it is mostly infected p<0.05). Results showed that, L. intestinalis plerocer- by Ligula intestinalis (Linnaeus, 1758), a pseudophyl- coids seem to be affected significantly on the condi- lidean cestode causing severe pathological effects on tion and body health of its host R. rutilus. fishes. The aim of the study was to determine the presence of L. intestinalis plerocercoids in its fish host Keywords: Plerocercoid, Condition, Intensity, Parasite- R. rutilus and investigate the effects of the parasite on host index, Prevalence the condition of the fish. With this purpose, the fish specimens have captured from Büyükçekmece Reser- voir with using gillnets having different mesh sizes (10×10 mm, 20×20 mm, 30×30 mm, 40×40 mm and 50×50 mm) from March 2009 to February 2010. The fork length and body weight of fish specimens (n=1857) were varied between 6.0–29.2 cm and 2.53– 561.00 g, respectively. In total, 4.52% of specimens were infected by the plerocercoids. Infection by L. in- testinalis was observed during summer, autumn and winter months but not spring. Parasite-host index (PSI %), prevalence (%) and mean intensity of plerocer- coids for infected fishes were calculated, monthly. PSI (%) was estimated maximum in January as 18.49% JOURNAL OF AQUACULTURE ENGINEERING AND FISHERIES RESEARCH E-ISSN 2149-0236 2(3): 142-150 (2016) doi: 10.3153/JAEFR16016 142 © 2015-2016 ScientificWebJournals (SWJ) Journal of Aquaculture Engineering and Fisheries Research Saç et al., 2(3): 142-150 (2016) Journal abbreviation: J Aquacult Eng Fish Res Introduction Fish is very important protein sources as food be- the present study is to determine the occurrence sides their importance for the economies of coun- of the parasites on host and investigate the effects tries and being an object of sportive and orna- of parasite for condition and length–weight rela- mental fishing. Besides direct losses caused by tionship of host fishes living in Büyükçekmece mortality, parasites may have considerable im- Reservoir. pact on growth and fish behavior, their resistance Materials and Methods to other stressing factors, susceptibility to preda- tion, etc.; their presence may also reduce market- The present study was carried out in Büyükçek- ability of fish (Scholz, 1999). In Turkish inland mece Reservoir between March 2009 and Febru- waters, especially in Marmara Region, roach Ru- ary 2010. During the monthly sampling surveys, tilus rutilus (L.) is very common and has an eco- gillnets (50 m length and 2.5 m depth) having nomical value (Geldiay and Balık, 2007). Its first different mesh size (10×10 mm, 20×20 mm, record for Büyükçekmece Reservoir is given in 30×30 mm, 40×40 mm and 50×50 mm) were 1986 (Meriç, 1986) and now it’s one of the most used for fishing. Fish specimens were measured dominant fish species of the reservoir. to the nearest 0.1 cm (fork length, FL) and 0.01 g (body weight, W), and then dissected to deter- Ligula intestinalis (L., 1758) is a pseudophyllide- mine the number and weight of plerocercoid lar- an cestode which is known to induce severe val forms of parasites occurring in the abdominal pathological effects on fish (Ergönül and cavity. Prevalence (%) and mean intensity were Altındağ, 2005; Loot et al., 2001) and the most calculated according to Bush et al. (1997). Para- common infection parasite reported in Turkish site-host index (PSI %) was calculated according inland waters (İnnal et al., 2007). Ligulids have a to Kesler et al. (2009). Variations of prevalence complex life cycle involving copepods, fishes (%), mean intensity and PSI (%) among months and birds. Firstly, the coracidium larva surviving and length groups were examined. 