Morfometrijske i merističke značajke roda Ameiurus (Actinopterygii) u Hrvatskoj

master's thesis

• Title (english): Morphometric and meristic characteristics of the genus Ameiurus (Actinopterygii) in Croatia
• Author: Lana Novosel
• Mentor: Milorad Mrakovčić (mentor)
• Committee member: Milorad Mrakovčić (predsjednik povjerenstva)
• Committee member: Zlatko Liber (član povjerenstva)
• Committee member: Vesna Benković (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2011, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Ribe roda Ameiurus unesene su u Hrvatske vode 1905. godine. Znanje o taksonomiji i rasprostranjenosti roda Ameiurus u Hrvatskoj oskudno je. Ovim istraživanjem utvrđeno je koja je vrsta roda Ameiurus prisutna u Hrvatskoj. Tokom istraživanja obrađeno je 130 jedinki sa 8 šaranskih ribnjaka u Hrvatskoj. Izmjereno je 25 morfometrijskih mjera i broj šipčica u leđnim, podrepnim, prsnim i trbušnim perajama. Mjerenja pokazuju da sve jedinke pripadaju vrsti Ameiurus melas (crni somić), a ne vrsti Ameiurus nebulosus (patuljasti somić), kako se dosada pretpostavljalo. Prema ukupnoj i standardnoj duljini tijela, te prema masi, jedinke su svrstane u razrede, te je određena apsolutna i relativna frekvencija. Struktura istraživane populacije vrste Ameiurus melas pokazuje da su najbrojnije jedinke ukupne duljine tijela (LT) od 80 do 100 mm i od 180 do 200 mm. Istraživana populacija pretežno sadrži jedinke manje tjelesne mase, odnosno veliki broj mladih jedinki. Merističke značajke, odnosno broj šipčica u perajama pokazuje da nema bitnih odstupanja u broju mekih šipčica od onoga što navode drugi autori, ali u podrepnoj peraji je zapaženo variranje u broju mekih šipčica. Broj šipčica prikazan je perajnom formulom. Statističkom obradom podataka, korištenjem metode glavnih komponenata utvrđeno je da između istraživanih populacija iz različitih ribnjaka s područja Hrvatske na postoje značajnije morfometrijske razlike.

Abstract (english)

Fish of the genus Ameiurus were introduced in Croatian freshwaters in 1905. Knowledge about taxonomy and distribution of the genus Ameiurus in Croatia is scarce. In this investigation it is determined which of the species of the genus Ameiurus is present in Croatia. In the research, 130 fish from 8 carp fisheries were analyzed. 25 morphometric measures were measured and number of fin rays in the dorsal, anal, pectoral and ventral fin were measured. Measurements show that all of them belong to species Ameiurus melas (black bullhead), and not the species Ameiurus nebulosus (brown bullhead) what was assumed. By total and standard body lenght and by body weight, fish were categorized and absolute and relative frequency were determined. Structure of the investigated population of the species Ameiurus melas showes that most fish have total lenght (LT) between 80 and 100 mm and 180 and 200 mm. Most of the fish of the investigated population have a lower body weight, which means that most of them are young individuals. Meristic characteristics, number of fin rays, show that there are no relevant differences in the number of fin rays stated by other authors, but in the anal fin, variation in the number of soft fin rays is noticed. Number of fin rays is presented by a formula. In the statistical analysis of the data, principal component analysis was used. Results show that there are no relevant morfphometric differences between the fish of the investigated populations from different fisheries in Croatia.

• Keywords: ribe; rod Ameiurus; Ameiurus nebulosus; Ameiurus melas; ribnjak; alohtone vrste; morfometrijske značajke; merističke značajke
• Keywords (english): fish; genus Ameiurus; Ameiurus nebulosus; Ameiurus melas; fishery; introduced speices; morphometric characteristics; meristic characteristics
• Language: croatian
• URN:NBN: urn:nbn:hr:217:394094
• Study programme: Title: Biology; specializations in: Ecology; Course: Ecology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra biologije (magistar/magistra biologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2018-04-09 10:43:39