ORBi: Nzau Matondo Billy Nzau - Reproductive behaviour and sexual production in the first-generation hybrids of roach Rutilus rutilus L. x common bream Abramis brama L

Reference : Reproductive behaviour and sexual production in the first-generation hybrids of roach Ru...


	Document type :	Scientific journals : Article
	Discipline(s) :	Life sciences : Zoology
	To cite this reference:	http://hdl.handle.net/2268/79198

Title :	Reproductive behaviour and sexual production in the first-generation hybrids of roach Rutilus rutilus L. x common bream Abramis brama L
Language :	English
Author, co-author :	Nzau Matondo, Billy Nzau [> >]
	Ovidio, Michaël [Université de Liège - ULg > > Laboratoire de Démographie des Poissons et Hydroécologie (LDPH) > >]
	Philippart, Jean-Claude [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Biologie du comportement - Ethologie et psychologie animale >]
	Poncin, Pascal [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Biologie du comportement - Ethologie et psychologie animale >]
Publication date :	Jun-2011
Journal title :	Journal of Applied Ichthyology
Publisher :	Blackwell Publishing
Volume :	27
Issue/season :	3
Pages :	859-867
Audience :	International
ISSN :	0175-8659
City :	Berlin
Country :	Germany
Keywords :	[en] Hybridisation ; Rutilus rutilus ; Abramis brama ; Reproductive behaviour
Abstract :	[en] The aim of this study was to further test the viability of the roach Rutilus rutilus · common bream Abramis brama hybrid in terms of reproductive behaviour and sexual production. Egg release, mating and aggressive acts in reproductive behaviour, as well as absolute fecundity and sperm density in milt for sexual production were examined in the first generation of these hybrids at their first sexual maturity. The F2 and backcrosses of hybrids were also studied. The results revealed that these hybrids expressed a normal and typical mating behaviour, producing viable gametes. Under experimental reproduction between hybrids (hybrid reproduction), the number of egg-release acts (range, 21–66) was nearer (v2 test, P > 0.05) the number of mating acts (11–65). Moreover, hybrid males exhibited territorial and aggressive behaviours. However, in experimental reproduction of female and male hybrids mixed with parental males (mixed reproduction), the egg-release act and the mating act were inhibited by the intense territorial and aggressive activities of the common bream male. Absolute fecundity values (median, <2.2 · 103 eggs) and sperm density (<7 · 109 spermatozoa ml)1) of hybrids showed a greater decrease (U test, P < 0.05) than in parental species (median, >6.0 · 103 eggs and >14 · 109 spermatozoa ml)1, respectively). Nevertheless, these hybrids were fertile. F2 and backcross generations were produced, although with a significantly lower viable hatching rate (FEP test, P < 0.05) in F2 individuals from the female and its corresponding hybrid male (<6%), indicating a very low chance of survival in rivers.
Target :	Researchers ; Students
Permalink :	http://hdl.handle.net/2268/79198
DOI :	10.1111/j.1439-0426.2010.01603.x

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