Artificial reproduction in 1-year-old
tench (Tinca tinca L.)
R. Rodríguez, J.D. Celada, M. Sáez-Royuela,
J.M. Carral, A. Aguilera, P.M.
Melendre-2004
Journal of Applied Ichthyology, 20(6): 542-544
Summary:
Although it is generally accepted that sexual maturity of tench (Tinca
tinca L.) is not reached before 2-3 years of age, a successful experiment on artificial reproduction in
1-year-old tench is described. It was possible to obtain semen and eggs from
48% of males and 27.7% females kept in a small concrete tank at a final
density of 3 kg m-3 and fed on a commercial dry diet. Two
hormonal treatments were applied: the first with 1354 degree-days and
the second with 2353 degree-days. In each experiment, the positive
response in males and females was around 80%. Total egg production exceeded
11% of body weight, fertilization rate was above 90% and hatching rates
around 50%. These results differ little from those reported for older
breeders.
(Departamento de Producción Animal II, Universidad de León, Campus
de Vegazana s/n, E-24071 León, Spain, E-mail of J.M. Carral: dp2jcl@unileon.es)