Hacer Okgerman  , Muammer Oral  , Sibel Yigit  , 
    Biological Aspects of <I>Rutilus rutilus</I> (Roach) in Sapanca Lake (Turkey),
    Journal of Animal and Veterinary Advances,
    Volume 8,Issue 3,
    2009,
    Pages 441-446,
    ISSN 1680-5593,
    javaa.2009.441.446,
    (https://makhillpublications.co/view-article.php?doi=javaa.2009.441.446)
    Abstract: The age and the growth parameters of the roach (<I>Rutilus rutilus</I> L., 1758) caught in Sapanca Lake were investigated monthly between October 2000 and September 2001. The age values of the 398 roach caught were between 1 and 9 and the majority of the fish consisted of individuals of the 5 and 6 age group. The difference between the average lengths with respect to sex was significant in 1, 2, 5 and 8 age groups (p&lt;0.05). The von-Bertalanffy equation was determined with L<SUB>t</SUB> = 31.87 (1-e<SUP>0.195(t+0.034)</SUP>); W<SUB>t</SUB> = 380.91 (1-e<SUP>0.195(t+0.034)</SUP>)<SUP>3</SUP> for males and L<SUB>t</SUB> = 47.19(1-e<SUP>0.109 (t+0.056)</SUP>; W<SUB>t</SUB> = 1256.93 (1-e<SUP>0.109(t+0.056)</SUP>)<SUP>3</SUP> for females. The relationships between length and weight were found highly significant (r = 0.99). The differences of mean length, weight and condition factors between females and males in the same length groups were compared. The length-weight correlation was found to be W = 0.014 L<SUP>2.933</SUP> for male and W = 0.013 L<SUP>2.972</SUP> for female. The mean values of condition factors (K) of females and males were determined as 1.241&plusmn;0.02 and 1.221&plusmn;0.03, respectively.
    Keywords: Roach;Rutilus rutilus L.;1758;length-weight relationship;the von bertalanfy growth equation;Sapanca Lake