Abstract
Age composition, length-weight relationships, growth, and condition factors of the gibel carp (Carassius gibelio Bloch, 1782) were determined using specimens collected from Seyitler Reservoir between July 2005 to June 2006. A total of 149 gibel carp were observed and examined. The age composition of the samples ranged between I and VII years of age. It has been determined than 82.55% of the obtained samples are comprised of females, 16.11% is comprised of males and 1.34% is comprised of immature. The population is dominated by females able to reproduce gynogenetically. The mean fork lengths and mean weights of the population were 14.8-32.5 cm and 43.1-807.3 g respectively. The length-weight relation were calculated as W = 0.0696 L2.132, r=0.838 for females, for males W = 0.2942 L2.6417 r=0.784 and W = 0.0274 L2.9382, r=0.813 for all samples. The mean Fulton Condition Factor was calculated as 2.342 for females, 2.064 for males and 2.276 for all samples. Age-length and age-weight relations were determined according to von Bertalanffy growth equation formula. Growth parameters of the population were Lt = 48.09 [1-e-0.093(t+0.29)], and Wt=2323.62 [1-e-0.093(t+0.29)]2.9382. The growth performance index value (Ø´) was computed as 5.37 for all specimens.
Highlights
Introduction of fish in freshwater ecosystems is frequently considered a practical application of fisheries management in many countries
C. gibelio (Kırankaya and Ekmekçi, 2013) is a typical example of introduced species. It is an omnivorous fish species which feeds on detritus, zooplankton, zoobenthos and macrophyta (Specziar et al, 1997) and continues to expand its distribution area in fresh water environments
The presence of gibel carp in the Turkey was not recognized until the 1980s (Baran and Ongan, 1988), probably due to its strong ppheotypicalotypical resemblance to the Carassius species introduced to Turkey: crucian carp Carassius carassius (L., 1758), and goldfish Carassius auratus (L., 1758)
Summary
Introduction of fish in freshwater ecosystems is frequently considered a practical application of fisheries management in many countries. C. gibelio (Kırankaya and Ekmekçi, 2013) is a typical example of introduced species. It is an omnivorous fish species which feeds on detritus, zooplankton, zoobenthos and macrophyta (Specziar et al, 1997) and continues to expand its distribution area in fresh water environments. C. gibelio was introduced to Europe from Asia in the 17th century It has been already established in at least 12 European countries and range expansion of the freshwater system of Turkey (Özuluğ et al, 2004; Vetemaa et al, 2005; Özcan, 2007). With developments in the identification of Carassius species, distribution of crucian carp in Turkey is presently thought to include both the Thrace region and the entire Anatolian Peninsula (Gaygusuz et al, 2007)
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