Mogućnost uključivanja inovativnih tehnoloških rješenja u svrhu povećanja brojnosti populacije morske mačke iz porodice Scyliorhinidae

master's thesis

• Title (english): Potential of including innovative technological solutions in order to increase the population of the catsharks from the family Scyliorhinidae
• Author: August Bence
• Mentor: Ana Gavrilović (mentor)
• Committee member: Ana Gavrilović (predsjednik povjerenstva)
• Committee member: Tea Tomljanović (član povjerenstva)
• Committee member: Marina Piria (član povjerenstva)
• Granter: University of Zagreb; Faculty of Agriculture; (Department of Fisheries, Beekeeping, Game Management and Special Zoology); Zagreb
• Defense date and country: 2021-09-29, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Agronomy

Abstract

U posljednje vrijeme se sve više naglašava negativni učinak ribolova na brojnost ribljih vrsta iz skupine hrskavičnjača, gdje spadaju i morske mačke iz porodice Scyliorhinidae. Cilj ovog rada bio je pored istraživanja kvantitativne zastupljenosti dvije najzastupljenije vrste u prilovu hrvatskih ribara (mačka blijedica, Scyliorhinus canicula, i mačka mrkulja, Scyliorhinus stellaris), istražiti i mogućnosti njihove zaštite s obzirom na specifičnost embrionalnog razvitka koji se odvija u jajčanim vrećicama koje je moguće izvaditi s vitalnim embrijem iz mrtvih riba mačaka nakon ulova. U tu svrhu je pored opisa svih faza embrionalnog razvitka istražena i inkubacija embrija u dva različita dizajna recikulacijskog sustava (bez kontrole temperature i pri konstantnoj temperaturi od 17,5˚C) te u ambijentalnom moru na različitim dubinama i pri različitim temperaturama. Za inkubaciju u ambijentalnom moru je izrađen inovativni uređaj vlastitog dizajna, čija je efikasnost također ispitana. Rezultati su pokazali da se embriji morske mačke uspješno razvijaju na temperaturi do 24˚C te da je inovativni uređaj u potpunosti efikasan za inkubaciju jedinki mačke blijedice, S. canicula.

Abstract (english)

Recently, the negative effect of fishing on the abundance of cartilage fish species, which includes catsharks from the family Scyliorhinidae, has been increasingly emphasized. The aim of this study was to investigate the quantitative representation of the two most common species in the by-catch of Croatian fishermen (small-spotted catshark, Scyliorhinus canicula, and lesser spotted dogfish, Scyliorhinus stellaris) and to investigate the possibilities of their protection given the specificity of embryonic development that takes place in egg sacs which can be removed from dead cat fish after capture, together with a vital embryo. For this purpose, in addition to describing all phases of embryonic development, embryo incubation was investigated in two different designs of the recycling system (without temperature control and at a constant temperature of 17.5˚C) and in the ambient sea at different depths and at different temperatures. An innovative device of its own design was developed for incubation in the ambient sea, the efficiency of which was also tested. The results showed that catshark embryos successfully develop at temperatures up to 24˚C, and that the innovative device is fully effective for incubating individuals of S. canicula.

• Keywords: Scyliorhinus canicula; Scyliorhinus stellaris; embrionalni razvoj; hrskavičnjače
• Keywords (english): Scyliorhinus canicula; Scyliorhinus stellaris; embryonal development; cartilaginous fish
• Language: croatian
• URN:NBN: urn:nbn:hr:204:425431
• Study programme: Title: Fisheries and Game Management; Study programme type: university; Study level: graduate; 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: 2021-12-13 08:55:56