Dr Daniel Merrifield

Dr Daniel Merrifield

Associate Professor of Fish Health and Nutrition

School of Biological and Marine Sciences (Faculty of Science and Engineering)


Research and teaching


PhD -  Evaluation of selected probiotics and bovine lactoferrin asfeed supplements for rainbow trout (Oncorhynchus mykiss Walbaum) forapplications in aquaculture. Plymouth University

Postgraduate Certificate in Academic Practice (PGCAP), Plymouth University

PgCert (distinction) -Research Methods, Plymouth University 

General Teachers Associates training course, Plymouth University

BSc (Hons; 2:1) - BiologicalSciences, Plymouth University

Professional membership

World Aquaculture Society

Society for Applied Microbiology

World Aquaculture Society Publication Committee

Fellow of the Higher Education Academy (FHEA)

Environment, Food and Biotechnology Research Group

Roles on external bodies

Editorial and referee commitments

·        Associate Editor for the Journal of the World Aquaculture Society (2015-present)

·        Memberof the Editorial board for

·   Editor-in-Chief for the Journal of Aquaculture Research and Development (2010-2014)

·   Chief Editor of the Fisheries andAquaculture Journal (2011-2013)

·   Chief Editor for special issue onprobiotics and prebiotics in aquaculture, Journal ofAquaculture Research and Development (2011)

·   Panel member for the Agricultural and Veterinary Sciences Panel of the Stimulus ofScientific Employment, Individual Support - 2017 Call. The Portuguese Foundation for Science and Technology(FCT)

·        TheNational Agency for the Evaluation of Universities and Research Institutes (ANVUR),Italy; eValuation of Quality of Research (VQR)2004-2010 and 2011-2014

·        Referee for the followingscientific research bodies:

-      The Biotechnology andBiological Sciences Research Council (BBSRC),UK

-      The United States Department of Agriculture(USDA)

-      The French National ResearchAgency (Agence Nationale de laRecherche; ANR)

-      The Portuguese Foundation for Scienceand Technology (FCT)

-      The Netherlands Organisation forScientific Research (NWO)

-      The Israel Science Foundation (ISF)

-      The Polish National Science Centre (NCN)

-      Superior Council of the National Fundfor Scientific & Technological Development (FONDECYT), Chile

-      National Research Foundation (NRF), South Africa

-      The National Science Centre (NCN), Poland

-      Wageningen Institute of Animal Science (WIAS),Netherlands

-      IdEx Bordeaux Post-doctoral program,University of Bordeaux

-      Universidad de la Sabana PhD proposal

-      Policy documents for the UKGovernment Office for Science (GO Science)

-      Western Regional Aquaculture Center (WRAC),USA

-      Czech Science Foundation (GACR)

-      The Royal Society 


Teaching interests

Gut health and microecology

Aquatic microbiology 


Probiotics and prebiotics


Programme Leader:

MSc(PgDip) Sustainable Aquaculture

Module leader: 

BIOL120 Cell Biology and Microbiology

BIO5208 Contemporary Issues in Aquaculture

BIO504 Health and Production in Aquaculture

Teaching on modules:
BIO504: Health and Production in Aquaculture
BIO505: Research Project
BIO5125: Sustainable Use of Resources in Biological Systems
BIOL119: Introduction to Biology
BIOL120: Cell Biology and Microbiology
BIOL121: Animal Physiology and Microbiology
BIOL123: Field Biology
BIOL126: Animal Behaviour Field Biology
MBIO322: Marine Microbiology - Ecology and Applications 
BIOL5129: Health and Production in Aquaculture

BIO5131: Postgraduate Research Skills & Methods 


MSc(PgDip) Sustainable Aquaculture Systems

BSc(Hons) Biological Sciences

BSc(Hons) Animal Behaviour and Welfare

BSc(Hons) Marine Biology

Research interests

Feed additives

Gut health

Alternative protein sources

Probiotics and Prebiotics

Research degrees awarded to supervised students


Research group:

