hrvatski

Length-weight relationships and condition between invasive and native populations of topmouth gudgeon Pseudorasbora parva.

In recent years, fish invasion has become one of the main reasons for the decline of native fish stocks. Topmouth gudgeon Pseudorasbora parva (Temminck & Schlegel, 1846) is a small fish native to Eastern Asia and introduced to Europe as well as to Croatia. It typically inhabits small ponds and ditches, but also larger lakes and streams. P.parva is considered one of the major invasive species worldwide, thus it is included in list of Invasive Alien Species of Union concern by EU Regulation 1143/2014 on Invasive Alien Species, which took effect 1 January 2015. High phenotypic plasticity in fitness related traits such as growth, early maturity, fecundity, reproductive behaviour and the ability to cope with novel pathogens has predisposed P. parva to being a strong invader. Species-specific length-weight relationships (LWR) and (K) condition factors is important for the study of fish population invasive biology and dynamics, as it allows to estimate the weight corresponding to a given length, condition factors for comparing the condition, fatness, or well-beingof fish, based on the assumption that heavier fish of a given length are in better condition. Until today LWR and K parameters for P.parva have been restricted only to a certain study area and still there is no any wider analysis provided. The aim of the present study was therefore to provide a comparison of LWR and K for P. parva stocks from Croatian and Chinese freshwaters from own data as well as based on an extensive collection of literature data. The work was supported by the bilateral research project Croatia-China funded by Ministry of Science and Education.

invasive fish ; invasive biology ; population fitness

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