Histološka i stereološka analiza gonada mužjaka psa mekuša Mustelus punctulatus (Risso, 1826) u sjevernom Jadranu

master's thesis

• Title (english): Histological and stereological analysis of male gonads in blackspotted smoothhound Mustelus punctulatus (Risso, 1826) in the northern Adriatic Sea
• Author: Mateja Kralj
• Mentor: Gordana Lacković-Venturin (mentor)
• Committee member: Gordana Lacković-Venturin (predsjednik povjerenstva)
• Committee member: Dubravka Hranilović (član povjerenstva)
• Committee member: Sven Jelaska (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2012-02-06, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Pas mekuš, Mustelus punctulatus (Risso, 1826) je komercijalna vrsta pridnenog morskog psa, potencijalno ugrožena zbog izlovljavanja u sjevernom Jadranu. Analizirano je 95 muških jedinki, prikupljenih na pridnenim koćama u sjevernom Jadranu, tijekom veljače 2005. - srpnja 2007. godine. Ukupna dužina tijela (TBL) prikupljenih životinja bila je između 44,6 - 126,5 cm, sa srednjom vrijednošću 76,4 ± 21,4 cm. Usporedbom TBL i mase životinja dobivena je pozitivna Spearmanova korelacija (rs = 0,985, p < 0,05), kao i usporedbom TBL i mase gonada (rs = 0,852, p < 0,05). Najmanja životinja kod koje su utvrđeni počeci spermatogeneze, imala je TBL 67,4 cm, dok je najmanji spolno zreli mužjak imao TBL 79,8 cm. Dobiveni rezultati ukazuju da mužjaci spolnu zrelost dostižu kod dužina tijela > 80 cm. Gonadosomatki indeks i prisutnost najrazvijenijih stadija spermatogeneze u testisima ukazuju na rast gonada tijekom jeseni, parenje u zimskim i proljetnim mjesecima, te fazu mirovanja tijekom ljeta.

Abstract (english)

Blackspotted smoothhound, Mustelus punctulatus (Risso, 1826) is a commercial species, potentially endangered, as a result of excessive fishing in the northern Adriatic sea. From February 2005 until July 2007, 95 male sharks were collected with bottom trawlers on the territory of the northern Adriatic Sea. Total body length (TBL) of collected animals was between 44,6 - 126,5 cm, with the medium value 76,4 ± 21,4 cm. Comparison between TBL and animal body mass gave a positive Spearman's correlation (rs = 0,985, p < 0,05), as well as the comparison between TBL and gonad mass (rs = 0,852, p < 0,05). The smallest animal with onset of spermatogenesis, has had TBL 67, 4 cm, while smallest sexualy maturated mail had TBL 79, 8 cm. Gonadosomatic index and the presence of most developed spermatogenetic stages in testes suggest a gonad growth during the autumn, mating in winter and spring months, and the inactive phase during the summer.

• Keywords: pas mekuš; testisi; spolna zrelost; sjeverni Jadran; morfometrija
• Keywords (english): blackspotted smoothhound; testes; sexual maturity; northern Adriatic; morphometry
• Language: croatian
• URN:NBN: urn:nbn:hr:217:872469
• Study programme: Title: Experimental Biology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra eksperimentalne biologije (magistar/magistra eksperimentalne biologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2017-05-02 09:11:11