Rast riječnih rakova u različitim uvjetima uzgoja tijekom treće godine života

master's thesis

• Title (english): Growth of the noble crayfish in different aquaculture conditions during third year of life
• Author: Ivan Rubelj
• Mentor: Goran Klobučar (mentor)
• Mentor: Andreja Lucić (pomoć pri izradi, neposredni voditelj)
• Committee member: Goran Klobučar (član povjerenstva)
• Committee member: Željka Vidaković Cifrek (član povjerenstva)
• Committee member: Domagoj Đikić (član povjerenstva)
• Committee member: Ivana Maguire (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2015, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Akvakultura predstavlja uzgoj i prirod biljaka i životinja u svim oblicima vodenih okoliša. Ona uključuje kontrolu reprodukcije i rasta, te eliminaciju uzroka prirodnog mortaliteta. U ovom istraživanju korištene su različite kombinacije temperature, gustoće juvenilnih jedinki i vrste hrane kako bi se utvrdilo koji su od tih parametara i u kojoj kombinaciji najpovoljniji za rast juvenilnih rakova vrste Astacus astacus u njihovoj trećoj godini života. Tijekom razdoblja od pet mjeseci (od svibnja do listopada 2014. g.) prikupljani su podaci o masi, duljini i spolu jedinki te temperaturi vode. Uz to su na kraju istraživanog razdoblja utvrđeni fiziološki parametri uvjetovani zadanim tretmanima, a u tu svrhu su primijenjeni hepatosomatski i mišićni indeksi kondicije. Utvrđeno je da je najveći prirast u ukupnoj masi tijela (134,07%) postignut u tretmanu: plastenik (viša temperatura), hrana životinjskog podrijetla, manja gustoća jedinki (21 jedinke/m2), a najveći prirast u duljini tijela (27,87%) postignut je u tretmanu: plastenik (viša temperatura), hrana životinjskog podrijetla, veća gustoća jedinki (42 jedinke/m2). Također, ustanovljene su statistički značajne razlike među tretmanima u kondicijskim indeksima juvenilnih jedinki, a pokazalo se da su za njihov energetski status najznačajniji čimbenici temperatura i hrana.

Abstract (english)

Aquaculture represents breeding and harvesting of plants and animals in all types of water environments. It includes the control of reproduction and growth and the elimination of the causes of natural mortality. In this study different combinations of temperature, density of juvenile specimens and type of food were used to determine which parameters and in which combination were most favourable for the growth of juvenile crayfish Astacus astacus in their third year of life. During period of five months (between May and October 2014), data on weight, length and sex of individuals were collected, as well as water temperature data. In addition, at the end of the research period physiological parameters which were dependent on aquaculture treatments were identified and for this purpose hepatosomatic and muscle indexes have been applied. It was found that the largest increase in the total body mass (134,07%) was achieved in the next treatment: greenhouse (higher temperature), meat diet, lower density (21 specimens/m2) and largest increase in total length (27,87%) was achieved in the next treatment: greenhouse (higher temperature), meat diet, higher density (42 specimens/m2). Also, some statistically significant differences in condition indexes between treatments were found. It turned out that food and temperature were the most significant factors that affected energy status of juvenile specimens.

• Keywords: riječni rak; Astacus astacus; prirast mase; prirast duljine; indeksi kondicije; hepatosomatski indeks; mišićni indeks
• Keywords (english): noble crayfish; Astacus astacus; juvenile crayfish growth; condition indexes; hepatosomatic indexes; muscle indexes
• Language: croatian
• URN:NBN: urn:nbn:hr:217:898915
• Study programme: Title: Molecular Biology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra molekularne biologije (magistar/magistra molekularne biologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2018-05-18 09:45:20