Consistency in the life history traits of four invasive <i>pseudorasbora parva</i> populations in Southern England

Life history plasticity can be a strong predictor of the establishment and invasion success introduced fishes. Here, life-history traits four P. parva populations in adjacent ponds Southern England were measured throughout 2013 to determine timing length their reproductive season extent trait plasticity. The relative abundance (as catch per unit effort) was similar, with low variability relating effort somatic growth. All male dominated. Both sexes matured at small body sizes, fish as 30 mm being mature both sexes, age maturity for 1+ years. peak spawning period, characterised by female investing heavily reproduction when gonado-somatic index (GSI) values highest declined thereafter, occurred May June, after mean 212 ± 24 degree-days >12°C, water temperatures 13.2–14.6°C. There no further peaks GSI, despite species considered have prolonged periods across spring summer. These results also suggest that whilst expression invasive fishes often vary density, they highly consistent between similar abundances locations.