MSc. Koushik Roy, Ph.D.

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Dr. Koushik Roy is a circular and sustainable aquaculture system biologist. He is a fish nutritionist, biologist, and aquatic ecologist by training. In Central European Pond farming, he is developing supplementary feeding concepts 1-4 that can upcycle local circular resources in an efficient or carbon-neutral manner to produce nutritious food from the ponds. In harmony with the natural food web. Also, with a special emphasis on improving farmed pond fish biomass use efficiency from farm-to-fork 5 and ecological engineering of fishponds 6. His skillset includes the following:

  • Aquaculture systems (Ponds, Aquaponics, RAS, Biofloc).
  • Systems thinking in aquaculture (production, footprint, post-harvest, human nutrition and dietetics, ecosystem services, in-vivo-in-situ nutrient flows).
  • Circular bioeconomy framework in aquaculture (valorisation and value addition of biomass, waste streams, resource use efficiency at animal, ecosystem, and food chain scale).
  • Aquaculture-environment interactions (mass balance emissions from feeding/ farm, life cycle assessment, climate change effects).
  • Bioenergetics (digestibility, faecal and metabolic losses, retention of C/N/P/energy) and nutrient flows (reactive, particulate N/P losses, trophic fractionation of amino acids, biological upgradation of fatty acids).
  • Nutritional ecology of pond systems (ecological stoichiometry, plankton ecology group model, enzymes from food web).
  • Farm-to-fork aspects (finishing feeding, pre-slaughtering/ slaughtering/ post-slaughtering, management, fish processing by-products upcycling, sensory evaluation).

Koushik is presently employed at the Faculty of Fisheries and Protection of Waters, University of South Bohemia in Ceske Budejovice as Assistant professor (from 01.01.2024) and scientific worker (since 01.04.2022). His education and research started in West Bengal (India) where 'fish for food security' and 'resource circularity for economic reasons' have historical roots. His masters thesis started with investigating differences in urban and peri-urban ponds in Central India 8, which coincidentally lead to pond-centric work in PhD thesis too 9. During 2015-2018, Koushik obtained first-hand research experience on inland capture fisheries and vulnerabilities from the effects of climate change. During 2018-2022, the researcher as part of his doctoral research had worked on several themes, but the primary focus was on "circular and sustainable fish nutrition" 9. Additionally to ponds, the researcher also engaged to understand and integrate nutrient flows in multitrophic systems 9-10 and nutrition of alternative aquatic animal species 11-12, besides carp 13.

Koushik’s work on European fishponds have also percolated to the policymakers of EU 14, 15. Koushik has received an order of merit for all his BSc, MFSc, and PhD degrees, including a Dean’s award for best research paper under age 35 for his post-doc tenure. He has 39 web of science-indexed publications, and WoS h-index reaching 17 within his 7 years of publication experience. He is involved as junior editorial board member in the Reviews in Aquaculture (Wiley). He supervises PhD (n=1) and masters (n=1) or co-supervise PhD (n=3) thesis. He teaches fish nutrition for PhD or MSc students under English program in faculty. Koushik is holding responsibility as deputy of head of laboratory of nutrition (fish nutrition and ponds working group). He has been PI of two university project grants (1 year each, 8134 EUR each) and helped with successful obtainment of two national level grants (3 year or 5 year) in his capacity as lead researcher (not PI): one focuses on basic research related to nutritional bioenergetics of fish in pond systems (GAČR Mráz 22-18597S) and one on applied research related to development of circular and eco-efficient pond fish nutrition technology (NAZV Mráz QK22010177). He also serves as panel member of natural sciences board for his university grant agency.

With Prof. Johan A.J. Verreth (Prof. emeritus, WUR AFI), year 2022 onwards, Koushik has worked increasingly towards circular food system dimensions 16-17. With Dr. Marc C.J. Verdegem, a pioneer in global pond research, Koushik organized Marc’s sabbatical stay in his laboratory, only to be trained by Marc on nutritious pond concept developed at WUR-AFI, ecological stoichiometry, nutrient recycling in ponds, etc. Koushik also unified his own “balanced nutrition concept” for Central European fishponds with Marc’s “nutritious pond concept”, for example 18, which later ignited cooperation for multiple HORIZON consortiums.



