Marc C.J. Verdegem

Marc C.J. Verdegem
Wageningen University & Research | WUR · Faculty of Animal Sciences

PhD

About

345
Publications
91,713
Reads
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8,138
Citations
Additional affiliations
January 1988 - February 2016
Wageningen University & Research
Position
  • Professor (Assistant)
September 1987 - December 2015
Wageningen University & Research
Position
  • Professor (Assistant)
Description
  • De Elst 1 (Building 122) www.afi.wur.nl

Publications

Publications (345)
Article
Full-text available
Mangrove forests are remarkably diverse and productive ecosystems, with distinctive biophysical environments in intertidal coastal regions of the tropics and subtropics. In these regions, shrimp cultivation is identified as a profitable business and one of the main reasons for clearing of mangroves to construct shrimp farms. Against this backdrop a...
Article
Full-text available
The growth, tissue content and nutrient removal rates of Ulva spp., when exposed to moderate to high nitrogen (0.5–5 mmol L ⁻¹ ) and phosphorus (0.01–0.9 mmol L ⁻¹ ) concentrations, were examined to get a better understanding of recirculating IMTA (Integrated Multi-Trophic Aquaculture) systems with fish and seaweed. It was hypothesized that fish wa...
Article
Full-text available
Color, texture and flavor are all important determinants of seafood product quality and value. For shrimp, Penaeus monodon, one of the highest-priced shrimp species of the South-East Asia shrimp industry, dark tiger-striped coloration is a key product quality criterion. We evaluated the effects of leaf litter of the mangrove species Avicennia offic...
Article
The effects of dietary bile acid supplementation (BAS) on apparent digestibility coefficients (ADC) and the bile acid metabolism in rainbow trout (Oncorhynchus mykiss) were investigated for diets differing in non-starch polysaccharide (NSP) level. Four experimental diets were formulated according to an 2 by 2 factorial design. A low-NSP and High-NS...
Article
Full-text available
Sustainable aquaculture requires the efficient use of natural pond resources as well as supplements to meet the dietary requirements of fish species. However, aquaculture diets are often produced without considering the lysine content of the natural production in the pond. As such, two plant-based diets, a control diet (L-Con) supplemented with 5.0...
Article
Full-text available
Abstract Color, texture and flavor are all important determinants of seafood product quality and value. For shrimp, Penaeus monodon, one of the highest-priced shrimp species of the South-East Asia shrimp industry, dark tiger-striped coloration is a key product quality criterion. We evaluated the effects of leaf litter of the mangrove species Avicen...
Presentation
Full-text available
A circular economy (CE) is perceived as a way to reduce the environmental pressure of human activities including (blue)food production. In general, CE and its principles are still underexplored in aquaculture, although its fundamentals (i.e., the reuse, recycling, recovering nutrients, and energy) have already been largely applied. A recent study p...
Article
Full-text available
White spot syndrome virus (WSSV), the etiological agent of white spot disease (WSD), is a significant pathogen affecting shrimp farming industry worldwide. White spot syndrome virus is a generalist virus mainly infecting decapod crustaceans. The aims of this review were to: (1) Re‐evaluate and update the status of reported WSSV host and vector spec...
Conference Paper
Full-text available
The conference aims to bring together PhD-candidates, staff, and researchers from different fields within Animal Sciences to promote and present their research while encouraging interdisciplinary collaboration across the field of animal sciences. The theme for this year's conference is: Resilience. It goes without being said that 2020-2021 has been...
Article
Full-text available
Mangrove leaf litter is a potential source of nutrients for shrimp post larvae. To introduce mangrove trees in shrimp farms it is necessary to identify the combination of trees which is most beneficial for shrimp. The present study evaluated the effects of mixed leaf litter of four mangrove species (Avicennia officinalis (Ao), Sonneratia apetala (S...
Article
Full-text available
One of the bottlenecks for commercial implementation of integrated multi-trophic aquaculture (IMTA) is the difficulty in quantifying its environmental performance. We reviewed a large body of literature to determine the variability in nutrient dynamics within different IMTA systems (open sea-cages, land-based flow-through and recirculating aquacult...
Article
Full-text available
Background Fish gut microbial colonisation starts during larval stage and plays an important role in host’s growth and health. To what extent first colonisation could influence the gut microbiome succession and growth in later life remains unknown. In this study, Nile tilapia embryos were incubated in two different environments, a flow-through syst...
Article
Full-text available
Two diets were formulated, a low lysine (LowL) and a balanced lysine diet (BalL), containing 9.10 and 13.10 g lysine kg −1 feed, respectively. Twenty fish (30.2 ± 1.9 g) per tank were stocked in 110-L tanks, mounted in a recycling aquaculture system (RAS), and nine hundred fish (17.2 ± 1.6 g) per pond were stocked in 200 m 2 fertilized ponds (FPS)....
