Rapid growth of Atlantic salmon juveniles in captivity may indicate poor performance in nature

Publication year: 2011
Source: Biological Conservation, In Press, Corrected Proof, Available online 2 July 2011</br>
Arto, Saikkonen , Jukka, Kekäläinen , Jorma, Piironen</br>
The hatchery environment often favours completely different traits than natural selection in the wild. Consequently, hatchery-reared fish are usually larger and more aggressive than their wild counterparts. Increased growth rate and aggression are predicted to be beneficial in feeding competition in hatcheries, but not necessarily in nature, where food resources are spatially and temporally more variable. We compared the growth, condition and mortality of landlocked Atlantic salmon (Salmo salar L.) juveniles in a common hatchery environment and when feeding on natural prey in semi-natural channels. We found that the growth and survival probability of the fish in the hatchery was...</br>
*Highlights:*? We compared the performance of Atlantic salmon juveniles in hatchery environment and in the semi-natural channels. ? Fish growth and survival in the hatchery was negatively associated with their performance in the semi-natural channels. ? Thus, good performance during hatchery rearing may indicate reduced performance in food-limited natural conditions. ? Selective stocking of the most successful hatchery phenotypes may not be best strategy to conserve wild salmonid populations.</br></br>

2nd July 2011 21:17

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