Dr Gabriella Do Vale Pereir- Post-Doctoral Research Associate

Dr Mark Rawling - Post-Doctoral Research Associate

RungtawanYomla - PhD student; Development of autochthonous probiotics for applicationsfor tilapia 

Kurt Servin - PhD student; The use of yeast-derived feed additives to support in shrimp health and production (part-time, overseas)

Nicola Pontefract – PhD student; Feed additive strategies to improve mucosal defenses in fish

Lucy Sykes - MPhil student; The application of GOS in aquafeeds

Grants & contracts

Funding generated: >£1,300,000 (RCUK = £450,000, other FEC contractualprojects = >£380,000, studentships = >£475,000, other = > £13,500)

Recent examples (PI = PrincipleInvestigator; Co-I = Co-investigator; DoS = Director of Studies):


Contractual work, Coppens, 2017 (PI)


Commercial contract - Lallemand, Norway (PI), 2018


Commercial contract - Skretting, Norway (PI), 2018


Commercial contract - Lallemand, Norway (PI), 2018

Total £433,000 (PU £130,000)

Innovate UK project (application ref 84746-536289) Low Cost, High Quality, Algal Biomass for Aquaculture Feed, 2017-2019 (Academic PI)


MPhil studentship, Clasado Biosciences, 2017-2019 (Lucy Sykes) (DoS)


Contractual work, Coppens, 2017 (PI)


Commercial contract - Skretting, Norway (PI), 2017


Commercial contract - Skretting, Norway (PI), 2017


Contractual work, Coppens, 2017 (PI)


Contractual work, Coppens, 2017 (PI)


Contractual work, INTA, 2017 (PI)


BBSRC project (BB/N024028/1) Mucosal health and microbiota during sea lice parasitism: effect of oral delivery of immunomodulants, 2016-2018 (PI)


Commercial contract - Skretting, Norway (PI), 2016-2017


Contractual work, INTA, 2016 (PI)


Contractual work, Lallemand SAS, 2016 (PI)


Contractual work, INTA, 2016 (PI)


50% PhD studentship, Lallemand SAS, 2016-2019 (DoS)


Contractual work, Lallemand SAS, 2016 (PI)


Contractual work, BioMar, 2016 (PI)

PU: £50,000 (Total £250,000)

BBSRC-NERC project (BB/M026604/1): Gut health and immune function: the emerging role of gut microbiota in sustainable aquaculture, 2015-2017 


