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Showing 3 results for Stocking Density
Volume 2, Issue 4 (10-2000)
Abstract
Three stocking densities (20, 40, and 60 sheep/ha) were applied in four stocking periods
(0, 2, 4, and 6 weeks) on a Medicago truncatula cv. Paraggio pasture. Treatments were arranged
in a split plot system and compared through a completely randomised block design
with four replications.Grazing period had a significant effect (P<0.001) on availability
of both medic and other species separately. Total available forage (medic and other
species) was significantly affected by both stocking density (P<0.05) and grazing period
(P<0.001) and there was a significant interaction between stocking density and grazing
period (P<0.001). Grazing period was the only factor affecting the cumulative forage production
of medic and other species. Stocking density and grazing period both had significant
effects on total cumulative pasture production. Pod production significantly decreased
as grazing period increased. More seeds per pod were observed at low stocking
density as compared with other densities. There was a dramatic reduction in seed production
as grazing period increased (P<0.05).
Habib Sarsangi Aliabad, , , , , , ,
Volume 6, Issue 2 (9-2017)
Abstract
Abstract:
An experiment was conducted to evaluate the effects of stocking density on growth and survival of Nile tilapia (Oreochromisniloticus) in brackish water earthen pond. Fish with initial weight of 13 g kept in three stocking density 3, 6 and 9 fish/m2 in duplicates and were fed on rainbow trout feed for 105 days during the light period. The results showed significant reduction in final weight, weight gain, daily growth rate, specific growth rate and survival by increasing stocking density, while feed conversion ratio enhanced in higher stocking densities (p< 0.05). Among the treatments evaluated, 3 fish/m2 showed the best growth rate and survival, and the lowest feed conversion ratio. So, it seems that to achieve the highest profit, the stocking density of 3 fish/m2 is suitable for culturing of tilapia in earthen pond.
A. Irani , N. Agh,
Volume 8, Issue 1 (3-2019)
Abstract
Aims: In this research, we investigated the effects of stocking density on growth performance and survival rate of Persian sturgeon and Beluga.
Materials and Methods: Stocking densities for treatments 1-5 of Persian sturgeon in stages 1 were 6, 8, 10, 12 and 14 fish/l (initial weight: 116mg) and in stage 2 were 1, 2, 3, 4 and 5 fish/l (initial weight: 2218/6mg). Stocking densities of five months old Beluga juveniles (initial weight: 109.95g) for treatments 1-5 were 80, 100, 120, 140 and 160 fish/m3 in each 250-liter tank respectively.
Findings: Growth and feeding parameters were affected as the stocking densities increased in both species. In stage 1 in terms of weight, SGR and food efficiency, treatments 1 and 2 showed significantly higher values (p<0.05) comparing with treatment 5, treatments 4 and 5 and all treatments respectively. In stage 2, there are significant differences amongst the all treatments in terms of weight and SGR except treatments 3 and 4. Food efficiency in treatment 1 was significantly higher (p<0.05) than the rests except treatment 2. In Beluga, there were significant differences amongst all treatments except treatments 3 and 4 in terms of weight, SGR, and food efficiency and the highest values were observed in treatment 1.
Conclusion: The best stocking densities for stage 1 and 2 of Persian sturgeon were 8-10 and 1-2 fish/l respectively and for Beluga, juveniles were 80-100 fish/m3.
