Journal of Aquaculture Development
Year:2020 | Volume:14 | Issue:2|Papers Count:10

The present study was conducted to evaluate some of the physic-chemical parameters(Temperature, pH, Salinity, Dissolved Oxygen, nitrite, Hardness, Nitrite-Nitrogen, Ammonia, Transparency and clorophyll a) affecting the growth of Western Pacific shrimp (Litopenaeus vannamei) in 9 semi-intensive shrimp ponds (at the 3 farms) During a one period culture (six month) at villages in northern of Tiab, Minab area, Hormozgan province. The results showed that the ranged water temperature were (36. 03 ± 0/07± 17. 9 ± 1. 59), pH (8. 53 ± 0. 12-7. 61± 0. 01), salinity (51. 04± 3. 28±-44. 00± 0. 5), dissolved oxygen (7. 85 ± 0. 73 mg. l-2. 76± 0. 07 mg. l), nitrite(36. 9± 10. 1μ m. l-1. 45± 0. 17μ m. l ) Ammonia (0. 06 ± 0. 01-0. 01± 0. 001 mg. L), Transparency (67. 92± 7. 3-31. 3 ± 0. 09 cm) and chlorophyll a (156. 2 ± 11. 32 μ g. l-31. 33± 1. 22 μ g. l l). The results of hierarchical cluster analysis showed that water quality in the second farm was far more unfavorable than the first and third farms. The Hierarchicalcluster analysis showed that the water quality in the second farm was much less favorable than the first and third farms. Based on PCA, chlorophyll a is affected by pH, transparency, dissolved oxygen and nitrate with high factor loading. As well as pH, oxygen, transparency and chlorophylla, as a differentiating factor between shrimp farms were identified. In this study, some of parameters such as water temperature, dissolved oxygen, salinity, transparency and chlorophyll a, were sometimes outside the ideal range for the cultivation of L. vannamei.

In this study, the effects of different concentrations of ) Arthrospira platensis ( on the growth and antioxidant defense mechanism of koi fish (Cyprinus carpio (were investigated during a 8 weeks culture period. ). An experiment was designed with five treatments, including diets with 0, 2. 5, 5, 7. 5 and 10% of Arthrospira platensis and each with three replicates. One hundred and fifty koi fish with average initial weight of 30± 1g were assigned to fifteen experimental tanks. The results revealed that the Superoxide dismutase(SOD) and catalase(CAT) activity level in 10% (Arthrospira platensis) treatments demonstrated a significant increase compared to the control group (P<0. 05) and in all samples taken at different treatments of the experiment did not show any significant differences(P>0. 05). Liver enzymeze also decreased significantly by dietary supplementation (p<0. 05). Also Koi fish fed with 2. 5% A. platensis showed a signifi cant lower growth performance than those fed with 7. 5 and 10% A. platensis (p<0. 05). These results revealed that, inclusion of 10% A. platensis in diets did appear to have a signifi cant positive effect on antioxidant defense mechanism, liver enzymes activities and growth rates of koi fish.

from Karkhe river (khouzestan, Iran) were determined. 84 sample were collected in the middle month of each season and Total fatty acid compositions were investigated by a gas chromatographic method. . The most abundant fatty acids in the (SFAs) of the liver and muscle were at the highest in the autumn and spring, respectively. The total monounsaturated fatty acids (MUFAs) were at the highest in the summer, autumn for liver and in the autum, winter for muscle. the lowest total n-3 PUFA levels were for the liver and muscle in the autum. n-3/ n-6 ratio were at the highest in the spring for the both liver and muscle.

This research was carried out with the aim of analyzing the training needs of trout breeders in Arak city. The statistical population of this study was trout breeders in Markazi province, Arak city (N = 70). Sampling was done using simple random sampling method. Sixty trout farmers were selected in Arak city. The research instrument was a questionnaire which verified its reliability and validity using expert opinions and Cronbachchr('39')s alpha coefficient (α =0. 85). Using the resource review, the Borich Measurement Model and the weighted average scores, 31 capabilities were required for trout breeders. The results of the research showed that the needs of market research and recognition and new ways of selling, storing, fishing time, clear water pool and clearing, and the most important educational needs of fish growers in individual-professional components, Technical and pool features. Also, the results of logistic regression analysis showed that individual attitudes to aquaculture, the level of education of a person, the company used in educational training programs for aquaculture, how individuals access to information resources, the area of the fish farming pool and the gender of the individual, the most influential variables. The skill level of the exploiters in the field of fish farming.

In this study, the effects of commercial synbiotic Biomin® IMBO at 1 and 5 g kg-1 incorporated in control diet on growth performance, some biochemical parameters and skin mucosal immunity was investigated in crucian carp (Carassius carassius). Fish (8. 03 ± 0. 36 g) were randomly distributed among nine aquaria with 12 fish per each aquarium and fed different diets for 45 days. With 5 g kg-1synbiotic, the growth rate increased significantly in comparison with the control group (P < 0. 05). When fish administrated with both treatment diets the glucose and cholesterol levels in fish serum significantly decreased in comparison with the control group (P < 0. 05). Similarly, lysozyme and protease activities in fish skin mucus of both treatment groups increased significantly compared to the control group (P < 0. 05). Based on the current results, supplementation of synbiotic Biomin® IMBO, especially at 5 g kg-1 can significantly enhance the growth performance, some biochemical parameters, and skin mucosal immunity in crucian carp.

