Histological and morphometric analysis of gonads in the male spiny dogfish (Squalus acanthias L.) in the Adriatic Sea

Posavec, Ivan (2012) Histological and morphometric analysis of gonads in the male spiny dogfish (Squalus acanthias L.) in the Adriatic Sea. Diploma thesis, Faculty of Science > Department of Biology.

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Abstract

In period between years 2005 and 2007 in the northern Adriatic Sea, 61 specimens of the male spiny dogfish (Squalus acanthias L.) were collected by on-board observers on five commercial bottom trawls. Fishing vessels operated in area between 44°32’ and 43°44’ N, and 15°05’ and 14°40’ E. The collected specimens were measured and gonads were isolated. On the collected testicles we utilized morphometric and histological examination in order to analyze development of gonads. Morphometric results showed that the total body length of the specimens ranged from 30,0 cm to 81,6 cm (average ± SD: 53,50 ± 14,13) and the length at which males reach sexual maturity is over 55 cm. Histological analyses of the gonads identified six stages of the spermatogenesis. Based on the period in which specimens were collected, the sample was divided in 4 groups. Stereological analyses on testical histological slides showed high level of mature spermatocyst in a group of November-December, indicating those months to be the species’ mating activity period.

Item Type: Thesis (Diploma thesis)
Keywords: spiny dogfish, the northern Adriatic Sea, gonads
Supervisor: Lacković Venturin, Gordana
Date: 2012
Number of Pages: 37
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Grozdana Sirotic
Date Deposited: 04 Mar 2014 12:44
Last Modified: 16 Feb 2016 14:03
URI: http://digre.pmf.unizg.hr/id/eprint/517

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