Rahman, M.M., Verdegem, M.C.J., Nagelkerke, L.A.J., Wahab, M.A., Milstein, A., Verreth, J.A.J.
The effects of introducing common carp (CC) and of adding artificial feed to fertilized rohu ponds on water quality and nutrient accumulation efficiency were studied. All ponds were stocked with 15...
Tran Duy, A., Schrama, J.W., Verreth, J.A.J.
Feed intake and satiation in fish are regulated by a number of factors, of which dissolved oxygen concentration (DO) is important. Since fish take up oxygen through the limited gill surface area, all...
Rahman, M.M., Nagelkerke, L.A.J., Verdegem, M.C.J., Wahab, M.A., Verreth, J.A.J.
We examined the influence of addition of common carp (Cyprinus carpio) and artificial feed in rohu (Labeo rohita) ponds. We analyzed the relationships among four datasets on different components of...
Phosphorus requirements of European eel Anguilla anguilla (2008)
Heinsbroek, L.T.N., Hariati, A.M., Schrama, J.W., Verreth, J.A.J.
Martins, C.I., Hillen, B., Schrama, J.W., Verreth, J.A.J.
Individual differences in maintenance levels have been related with energetically expensive processes such as aggression. This relationship is not fully understood as on one hand individuals with...
Adiposity killed the catfish' appetite (2008)
Heinsbroek, L.T.N., Rutjes, G.M., Schrama, J.W., Verreth, J.A.J.
Fish require relatively high dietary protein levels when compared with other farm animals. Because of the high price of protein and the environmental effects of nitrogen discharge, the protein...
Fishponds in farming systems (2007)
Verreth, J.A.J., Bosma, R.H., Beveridge, M.C.M.
Throughout the last century, specialisation and intensification were buzz words for farmers in the Western world. However, this approach has not resulted in sustainable development as evidenced by...
Roles of ponds in integrated agriculture-aquaculture systems (2007)
Muendo, P.N., Stoorvogel, J.J., Verdegem, M.C.J., Gamal, E-N., Verreth, J.A.J.
Schneider, O., Chabrillon-Popelka, M., Smidt, H., Haenen, O.L.M., Sereti, V., Eding, E.H., ...
In a recirculation aquaculture system the drumfilter effluent can be used as substrate for heterotrophic bacterial production, which can be recycled as feed. Because the bacteria might contain...
Uddin, S., Rahman, S.M.S., Azim, M.E., Wahab, M.A., Verdegem, M.C.J., Verreth, J.A.J.
The present research investigated the effect of stocking density on pond (75 m2, depth 1.2 m) production of Nile tilapia (Oreochromis niloticus) and freshwater prawn (Macrobrachium rosenbergii)...
Kinetics, design and biomass production of a bacteria reactor treating RAS effluent streams (2007)
Schneider, O., Sereti, V., Eding, E.H., Verreth, J.A.J., Klapwijk, B.
The kinetics and design of a suspended bacteria growth reactor, which can be integrated in a 100MT African catfish farm, were determined. Such a reactor converted nitrogen (N) and phosphorus (P) from...
Osman, A.G.M., Mekkawy, Imam A., Verreth, J.A.J., Kirschbaum, Frank
Glucose-6-phosphate dehydrogenase (G6PDH), lactate dehydrogenase (LDH) and pyruvate kinase (PK) are key metabolic enzymes. G6PDH has been used as a biomarker of pollution-induced carcinogenesis in...
Leenhouwers, J.I., Verreth, J.A.J., Schrama, J.W.
Inclusion of cereal grains in fish diets may induce changes in digesta characteristics with possible consequences for fish performance. Especially viscosity characteristics of the dietary ingredients...
Heinsbroek, L.T.N., Hooff, P.L.A., Swinkels, W., Tanck, M.W.T., Schrama, J.W., Verreth, J.A.J.
