DOCSLIB.ORG

John W. Davidson III______Research Scientist 1098 Turner Road Shepherdstown, WV 25443 Office: 304-870-2221 [email protected]

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
John W. Davidson III______Research Scientist 1098 Turner Road Shepherdstown, WV 25443 Office: 304-870-2221 Jdavidson@Conservationfund.Org John W. Davidson III___________________________ Research Scientist 1098 Turner Road Shepherdstown, WV 25443 Office: 304-870-2221 [email protected] Profile John Davidson is a Research Scientist at the Conservation Fund’s Freshwater Institute in Shepherdstown, West Virginia, where he has been employed for more than twenty years. John oversees aquaculture research projects, collects and analyzes biological, water quality, and engineering data, and reports the findings through peer-reviewed publications and conference presentations. John has authored numerous science-based articles focused on fish production in recirculation aquaculture systems with specific topics including: water quality, sustainable diets, salmonid product quality, off-flavor, ozone, and the effects of accumulating nitrate on salmonids, among others. Education M.S. Wildlife and Fisheries Resources, West Virginia University, 2009 B.S. Biology, Shepherd University, 1998 Career Awards Intrafish 40 Under 40 Award – 2016 – Recognizing young professionals making impacts in the aquaculture/seafood industry Aquacultural Engineering Superior Paper Awards – 2010, 2011, 2012 Recent First-Author Publications Davidson, J., Summerfelt, S., Straus, D., Good, C., 2019. Evaluating the effects of prolonged peracetic acid dosing on water quality and rainbow trout Oncorhynchus mykiss performance in recirculation aquaculture systems. Aquacult. Eng. 84, 117-127. Davidson, J., Plautz, C.Z., Grimm, C., Jørgensen, N.O.G., Podduturi, R., Raines, C., Snader, R., Summerfelt, S., Good, C., 2018. Evaluating the microbial effects of stocking freshwater snails (Physa gyrina) in water reuse systems culturing rainbow trout (Oncorhynchus mykiss). J. Appl. Aquacult. Davidson, J., Kenney, P.B., Barrows, F., Good, C., Summerfelt, S., 2018. Fillet quality and processing attributes of post-smolt Atlantic Salmon, Salmo salar, fed a fishmeal-free diet and a fishmeal-based diet in recirculation aquaculture systems. J. World Aquacult. Soc. 49(1), 183-196. Davidson, J., Good, C., Russell, C., Summerfelt, S.T., 2017. Evaluating the chronic effects of nitrate on the health and performance of post-smolt Atlantic salmon Salmo salar in freshwater recirculation aquaculture systems. Aquacult. Eng. 79, 1-8. Davidson, J., May, T., Good, C., Waldrop, T., Kenney, B., Terjesen, B.F., Summerfelt, S., 2016. Production of market-size North American strain Atlantic salmon Salmo salar in a land- based recirculation aquaculture system using freshwater. Aquacult. Eng. 74, 1-16. Davidson, J., Barrows, F.T., Kenney, P.B., Good, C., Schroyer, K., Summerfelt, S., 2016. Effects of feeding a fishmeal-free diet on post-smolt Atlantic salmon Salmo salar performance, water quality and waste production in recirculation aquaculture systems. Aquacult. Eng. 74, 38-51. Davidson, J., Summerfelt, R., Barrows, F., Gottsacker, B., Good, C., Fischer, Summerfelt, S., 2016. Walleye Sander vitreus performance, water quality, and waste production in replicated recirculation aquaculture systems when feeding a low phosphorous diet without fishmeal versus a traditional fishmeal-based diet. Aquacult. Eng. 75, 1-13. Davidson, J., Schrader, K., Ruan, E., Swift, B., Aalhus, J., Juarez, M., Wolters, W., Burr, G., Good, C., Summerfelt, S.T., 2014. Evaluation of depuration procedures to mitigate the off- flavor compounds geosmin and 2-methylisoborneol from Atlantic salmon Salmo salar raised to market-size in recirculating aquaculture systems. Aquacult. Eng. 61, 27-34. Davidson, J., Good, C., Welsh, C., Summerfelt, S., 2014. Comparing the effects of high vs. low nitrate on the health, performance, and welfare of juvenile rainbow trout Oncorhynchus mykiss within water recirculating aquaculture systems. Aquacult. Eng. 59, 30-40. Davidson, J.W., Kenney, P.B., Manor, M., Good, C.M., Weber, G.M., Aussanasuwannakul, A., Turk, P.J., Welsh, C., 2014. Growth performance, fillet quality, and reproductive maturity of rainbow trout (Oncorhynchus mykiss) cultured to 5 kg within freshwater recirculating systems. J. Aquacult. Res. Dev. 5(4), 1-9. Davidson, J., Good, C., Barrows, F.T., Welsh, C., Kenney, P.B., Summerfelt, S., 2013. Comparing the effects of feeding a grain- or a fish meal-based diet on water quality, waste production, and rainbow trout Oncorhynchus mykiss performance within low exchange water recirculating aquaculture systems. Aquacult. Eng. 52, 45-57. Davidson, J. Good, C., Welsh, C., Summerfelt, S., 2011. Abnormal swimming behavior and increased deformities in rainbow trout Oncorhynchus mykiss cultured in low exchange water recirculation aquaculture systems. Aquacult. Eng. 45, 109-117. .
