Wild-caught fish are more easily stressed than captive-breds.

Aquaculture   Volume 321, Number 3-4 (December 2011)     

A non-invasive assay for monitoring stress responses: A comparison between wild and captive-reared rainbowfish (Melanoteania duboulayi)    

Authors: Amina Zuberi, Sinan Ali, Culum Brown     Author Affiliations:

Source: Aquaculture, Volume 321, Number 3-4 (December 2011)     Page Numbers: 267 – 272      Available Full Text:

Abstract: The stress response of wild and captive reared rainbowfish (Melanoteania duboulayi) following chasing by a simulated predator was examined. Cortisol release rate was monitored using a flow through system by measuring water borne hormone levels. Tests using known cortisol concentrations revealed that the technique yielded 95% of the cortisol present in the water. Cortisol release rates increased several fold in both populations after being chased but peaked at different time periods. Wild fish showed a typical stress response with release rate rising to (2.29±0.22ngg-1h-1) 2h after exposure followed by rapid recovery. The captive-reared population by contrast showed an atypical response with cortisol release rate peaking 4h post exposure but reaching only half the level of the wild fish (1.19±0.11ngg-1h-1). The implications for the release of hatchery-reared fish for stock enhancement are discussed.      Citation: Amina Zuberi, Sinan Ali, Culum Brown . A non-invasive assay for monitoring stress responses: A comparison between wild and captive-reared rainbowfish (Melanoteania duboulayi). Aquaculture, Volume 321, Numbers 3-4 (December 2011), pp. 267-272, <http://ejournals.ebsco.com/direct.asp?ArticleID=43498EAFD18D5EF408E8&gt;