Research groups

  • Food, Nutrition and Health

Key publications are highlighted

Jaramillo-Torres A, Rawling MD, Rodiles A, Mikalsen HE, Johansen L-H, Tinsley J, Forberg T, Aasum E, Castex M & Merrifield DL 2019 'Influence of Dietary Supplementation of Probiotic Pediococcus acidilactici MA18/5M During the Transition From Freshwater to Seawater on Intestinal Health and Microbiota of Atlantic Salmon (Salmo salar L.)' Frontiers in Microbiologyy 10, , DOI PEARL
Al-Hisnawi A, Rodiles A, Rawling MD, Castex M, Waines P, Gioacchini G, Carnevali O & Merrifield DL 2019 'Dietary probiotic Pediococcus acidilactici MA18/5M modulates the intestinal microbiota and stimulates intestinal immunity in rainbow trout ( Oncorhynchus mykiss )' Journal of the World Aquaculture Society 50, (6) 1133-1151 , DOI
Vale Pereira G, Pereira SA, Soares A, Mouriño JLP & Merrifield D 2019 'Autochthonous probiotic bacteria modulate intestinal microbiota of Pirarucu, Arapaima gigas' Journal of the World Aquaculture Society 50, (6) 1152-1167 , DOI
Serra CR, Almeida EM, Guerreiro I, Santos R, Merrifield DL, Tavares F, Oliva-Teles A & Enes P 2019 'Selection of carbohydrate-active probiotics from the gut of carnivorous fish fed plant-based diets' Scientific Reports 9, (1) , DOI
Rawling MD, Pontefract N, Rodiles A, Anagnostara I, Leclercq E, Schiavone M, Castex M & Merrifield DL 2019 'The effect of feeding a novel multistrain yeast fraction on European seabass (Dicentrachus labrax) intestinal health and growth performance' Journal of the World Aquaculture Society , DOI PEARL
Falcinelli S, Rodiles A, Hatef A, Picchietti S, Cossignani L, Merrifield DL, Unniappan S & Carnevali O 2018 'Influence of Probiotics Administration on Gut Microbiota Core' Journal of Clinical Gastroenterology 52, 1-1 , DOI
Gioacchini G, Ciani E, Pessina A, Cecchini C, Silvi S, Rodiles A, Merrifield DL, Olivotto I & Carnevali O 2018 'Correction to: Effects of Lactogen 13, a New Probiotic Preparation, on Gut Microbiota and Endocrine Signals Controlling Growth and Appetite of Oreochromis niloticus Juveniles' Microbial Ecology 76, (4) 1075-1075 , DOI
do Vale Pereira G, da Cunha DG, Pedreira Mourino JL, Rodiles A, Jaramillo-Torres A & Merrifield DL 2017 'Characterization of microbiota in Arapaima gigas intestine and isolation of potential probiotic bacteria' Journal of Applied Microbiology , DOI
Falcinelli S, Rodiles A, Hatef A, Picchietti S, Cossignani L, Merrifield DL, Unniappan S & Carnevali O 2017 'Dietary lipid content reorganizes gut microbiota and probiotic L. rhamnosus attenuates obesity and enhances catabolic hormonal milieu in zebrafish' Scientific Reports 7, (1) , DOI PEARL
Gajardo K, Jaramillo-Torres A, Kortner TM, Merrifield DL, Tinsley J, Bakke AM & Krogdahl Å 2016 'Alternative protein sources in the diet modulate microbiota and functionality in the distal intestine of Atlantic salmon ( Salmo salar )' Applied and Environmental Microbiology AEM.02615-16-AEM.02615-16 , DOI PEARL
Torrecillas S, Mompel D, Caballero MJ, Montero D, Merrifield D, Rodiles A, Robaina L, Zamorano MJ, Karalazos V & Kaushik S 2016 'Effect of fishmeal and fish oil replacement by vegetable meals and oils on gut health of European sea bass (Dicentrarchus labrax)' Aquaculture 468, 386-398 , DOI
Garjardo K, Kortner, TM, Krogdahl Å, Bakke AM, Merrifield DL & Henning S 2016 'A high-resolution map of the gut microbiota in Atlantic salmon (Salmo salar): A basis for comparative gut microbial research' Scientific Reports , DOI PEARL
