February 15-18, 2009 Washington State Convention Center Seattle ...

CAN CROWDING DENSITY AFFECT ON BODY COMPOSITIO OF PERSIAN STURGEON
LARVAE?
Bahram Falahatkar, Mahmoud Shakoorian, Anooshirvan Ebrahimzadeh and Fereshteh Zahedi
Fisheries Department,
University of Guilan, Faculty of Natural Resources
Sowmeh Sara
P.O. Box 1144
Guilan, Iran
falahatkar@guilan.ac.ir
A 2-week culture of Persian sturgeon (Acipenser persicus) larvae was conducted with different densities in circular tanks. The
initial densities were 3500, 4000, 4500, 5000, and 5500 larvae/m 2 . Start weight of fish was 46.7 ± 6.8 mg with 18.3 ± 1.4 mm
length. Fish were fed with Artemia nauplii and then Daphnia every 3 h. At the end of the experiment, there were significant
differences in final weight among treatments, whereas the highest (167 ± 11.8 mg) and the lowest weight (129.2 ± 4.8 mg)
were observed at the lowest and highest density, respectively (Fig. 1). According to number of mortality, no significant differences
were observed between various densities. Proximate analysis of whole body showed no significant difference concerning
to moisture, protein, fat and ash contents. The Results of this study showed that high density of fish during larval rearing of
Persian sturgeon might affect on growth and some abnormalities but not on proximate composition during this short period of
rearing.
Weight (mg)
200
180
160
140
120
100
80
60
40
20
0
1 2 3 4 5
Larval Treatments
Fig. 1. Final weight of Persian sturgeon larvae held on different
stocking density after 2 weeks.