  1. Roy, K., Vrba, J., Kaushik, S.J. and Mraz, J., 2020. Nutrient footprint and ecosystem services of carp production in European fishponds in contrast to EU crop and livestock sectors. Journal of Cleaner Production270, p.122268.
  2. Roy, K., Vrba, J., Kajgrova, L. and Mraz, J., 2022. The concept of balanced fish nutrition in temperate European fishponds to tackle eutrophication. Journal of Cleaner Production, 364, p.132584.
  3. Roy, K., Másílko, J., Kajgrova, L., Kuebutornye, F.K.A., Oberle, M. and Mraz, J., 2023a. End-of-season supplementary feeding in European carp ponds with appropriate plant protein and carbohydrate combinations to ecologically boost productivity: lupine, rapeseed and, triticale. Aquaculture577, p.739906.
  4. Roy, K., Dvorak, P., Machova, Z. and Mraz, J., 2023b. Nutrient footprint versus EPA+ DHA security in land-locked regions—more of local pond farmed, imported marine fish or fish oil capsules?. npj Science of Food7(1), p.48.
  5. Mraz, J., Jia, H. and Roy, K., 2023. Biomass losses and circularity along local farm‐to‐fork: a review of industrial efforts with locally farmed freshwater fish in land‐locked Central Europe.Reviews in Aquaculture15(3), pp.1083-1099.
  6. Kajgrová, L., Pecha, O., Roy, K., Dvořák, J., Let, M., Potužák, J., Vrba, J. and Bláha, M., 2024. Pond cascades as a tool for ecological aquaculture allowing natural zooplankton succession, nutrient retention, and multiple stocking–harvesting cycles. Aquacultural Engineering104, p.102374.
  7. Roy, K., 2014. Studies On The Nutrient Dynamics, Plankton Diversity And Primary Productivity Of A Perennial Unmanaged Urban And Peri-urban Pond In Raipur District Of Chhattisgarh, India.
  8. Roy, K., 2022. Circular and sustainable fish nutrition. Doctoral thesis. University of South Bohemia in Ceske Budejovice, Faculty of Fisheries and Protection of Waters, Czech Republic. 213 pp. ISBN 978-80-7514-149-1.
  9. Lunda, R., Roy, K., Másílko, J. and Mráz, J., 2019. Understanding nutrient throughput of operational RAS farm effluents to support semi-commercial aquaponics: Easy upgrade possible beyond controversies. Journal of environmental management245, pp.255-263.
  10. Roy, K., Kajgrova, L. and Mraz, J., 2022. TILAFeed: A bio-based inventory for circular nutrients management and achieving bioeconomy in future aquaponics. New Biotechnology, 70, pp.9-18.
  11. Roy, K., Podhorec, P., Dvorak, P. and Mraz, J., 2021. Understanding Nutrition and Metabolism of Threatened, Data-Poor Rheophilic Fishes in Context of Riverine Stocking Success-Barbel as a Model for Major European Drainages?. Biology, 10(12), p.1245.
  12. Lunda, R., Roy, K., Dvorak, P., Kouba, A. and Mraz, J., 2020. Recycling biofloc waste as novel protein source for crayfish with special reference to crayfish nutritional standards and growth trajectory. Scientific Reports, 10(1), p.19607.
  13. Roy, K., Vrba, J., Kaushik, S.J. and Mraz, J., 2020. Feed‐based common carp farming and eutrophication: is there a reason for concern?. Reviews in Aquaculture, 12(3), pp.1736-1758.
  14. Aquaculture Advisory Council, European commission. 2021.
  15. European commission, Brussels.
  16. Roy, K., Turkmen, S. and Turchini, G.M., 2021. Triggering circularity in aquaculture–an introductory virtual special issue. Rev Aquac
  17. Verreth, J.A., Roy, K. and Turchini, G.M., 2023. Circular bio‐economy in aquaculture.Reviews in Aquaculture15(3), pp.944-946.
  18. BioRural Webinar. 2023.

Aktuální rozvrh



Curriculum Vitae



Name:                                     Koushik

Surname:                                Roy

Title:                                        Ph.D.

Born:                                       22nd November 1989, Haripal

Hooghly, India

Nationality:                            Indian

Languages:                             English (FCE Level C1), Hindi, Bengali.

Contact:                                  Tato e-mailová adresa je chráněna před spamboty. Pro její zobrazení musíte mít povolen Javascript.

