First record for invasive Topmouth gudgeon Pseudorasbora parva (Temminck and Schlegel, 1846) from Gokceada (Canakkale)

Pseudorasbora parva was found in the Gokceada Reservoir in the field study within the scope of the Biodiversity and Inventory Screening studies carried out in Canakkale, conducted on 08.06.2016. Despite the sea barrier, the presence of this species in Gokceada is a very clear evidence of the expansion of the invasive species by anthropogenic effects. Morphometric measurements of this invasive species, which is easy to adapt to the inland waters and spread rapidly, was made and it was reported that this species firstly existed in Aegean islands.