Details

Autor(en) / Beteiligte

• Gilannejad, Neda
• Silva, Tomé
• Martínez-Rodríguez, Gonzalo
• Yúfera, Manuel

Titel

Effect of feeding time and frequency on gut transit and feed digestibility in two fish species with different feeding behaviours, gilthead seabream and Senegalese sole

Ist Teil von

• Aquaculture, 2019-11, Vol.513, p.734438, Article 734438

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A comparative approach was adopted to assess the effect of different feeding strategies on feed transit and daily oscillations of apparent digestibility coefficients (ADCs) of dry matter, protein, and energy, in two species with different feeding habits, gilthead seabream and Senegalese sole. For this purpose, fish juveniles were consecutively fed with a standard and a marked diet (yttrium oxide) and were sampled at difference post-prandial times. Mathematical models were constructed to predict filling and evacuation of the stomach and intestine in gilthead seabream, and the whole digestive tract in Senegalese sole. Results demonstrated that changes in daily feeding time and frequency, modified the feed transit rate and residence time in the gut as well as the apparent digestibility, with obvious consequences for the utilization of nutrients. Variations in apparent digestibility were also observed along the daily cycle. Besides, the obtained response varied significantly depending on the studied fish species, due to the interspecific differences in the anatomy, digestive physiology, and feeding habits. Allocating the whole daily meal in one ration resulted in fast gut filling rate and low apparent digestibility in both species. In gilthead seabream, feeding protocol did not influence the stomach and intestine evacuation rates. However, in Senegalese sole, frequent meals during the whole daily cycle resulted in a faster gut evacuation. Very frequent diurnal feeding led to highest ADCs in both species; although, such higher digestibility values were not necessarily related to longer feed residence times within the gut in gilthead seabream. The results obtained from this study can be useful to establish optimized feeding protocols that help to reduce the production costs and undigested debris in the effluents. •Daily feeding strategy, in terms of timing and frequency, modulates the transit pattern and utilization of nutrients in the gut•Apparent digestibility of nutrients and energy shows clear fluctuations along the daily cycle•Fish response to daily feeding protocol largely depends on the species-specific feeding habits and anatomy of the digestive system