نویسندگان
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
Rutilus firisii kutum is one of the important fish in Caspian Sea that has significant
economical role to the region. The overall objective of the project is to compare the growth
and survival of Rutilus frisii Kutum larvae under conventional conditions and conditions
under use of organic fertilizer by anaerobic fermentation or slurry. This study was conducted
in nine 1.7 hec pounds with 3 treatments with stocking densities of 1.7 million fish larva at Dr
Yousefpoor Center at Siakal Village, 32km far from city of Rasht in North of Iran. The first
treatment considered as control using concentrated food and grinded kilka fish. In the second
treatment, the pound was supplied only by slurry for 13 days followed by concentrated fish
food. The third treatment started with slurry for 13 days followed by slurry and concentrated
food together. The physical and chemical parameters of water, plankton, biometry of fish,
growth indices were monitored weekly. The result indicated that production was 1.7 to 2
times higher in slurry than traditional treatment also the survival rate was 1.7 times higher in
slurry treatment. Slurry with several active substances is more effective and can promote the
growth of zooplanktons that is the food for larval stage of Rutilus frisi kutum. Nutritional
contents of phosphorous, nitrogen, calcium, magnesium, potassium, protein and lipid after
anaerobic fermentation were higher in slurry treatment than control. The blue-green algae
density in slurry pounds was less than control.
کلیدواژهها [English]
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