Merrifield 2016 'Combined effects of exogenous enzymes and probiotic on Nile tilapia (Oreochromis niloticus) growth, intestinal morphology and microbiome' Aquaculture PEARL
Adeoye AA, Jaramillo-Torres A, Fox SW, Merrifield DL & Davies SJ 2016 'Supplementation of formulated diets for tilapia (Oreochromis niloticus) with selected exogenous enzymes: Overall performance and effects on intestinal histology and microbiota' Animal Feed Science and Technology 215, 133-143 Publisher Site , DOI PEARL
Standen BT, Peggs DL, Rawling MD, Foey A, Davies SJ, Santos GA & Merrifield DL 2016 'Dietary administration of a commercial mixed-species probiotic improves growth performance and modulates the intestinal immunity of tilapia, Oreochromis niloticus' Fish & Shellfish Immunology 49, 427-435 , DOI PEARL
Apper E, Weissman D, Respondek F, Guyonvarch A, Baron F, Boisot P, Rodiles A & Merrifield DL 2016 'Hydrolysed wheat gluten as part of a diet based on animal and plant proteins supports good growth performance of Asian seabass (Lates calcarifer), without impairing intestinal morphology or microbiota' Aquaculture 453, 40-48 , DOI
Falcinelli S, Rodiles A, Unniappan S, Picchietti S, Gioacchini G, Merrifield DL & Carnevali O 2016 'Probiotic treatment reduces appetite and glucose level in the zebrafish model' Scientific Reports 6, (1) , DOI PEARL
Hoseinifar SH, Mirvaghefi A, Amoozegar MA, Merrifield DL & Ringø E 2015 'In vitroselection of a synbiotic andin vivoevaluation on intestinal microbiota, performance and physiological response of rainbow trout (Oncorhynchus mykiss) fingerlings' Aquaculture Nutrition 23, (1) 111-118 , DOI
Ringo E, Zhou Z, Vecino JLG, Wadsworth S, Romero J, Krogdahl A, Olsen RE, Dimitroglou A, Foey A & Davies S 2015 'Effect of dietary components on the gut microbiota ofaquatic animals. A never-ending story?' AQUACULTURE NUTRITION 22, (2) 219-282 Author Site , DOI PEARL
Standen BT, Rodiles A, Peggs DL, Davies SJ, Santos GA & Merrifield DL 2015 'Modulation of the intestinal microbiota and morphology of tilapia, Oreochromis niloticus, following the application of a multi-species probiotic' Applied Microbiology and Biotechnology 99, (20) 8403-8417 , DOI PEARL
Falcinelli S, Picchietti S, Rodiles A, Cossignani L, Merrifield DL, Taddei AR, Maradonna F, Olivotto I, Gioacchini G & Carnevali O 2015 'Lactobacillus rhamnosus lowers zebrafish lipid content by changing gut microbiota and host transcription of genes involved in lipid metabolism' Sci Rep 5, Author Site , DOI PEARL
Guerreiro I, Enes P, Rodiles A, Merrifield D & Oliva-Teles A 2015 'Effects of rearing temperature and dietary short-chain fructooligosaccharides supplementation on allochthonous gut microbiota, digestive enzymes activities and intestine health of turbot ( Scophthalmus maximus L.) juveniles' Aquaculture Nutrition 22, (3) 631-642 , DOI
Pedrotti FS, Davies S, Merrifield DL, Marques MRF, Fraga APM, Mouriño JLP & Fracalossi DM 2015 'The autochthonous microbiota of the freshwater omnivores jundiá (Rhamdia quelen) and tilapia (Oreochromis niloticus) and the effect of dietary carbohydrates' Aquaculture Research 46, (2) 472-481 , DOI
