Artificial dietary regime may impair subsequent foraging behaviour of hatchery‐reared turbot released into the natural environment

• Published in: Journal of Fish Biology
• Main Authors: Ellis, T., Hughes, R. N., Howell, B. R.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 2002
• Subjects: Scophthalmus maximus; Turbot
• Online Access: http://dx.doi.org/10.1111/j.1095-8649.2002.tb01750.x; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.2002.tb01750.x; https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.2002.tb01750.x

When offered a size range of shrimp Crangon crangon , fewer naïve reared turbot Scophthalmus maximus fed than did wild fish, and those that fed took smaller prey. Analysis of feeding behaviour indicated differences between wild and naïve reared fish in the motivation to feed on novel prey and in prey recognition and capture efficiency. Feeding efficiency and motivation increased with experience and reared fish achieved the feeding rate of wild fish within the 9 days of the experiment. The ‘creep’ style of approach to shrimp was innate to naïve reared turbot. A comparative feeding experiment confirmed that experienced reared fish ate more prey than naïve reared fish. Naïve reared turbot selected pellets and attacked stones preferentially to shrimp, in contrast to wild and experienced reared fish, which selected shrimp. Stones were attacked due to the memory of pellet‐like visual characteristics and this behaviour persisted in some reared fish for at least 6 weeks, illustrating a cost of memory in which changing environmental conditions cause previously learnt information to become misleading. The experimental data also demonstrated that differences may arise in the prey and feeding behaviour of wild and naïve reared fish, but that such differences diminish with experience.