Load more

Recommended publications
  • Technical and Economical Feasibility of On-Farm Fish Feed Production Using Fishmeal Analogs Kerry W
    North Central Regional Aquaculture Center North Central Regional Aquaculture Center Publications and Papers 1996 Technical and economical feasibility of on-farm fish feed production using fishmeal analogs Kerry W. Tudor Illinois State University Ronald R. Rosati United States Department of Agriculture Patrick D. O'Rourke Illinois State University Y. Victor Wu United States Department of Agriculture David Sessa United States Department of Agriculture See next page for additional authors Follow this and additional works at: http://lib.dr.iastate.edu/ncrac_pubs Part of the Agriculture Commons, Aquaculture and Fisheries Commons, and the Bioresource and Agricultural Engineering Commons Recommended Citation Tudor, Kerry W.; Rosati, Ronald R.; O'Rourke, Patrick D.; Wu, Y. Victor; Sessa, David; and Brown, Paul, "Technical and economical feasibility of on-farm fish feed production using fishmeal analogs" (1996). North Central Regional Aquaculture Center Publications and Papers. 1. http://lib.dr.iastate.edu/ncrac_pubs/1 This Article is brought to you for free and open access by the North Central Regional Aquaculture Center at Iowa State University Digital Repository. It has been accepted for inclusion in North Central Regional Aquaculture Center Publications and Papers by an authorized administrator of Iowa State University Digital Repository. For more information, please contact [email protected]. Technical and economical feasibility of on-farm fish feed production using fishmeal analogs Abstract Ten experimental diets and one control diet were fed to 720 tilapia (20 fish × 12 cages × three replicates) in a recirculating aquaculture system to determine the economic significance of replacing fishmeal with fishmeal analogs if the fishmeal analogs were processed on-site by the producer.
    [Show full text]
  • Development Shrimp Farming Pakistan
    Current status on European lobster aquaculture in Europe Report from the 3rd annual ELCE meeting held in Stavanger, Norway on 18 – 19 May 2015 Sponsored by: Report from workshop held on 18-19 May 2015 in Stavanger, Norway Address: Kjelsbergtunet 29 N-4050 Sola, Norway Telephone: +47 51 32 59 00 Fax: +47 51 32 59 01 Cellular: +47 90 19 67 31 E-mail: [email protected] Title: Serial No. Date Current status on European lobster aquaculture in Europe. 0X – 2015 25 September 2015 Report from the 3rd annual ELCE meeting held in Stavanger, Report/Document Pages: Norway 18 – 19 May 2015. No. 35 pp. Author: Geographical Topic group: Distribution: Asbjørn Drengstig, Ivar Lund, Ann- area: Lobster aquaculture Open Lisbeth Agnalt, Dom Boothroyd, Carly Europe Daniels, Knut Jørstad, Susanne Eriksen, Ragnheidur Thorarinsdottir, Roberta Cimmaruta, Gonzalo Pèrez Benavente, Jane McMinn & Beth Evensen File/Archive: Client/Employer: Europe/workshops-lobster/01-15 European Lobster Centre of Excellence Abstract: On behalf of the network European Lobster Centre of Excellence (ELCE), Norwegian Lobster Farm hosted the 3rd annual meeting. Altogether 36 participants from a total of eight countries were present during the two days workshop. The main aim of the meeting was to organise a 3rd workshop in the ELCE network. ELCE wanted to continue the positive development within the network between Nordic companies and institutions carrying out research and commercial attempts with the European lobster. Due to a strong interest from countries outside the Nordic region, several European companies and research institutions were also invited in order to highlight status on lobster aquaculture in Europe.
