Physico-chemical factors of water in aquaponic production of lettuce (Lactuca sativa L.) and North African catfish (Clarias gariepinus)

master's thesis

• Title: Fizikalno kemijski čimbenici vode pri akvaponskom uzgoju salate (Lactuca sativa L.) i sjevernoafričkog soma (Clarias gariepinus)
• Author: Marija Megla
• Mentor: Daniel Matulić (mentor)
• Committee member: Daniel Matulić (predsjednik povjerenstva)
• Committee member: Tea Tomljanović (član povjerenstva)
• Committee member: Sanja Fabek Uher (član povjerenstva)
• Granter: University of Zagreb; Faculty of Agriculture; (Department of Fisheries, Beekeeping, Game Management and Special Zoology); Zagreb
• Defense date and country: 2017-07-12, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Agronomy; Fishing

Abstract

Akvaponski sustavi su integrirani multitrofični sustavi koji inkorporiraju proizvodnju biljaka bez uporabe tla. Primarni cilj akvaponskog sustava je iskoristiti nutrijente iz akvakulturnog uzgoja u uzgoju biljaka. Cilj istraživanja je bio utvrditi fizikalno-kemijske čimbenike vode akvaponskog sustava te usporediti s vrijednostima otopine u hidroponskom sustavu. Akvaponski sustav je obuhvatio deset uzgojnih tankova s jedinkama sjevoernoafričkog soma (Clarias gariepinus) povezanih s dva bazena u kojima se uzgajala salata (Lactuca sativa L.). Kontrolnu varijantu u istraživanju predstavljao je plutajući hidropon u kojem se koristila standardna hranjiva otopina za uzgoj lisnatog povrća. Rezultati istraživanja ukazuju na nepovoljne i nestabilne koncentracije kisika, nitrita i pH vrijednosti u akvaponskom sustavu što su ograničavajući faktori u uspješnom održavanju takve vrste sustava. Pojava patogena i nakupljanje mulja u akvaponskim bazenima ukazali su na lošu sterilizaciju hranjive otopine. Prema rezultatima istraživanja, hidroponski sustav pokazao se kao uspješniji u uzgoju salate.

Abstract (english)

Aquaponic systems are integrated multitrophic systems that incorporate plant production without soil. The main goal of an aquaponic system is using the nutrients from the aquaculture system for plant production. The goal of this research was to determine water parameters in the aquaponic system and compare them to the values from the hydroponic system. The aquaponic system was consisted of ten growing tanks with African catfish (Clarias gariepinus) connected to two pools with lettuce (Lactuca sativa L.). For the control variant in the experiment, a floating hydroponic system with a standard nutrient solution was used. Results showed unfavorable and unstable levels of oxygen, nitrites, and pH values which were the limiting factor in the successful maintenance of the aquaponic system. The presence of pathogens and sludge accumulation in aquaponic systems were the indicator of bad sterilization of the nutrient solution. According to the results of the research, the hydroponic system proved to be a better option for growing lettuce.

• Keywords: Fizikalno-kemijski parametri; akvaponski sustav; sjevernoafrički som; salata; pH; kisik; nitriti
• Keywords (english): Physico-chemical water parameters; aquaponic system; African catfish; lettuce; pH; oxygen; nitrites
• Language: croatian
• URN:NBN: urn:nbn:hr:204:704039
• Study programme: Title: Ribarstvo i lovstvo; Study programme type: sveučilišni; Study level: diplomski; Academic / professional title: magistar/ magistra inženjer/inženjerka ribarstva i lovstva (magistar/ magistra inženjer/inženjerka ribarstva i lovstva)
• Type of resource: text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2017-07-25 12:52:43