Güroy B, Mantoglu S, Merrifield DL & Guroy D 2014 'Effects of dietaryNutrafito Pluson growth, haemotological parameters and total ammonia-nitrogen excretion of juvenile striped catfishPangasianodon hypophthalmus' Aquaculture Research 47, (6) 1770-1777 , DOI
Guerreiro I, Enes P, Merrifield D, Davies S & Oliva-Teles A 2014 'Effects of short-chain fructooligosaccharides on growth performance and hepatic intermediary metabolism in turbot (Scophthalmus maximus) reared at winter and summer temperatures' Aquaculture Nutrition 21, (4) 433-443 , DOI
Al-Hisnawi A, Ringø E, Davies SJ, Waines P, Bradley G & Merrifield DL 2014 'First report on the autochthonous gut microbiota of brown trout (Salmo truttaLinnaeus)' Aquaculture Research 46, (12) 2962-2971 , DOI
Kühlwein H, Merrifield DL, Rawling MD, Foey AD & Davies SJ 2014 'Effects of dietary β-(1,3)(1,6)-D-glucan supplementation on growth performance, intestinal morphology and haemato-immunological profile of mirror carp (Cyprinus carpioL.)' Journal of Animal Physiology and Animal Nutrition 98, (2) 279-289 , DOI PEARL
Gioacchini G, Giorgini E, Olivotto I, Maradonna F, Merrifield DL & Carnevali O 2014 'The Influence of Probiotics on Zebrafish Danio Rerio Innate Immunity and Hepatic Stress' ZEBRAFISH 11, (2) 98-106 Author Site , DOI
Rawling MD, Merrifield DL, Kuehlwein H, Snellgrove D, Gioacchini G, Carnevali O & Davies SJ 2014 'Dietary modulation of immune response and related gene expression profiles in mirror carp (Cyprinus carpio) using selected exotic feed ingredients' AQUACULTURE 418, 177-184 Author Site , DOI
Abid A, Davies SJ, Waines P, Emery M, Castex M, Gioacchini G, Carnevali O, Bickerdike R, Romero J & Merrifield DL 2013 'Dietary synbiotic application modulates Atlantic salmon (Salmo salar) intestinal microbial communities and intestinal immunity' Fish Shellfish Immunol 35, (6) 1948-1956 Author Site , DOI
Daniels CL, Merrifield DL, Ringo E & Davies SJ 2013 'Probiotic, prebiotic and synbiotic applications for the improvement of larval European lobster (Homarus gammarus) culture' AQUACULTURE 416, 396-406 Author Site , DOI
Kühlwein H, Emery MJ, Rawling MD, Harper GM, Merrifield DL & Davies SJ 2013 'Effects of a dietary β-(1,3)(1,6)-D-glucan supplementation on intestinal microbial communities and intestinal ultrastructure of mirror carp (Cyprinus carpioL.)' Journal of Applied Microbiology 115, (5) 1091-1106 , DOI
Standen BT, Rawling MD, Davies SJ, Castex M, Foey A, Gioacchini G, Carnevali O & Merrifield DL 2013 'Probiotic Pediococcus acidilactici modulates both localised intestinal- and peripheral-immunity in tilapia (Oreochromis niloticus)' Fish Shellfish Immunol 35, (4) 1097-1104 Author Site , DOI PEARL
Guroy B, Ergun S, Merrifield DL & Guroy D 2013 'Effect of autoclaved Ulva meal on growth performance, nutrient utilization and fatty acid profile of rainbow trout, Oncorhynchus mykiss' AQUACULTURE INTERNATIONAL 21, (3) 605-615 Author Site , DOI
Güroy B, Sahin I, Kayali S, Mantoglu S, Canan B, Merrifield DL, Davies SJ & Güroy D 2013 'Evaluation of feed utilization and growth performance of juvenile striped catfishPangasianodon hypophthalmusfed diets with varying inclusion levels of corn gluten meal' Aquaculture Nutrition 19, (3) 258-266 , DOI
Soltani M, Pourkazemi M, Ahmadi MR, Taherimirghead A, Merrifield DL & Masouleh AS 2013 'Genetic diversity of lactic acid bacteria in the intestine of Persian sturgeon fingerlings' JOURNAL OF APPLIED ICHTHYOLOGY 29, (3) 494-498 Author Site , DOI