1-2 days in the water penetrates the gut wall of a copepod and develops into a procercoid. The in- The length–weight relationship was calculated fected copepod is ingested by a planktivorous cy- using the equation "W = a*Lb", where W is the prinid fish (e.g. R. rutilus), and the parasite lar- total weight (g), L is the fork length (cm), and a vae develop into the plerocercoid stage in the and b are the equation parameters (Le Cren, body cavity. The definitive host is an ichtyopha- 1951; Froese, 2006). Fish condition was assessed gous predatory bird in which L. intestinalis by Fulton’s Condition Factor "K=(W/L3)*100" reaches sexual maturity. Parasite eggs are then (Ricker, 1975) for infected (without plerocer- released into the water with bird faeces (Loot et coids) and non–infected specimens. All statistical al., 2001; İnnal et al., 2007). analyses were performed with SPSS software 16.0. Prior to statistical analysis, all data were Infection with L. intestinalis effects cultured or tested for normality of distribution using the free–living fish of freshwater in all over the Kolmogornov–Smirnov test. Mann Whitney U world (Shargh et al., 2008). It has been reported test was performed to test the differences be- from a broad range of fish families, such as Cy- tween the length, weight and condition values of prinidae, Cobitidae, Salmonidae, Esocidae, Pleu- infected and non-infected fish among months and ronectidae or Siluridae (İnnal et al., 2007; Bouzid length groups (Zar, 1999). et al., 2008). It is known to effect especially Al- burnus escherichii, Leuciscus cephalus, Tinca Results and Discussion tinca, Cyprinus carpio, R. rutilus which are In present study, a total of 1857 R. rutilus speci- members of the Cyprinidae (Loot et al., 2001; mens, captured from the Büyükçekmece Reser- Ergönül and Altındağ, 2005; İnnal et al., 2007). voir, were investigated and the results showed According to Williams and Hoole (1992), nu- that 84 of the 1857 fishes (4.52%) were infected merous ecological and pathological studies have by plerocercoids. The fork length ranged from revealed that the parasite can seriously affect the 6.5 to 25.0 cm for infected specimens while it population dynamics of both wild fish and those was between 6.0 and 29.2 cm for non-infected involved in aquaculture. There is limited data on specimens. Total weight ranged between 3.66 relation of the parasite and its fish host R. rutilus and 327.30 g for infected fish and 2.53 and (Kennedy and Burrough, 1981; Loot et al., 2001; Oğuz et al., 2004; Carter et al., 2005). The aim of 143 Journal of Aquaculture Engineering and Fisheries Research Saç et al., 2(3): 142-150 (2016) Journal abbreviation: J Aquacult Eng Fish Res 561.00 g for non-infected fish, respectively increased steadily from winter to summer and au- (Table 1). tumn except spring. In Yenice Irrigation Pond (Turkey), the maximum density of this parasite Infection by L. intestinalis was observed during has occurred in July. Similarly, in present study, summer, autumn and winter months but not infection wasn’t observed in spring and the max- spring. The maximum infection rate was deter- imum infection rate was determined in July while mined in July while it was lower during the au- it was lower during the autumn and winter. tumn and winter (Figure 1). Parasite-host index (PSI %), prevalence (%) and mean intensity of The condition factor of infected fishes is signifi- plerocercoids for infected fishes were calculated cantly lower than that of healthy ones (Mahon, among months (Table 2) and length groups 1976). In present study, a similar result was mon- (Table 3). PSI (%) was estimated maximum in itored as condition factor of infected fishes is January as 18.49% while prevalence (%) was significantly lower from the non-infected speci- 32.31% in July and mean intensity of plerocer- mens (Table 3 and Table 4). The parasite may coids was 6.0 in October. have changed the food intake of the host and so, the condition as an indicator of feeding intensity The condition factors of non-infected and infect- of fish was effected negatively. Also, many re- ed specimens (without plerocercoids) specimens searchers have studied some effects of this para- are given at Table 1. Statistically significant dif- site for fish host such as growth, endocrine sys- ferences between K values of non-infected and tem, gonadal development and had determined infected specimens among length groups and that L. intestinalis was caused many pathogenic months were recorded (Mann-Whitney U Test, effect on host fish. The parasite can cause dam- p<0.05). Differences between K values for non- age to the host fish specimens especially by com- infected and infected specimens among length pression and atrophy of vital organs including the groups and months are shown in Table 3 and Ta- gonads, liver in the coelomic cavity of the infect- ble 4.
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