    [Show full text]
  • Or a Fish Meal-Based Diet on Water Quality, Waste
    Aquacultural Engineering 52 (2013) 45–57 Contents lists available at SciVerse ScienceDirect Aquacultural Engineering journa l homepage: www.elsevier.com/locate/aqua-online Comparing the effects of feeding a grain- or a fish meal-based diet on water quality, waste production, and rainbow trout Oncorhynchus mykiss performance within low exchange water recirculating aquaculture systems a a b a John Davidson , Christopher Good , Frederic T. Barrows , Carla Welsh , c a,∗ P. Brett Kenney , Steven T. Summerfelt a The Conservation Fund’s Freshwater Institute, 1098 Turner Road, Shepherdstown, WV 25443, United States b United States Department of Agriculture, Agricultural Research Service, United States c West Virginia University, Division of Animal and Nutritional Sciences, Morgantown, WV, 26506, United States a r t i c l e i n f o a b s t r a c t Article history: Feeding a fish meal-free grain-based diet (GB) was compared to feeding a fish meal-based diet (FM) Received 1 December 2011 relative to water quality criteria, waste production, water treatment process performance, and rainbow Accepted 3 August 2012 trout Oncorhynchus mykiss performance within six replicated water recirculating aquaculture systems (WRAS) operated at low exchange (0.26% of the total recycle flow; system hydraulic retention time = 6.7 Keywords: days). Rainbow trout (214 ± 3 g to begin) were fed the GB diet within three WRAS and the FM diet within Recirculating aquaculture system the other three WRAS for 3 months. Feeding the GB diet resulted in significantly greater total ammonia Alternative protein diet nitrogen (TAN) throughout the study, as well as significantly greater total suspended solids (TSS) and Sustainable Aquafeeds carbonaceous biochemical oxygen demand (BOD) over the greater part of the study.
    [Show full text]
  • Aquaculture Engineering
    AQU AQUACULTURE ENGINEERING ENGINEERING SECOND EDITION ODD-IVAR LEKANG AC Aquaculture has been expanding at a rate of 9% per year for more than 20 years, and is projected to AQUACULTURE continue growing at a very rapid rate into the foreseeable future. In this completely updated and revised new edition of a highly successful, best-selling and well-received book, Odd-Ivar Lekang provides the latest ULTURE must-have information of commercial importance to the industry, covering the principles and applications of all major facets of aquaculture engineering. ENGINEERING Every aspect of the growing field has been addressed with coverage spanning water transportation and treatment; feed and feeding systems; fish transportation and grading; cleaning and waste handling; and instrumentation and monitoring. Also included in this excellent new edition are comprehensive details of major changes to the following subject areas: removal of particles; aeration and oxygenation; recirculation and water reuse systems; ponds; and the design and construction of aquaculture facilities. Chapters providing information on how equipment is set into systems, such as land-based fish farms and cage farms, are also included, and the book concludes with a practical chapter on systematic methodology for planning S a full aquaculture facility. ECOND Fish farmers, aquaculture scientists and managers, engineers, equipment manufacturers and suppliers to the aquaculture industry will all find this book an invaluable resource. Aquaculture Engineering, Second Edition, will be an essential addition to the shelves of all libraries in universities and research establishments where aquaculture, biological sciences and engineering are studied and taught. E DITION ABOUT THE AUTHOR Odd-Ivar Lekang is Associate Professor of Aquaculture Engineering at the Department of Mathematical Sciences and Technology at the Norwegian University of Life Sciences in Ås.