Aquaculture development and construction materials have reduced water health. In this study, we have measured the water quality parameters of Mohammad Abad River, has a mean role in flood control, Fazelabad water supply and ecological balance, compared it with surface water standards. The value of Water Temperature, Turbidity, Dissolved Solids, Salinity (EC), Phosphate, Nitrate, Nitrite, Ammonia, Dissolved Oxygen, pH, BOD and Total Coliform have been measured in 12 stations selected based on sandstone and aquaculture industries. In this river, there are three sandstone and 4 aquaculture industries that only Salinity and Turbidity were upper of standard value due to agricultural waste while other parameters were placed in the standard range. The result of IRWQI index in each station is 79. 2, 77, 77. 3, 77. 7, 62, 70. 7, 73. 6, 74. 2, 79. 2, 77. 4, 79. 9, 83, respectively that are in good level and is presenting a good purification of this ecosystem, therefore, though the studied industries have effected on water health quality, but, its physical condition such as substrate have moderated the industries’ impacts.

This study aimed to evaluate the effect of photoperiod and different feeding times on growth performance and feed efficiency of juvenile beluga sturgeon (Huso huso) for 56 days. One hundred and twenty fish with an average weight of 51. 5 ± 0. 4 g (mean ± SD) subjected to four different treatments with three replications which distributed in 12 circular concrete tanks under the treatments including: 1) natural photoperiod with feeding under light (Nd), 2) natural photoperiod with feeding under light-day (Nnd), 3) 24h lighting with feeding under light (Ld), and 4) 24h lighting with feeding under light-day (Lnd). Feeding times in natural photoperiod (12L: 12D) were considered at 6, 10, 14 and 17 and 2, 9, 14 and 21 in 24L. At the end of the period, growth performance and feed efficiency were calculated and the results showed no significant Interaction between photoperiod and feeding time among treatments (P>0. 05), but the best performance was observed in Ld treatment. The results of this study represent an increase of 22 g in fish exposed to natural photoperiod with feeding under light and a more favorable FCR over the course of 8-week. Since using 24h lighting with feeding under light, growth performance and feed efficiency of juvenile beluga sturgeon was improved, so it is recommend to using this condition in juvenile beluga sturgeon farms.

The purpose of this study was to investigate the compatibility of rainbow trout fish with biochemical and blood parameters in waters with a salinity range of 0-20 gram per liter order to allow the introduction and development of this species in different aquatic environments with different salinity levels. Baby fish from a cold water factory in Mazandaran province were transported to the Caspian Sea Ecology Institute for testing. fishes with average weight 31. 56 ± 0. 70 g and mean fork length of 13. 87 ± 0. 15 cm, in 3 treatments in water with saline (fresh water, 13 and 20 g / l) With a density of 15fishes in, each 300 liter polyethylene tank containing 250 liters of tested water was introduced. Fresh water water from the Tajan River and 13 grams per liters of water from the Caspian Sea and 20 grams per liters of water from Caspian Sea salt and sea salt water were prepared. Every day, 50 percent of the water tanks were replaced. The duration of the experiment was 7 days. Measurement of measured water parameters during the test period included: Oxygen dissolved in 6 mg / L, pH = 8. 2, nitrite less than 0. 1, nitrate less than 16 mg / l, ammonium 17. 52 mg / l And a temperature of 15. 5 ° C. In the experimental period, mortality were not observed in experimental groups. The results showed that relative osmolarity, sodium, chloride, magnesium, cortisol, calcium, hematocrit, hemoglobin, number of red blood cells and white in saline medium were higher than fresh water (p <0. 05). The results of blood and blood ionisation of blood plasma of trout fish indicate the physiological compatibility of fish species with the changes in salinity and adaptability to provide the possibility of rearing these fish.

The aim of this study was to investigate the effect of dietary Kiwi (Actinidia sp. ) peel powder on growth performance, body composition and digestibility of Common carp (Cyprinus carpio) juvenile. Due to this purpose, five diets including control (without Kiwi peel powder), four diets containing 1, 3, 5 and 7 % Kiwi peel powder were prepared. Common carp juvenile with initial weight of 19. 53± 0. 05 g were randomly distributed in each treatment (3 replicates) into 300 L tanks with 250 L water capacity and fed at satiation with experimental diet for 8 weeks. After the end of experiment, growth indices, survival rate, carcass composition and nutrient digestibility were assessed. The results showed no significant differences of growth performance among treatments (P>0. 05). Carcass composition, protein and lipid digestibility showed no significant differences among treatments (P>0. 05), but the highest amount of dry matter digestibility was observed in 3, 5 and 7 % treatments, and the lowest amount of that was observed in the control (P<0. 05). Overall, using Kiwi peel powder in diet didn’ t have any negative effect on growth indices, carcass composition and digestibility.

In this experiment, the effect of dietary Spirulina platensis on haemato-biochemical and immunity responses of Caspian brown trout (Salmo trutta caspious) juveniles was investigated. For this purpose, diets with five S. Platensis inclusion levels (control 0%, 2 %, 4%, 6% and 8% of diet fish meal) were prepared. Six hundred juveniles with an average initial weight of 11 ± 1. 0 g were assigned to 15 experimental tanks. The experiment lasted for 10 weeks. At the end of the experiment, haemato-biochemical parameters including white blood cell, red blood cell, neutrophils, lymphocytes, haematocrite, hemoglobin, glucose, albumin, total protein, triglyceride, cholesterol, as well as immunity parameters including lysozyme, C3, C4, Immunoglobulin (IgM), ACH50 and respiratory burst activity were assessed. The hematological and immunological factors were improved when fish were fed a high level of S. platensis supplement. S. platensis inclusion also increased activity of Lysozyme C3, C4, IGM and ACH50 and respiratory burst activity and reduced AST and ALT formation. These results indicate that S. platensis supplement is promising for disease prevention in S. trutta caspious juveniles, at an optimum dietary level of 6-8% in diet.