جستجوی مقالات مرتبط با کلیدواژه « ورمی کمپوست » در نشریات گروه « شیلات »

The present study was conducted in Chapkrud Joibar fish rearing farm and the effect of plankton and fertilizers transferring to the ponds and their effects on growth, survival of carps and plankton changes in pond were investigated. The ratios of C:N:P 88.6:7.5:1 adjusted for all treatments. The treatments consisted of 1- fertilization with 6000kg/ha per year, 2- fertilization with 12000kg/ha per year, 3- fertilization with 6000kg/ha/year and phytoplankton treatment and 4- fertilization with 12,000kg/ha per year and phytoplankton treatment. At the end of this experiment, treatment 4 provided the best growth conditions for rearing of carps. The highest initial production and number of phytoplankton per unit were observed in treatments 4 and 3, respectively, and had a significant difference with treatments 1 and 2 (P<0.05). The Ankyra, Chlorella, Scenedesmus, Tetrastrum, Spirogyra, Navicula and filamentous algae had the highest frequency of phytoplankton in ponds as primary productions. The main zooplanktons and benthos of the ponds were Rotifer, Daphnia, Copepoda, Seratopogonide and Vetivolid. Therefore, according to the research objectives, increasing the production per unit area and optimizing the amount of fertilization in pond. Treatment 4 including plankton, and fertilization with concentration of 12,000kg/year had the best results, which if it mixed with vermicompost fertilizer will improve the carps culture system.

In this study, the effect of vermicompost fertilizer and other organic fertilizers on plankton abundance, growth indices and survival of Caspian kutum fry was studied. For this purpose, Caspian Kutum fry with an initial weight of 0.15 ± 0.01 g (mean ± standard deviation) were obtained from the Shahid Rajaee fish hatchery center (Sari, Mazandaran) and transferred to a fish farm. Fish were acclimatized to the experimental conditions for two weeks. After acclimation, these fish were divided into 7 experimental treatments: control treatment (C) : no fertilizer, treatment 1 (T1): vermicompost 10 ton / hectare (1 kg / m3), treatment 2 (T2): vermicompost 15 ton / hectare (1.5 kg / m3), treatment 3 (T3): 10 ton compost / hectare (1 kg / m3), treatment 4 (T4): compost 15 ton / hectare (1.5 kg / m3), treatment 5 (T5): cow manure 10 ton / hectare (1 kg / m3), treatment 6 (T6): poultry manure 5 ton / hectare (0.5 kg / m3). The fish, with a mean weight of 0.15 ± 0.01 g, were reared for 60 days in fiberglass tanks. The results showed that application of organic fertilizers had a significant effect on growth indices. The best growth and survival performance was observed in the treatment of vermicomposting 10 ton/ha and poultry manure. Plankton populations were affected by the amount and types of organic fertilizers and the highest phytoplanktonic and zooplanktonic populations were observed in vermicomposting 10 ton/ha and poultry manure treatments. These results suggested that 10 tons per hectare of vermicompost has positive effect on growth parameters and plankton water population in fish breeding of Caspian kutum.

In this research, the effect of organic fertilizers was studied on the growth performance of carps fry. This experiment was conducted in a completely randomized design with seven treatments and three replications in 300 liters of tanks within 3 months. 60 pieces of fish fry with an average weight of 0.6 ± 0.05 g were randomly storage in each tank per 0.5: 1.5: 2: 6 (respectively, 5%, 15%, 20% and 60% respectively big head, grass carp, common carp, silver carp). Seven treatments were included control (C), vermicompost of 1 kg/m3 (T1), vermicompost fertilizer  1.5 kg/m3  (T2), compost fertilizer 1 kg/m3  (T3), compost fertilizer 1.5 kg/m3 (T4), cow manure 1 kg/m3  (T5), chicken manure 0.6 kg/m3 (T6) used in 3 replicates. Primary production, plankton and water quality parameters (temperature, chemical oxygen demand, dissolved oxygen, nitrogen-ammonium and phosphate) were measured weekly or twice weekly. At the end of the experiment period, the growth indices were measured. The results showed that the highest amount of dissolved oxygen, chlorophyll a concentration, phytoplankton and zooplankton was observed in T1 treatment and the lowest in control group (p<0.05). The highest amount of benthos was observed in T6 treatment compared to other group. Based on the results, the best growth performance was observed in T1 treatment, except to T6 treatment with other treatments (p<0.05). Overall, the results of this study suggest that vermicompost application of 1 kg/m3  can improve the quality parameters of water, plankton and performance of Carps fry.

A completely randomized experimental design in triplicates was conducted to evaluate the effects of different levels of nitrogen with the constant level of carbon and phosphorous on production of warm water fish in Chapakrod fish farm in Joybar. The treatments were use of three levels of C: N: P, respectively, 1: 5.5: 88.6 (T1) 1: 7.5: 88.6 (T2) and 1: 9.5: 6.88 (T3). The mixed chemical fertilizers and organic manures consisted of chicken, cattle feces, vermi-compost, phosphate and urea mixed together to get different levels of CNP. The effect of different concentrations of nitrogen on phytoplankton abundance and chlorophyll, were investigated as well. At the end of experiment, the highest number of phytoplankton, chlorophyll, relative growth indices were significantly different (P