Personality traits and behaviour vary among invasive, native and hatchery-reared fish

Bold behaviour of non-native species is hypothesised to facilitate invasion success, yet extreme boldness in other wild and domesticated animals can be maladaptive. The purpose of this study was to compare individual behaviour among Australian native hatchery-reared (n=33) and wild (n=38) Murray cod (Maccullochella peelii) with globally invasive common carp (Cyprinus carpio; n=30). Three laboratory tests measured individual behaviour: 1) emergence from a shelter; 2) exploration of a novel environment and 3) approaching a predator. Wild invasive carp and hatchery-reared cod were faster and more likely to emerge and explore novel environments when compared to wild Murray cod. The ‘bold-type’ behaviours of hatchery-reared native cod were more like invasive carp than they were to ‘shy-type’ wild conspecifics, yet an important difference was that hatchery-reared cod spent substantially more time near a large predator while carp rapidly escaped.  Our results provide novel evidence of bold-typ..., The subjects of this study consisted of juvenile hatchery and wild sourced Murray cod (Maccullochella peelii) and juvenile wild carp (Cyprinus carpio). Experiments were conducted on: young of year (YOY) hatchery Murray cod (n=19); one year old (1+) hatchery Murray cod (n=14); YOY wild Murray cod (n=17); 1+ wild Murray cod (n=21) and YOY wild carp (n=19) and 1+ wild carp (n=11). Fish age was determined at the end of experiments by removing and sectioning otoliths using traditional methods by experienced readers at Fish Aging Services Pty Ltd.  The hatchery fish were 2nd generation from wild-caught breeding stock from the same southern Murray-Darling basin genetic population and sourced from Uarah fisheries (Grong Grong, New South Wales). Wild Murray cod were collected by boat electrofishing and seining in canals of the Goulburn and Murray rivers in Victoria, Australia. Carp were collected from the Goulburn and Murrumbidgee river in New South Wales, Australia. 
We used three common method..., , # Personality traits and behaviour vary among invasive, native and hatchery-reared fish

[https://doi.org/10.5061/dryad.v41ns1s0h](https://doi.org/10.5061/dryad.v41ns1s0h)

## Description of the data and file structure

The subjects of this study consisted of juvenile hatchery and wild sourced Murray cod (*Maccullochella peelii*) and juvenile wild carp (*Cyprinus carpio*). Experiments were conducted on: young of year (YOY) hatchery Murray cod (n=19); one year old (1+) hatchery Murray cod (n=14); YOY wild Murray cod (n=17); 1+ wild Murray cod (n=21) and YOY wild carp (n=19) and 1+ wild carp (n=11). Fish age was determined at the end of experiments by removing and sectioning otoliths using traditional methods by experienced readers at Fish Aging Services Pty Ltd.  The hatchery fish were 2nd generation from wild-caught breeding stock from the same southern Murray-Darling basin genetic population and sourced from Uarah fisheries (Grong Grong, New South Wales). Wild Murray cod were collected...