    [Show full text]
  • High-Throughput Sequencing Analysis of the Microbial Community In
    Aquacultural Engineering 83 (2018) 93–102 Contents lists available at ScienceDirect Aquacultural Engineering journal homepage: www.elsevier.com/locate/aque High-throughput sequencing analysis of the microbial community in coastal intensive mariculture systems T ⁎ Jian-Hua Wanga, Jian Lua,b, , Yu-Xuan Zhanga,b, Jun Wub,c, Cui Zhanga,b, Xiaobin Yua,b, Zhenhua Zhangd, Hao Liue, Wen-Hao Wangf a Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, Shandong 264003, People’s Republic of China b University of Chinese Academy of Sciences, Beijing, 100049, People’s Republic of China c Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, Qinghai 810008, People’s Republic of China d School of Resources and Environmental Engineering, Ludong University, Yantai, Shandong 264025, People’s Republic of China e Shandong Oriental Ocean Sci-tech Co. Ltd, Yantai, Shandong 264003, People’s Republic of China f Yantai Fisheries Research Institute, Yantai, Shandong 264003, People’s Republic of China ARTICLE INFO ABSTRACT Keywords: The conventional and recirculating mariculture systems are two typical intensive mariculture systems in the High-throughput sequencing coastal zone. This study used high-throughput sequencing method to investigate the structural profiles of mi- Microbial community crobial communities in conventional and recirculating mariculture farms. The results showed that 13,842 OTUs Conventional mariculture system (operational
    [Show full text]
  • November/December 2015
    november/december 2015 January/February 2009 DEPARTMENTS From The President 2 From The Editor 3 18 Parasite Treatment Reduces Flavobacterium Columnare GAA Activities 5 Infection In Tilapia Advocacy And Advances 10 De-Hai Xu, Ph.D.; Craig Shoemaker, Ph.D.; Dunhau Zhang, Ph.D. Advocate Advertisers 80 20 Increased Density Improves Feeding Response, Growth Performance In Grouper Ingrid Lupatsch, Ph.D. On the cover: 22 Study: Inbreeding Affects Body Weight, But Not Survival In White Shrimp Responsible aquaculture provides healthy food and important employ- Dr. Lidia de los Ríos-Pérez, Dr. Gabriel R. Campos-Montes, ment opportunities around the world. The Global Aquaculture Alliance Dr. Alfonso Martínez-Ortega, Dr. Héctor Castillo Juárez, has been proud to share this news through the Global Aquaculture Advo- Dr. Hugo H. Montaldo cate magazine. Please continue to read the new Advocate online. Photo by Noppharat_th. 26 Natural Feed Additive Improves Shrimp Productivity In Ecuador Demonstration Juan Carlos Valle; Peter Coutteau, Ph.D. Page 20 28 The Bottom Line Density Ups Feeding Feed And Water Quality Revisited Response In Grouper Thomas R. Zeigler, Ph.D. Contrary to common perceptions, 32 Sustainable Aquaculture Practices grouper stocked at high density had Efficiency Of Mechanical Aeration greater feed intake and better feed Claude E. Boyd, Ph.D. conversion. 35 Biofilter Inoculation In Recirculating Aquaculture Systems Dr. Adrian A. Bischoff, Laura Koch, Marcus Thon, Prof. Dr. Bela H. Buck Page 66 37 Dietary Acidification In Aquaculture Enhanced AHPND Detection Christian Lückstädt, Ph.D. A study found that shrimp allowed to decompose prior to processing 39 Maximizing Nutrition For Adult Marine Fish reflected improved PCR detection of AHPND.
    [Show full text]
  • Shrimp Aquaculture & Olive Production - Sustainable Integration
    SHRIMP AQUACULTURE & OLIVE PRODUCTION - SUSTAINABLE INTEGRATION By Dennis McIntosh1*, Kevin Fitzsimmons1, Jose Aguilar2 and Craig Collins2 1 University of Arizona, Environmental Research Lab 2601 E. Airport Dr. Tucson, Arizona 85706 2 Wood Brothers' Farm Gila Bend, Arizona *Phone: (520) 626-3318 *Fax: (520) 573-0852 *E-mail: [email protected] Introduction The efficient utilization of resources, be it man power, fertilizer, water or even light and heat, has long been the aim of agriculture. Countless agricultural methods have been developed and perfected over the years to maximize production. Innovations such as greenhouses and genetic engineering have enabled agriculture to be successful even in areas where it might not otherwise be possible. Prior to the widespread use of commercial farming, the integration of various aspects of farm production was commonplace (Fernando and Halwart 2000). Today, as consumers and producers alike become more environmentally conscience, we are seeing a renewed interest in more efficient and better utilization of resources. By integrating aquaculture production into traditional agriculture, the impact of farming on already limited water resources (Prinsloo and Schoonbee 1993; Ingram et al. 2000) and the reliance on chemical fertilizers can be reduced (Fernando and Halwart 2000). Various methods have been proposed over the years to merge the farming of aquatic animals with field crops and/or terrestrial animals (Prinsloo and Schoonbee 1987; Ruddle and Zhong 1988; Fernando and Halwart 2000). To date, much effort has gone into small-scale (subsistence level) sustainable production of plants and animals (Lightfoot et al. 1993; Gupta et al. 1997), with one common approach being the use of agriculture wastes (manures and plant wastes for example) as a fertilizer for fish ponds, effectively converting unusable proteins into a usable commodity (Prinsloo and Schoonbee 1987; Prinsloo and Schoonbee 1993).