Askarian F, Sperstad S, Merrifield DL, Ray AK & Ringø E 2013 'The effect of different feeding regimes on enzyme activities of gut microbiota in Atlantic cod (Gadus morhuaL.)' Aquaculture Research 44, (5) 841-846 , DOI
Merrifield DL, Shaw BJ, Harper GM, Saoud IP, Davies SJ, Handy RD & Henry TB 2013 'Ingestion of metal-nanoparticle contaminated food disrupts endogenous microbiota in zebrafish (Danio rerio)' Environ Pollut 174, 157-163 Author Site , DOI
Güroy D, Sahin I, Güroy B, Merrifield DL, Bulut M & Tekinay AA 2013 'Replacement of fishmeal with rice protein concentrate in practical diets for European sea bassDicentrarchus labraxreared at winter temperatures' Aquaculture Research 44, (3) 462-471 , DOI
Guroy D, Guroy B, Merrifield DL, Tekinay AA, Davies SJ & Sahin I 2012 'Effects of fish oil and partial fish meal substitution with oilseed oils and meals on growth performance, nutrient utilization and health of the rainbow trout Oncorhynchus mykiss' AQUACULTURE INTERNATIONAL 20, (3) 481-497 Author Site , DOI
Rawling MD, Merrifield DL, Snellgrove DL, Kühlwein H, Adams A & Davies SJ 2012 'Haemato-immunological and growth response of mirror carp (Cyprinus carpio) fed a tropical earthworm meal in experimental diets' Fish Shellfish Immunol 32, (6) 1002-1007 Author Site , DOI
Gioacchini G, Giorgini E, Merrifield DL, Hardiman G, Borini A, Vaccari L & Carnevali O 2012 'Probiotics Can Induce Follicle Maturational Competence: The Danio rerioCase1' Biology of Reproduction 86, (3) , DOI
Omar SS, Merrifield DL, Kuehlwein H, Williams PEV & Davies SJ 2012 'Biofuel derived yeast protein concentrate (YPC) as a novel feed ingredient in carp diets' AQUACULTURE 330, 54-62 Author Site , DOI
Soleimani N, Hoseinifar SH, Merrifield DL, Barati M & Abadi ZH 2012 'Dietary supplementation of fructooligosaccharide (FOS) improves the innate immune response, stress resistance, digestive enzyme activities and growth performance of Caspian roach (Rutilus rutilus) fry' FISH & SHELLFISH IMMUNOLOGY 32, (2) 316-321 Author Site , DOI
Guroy D, Sahin I, Guroy B, Altin A & Merrifield DL 2012 'Effect of Dietary Protein Level on Growth Performance and Nitrogen Excretion of the Yellow Tail Cichlid, Pseudotropheus acei' ISRAELI JOURNAL OF AQUACULTURE-BAMIDGEH 64, Author Site
Hoseinifar SH, Mirvaghefi A, Amiri BM, Rostami HK & Merrifield DL 2011 'The effects of oligofructose on growth performance, survival and autochthonous intestinal microbiota of beluga (Huso huso) juveniles' AQUACULTURE NUTRITION 17, (5) 498-504 Author Site , DOI
Perez-Sanchez T, Luis Balcazar J, Merrifield DL, Carnevali O, Gioacchini G, de Blas I & Ruiz-Zarzuela I 2011 'Expression of immune-related genes in rainbow trout (Oncorhynchus mykiss) induced by probiotic bacteria during Lactococcus garvieae infection' FISH & SHELLFISH IMMUNOLOGY 31, (2) 196-201 Author Site , DOI
Pérez-Sánchez T, Balcázar JL, García Y, Halaihel N, Vendrell D, de Blas I, Merrifield DL & Ruiz-Zarzuela I 2011 'Identification and characterization of lactic acid bacteria isolated from rainbow trout, Oncorhynchus mykiss (Walbaum), with inhibitory activity against Lactococcus garvieae' J Fish Dis 34, (7) 499-507 Author Site , DOI
Hoseinifar SH, Mirvaghefi A & Merrifield DL 2011 'The effects of dietary inactive brewer's yeast Saccharomyces cerevisiae var. ellipsoideus on the growth, physiological responses and gut microbiota of juvenile beluga (Huso huso)' AQUACULTURE 318, (1-2) 90-94 Author Site , DOI
