Age, growth, sex ratio and feeding of Knipowitschia caucasica (Berg, 1916) (Actinopterygii, Gobiidae) in non-native species of Eğirdir Lake (Turkey)

Yıl 2017, Cilt: 30 Sayı: 1, 1 - 6, 30.03.2017

Salim Serkan Güçlü Ömer Erdoğan

Öz

The population structure of
Knipowitschia caucasica (Caucasian dwarf goby) in Lake Eğirdir (Turkey) was studied, using 400 fish
monthly in 2008. Males made up 45.75% (183), females 50.50% (202) and juveniles
3.75% (15) of the population. The length-weight relationship and Von
Bertalanffy growth equation were estimated as W=0.0141*L^2.769
(r=0.7464), W=0.0116*L^2.941 (r=0.8266) and W=0.0129*L^2.8494
(r=0.8039) for females, males and combined sexes, respectively. This species
can be mainly fed with Ochrophyta, Gammarus pulex and Ostracoda
organisms. There is a food
competition among Atherina boyeri, Aphanius anatoliae and K. caucasica that live mainly in coastal areas and share
the same environment. The species has become one of the
dominant fish of lake along with Carassius
gibelio
(non-native), A. anatoliae (native)
vs A. boyeri (non-native).

Anahtar Kelimeler

Anatolia, Exotic species, Competition, Population features

Kaynakça

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