Gonadal cycle of mussel Dreissena polymorpha (Pallas, 1771) in the dam reservoir Dubrava

Babić, Petra (2013) Gonadal cycle of mussel Dreissena polymorpha (Pallas, 1771) in the dam reservoir Dubrava. Diploma thesis, Faculty of Science > Department of Biology.

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The one-year study of a gonadal cycle of a mussel Dreissena polymorpha was conducted on a population of the dam reservoir Dubrava. Developmental stages of gonads were analyzed on slides made by classic histological techniques. The sex ratio was approximately 1:1, and hermaphrodites were not found. Gametogenesis begins in autumn. The spawning occurs during late spring and summer. Most individuals reproductive cycle ends in July. The highest average value of sexual maturity index were determinated in July, and lowest in August. Differences between two sexes ocurred in the timing of the resting phase and gametogenesis, while during the spawning males and females were synchronized. The presence of endoparasites trematoda Echinoparyphium recurvatum, Bucephalus polymorphus i Aspidogaster sp. was identified, which negatively affects the development of the gonads.

Item Type: Thesis (Diploma thesis)
Keywords: reproductive cycle, gonad stages, sexual maturity index, trematoda
Supervisor: Lajtner, Jasna
Date: 2013
Number of Pages: 42
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Grozdana Sirotic
Date Deposited: 20 Feb 2014 13:12
Last Modified: 22 Sep 2014 09:28
URI: http://digre.pmf.unizg.hr/id/eprint/450

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