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.
2010
Volume 13
Issue 2
Topic:
Fisheries
ELECTRONIC
JOURNAL OF
POLISH
AGRICULTURAL
UNIVERSITIES
Czerniawski R. , Pilecka-Rapacz M. , Domagała J. 2010. GROWTH AND SURVIVAL OF BROWN TROUT FRY (SALMO TRUTTA M. FARIO L.) IN THE WILD, REARED IN THE HATCHERY ON DIFFERENT FEED, EJPAU 13(2), #04.
Available Online: http://www.ejpau.media.pl/volume13/issue2/abs-04.html

GROWTH AND SURVIVAL OF BROWN TROUT FRY (SALMO TRUTTA M. FARIO L.) IN THE WILD, REARED IN THE HATCHERY ON DIFFERENT FEED

Robert Czerniawski, Małgorzata Pilecka-Rapacz, Józef Domagała
Department of General Zoology, University of Szczecin, Szczecin, Poland

 

ABSTRACT


The paper shows the results of different types of food used in rearing and the impact of the food on the further survival and growth of brown trout fry (Salmo trutta m. fario L.) in the wild. Rearing of larvae was conducted in three groups: 1) zooplankton-fed group, 2) chironomids-fed group and 3) pellet-fed group. During the rearing period, the pellet-fed group reached the greatest SGR value – 4.25% day-1, while the zooplankton-fed group reached 4.25% day-1. The chironomid-fed group were characterised by the lowest SGR value (1.94% day-1). In the wild, the zooplankton-fed group achieved the greatest rate of survival (60%) and high data of SGR (2.23% day-1). The zooplankton-fed group's survival and growth rate was higher than the pellet-fed group survival (38%) and SGR (1.87% day-1). In the wild, the chironomid-fed group reached the lowest rates of survival (23%), but the fork length and weight results were not different in comparison to the zooplankton-fed group. Moreover, the SGR result of this group was the highest – 2.55% day-1. We stated that rearing of brown trout larvae
on live zooplankton had a positive effect on survival and growth of brown trout fry in the wild.

Key words: Salmo trutta, rearing, foraging skills, stocking.


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

Małgorzata Pilecka-Rapacz
Department of General Zoology, University of Szczecin, Szczecin, Poland
Z. Felczaka 3C
71-412 Szczecin
Poland
phone: +48 91 444 16 24

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.