Seasonal variations of heavy metals in some organs of carp (Cyprinus carpio L., 1758) from Beysehir Lake (Turkey).

In this study which was carried out between March 2003 and February 2005 Fe, Cu, Zn, Mn, Cr, Pb and Cd contents were determined in muscle, liver and gill of carp (Cyprinus carpio L., 1758) caught from Beysehir Lake. Among the heavy metals analyzed Cr, Pb and Cd were below the detection limit (<0.03). Heavy metal concentrations varied significantly depending on the type of the tissue and season. The highest metal concentrations were found in the liver, followed by gill and muscle. Heavy metal levels in tissues of carp were increased in summer and winter, while were decreased in autumn and spring. The present study shows that precautions need to be taken in Beysehir Lake in order to prevent heavy metal pollution that can occur in the future.

Helminth infections in common carp, Cyprinus carpio L., 1758 (Cyprinidae) from Kovada Lake (Turkey).

The aim of this study which was carried out from March 2003-February 2004 was to determine the parasites of carp (Cyprinus carpio L., 1758) inhabiting the Kovada Lake. During the study, a total of 63 common carps were caught in different regions of Kovada Lake each month and investigated parasitologically. In carps, the ectoparasite, Dactylogyrus minutus of Monogenea, was found and endoparasites; Bothriocephalus acheilognathi and Caryophyllaeus laticeps of Cestoda were found. The most common parasitic species was Dactylogyrus minutus.

[The effects of parasites on the growth of the crucian carp (Carassius carassius L., 1758) inhabiting the Kovada Lake]. / Kovada gölü'nde yasayan havuz baligi (Carassius carassius L., 1758)'ndaki parazitlerin büyümeye etkisi.

The aim of this study carried out between March 2003-February 2004 was to determine the effects of parasites on the growth of the crucian carp (Carassius carassius L., 1758) inhabiting the Kovada Lake. A total of 102 specimens were caught monthly and investigated parasitologically. The age distribution of these fish were found to be between 3-7 years and 54 (52.9%) were infected by the various parasites. Investigations of fish that were caught during the same month of the same sex and of the same age revealed that infected fish were both shorter and lighter than uninfected ones, 7.7% and 9.3% respectively,.

Accumulation of some heavy metals in Raphidascaris acus (Bloch, 1779) and its host (Esox lucius L., 1758).

Concentrations of some heavy metals (Fe, Zn, Cu, Mn and Cr) in liver of pike (Esox lucius L., 1758) and its endoparasite [Raphidascaris acus (Bloch, 1779)] inhabiting Isikli Lake (Turkey) were analyzed using atomic absorption spectrophotometry. Only Fe and Zn were detected in R. acus and liver of fish, while levels of Cu, Mn and Cr were below detection limit (<0.028). The Fe and Zn level in R. acus were 68.4 and 86.9 times higher than in the liver. Nematodes could provide reliable information about the heavy metal pollution of the lakes.

[An investigation of parasites of tench (Tinca tinca L., 1758) in Beysehir Lake]. / Beysehir Gölü kadife baligi (Tinca tinca L., 1758)'nin parazitleri üzerine bir arastirma.

The aim of this study that was carried out from March 15, 2003 to February15, 2005 was to determine the parasites of tench (Tinca tinca L., 1758) inhabiting the Beysehir Lake. During the study, a total of 334 tenches (T. tinca ) were caught in different regions of Beysehir Lake monthly and investigated parasitologically. Endoparasites in tenches were found to be plerocercoids of Ligula intestinalis, Caryophyllaeus laticeps, Bothriocephalus acheilognathi and Proteocephalus torulosus from Cestoda, Asymphylodora tincae from Digenea and Acanthocephalus anguillae from Acanthocephala. Of these parasites, Acanthocephalus anguillae has been recorded for the first time in the tenchs of Turkey.

Comparative study on the accumulation of heavy metals in different organs of tench (Tinca tinca L. 1758) and plerocercoids of its endoparasite Ligula intestinalis.

Concentrations of heavy metals (Cu, Fe, Zn, Mn, Cr, Pb and Cd) in some organs of tench and tissues of its parasite found in Kovada Lake (Turkey) were analyzed using atomic absorption spectrophotometry and subsequently compared with the data from sediments and water. Only Cu, Fe, Zn and Mn were detected in water, sediment, plerocercoids of Ligula intestinalis and fish samples, while levels of Cr, Pb and Cd were below the detection limits. Four elements were found at higher concentrations in the plerocercoid than in different fish tissues (muscle, liver and gill), being 1.6-37.4 times higher than that measured in muscle, liver and gill. Significant positive (for Cu) and negative (for Fe, Zn and Mn) correlations were found between the quantity of heavy metals in water and tissues of L. intestinalis plerocercoids while there were significant positive (for Cu and Zn) and negative (for Fe and Mn) correlations between the quantity of heavy metals in bottom sediment and tissues of L. intestinalis plerocercoids. Cestodes were found suitable to reflect the amount heavy metals in sediments, providing more reliable information about the actual pollution of the reservoirs.

[Seasonal distributions and effects of parasites in pike (esox lucius l., 1758) inhabiting the isikli dam lake (Denizli).]. / Isikli baraj gölü (Denizli)'nde yasayan turna baligi (esox lucius l., 1758)'nin endoparazitleri, mevsimsel dagilimlari ve etkileri.

The aim of this study carried out from December 2000-November 2001 was to determine the endoparasites of pike (Esox lucius L., 1758) inhabiting the Isikli Dam Lake. A total of 160 samples were caught and investigated parasitologically. Bathybothrium rectangulum (Cestoda), Raphidascaris acus, Camallanus truncatus (Nematoda) and Neoechinorhynchus rutili (Acanthocephala) were detected as a result of this study. R. acus was the most prevalent species. The highest seasonal infection in the pike samples was determined to be 84.2% in the spring. The rates of infection are 40.4% in male pikes and 65.1% in females. According to age groups, the highest infection ratio has been determined to be 85.7% in pikes that were one year old. Investigations on samples caught during the same month and of the same age and gender showed that infected pikes were 2.5% shorter and 7.6% lighter than non-infected pikes. Among the parasites determined in this study, Bathybothrium rectangulum was detected for the first time in Turkish pike.

[An investigation of parasites of goldfish (Carassius carassius L., 1758) in Kovada Lake.]. / Kovada Gölü havuz baligi (Carassius carassius L., 1758)'nin parazitleri üzerine bir çalisma.

The aim of this study, carried out from 25.03.2003-17.02.2004, was to determine the ectoparasites and endoparasites of goldfish (Carassius carassius L., 1758) inhabiting Kovada Lake. A total of 102 specimens were caught monthly and investigated parasitologically. As a result of the investigation, the ectoparasites, Dactylogyrus anchoratus, Dactylogyrus minutus, Argulus foliceaus and Trachellobdella torquata, and the endoparasite Contracaecum sp. were found in the goldfish. Among these, Dactylogyrus minutus and Trachellobdella torquata have been recorded for the first time in goldfish in Turkey.