    [Show full text]
  • Engineering and Bio-Technologies in Aquaculture - R
    FISHERIES AND AQUACULTURE – Vol. IV – Engineering and Bio-Technologies in Aquaculture - R. Billard, L. Varadi ENGINEERING AND BIO-TECHNOLOGIES IN AQUACULTURE R. Billard Muséum National d’Histoire Naturelle, Paris, France L. Varadi Fish Culture Research Institute, Szarvas, Hungary Keywords: Aquaculture, engineering, biotechnologies, fish processing, hatcheries, environment, domestication. Contents 1. Introduction 2. Engineering Technologies 2.1 Culture of Juvenile in Hatcheries 2.2 Culture of Mollusks and Algae in Open Water 2.3 Culture in Ponds 2.4 Culture in Raceways and Tanks 2.5 Culture in Cages or Enclosures 2.6 Fish Production in Closed System 2.7 Technologies for Fish Harvesting and Fish Transportation 3. Bio-manipulation of Ecosystems 4. Bio-technologies 4.1 Bio-technologies for Artificial Reproduction (induced breeding) 4.2 Bio-technologies Used for the Control of Sex 4.3 Bio-technologies for Genetics Improvement 5. Technologies for Fish Processing and Marketing 6. Examples of Impact of Technologies on Aquaculture Development 6.1 Simple Technologies 6.2 Complex Technologies 6.3 Bio-technologies and Domestication of Species 6.4 Implementation of Technologies 6.5 Perspectives Acknowledgements Glossary BibliographyUNESCO – EOLSS Biographical Sketches SAMPLE CHAPTERS Summary A large variety of technologies are involved in production and processing in fish culture. Some are engineering technologies dealing with all physical aspect of production and mechanics; others are dealing with biology, the so-called “bio- technologies.” There is a continuum in the complexity of technologies, which is related to a continuum in the complexity of production systems and in the degree of domestication of the species and the expertise of the farmer.
    [Show full text]
  • Aquaculture Iii
    AQUACULTURE III 1. WEEk Aquaculture Science and Aquaculture Engineering WEEkLY TOPICS Week Topics 1. Week Aquaculture Science and Aquaculture Engineering 2. Week Aquaculture: Economic and Environmental 3. Week Aquaculture: Innovation and Social Transformation 4. Week Aquaculture: Food Ethics 5. Week Shellfish Aquaculture and the Environment 6. Week Advances in aquaculture hatchery technology 7. Week Recirculating Aquaculture 8. Week Selection and Breeding Programs in Aquaculture 9. Week Ecological and Genetic Implications of Aquaculture Activities 10. Week Aquaculture: Biotechnology 11. Week Aquaculture nutrition: gut health, probiotics, and prebiotics 12. Week Mucosal Health in Aquaculture 13. Week Off-Flavors in Aquaculture 14. Week Sustainable Aquaculture Techniques Aquaculture Science and Aquaculture Engineering Aquacultural engineering is a multidisciplinary field of engineering that aims to solve technical problems associated with farming aquatic vertebrates, invertebrates, and algae. Common aquaculture systems requiring optimization and engineering include sea cages, ponds, and recirculating systems. Aquaculture Science and Aquaculture Engineering Aquaculture technicians, for instance, are involved in freshwater and marine farming, hatchery management and research into farmed species. They can be involved in research, equipment design, site development, and the harvesting, processing and shipment of products. https://www.jcu.edu.au/courses-and-study/courses/master-of-science-in-aquaculture-science-and-technology Aquaculture Science and Aquaculture Engineering The aquaculture industry has made remarkable progress in many countries most especially Southeast Asia (FAO, 1997), due largely to the contributions of aquaculture engineering. Uzukwu, P. U., George, O. S., & Jamabo, N. A. (2010). Aquaculture Engineering: Status and Roles in the Growth of Aquaculture Industry in Nigeria. Current Research Journal of Biological Sciences, 2(6), 410-413.
