THE OCCURRENCE OF Ligula intestinalis IN ITS FISH HOST Rutilus rutilus (L.) AND THE EFFECTS OF PARASITE ON THE FISH GROWTH (BÜYÜKÇEKMECE RESERVOIR, TURKEY)

Year 2016, Volume: 2 Issue: 3, 142 - 150, 20.04.2016

Gülşah Saç , Elif Ece Serezli Hacer Okgerman

https://doi.org/10.3153/JAEFR16016

Abstract

Roach Rutilus rutilus (Linnaeus,
1758) is a very common fish
species for Turkish inland waters, especially in Büyükçekmece Reservoir
(İstanbul). The species is one
of the most caught fish species and holds economic consumption value even
though it is mostly infected by Ligula intestinalis (Linnaeus,
1758), a pseudophyllidean cestode causing severe pathological effects on
fishes. The aim of the study was to determine the presence of L. intestinalis plerocercoids in its
fish host R. rutilus and investigate
the effects of the parasite on the condition of the fish. With this purpose,
the fish specimens have captured from Büyükçekmece Reservoir 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. intestinalis was observed during
summer, autumn and winter months but not spring. Parasite-host index (PSI %), prevalence (%) and mean
intensity of plerocercoids for infected fishes were calculated, monthly. PSI
(%) was estimated maximum in January as 18.49% while prevalence (%) was 32.31%
in July and mean intensity of plerocercoids is 6.0 in October. Statistically significant
differences
between K values of non-infected and infected specimens among length groups and
months were recorded (Mann-Whitney U Test, p<0.05). Results showed that, L. intestinalis plerocercoids seem to be affected significantly on
the condition and body health of its host R.
rutilus. 

Keywords

Plerocercoid, Condition, Intensity, Parasite-host index, Prevalence

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