Marital status:                       Married (Dr. Deepali Rahi Roy, Postdoc USB FFPW)



2018–2022          Ph.D. (Fishery) “with one summa-cum-laude from reviewer”, Faculty of Fisheries and Protection of Waters, University of South Bohemia, Ceske Budejovice, Czech Republic.

2011–2014          M.F.Sc. (Aquaculture) “with distinction”, Department of Aquaculture, Indira Gandhi Agricultural University, Raipur, Chhattisgarh, India.

2008–2011          B.Sc. (Industrial Fish and Fisheries) “with distinction”, Department of Industrial Fish and Fisheries, Asutosh College, University of Calcutta, West Bengal, India.

2014                    Qualified Indian Council of Agricultural Research (ICAR) National Eligibility Test (NET) in Aquaculture. Eligible for nationwide university lecturership.



2014–2015          Guest faculty (teaching), Department of Industrial Aquaculture and Fisheries, Asutosh College, University of Calcutta.

2015-2018           Senior Research Fellow, Project NICRA (climate change, inland fishes, and fisheries), ICAR-Central Inland Fisheries Research Institute (Government of India), Barrackpore, West Bengal, India.

2022- 2024          Postdoctoral research scientist. Laboratory of nutrition, Faculty of Fisheries and Protection of Waters, University of South Bohemia in Ceske Budejovice.

2024- present     Assistant Professor (academic and scientific worker). Laboratory of nutrition, Faculty of Fisheries and Protection of Waters, University of South Bohemia in Ceske Budejovice.



2011                    University order of merit, First rank holder, University of Calcutta.

2014                    University order of merit in M.F.Sc., First rank holder, Indira Gandhi Agricultural University.

2019-2021           Best presentation awards in FROV PhD seminars (3 years, 3 seminars).

2021                    FROV Dean’s best publication award.

2020-2021           Recipient of two one-year grants (GAJU projects) by university grant agency.

2022                    Best PhD thesis (position 2) at national level competition “Science for Earth 2022” by Narodni Zemedelske Muzeum, Praha.

2023                    Dean’s best publication award in postdoc. Among age category under 35.



2018                         Dr. Francis Murray, Institute of Aquaculture, University of Stirling.

2018                         Dr. Salin Krishna, Asian Institute of Technology, Thailand.

2018-2020                Prof. Sadasivam Kaushik, University of Las Palamas Gran Canaria, Spain.

2018-2020                Dr. Uttam Kumar Sarkar, Central Inland Fisheries Research Institute, India

2019                         Prof. Werner Kloas, IGB, Berlin, Germany.

2019-2021                Dr. Martin Oberle, Lfl-Bayern, Bavaria, Germany.

2020-2021                Prof. Giovanni Turchini, Deakin University, Australia.

2021                         Dr. Serhat Turkmen, University of Birmingham, USA.

2021                         Assoc. prof. Stefanie Colombo, Dalhousie University, Canada.

2020-2021                Prof. Johan Verreth, Wageningen University and Research, Netherlands

2021-2022                Dr. Joel Aubin, INRAE France

2022-2023                Prof. Marc Verdegem, Wageningen University and Research, Netherlands (submitted MSCA PF 2023-2024 project)


Sciento-metrics (as of 01.01.2024)

  • Total number of publications (Scopus): 40
  • Total number of citations (without self-citations): 407
  • Total number of citations (overall): 494
  • h-Index (without self-citations): 13
  • h-Index (overall): 15
  • m-Quotient: 2.5
  • Field-Weighted Citation Impact (FWCI): 1.12
  • Documents in Q1 journals: 62.1%
  • Verified peer reviews (WoS collection): 35
  • Editorship: Reviews in Aquaculture (RAQ).
  • Project as PI: 2 GAJUs
  • Project assisted and successful: 2 (GAČR Mráz 22-18597S, NAZV Mráz QK22010177).
  • Applied output: 3 (2 methodology, 1 verified technology)


Web of Science ID

Scopus ID


Google Scholar

Pedago-metrics (at USB FFPW)

  • Thesis consultants: 4 (1 bachelor finished, 3 doctoral undergoing)
  • Main supervisor of thesis: 1 (masters), 1 (PhD)
  • Teaching: 2 courses (Fish Nutrition for MSc or PhD)



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