ÖZGÜR EMİROĞLU, Ali Serhan TARKAN, Nildeniz TOP, Sercan BAŞKURT, Şule SÜLÜN

Growth and life history traits of a highly exploited population of non- native gibel carp, Carassius gibelio from a Large Eutrophic Lake (Lake Uluabat, NW Turkey): is reproduction the key factor for establishment Success?

Yabancı bir tür olan gümüşi havuz balığı, Carassius gibelionun aşırı bir avcılık baskısı ile avlandığı Uluabat Gölündeki yerleşme başarısını anlayabilmek amacıyla, bu balığın biyolojik özellikleri ve populasyon yapısı Haziran 2009 ile Mayıs 2010 tarihleri arasında incelenmiştir. Ayrıca, elde edilen bulgular bu balığın doğal olarak ve aşılanmış olarak bulunduğu bölgelerdeki populasyonları ile karşılaştırılmıştır. Gümüşi havuz balığının Uluabat Gölündeki ticari avcılığı bu balığın populasyonunu etkilememiş ancak 12 yaş grubu ile doğal ve aşılanmış alanlardan karşılaştırma yapılan populasyonlar arasında en uzun yaşama ve en ağır büyümeye sahip populasyon olduğu görülmüştür. Üreme mevsimi Mart ile Mayıs ayları arasındadır. Doğal alanı dışındaki bölgeler içinde, bu balığın Uluabat populasyonu cinsi olgunluğa daha erken erişmiş ve nispi fekonditesi daha yüksek olarak bulunmuştur. Yüksek üreme yatırımı, erken cinsi olgunluğa erişme, yüksek nispi fekondite ve gonadosomatik indeks değerleri ile ortaya çıkmış ve ginogenetik üreme stratejisi ile birlikte bu balığın Uluabat Gölündeki yerleşme başarısı için anahtar faktör olabileceği sonucuna varılmıştır.

Büyük Ötrofik bir Gölden (Uluabat Gölü, Kuzey-Batı Türkiye) yüksek oranda sömürülen yabancı bir tür carassius gibelio populasyonun hayat döngüsü özellikleri ve büyümesi: Üreme, yerleşme başarısı için bir anahtar faktör mü?

To assess establishment success of a heavily exploited population of non-native gibel carp Carassius gibelio, biological traits and population structure of the species from a large eutrophic lake (Lake Uluabat, Turkey) were investigated from June 2009 to May 2010 and attributes were compared with the published information from the introduced and native range. Commercial harvesting of gibel carp did not seem to affect population size and viability of gibel carp in Lake Uluabat but it had one of the slowest growth rate represented by twelve age groups, and its life span was one of the longest recorded for the populations both in its natural and introduced areas. The reproductive season lasted from March to early May. Size at maturity was earlier and relative fecundity was higher than those in the introduced range. Higher investment in reproduction displayed by earlier maturation, higher relative fecundity and gonadosomatic index with gynogenetic spawning in Lake Uluabat is likely to be the key factor for establishment success of gibel carp.

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