Article
Full-text available
FLOCponics is an alternative type of aquaponics that integrates biofloc technology (BFT) with soilless plant production. The aims of this paper are to present a detailed overview of the FLOCponics system's designs and performance, discuss their sustainability, highlight the current challenges, and give directions for future research. Data sources i...
Article
Full-text available
The establishment of the early-life gut microbiota plays an important role in fish development and influences the health status and growth performance of the host. The effect of different rearing conditions can have an impact on the initial colonization of the gut microbiota, while addition of probiotics may also affect such colonization. However,...
Article
Full-text available
Shrimp based mangrove-aquaculture (silvo-aquaculture) is practiced in many countries of the world and leaf litter of different mangrove tree species is a potential nutrient source in these systems. The present study evaluated the effects of mangrove leaf litter from four mangrove species (Sonneratia apetala, S. caseolaris, Avicennia officinalis and...
Article
Full-text available
The release of nutrients and anti-nutrients from mangrove leaf litter plays an important role in the biogeochemical cycling in aquatic environments and directly or indirectly affects water quality and food availability to shrimp. In this study, we assessed nutrient and anti-nutrient loss during decomposition of leaf litter at a concentration of 1 g...
Article
Full-text available
The addition of external carbohydrate in Pacific white shrimp (Litopenaeus vannamei) culture has shown positive effects on water quality and shrimp performance. However, this practice requires additional skills and labor, and therefore may not be widely adopted. This research investigated the potential to combine the carbon source and the feed in o...
Article
Full-text available
Sustainable aquafeed production requires fishmeal replacement, leading to an increasing use of plant-derived ingredients. As a consequence, higher levels of antinutritional substances, such as non-starch polysaccharides and phytate, are present in aquafeeds, with negative effects on fish performance, nutrient digestibility and overall gut health. T...
Article
Full-text available
Effects of the type of dietary non‐protein energy source on the size and composition of the total body bile acid pool, on faecal bile acid loss and on bile acid synthesis were investigated in rainbow trout. Two diets were formulated (similar DP:DE ratio) that differed in the inclusion of either maize starch (Starch) or rapeseed oil (Fat) as main no...
Article
Full-text available
The increased use of plant ingredients in aquafeeds over the last decades, as replacement for fish meal, has led to rising levels of undesired non-starch polysaccharides (NSP) and phytate. Both NSP and phytate degrading enzymes and probiotics have been widely studied. They can be used as a tool to deal with increasing levels of NSP and phytate in a...
Article
Full-text available
The main effects and synergy between three enzymes (phytase, xylanase and β-glucanase) on growth performance and nutrient digestibility was explored in Nile tilapia (Oreochromis niloticus). This was done according to a 2 × 2 × 2 factorial arrangement, resulting in 8 dietary treatments. In total 24 tanks (3 replicates per treatment) were used with 3...
Article
Full-text available
Using capture fishery‐derived fish oil and fishmeal in aquafeeds is unsustainable. This study mimicked semi‐intensive shrimp ponds, including primary producers, in mesocosm tanks. Fatty acid mass balances were computed to distinguish between diet‐based and primary production‐based LC‐PUFA contributions to shrimp (Litopenaeus vannamei) production an...
Article
In Pacific white shrimp culture, adding organic carbohydrate to the pond besides feed improves water quality and shrimp performance. While the feeding frequency has significant effects on shrimp production, how often carbohydrate should be added remains unknown. This research investigated the effects of carbohydrate addition frequency of 1, 3, and...
Article
Full-text available
Time‐related changes in apparent digestibility coefficients (ADC) and faecal bile acid loss as affected by dietary fat level and non‐starch polysaccharide (NSP) level were studied in rainbow trout (Oncorhynchus mykiss). Low‐Fat versus High‐Fat and Low‐NSP versus High‐NSP diets were formulated. Fish were fed for 6 weeks to apparent satiation and fae...
Article
Full-text available
The contribution of aquaculture to the total greenhouse gas (GHG) emission from agriculture is small. However, it is a major concern as aquaculture is one of the fastest growing agricultural activities. Life cycle analysis (LCA) indicates that formulated feed is the major contributor to GHG emission from aquaculture. Depending on the boundaries set...
Article
Full-text available
This review investigates the performance and the feasibility of the integration of an algal reactor in recirculating aquaculture systems (RAS). The number of studies related to this topic is limited, despite the apparent benefit of algae that can assimilate part of the inorganic waste in RAS. We identified two major challenges related to algal inte...
Article
Development of benthic components within integrated multi-trophic aquaculture (IMTA) systems warrants more attention, and the development of polychaetes as an extractive component in IMTA systems is ongoing. This study estimates the bioremediation potential of Capitella sp. and Ophryotrocha craigsmithi for coupled and decoupled salmon-driven IMTA....
