EJPAU 2009. Dziewulska K. , Domagała J. ASYMMETRY OF MALE GONAD OF THE SEA TROUT (<I>SALMO TRUTTA TRUTTA</I> L.) IN THE FIRST YEAR OF LIFE

Electronic Journal of Polish Agricultural Universities (EJPAU) founded by all Polish Agriculture Universities presents original papers and review articles relevant to all aspects of agricultural sciences. It is target for persons working both in science and industry,regulatory agencies or teaching in agricultural sector. Covered by IFIS Publishing (Food Science and Technology Abstracts), ELSEVIER Science - Food Science and Technology Program, CAS USA (Chemical Abstracts), CABI Publishing UK and ALPSP (Association of Learned and Professional Society Publisher - full membership). Presented in the Master List of Thomson ISI.

2009
Volume 12
Issue 2

Topic:

Fisheries

ELECTRONIC
JOURNAL OF
POLISH
AGRICULTURAL
UNIVERSITIES

Dziewulska K. , Domagała J. 2009. ASYMMETRY OF MALE GONAD OF THE SEA TROUT (SALMO TRUTTA TRUTTA L.) IN THE FIRST YEAR OF LIFE, EJPAU 12(2), #16.
Available Online: http://www.ejpau.media.pl/volume12/issue2/abs-16.html

ASYMMETRY OF MALE GONAD OF THE SEA TROUT (SALMO TRUTTA TRUTTA L.) IN THE FIRST YEAR OF LIFE

Katarzyna Dziewulska¹, Józef Domagała²
¹ Department of General Zoology, University of Szczecin, Poland
² Department of General Zoology, University of Szczecin, Szczecin, Poland

ABSTRACT

Paired gonads occur in the majority of teleostean fish species. In females a greater mass and fertility of the left one ovary has often been reported, while much less attention has been devoted to a comparative analysis of gonads in males. In this study an assessment of asymmetry of male gonads in sea trout in the first year of life has been made on the basis of their mass determination. The observations were made on 218 males, aged 5–6.5 and 12 months, caught in the streams located in north-western Poland. In the first year of life, immature and mature testis shown asymmetry. In the majority of males studied (77%) the left gonad was greater. In 5% of the males the gonads were of the same size, while in 18% of the males the right was greater. The mass of the right gonad was on average 79% of the mass of the left testis. The difference in mass between left and right gonads was on average 14% of the mass of both gonads (21% of the larger gonad) and was statistically significant p<0.001. The statistically significant differences in mass between the left and right gonad were from 6-month old males. In the separated groups of male with a greater left gonad, the difference in mass between larger and smaller gonads was twice greater than in the group with the greater right gonad. Differences between mass of left and right gonads in immature and mature males were similar (chi-squared test, p>0.05).

Key words: asymmetry, Salmo trutta, sea trout, testes.

Katarzyna Dziewulska
Department of General Zoology, University of Szczecin, Poland
Felczaka 3c, 71-412 Szczecin, Poland
phone: +48 91 444-1619
fax +48 91 444-1623
email: katarzyna.dziewulska@univ.szczecin.pl

Józef Domagała
Department of General Zoology, University of Szczecin, Szczecin, Poland
Z. Felczaka 3C
71-412 Szczecin
Poland
phone: +48 91 444 16 24
email: jozef.domagala@univ.szczecin.pl

Responses to this article, comments are invited and should be submitted within three months of the publication of the article. If accepted for publication, they will be published in the chapter headed 'Discussions' and hyperlinked to the article.