Güroy D, Güroy B, Merrifield DL, Ergün S, Tekinay AA & Yigit M 2011 'Effect of dietary Ulva and Spirulina on weight loss and body composition of rainbow trout, Oncorhynchus mykiss (Walbaum), during a starvation period' J Anim Physiol Anim Nutr (Berl) 95, (3) 320-327 Author Site , DOI
Merrifield DL, Harper GM, Mustafa S, Carnevali O, Picchietti S & Davies SJ 2011 'Effect of dietary alginic acid on juvenile tilapia (Oreochromis niloticus) intestinal microbial balance, intestinal histology and growth performance' Cell Tissue Res 344, (1) 135-146 Author Site , DOI
Hoseinifar SH, Mirvaghefi A, Merrifield DL, Amiri BM, Yelghi S & Bastami KD 2011 'The study of some haematological and serum biochemical parameters of juvenile beluga (Huso huso) fed oligofructose' FISH PHYSIOLOGY AND BIOCHEMISTRY 37, (1) 91-96 Author Site , DOI
Merrifield DL, Bradley G, Harper GM, Baker RTM, Munn CB & Davies SJ 2011 'Assessment of the effects of vegetative and lyophilized Pediococcus acidilactici on growth, feed utilization, intestinal colonization and health parameters of rainbow trout (Oncorhynchus mykiss Walbaum)' AQUACULTURE NUTRITION 17, (1) 73-79 Author Site , DOI
Harper GM, Monfort M, Saoud IP, Emery M, Mustafa S, Rawling M, Enyon B, Davies SJ & Merrifield DL 2011 'An ex vivo approach to studying the interactions of Pediococcus acidilactici and Vibrio (Listonella) anguillarum in the anterior intestine of rainbow trout Oncorhynchus mykiss' Aquaculture research and development , DOI
Francesco Lombardo GG 2011 'Effects of Probiotic on Zebrafish Reproduction' Journal of Aquaculture Research & Development s1, , DOI
2011 'Evaluation of Prebiotic and Probiotic Effects on the Intestinal Gut Microbiota and Histology of Atlantic salmon (Salmo salar L.)' Journal of Aquaculture Research & Development s1, , DOI
Dimitroglou A, Merrifield DL, Carnevali O, Picchietti S, Avella M, Daniels C, Güroy D & Davies SJ 2011 'Microbial manipulations to improve fish health and production--a Mediterranean perspective' Fish Shellfish Immunol 30, (1) 1-16 Author Site , DOI
Zhigang Zhou DM 2011 'Probiotic and Prebiotic Applications in Aquaculture' Journal of Aquaculture Research & Development s1, , DOI
Merrifield DL, Dimitroglou A, Bradley G, Baker RTM & Davies SJ 2010 'Probiotic applications for rainbow trout (Oncorhynchus mykiss Walbaum) I. Effects on growth performance, feed utilization, intestinal microbiota and related health criteria' AQUACULTURE NUTRITION 16, (5) 504-510 Author Site , DOI
Merrifield DL, Bradley G, Baker RTM & Davies SJ 2010 'Probiotic applications for rainbow trout (Oncorhynchus mykiss Walbaum) II. Effects on growth performance, feed utilization, intestinal microbiota and related health criteria postantibiotic treatment' AQUACULTURE NUTRITION 16, (5) 496-503 Author Site , DOI
Ferguson RMW, Merrifield DL, Harper GM, Rawling MD, Mustafa S, Picchietti S, Balcázar JL & Davies SJ 2010 'The effect of Pediococcus acidilactici on the gut microbiota and immune status of on-growing red tilapia (Oreochromis niloticus)' J Appl Microbiol 109, (3) 851-862 Author Site , DOI
Hoseinifar SH, Zare P & Merrifield DL 2010 'The effects of inulin on growth factors and survival of the Indian white shrimp larvae and postlarvae (Fenneropenaeus indicus)' AQUACULTURE RESEARCH 41, (9) e348-e352 Author Site , DOI