Article
Full-text available
In biofloc technology carbohydrate is added to stimulate the biofloc growth, the latter helps to improve water quality, reduce the need for water exchange and may serve as natural shrimp feed. The large diversity among possible carbohydrate sources makes the selection of a suitable carbohydrate difficult. This study investigated how corn starch add...
Article
Full-text available
The use of plant by-products in aqua-feeds contributes to improving the sustainability of aquaculture, but also leads to increased levels of undesirable non-starch polysaccharides (NSP) and phytate. NSP-degrading enzymes (i.e. xylanase) and phytase can be used as a tool to deal with NSP and phytate. A feeding trial was conducted to test whether the...
Article
Full-text available
Dietary non-starch polysaccharides (NSP) changes the nutrient digestibility and faecal characteristics in fish. This study assessed the effect of the type of dietary NSPs on fish production and the contribution of natural food to the total fish production in semi-intensively managed tilapia ponds. Twelve ponds, each divided into three equally-sized...
Article
Full-text available
This study tested the effect of two diets differing in carbohydrate to lipid (CHO:LIP) ratio (4.7 vs. 19.5 g/g) on the contribution of natural food and the total fish production in tilapia ponds. Eight ponds, each divided into three equally sized compartments, were assigned to one of the two diets, which differed in CHO:LIP ratio but had the same d...
Article
Full-text available
This study investigated in rainbow trout (Oncorhynchus mykiss) if dietary bile acid supplementation is effective in restoring hampered fat digestibility related to conditions that enhance fecal bile acid loss (i.e., high dietary non-starch polysaccharide (NSP) level and high feeding level). Four diets were formulated according to a two-by-two facto...
Article
Full-text available
Currently, studies reporting the digestibility of carbohydrates, starch and especially non-starch polysaccharides (NSP) in fish are scarce. Carbohydrate digestibility in the diet is largely dependent upon carbohydrate composition (starch vs. NSP). NSP are often considered to be indigestible and thus of no nutritional value. The present study review...
Article
Full-text available
Global climate change threatens to lead to further sequences of drought in the already arid and semi-arid regions of the world and threatens the well-being and livelihoods of hundreds of millions of people living in these regions. We cannot heal global climate change within the near future but we can and should use all possible means to minimize th...
Article
Full-text available
This study investigated in rainbow trout (Oncorhynchus mykiss) if diet composition and feeding level affect faecal bile acid loss, and whether this reflects on the apparent digestibility coefficient (ADC) of fat. Six diets were formulated with either fishmeal or plant protein as main protein source. This created a contrast in the supply of bile aci...
Article
Inorganic‑nitrogen removal is essential for the sustainable operation of aquaculture industry and also influences the health of aquatic animals, which may be accomplished by utilizing biofloc technology. In this paper, we studied the use of three different carbon sources 1) longan seed powder (LP), 2) Poly(β-hydroxybutyrate-β-hydroxyvalerate) (PHBV...
Article
Full-text available
Capitella sp. and Ophryotrocha craigsmithi received a diet of salmon feces to evaluate their potential to convert fish waste into valuable marine products, e.g. ingredients for fish feed formulation. Production rate and body composition (focusing on fatty acid [FA] profiles) were determined for polychaetes fed fresh, acid-preserved or oven-dried sa...
Article
Full-text available
The nutritious pond concept is a novel approach that enables the pond itself to contribute significantly to the diet of the farmed fish/shrimp. Our research shows that feeding the pond by balancing the carbon-to-nitrogen ratio can increase the contribution of naturally occurring food in the diets of the cultured animals, thus enhancing reliance and...
Article
Full-text available
The experiment investigated whether the effect of enzyme supplementation on performance and nutrient digestibility is dependent on type of the ingredient(s) used, by incorporating wheat bran (WB), sunflower meal (SFM) and citrus pulp (CP) to a reference diet (REF). Those ingredients are known to be rich in different types of non‐starch polysacchari...
Chapter
Cultured and wild bivalve stocks provide ecosystem services through regulation of nutrient dynamics; both by regeneration of nutrients that become available again for phytoplankton production (positive feedback), and by extraction of nutrients through filtration and storage in tissue (negative feedback). Consequently, bivalves may fulfil a role in...
Article
Monoculture is an inefficient aquaculture system because on average <~20% of the diet supplied is assimilated by the target species. Integrated aquaculture systems are attractive alternatives because they take advantage of the wasted nutrients to produce other marketable species. Substrate addition is known as beneficial management to promote natur...
Article
When fish have only access to formulated feed, the optimal dietary protein to energy ratio (P:E) for tilapia ranges between 18 and 23 g.MJ−1. In pond culture, where natural foods complement administrated feed, increasing the carbon:nitrogen (C:N) ratio stimulates the natural food productivity. This study assessed if lowering the dietary P:E ratio (...