To examine the effect of feed composition on changes in feed intake and subsequent feed utilization with age, five populations of European eel, with an average initial body weight of 5 g each fed a...
Soybean meal-induced enteritis in Atlantic salmon (Salmo salar L.) at different temperatures (2007)
Urán Carmona, P.A., Schrama, J.W., Obach, A., Jensen, L., Koppe, W., ...
This study evaluates the effect of temperature on the development of intestinal disorders when Atlantic salmon are fed soybean meal (SBM). In this study 20% of the dietary fishmeal was replaced by...
Schneider, O., Sereti, V., Eding, E.H., Verreth, J.A.J.
The drumfilter effluent from a recirculation aquaculture system (RAS) can be used as substrate for heterotrophic bacteria production. This biomass can be re-used as aquatic feed. RAS effluents are...
Leenhouwers, J.I., Ortega, R.C., Verreth, J.A.J., Schrama, J.W.
Soluble non-starch polysaccharides (NSP) present in cereal grains may affect performance of Nile tilapia through changes in digesta characteristics. The objective of this study was to investigate...
Rahman, M.M., Verdegem, M.C.J., Nagelkerke, L.A.J., Wahab, M.A., Milstein, A., Verreth, J.A.J.
An experiment was carried out in 18 earthen ponds to investigate the effects of the addition of common carp Cyprinus carpio (L.) and artificial feed on natural food availability, food utilization and...
Bucio Galindo, A., Hartemink, R., Schrama, J.W., Verreth, J.A.J., Rombouts, F.M.
Lactobacilli are Gram-positive and catalase negative rods commonly found in lactic acid fermented foods and in the gastrointestinal tract of mammals and birds. Few studies have described lactobacilli...
Reducing water use for animal production through aquaculture (2006)
Verdegem, M.C.J., Bosma, R.H., Verreth, J.A.J.
Animals fed formulated diets indirectly consume large quantities of water. Globally, about 1.2 m3 of water is needed to produce 1 kg of grain used in animal feeds. Cattle in feedlots consume about 7...
The effect of group composition on the welfare of African catfish (Clarias gariepinus) (2006)
Martins, C.I., Schrama, J.W., Verreth, J.A.J.
Within fish farming grading, i.e. the process of sorting to approximate size, changes the group composition from heterogeneous to homogeneous. Although this procedure is considered an acute stressor,...
Amirkolaie, A.K., Verreth, J.A.J., Schrama, J.W.
Higher faeces removal efficiency can help and reduce the negative impact of faecal waste on water quality and on the environment. Physicochemical properties of feed ingredients/nutrients may change...
The potential of producing heterotrophic bacteria biomass on aquaculture waste (2006)
Schneider, O., Sereti, V., Machiels, M.A.M., Eding, E.H., Verreth, J.A.J.
The effluent from the drumfilter of a recirculation aquaculture system was used as substrate to produce heterotrophic bacteria in suspended growth reactors. The effects of organic carbon...
Design and operation of nitrifying trickling filters in recirculating aquaculture: a review (2006)
Eding, E.H., Kamstra, A., Verreth, J.A.J., Huisman, E.A., Klapwijk, A.
This review deals with the main mechanisms and parameters affecting design and performance of trickling filters in aquaculture. Relationships between nitrification rates and easily accessible process...
Martins, C.I., Schrama, J.W., Verreth, J.A.J.
Despite the importance of feed efficiency and stress response in fish production, the number of studies focusing on the relationship of their individual differences has never been investigated. This...
Decomposition of high protein aquaculture feed under variable oxic conditions (2006)
Torres Beristain, B., Verdegem, M.C.J., Kerepeczki, E., Verreth, J.A.J.
The microbial decomposition of nitrogen-rich organic matter in aquaculture ponds is affected by the oxic-anoxic conditions gradient at the soil¿water interface as well as by resuspension practices....
Leenhouwers, J.I., Adjei_Boateng, D., Verreth, J.A.J., Schrama, J.W.
