Prehrana pastrvskog grgeča (Micropterus salmoides) u Baćinskim jezerima

master's thesis

• Title (english): Diet of the largemouth bass (Micropterus salmoides) in the Baćina lakes
• Author: Martina Talajić
• Mentor: Zoran Marčić (mentor)
• Committee member: Zoran Marčić (predsjednik povjerenstva)
• Committee member: Anamaria Štambuk (član povjerenstva)
• Committee member: Sandra Hudina (član povjerenstva)
• Committee member: Ivana Maguire (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2022-09-26, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Pastrvski grgeč endem je Sjeverne Amerike, koji je zbog popularnosti u sportskom ribolovu
rasprostranjen po cijelom svijetu, a danas se nalazi na listi od 100 najinvazivnijih vrsta svijeta.
U Hrvatsku je unesen krajem 60-ih godina, a u Baćinskim jezerima je zabilježen 2019.
godine. Prehrana pastrvskog grgeča do sada nije istraživana, stoga je glavni cilj ovoga rada
bio odrediti kvalitativni i kvantitativni sastav prehrane ove vrste u Baćinskim jezerima. Uzorci
su prikupljani u razdoblju od 2019. do 2021. godine. Ukupno je prikupljeno 188 jedinki, a
uzorci probavila i sadržaja želuca su obrađeni u Laboratoriju za kralješnjake. Najučestalija
vrsta u sadržaju želudaca po brojnosti, masi i frekvenciji je kozica Palaemonetes antennarius.
Rezultati su pokazali kako su glavni tipovi hrane skupine riba razreda Actinopteri i rakovi
deseteronošci (Decapoda), a kukci (Insecta) slučajan su plijen u prehrani. Identificirane su
dvije endemske vrste Pomatoschistus canestrinii i Rutilus basak. Također, zabilježene su
vrste Atherina boyeri i Gambusia holbrooki, a uočen je i kanibalizam. Najučestalija među
piscivornim plijenom je porodica Gobiidae. Pastrvski grgeč u jezerima ima pozitivan
alometrijski rast. Sukladno dobivenim rezultatima prehrane i sposobnosti brze prilagodbe
novom staništu, pastrvski grgeč predstavlja prijetnju autohtonim zajednicama riba u
Baćinskim jezerima.

Abstract (english)

Largemouth bass is endemic species to North America which is distributed all around the
world due to its popularity in sport fishing and is listed in 100 most invasive species in the
world. It was introduced in Croatia at the end of the 60s and recorded in 2019´ in Baćina
lakes. The main aim of this study was to determine qualitative and quantitative diet
composition. Samples (188 in total) were collected since year 2019 – 2021, and stomach
contents were processed in vertebrate laboratory. Most common species by the abundance,
weight and frequency occurrence in stomach content was grass shrimp Palaemonetes
antennarius. Results show groups of Actinopteri and Decapoda are main food prey and the
Insecta were accidental prey. Two endemic fish species were identified: Pomatoschistus
canestrinii and Rutilus basak. Species Atherina boyeri i Gambusia holbrooki were also
recorded, along with cannibalism. The most common family in piscivore diet found in
stomach content was Gobiidae. Largemouth bass in lakes has positive allometric grow.
Considering these results and the capability of quickly adjustment to new area, largemouth
bass presents a threat to the native species in Baćina lakes.

• Keywords: Invazivna vrsta; sadržaj želuca; plijen; Palaemonetes antennarius; Gobiidae
• Keywords (english): Invasive species; stomach content; prey; Palaemonetes antennarius; Gobiidae
• Language: croatian
• URN:NBN: urn:nbn:hr:217:046935
• Study programme: Title: Ecology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra ekologije i zaštite prirode (magistar/magistra ekologije i zaštite prirode)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Embargoed access; Embargo expiration date: 2024-09-26
• Created on: 2022-10-21 10:24:41