Article
Full-text available
Recirculating aquaculture systems (RAS) are becoming important for aquaculture due to land and water supply limitations and due to their low environmental impact. Bacteria are important in RAS as their role in nutrient recycling has been the main mechanism for waste removal in these systems. Besides bacteria, the presence of microalgae can benefit...
Article
Full-text available
The availability of high-quality juveniles is a bottleneck in the farming of many marine fish species. Detrimental larvae-microbe interactions are a main reason for poor viability and quality in larval rearing. In this review, we explore the microbial community of fish larvae from an ecological and eco-physiological perspective, with the aim to dev...
Article
Full-text available
We evaluated the effect of low pH and low and high total ammonia nitrogen (TAN) concentrations on the physiology, stress status and the growth performance of turbot in RAS. Two experiments were conducted. In Experiment 1, turbot (466 g) were grown at control (pH 7.5; TAN ~0.5 mg/L) or low pH and high TAN (pH 5.7; TAN ~50 mg/L) for 55 days. In Exper...
Article
Full-text available
The experimental set-up of this study mimicked recirculating aquaculture systems (RAS) where water quality parameters such as dissolved oxygen, pH, temperature, and turbidity were controlled and wastes produced by fish and feeding were converted to inorganic forms. A key process in the RAS was the conversion of ammonia to nitrite and nitrite to nit...
Data
Water quality data (min, max, mean, and standard deviation). (PDF)
Data
Three way repeated measure analysis of variance of total ammonia nitrogen (TAN), nitrite (NO2-N), and nitrate (NO3-N) concentration (mg L-1) in recirculating aquaculture systems. The results compare between factors algae (with algae (+A) and without algae (-A)), location (fish, algae and nitrification), stressor (with stressor (+S) and without stre...
Data
Repeated measure analysis of variance of apparent total ammonia nitrogen (TAN) conversion rate (mg L-1 day-1) and apparent nitrite (NO2-N) conversion rate (mg L-1 day-1) in recirculating aquaculture systems. The results compare between factors algae (with algae (+A) and without algae (-A)), and stressor (with stressor (+S) and without stressor (-S)...
Data
pH changes in recirculating aquaculture system (RAS) with algae (+A) and without algae (-A). (TIF)
Data
Curves based on Chao1 (richness analysis) at a sequencing depth of 315930. Samples are labeled with factors “algae”- with algae (+A), without algae (-A); “location”- fish (Lf), algae (La) and bio-filter (Lb) tanks; “day”- a day before stress (d-1), 20 days after stress (d20) and “stressor”- stressed (+S) and not stressed (-S). (TIF)
Data
Microbiota differences based on operational taxonomy units (OTU) and cluster of orthologous genes (COG). (PDF)
Data
Percentages of predicted sequences by cluster of orthologous genes (COG). Samples are labeled with factors “algae”- with algae (+A), without algae (-A); “location”- fish (Lf), algae (La) and bio-filter (Lb) tanks; and stressor- stressed (+S) and not stressed (-S). (TIF)
Data
Operational taxonomy unit (OTU) dissimilarity of bacterial community between stressed (+S) and non-stressed (-S) recirculating aquaculture system (RAS). The graph shows the top 10% OTU which contributed to the total dissimilarity as given by SIMPER analysis. A number of percentage (%) written next to the identity of OTU denoted the % of contributio...
Data
Relative abundance of nitrifying bacteria. Bacteria which were able to perform autotrophic nitrification (Nitrosomonadaceae, Nitrospira) or heterotrophic nitrification and denitrification (Rhodococcus, Chryseobacterium, Bacillus, Acinetobacter, and Pseudomonas) identified in the recirculating aquaculture systems with (+A) and without algae (-A) a d...
Data
Percentage (%) of daily water replacement from recirculating aquaculture system on days after pH drop was applied. (TIF)
Article
Increasing the inclusion rate of plant ingredients will increase the content of non-starch polysaccharides (NSP) and phytate in the fish feed. Both NSP and phytate are undesired in fish feed due to their anti-nutritional properties. The main objective of the present study was to assess the impact of exogenous enzyme supplementation on growth, body...
Article
Full-text available
To assess the potential for improving sustainability and efficiency in an important Vietnamese finfish culture, we quantified sustainability indicators for 2 downstream and 2 upstream 3 to 4 m deep ponds for striped catfish Pangasianodon hypophthalmus (Sauvage, 1878) production along the Mekong River, Vietnam. The resources used per kg fish produce...
Article
Full-text available
Incorporation of microalgae in recirculating aquaculture systems (RAS) would absorb the inorganic nitrogen and phosphorus, thus potentially contributing to water purification. Immobilization or entrapment of microalgae cells in spherical gels could be a method to incorporate microalgae in the RAS. Filamentous microalgae are presumed to suit the imm...