The objective of the present study was to investigate if dietary soluble non-starch polysaccharides (NSP) increase digesta viscosity, reduce nutrient digestibility and increase organ weights in...
Martins, C.I., Trenovski, M., Schrama, J.W., Verreth, J.A.J.
This study shows that in African catfish Clarias gariepinus feed intake (IF) is stimulated by the presence of conspecifics resulting in higher IF and growth rate. The feeding duration and the...
Bacteria of commercial diet : the preferences of Litopenaeus vannamei (2006)
Schneider, O., Cong, T.L, Sereti, V., Schrama, J.W., Eding, E.H., Verreth, J.A.J.
Cost price and production strategies in European Recirculation Systems (2006)
Schneider, O., Blancheton, J.P., Varadi, L., Eding, E.H., Verreth, J.A.J.
A frame work model for integrated intensive aquaculture (2006)
Schneider, O., Sereti, V., Eding, E.H., Klapwijk, B., Verreth, J.A.J., Waller, U., ...
The project ZAFIRA (Zero discharge Aquaculture by Farming in Integrated Recalculating Systems in Asia) will focus on the combination of Western recalculating and traditional Chinese Techniques to...
Molasses as C source for heterotrophic bacteria production on solid fish waste (2006)
Schneider, O., Sereti, V., Eding, E.H., Verreth, J.A.J.
The drumfilter effluent from a recirculation aquaculture system (RAS) can be used as substrate for heterotrophic bacteria production. These bacteria can be reused as aquatic feed. In RAS drumfilter...
Nutrient and energy balances of Nile tilapia in recirculated systems (2006)
Xuejun, H., Sifa, L., Bai, Z., Schneider, O., Verreth, J.A.J.
Using fuzzy logic to simulate the composition of farming systems in the Mekong Delta (2006)
Bosma, R.H., Phong, L.T., Kaymak, U., Udo, H.M.J., Verreth, J.A.J.
Nhan, D.K., Milstein, A., Verdegem, M.C.J., Verreth, J.A.J.
A participatory on-farm study was conducted to explore the effects of food input patterns on water quality and sediment nutrient accumulation in ponds, and to identify different types of integrated...
Analysis of nutrient flows in integrated intensive aquaculture systems (2005)
Schneider, O., Sereti, V., Eding, E.H., Verreth, J.A.J.
This paper analyses nutrient conversions, which are taking place in integrated intensive aquaculture systems. In these systems fish is cultured next to other organisms, which are converting otherwise...
Eel migration to the Sargasso: remarkably high swimming efficiency and low energy costs (2005)
Antonissen, E., Müller, U.K., Booms, G.H.R., Eding, E.H., Verreth, J.A.J., ...
One of the mysteries of the animal kingdom is the long-distance migration (5000¿6000 km) of the European eel Anguilla anguilla L. from the coasts of Europe to its spawning grounds in the Sargasso...
Protein production by the heterotrophic bacteria using carbon supplemented fish waste (2005)
Schneider, O., Sereti, V., Eding, E.H., Verreth, J.A.J.
Reutilization of wastes is mainly focusing on dissolved substances. Non-dissolved, particulate waste is often discharged, as sludge, leaving a signiamount of nutrients un-used. Heterotrophic bacteria...
Jiménez-Montealegre, R., Verdegem, M.C.J., Verreth, J.A.J.
In aquaculture, ponds with high loads of organic inputs, organic matter accumulates at the bottom over time. Uneaten feed, senescent phytoplankton and faeces are the principal sources of accumulated...
Nitrogen budget and fluxes in Colossoma macropomum ponds (2005)
Jiménez Montealegre, R.A., Avnimelech, Y., Verreth, J.A.J., Verdegem, M.C.J.
This study quantified the accumulation of nitrogen (N) in the water column, sediments, fish and seepage water during a production cycle of Colossoma macropomum. By combining estimates of the...