    [Show full text]
  • Bait Shrimp Culture
    SRAC Publication No. 1201 VI April 2007 PR Bait Shrimp Culture Ryan L. Gandy1 The live bait shrimp industry in pound. This wholesale price However, live-haul trials of farm- the southeastern U.S. is dependent includes delivery from the shrimp raised, live bait shrimp showed on three shrimp species: the boat to the retail bait shop and so that commercial volumes (200 to Atlantic white shrimp (Litopenaeus it varies with the distances 500 pounds per shipment) could setiferus), the Gulf brown shrimp involved. Retailers who own their be successfully transported to (Farfantepenaeus aztecus) and the own shrimp boats may charge fish- retail bait shops with more than Gulf pink shrimp (F. duorarum). ermen as little as $7.00 per pound; 95 percent survival 24 hours after All three species occur along the in general, fishermen pay $10 to delivery. southern and eastern U.S. coasts $16 per pound for live bait shrimp from Texas through North (Fig. 1). Seed supply Carolina. The live bait shrimp The main impediment to bait industry within this extensive Live hauling bait shrimp shrimp aquaculture has been the coastal region is mostly a capture Wild-caught bait shrimp are trans- lack of consistent supplies of dis- fishery. Juvenile shrimp within a ported to market in oxygenated ease-free postlarvae (PL). Without size range of 150- to 60-count holding tanks at densities of 1 to them, both researchers and com- shrimp (3.0- to 7.5-g) are harvested 2 pounds per gallon of water. mercial aquaculturists have relied from inshore waters with trawling Mortality rates can be 25 to 50 per- on two methods of obtaining PL.
    [Show full text]
  • The Sustainability of Tilapia Aquaponics: a Case Study
    The Sustainability of Tilapia Aquaponics: A Case Study by Allie Frost A practicum submitted in partial fulfillment of the requirements for the degree of Master of Science (Natural Resources and Environment) in the University of Michigan December 2019 Practicum Committee: Assistant Professor of Practice Jose Alfaro, Chair Peter M. Wege Endowed Professor of Sustainable Systems Greg Keoleian 1 Table of Contents 1. Abstract – Page 2 2. Literature Review – Page 3 3. Methodology – Page 10 4. Results – Page 20 5. Conclusion – Page 26 6. Appendix – Page 28 7. Sources – Page 29 2 Abstract As circular economy systems gain popularity with the environmental movement, the combination of raising fish (aquaculture) and growing crops outside of soil (hydroponics) appeals to many, especially in low-resource areas. But how environmentally friendly is it really, especially when compared to other farming technologies? This study aims to measure the energy, water, and nutrient inputs of a tilapia and tomato aquaponics system over a six-month growing season and compare those numbers to plant and fish biomass outputs. Then, the data is compared to traditional tomato farming, aquaculture, and hydroponics technologies to determine which has the best input to output ratios in each category. The system output 45.1 kg of plant biomass, 91.9 kg of tomatoes, and 21.6 kg of tilapia. Aquaponics is found to consume more water and energy than traditional and hydroponic tomato growth methods. Traditional farming was found to use 31.9 L water/kg tomato and produce 19.2 gCO2e/kg tomato. Hydroponics was found to consume 17 L water/kg tomato and produce 209 gCO2e/kg tomato.
    [Show full text]
  • High Performance of Aquaponic System for Western Kenya
    High Performance of Aquaponic System for Western Kenya Introduction Fisheries and aquaculture play important roles in providing food and income in many developing countries, either as a stand-alone activity or in association with crop agriculture and livestock rearing. Attempts to come up with innovative production methods to enhance production of fish from the wild and through technology-enhanced aquaculture is widely sought. Aquaponics, the integrated culture of fish and other aquatic organisms with plants is one such technology that has been proposed. However, this technology remains largely untried in Kenya and much of Africa. Though it has a great potential to produce for Kenya and other developing countries, Aquaponics is still a young science . 70 Materials and Methods Width/Treatment: 15fish/tank Width/Treatment: 30fish/tank Width/Treatment: 45fish/tank The study was conducted at the University of Eldoret hatchery . 60 Eighteen plastic rectangular tanks of 100L each were used during this experiment. There were three aquaponic treatments each stocked 50 with Monosexed Nile tilapia fingerlings. The fish were stocked at densities of 15fingerlings/tank, 30 fish/tank and 45 fish/tank for 40 treatments 1, 2 and 3 respectively. These treatments were replicated four times. Each treatment was be subjected to a 16 lettuce density 30 per m2. Water quality was monitored and recorded using photometer 9500, Ysi DO and temperature Meter and Ysi photolab. Data from on (mm) Leaves of Width 20 fish and plant growth were collected and recorded. The water quality parameters were compared through the growth period using one way 10 Analysis of Variance (ANOVA) while the growth of the monosex O.
    [Show full text]