Daniels CL, Merrifield DL, Boothroyd DP, Davies SJ, Factor JR & Arnold KE 2010 'Effect of dietary Bacillus spp. and mannan oligosaccharides (MOS) on European lobster (Homarus gammarus L.) larvae growth performance, gut morphology and gut microbiota' AQUACULTURE 304, (1-4) 49-57 Author Site , DOI
Merrifield DL, Dimitroglou A, Foey A, Davies SJ, Baker RTM, Bogwald J, Castex M & Ringo E 2010 'The current status and future focus of probiotic and prebiotic applications for salmonids' AQUACULTURE 302, (1-2) 1-18 Author Site , DOI
Merrifield DL, Guroy D, Guroy B, Emery MJ, Llewellyn CA, Skill S & Davies SJ 2010 'Assessment of Chlorogloeopsis as a novel microbial dietary supplement for red tilapia (Oreochromis niloticus)' AQUACULTURE 299, (1-4) 128-133 Author Site , DOI
Dimitroglou A, Merrifield DL, Spring P, Sweetman J, Moate R & Davies SJ 2010 'Effects of mannan oligosaccharide (MOS) supplementation on growth performance, feed utilisation, intestinal histology and gut microbiota of gilthead sea bream (Sparus aurata)' AQUACULTURE 300, (1-4) 182-188 Author Site , DOI
Dimitroglou A, Merrifield DL, Moate R, Davies SJ, Spring P, Sweetman J & Bradley G 2009 'Dietary mannan oligosaccharide supplementation modulates intestinal microbial ecology and improves gut morphology of rainbow trout, Oncorhynchus mykiss (Walbaum)' J Anim Sci 87, (10) 3226-3234 Author Site , DOI
Merrifield DL, Harper GM, Dimitroglou A, Ringo E & Davies SJ 2009 'Possible influence of probiotic adhesion to intestinal mucosa on the activity and morphology of rainbow trout (Oncorhynchus mykiss) enterocytes' AQUACULTURE RESEARCH 41, (8) 1268-1272 Author Site , DOI
Rawling MD, Merrifield DL & Davies SJ 2009 'Preliminary assessment of dietary supplementation of Sangrovit® on red tilapia (Oreochromis niloticus) growth performance and health' Aquaculture 294, (1-2) 118-122 , DOI
Merrifield DL, Dimitroglou A, Bradley G, Baker RTM & Davies SJ 2009 'Soybean meal alters autochthonous microbial populations, microvilli morphology and compromises intestinal enterocyte integrity of rainbow trout,Oncorhynchus mykiss(Walbaum)' Journal of Fish Diseases 32, (9) 755-766 , DOI
Ergün S, Soyutürk M, Güroy B, Güroy D & Merrifield D 2009 'Influence of Ulva meal on growth, feed utilization, and body composition of juvenile Nile tilapia (Oreochromis niloticus) at two levels of dietary lipid' Aquaculture International 17, (4) 355-361 , DOI
Merrifield DL, Burnard D, Bradley G, Davies SJ & Baker RTM 2009 'Microbial community diversity associated with the intestinal mucosa of farmed rainbow trout (Oncoryhnchus mykissWalbaum)' Aquaculture Research 40, (9) 1064-1072 , DOI
Merrifield DL & Ringo E 2014 Aquaculture Nutrition Gut Health, Probiotics and Prebiotics. Wiley-Blackwell
Rodiles A, Rawling MD, Peggs DL, do Vale Pereira G, Voller S, Yomla R, Standen BT, Bowyer P & Merrifield DL 2017 'Probiotic Applications for Finfish Aquaculture' Probiotics and Prebiotics in Animal Health and Food Safety Springer International Publishing 197-217 , DOI
Merrifield DL & Rodiles A 2015 'The fish microbiome and its interactions with mucosal tissues' Mucosal Health in Aquaculture, 1st Edition Academic Press
Merrifield DL, Olsen RE, Myklebust R & Ringo E 2011 'Dietary Effect of Soybean (Glycine max) Products on Gut Histology and Microbiota of Fish' Soybean and Nutrition Rijeka, Croatia InTech 231-250 Publisher Site