The effect of feed frequency on the growth of North-African catfish Clarias gariepinus (Burchell,1822) in aquaponic production of lettuce

master's thesis

• Title: Utjecaj frekvencije hranjenja na rast sjevernoafričkog soma Clarias gariepinus (Burchell, 1822) pri akvaponskom uzgoju salate
• Author: Lana Schmidt
• 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: 2018-07-04, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Agronomy

Abstract

Cilj rada je bio utvrditi postoji li razlika u rastu mlađi C. gariepinus pri učestalosti hranjenja tri puta i pet puta dnevno jednakom ukupnom dnevnom količinom hrane pri akvaponskom uzgoju salate. Bazen br. 10 je pokazao najbolje performanse rasta u odnosu na ostale bazene, ali prema ukupnim rezultatima, povećanje frekvencije hranjenja nije pozitivno utjecalo na performanse rasta. Specifična stopa rasta pri frekvenciji hranjenja 3 puta dnevno je iznosila 5.62±1.94, a pri frekvenciji 5 puta dnevno 1.51±3.42. Omjer konverzije hrane (FCR) je također pokazao značajan pad u vrijednostima. Nepovoljni kemijski parametri vode (zasićenje kisikom od 46,66%, veliki raspon pH vrijednosti (5.36 - 7.99), koncentracija NH4+ od 1.7 mg l-1) su vjerojatno utjecali na reduciran rast riba.

Abstract (english)

The aim of this paper was to determine the effect of feed frequency on the growth of C. gariepinus juveniles in aquaponic production of lettuce. Feed frequency was 3x and 5x per day with equal daily amount of feed. Tank no. 10 showed the best growth performance compared to other tanks, but according to overall results the increase in feeding frequency did not have a positive impact on the growth. The specific growth rate at feeding frequency 3 times a day was 5.62 ± 1.94 and at a frequency of 5 times a day 1.51 ± 3.42. It also showed a significant decrease in food conversion ratio (FCR). Negative chemical parameters of water (46.66% oxygen saturation, wide range of pH values (5.36 - 7.99), NH4+ 1.7 mg l-1) probably affected reduced fish growth.

• Keywords: Clarias gariepinus; frekvencija hranjenja; akvaponski sustav
• Keywords (english): Clarias gariepinus; feeding frequency; aquaponics
• Language: croatian
• URN:NBN: urn:nbn:hr:204:727141
• 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: Restricted access
• Created on: 2018-07-23 12:15:26