Some
Reproductive Features of Brown Trout (Salmo Trutta Macrostigma
Dumeril, 1858) and Its Larval Development under Culture
Conditions
O. Demir1, İ. Gülle2, E. Gümüş3*,
F. Küçük1, A. Günlü1 and K.Kepenek4
1Fisheries Faculty,Süleyman Demirel University,
Eğirdir-Isparta, Turkey; 2Science and Arts Faculty,
Mehmet Akif Ersoy University, Burdur, Turkey; 3 Fisheries
Faculty,Akdeniz University,
07058, Antalya, Turkey; 4Agriculture Faculty, Süleyman
Demirel University, Isparta, Turkey *Corresponding Author: egumus@akdeniz.edu.tr
Abstract
In this study, some
reproductive features of wild brown trout (Salmo trutta macrostigma
Dumeril, 1858) populations in Aksu, Eşen, Alara and Alakır streams in Turkey were examined and larval development was
also investigated in two different culture conditions established on Eşen Stream
(Trial 1) and at the Research Unit of Eğirdir Faculty of Fisheries at SüleymanDemirelUniversity
(Trial 2). The spawning time of brown trout in Aksu Stream in
the second half of December was different from other localities, at the end of
the January and in the first week of February. The
gonadosomatic index values ranged between 17.5 and 19.8%, the mean egg diameters
of females in all localities were between 3.51 and 3.78 mm (P<0.05). The
incubation lasted 370 and 390 day-degree (10.5-10.9 ºC), and the
yolk-sac of the larvae was absorbed in 28 and 32 days in trials 1 and 2, respectively. The mean live weight
(LW), total length (TL) and mouth widths (MW) in start-fed larvae and those with
absorbed yolk-sac in both trials showed non significant differences before the
25th day of the trial. On the 25th, 50th, 75th
and 100th day, the
mean LW, TL and MW values of the larvae in the trial 1, however,
ranged from 108.30 to 547.30 mg, 23.05 to 42.74 mm and 2441 to 3993 µm; whereas these
values in trial 2 were measured as 91.30 to 366.60 mg; 20.04 to 35.18 mm and
2123 to 3386 µm,
respectively. The differences among the mean values were found to be significant
(p<0.05).
Key words:
Brown trout,
Fish culture,
Larval development,
Reproductive, S. trutta macrostigma