J
Johan A.J. Verreth
Researcher at Wageningen University and Research Centre
Publications - 255
Citations - 10180
Johan A.J. Verreth is an academic researcher from Wageningen University and Research Centre. The author has contributed to research in topics: Clarias gariepinus & Catfish. The author has an hindex of 51, co-authored 251 publications receiving 8768 citations.
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Journal ArticleDOI
The impact of changing dietary Na/K ratios on growth and nutrient utilisation in juvenile African catfish, Clarias gariepinus
TL;DR: Excess K in the diet depresses growth and nutrient utilisation efficiency, reduces body fat and protein deposition, and produces the best growth of African catfish.
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A note on alarm cues in juvenile African catfish, Clarias gariepinus Burchell: Indications for opposing behavioural strategies
TL;DR: Following exposure of African catfish to alarm cues, a relationship between feed efficiency (measured as residual feed intake) and the change in percentage of time spent swimming in response to damage-released alarm cues was observed.
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The effect of low pH on physiology, stress status and growth performance of turbot (Psetta maxima L.) cultured in recirculating aquaculture systems
Vasco C. Mota,Jochem Hop,Luís André Sampaio,L.T.N. Heinsbroek,Marc C.J. Verdegem,Ep H. Eding,Johan A.J. Verreth +6 more
TL;DR: In conclusion, turbot grew equally well in a water pH of 7.5 or 5.7, which provided a low TAN, and low pH combined with a high TAN impaired turbot performance.
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Environmental conditions alter the effect of organic acid salts on digestibility and intestinal morphology in Nile tilapia (Oreochromis niloticus)
Kim T. Tran-Ngoc,Kim T. Tran-Ngoc,Son T. Huynh,João Sendão,Thinh H. Nguyen,Arjen J. Roem,Johan A.J. Verreth,Johan W. Schrama +7 more
TL;DR: Experimental findings suggest that OAs can improve the nutrient digestibility and intestinal morphology under hypoxic conditions, and a synergistic effect by the combination of formic and butyric acid on growth, digestibilityand intestinal morphology was not found.
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The influence of dietary cation-anion differences on acid-base balance, food intake, growth and nutrient utilisation of juvenile African catfish, Clarias gariepinus (Burchell)
TL;DR: The results suggest that dietary CAD influence acid-base regulation and thus the energy costs for maintaining homeostasis as well as the increased food intake and growth performance of C. gariepinus at higher CAD levels may be related to a reduced maintenance costs forHomeostasis.