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  • 1
    Publication Date: 2018-09-26
    Description: According to achieve sustainable production in shrimp farming industry, it is necessary to provide the relief of producers through insurance. Aquaculture faces various environmental conditions such as unpredictable climate changes, epidemic diseases, harsh water factors, that may affect the production cycle, and impact on producer's life. In this research, the effects of various factors on production of cultured shrimp have been studied. The project conducted through completion of questionaries by random selected of small scale farms, and all large farms which engaged in production in that years. In order to increase the accuracy of responses, special questionnaires provided to fill in by expertise experts. All data explained the share of management and natural factors on production process.
    Keywords: Aquaculture
    Repository Name: Aquatic Commons
    Type: Monograph or Serial Issue , NonPeerReviewed
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  • 2
    Publication Date: 2018-10-13
    Description: Species diversity of aquaculture based on introduction of endemic and exotic species, for various object to aquaculture industry. AS FAO reports in 2012, about 558 different aquatic species have been used for aquaculture production. Among these, 130 marine fishes, 169 fresh water fishes, 45 species of migratory fishes, 62 crustacean, 35 aquatic plants, 4 aquatic products (pearl,), 98 invertebrates and finally 15 other aquatics included. Increasing of world aquaculture production depended on species diversity, and exotic species play the highest rank in this field. Aquaculture development program in Iran emphasized special attention on species diversity since last half century. Wide studies and researches devoted on biology, and exotic species. Iran aquaculture industry studied 27 different exotic species, and 28 endemic species for aquaculture development and sea ranching program. In addition, about 250 different ornamental aquatics, mainly non- native included in house- aquariums. Six different exotic species have the main aquaculture production in cold water, warm water and sea water environments. Rainbow trout is the main species in cold- water, while high valued endemic species of Caspian salmon has not any role in aqua culture production. In warm water fish group, chines carps and common carp are main species, but endemic species same as shirbot, Gattan, Benny and Schizotrox have not used in aquaculture production. Despite of wide researches on marine fishes of north and south sea, not endemic fishes included in aquaculture production. The new developing production of marine fish relied on non- native fish. Although specific duration of shrimp culture based on endemic species of Penaeus indicus, it is about of 10 years that shrimp production relied on exotic species of P.vannamei. In case of sturgeon fish, this new enterprise based on endemic species of Huso huso. Finally, the aquaculture industry of Iran same as most other countries relies on exotic species.
    Keywords: Aquaculture ; Management
    Repository Name: Aquatic Commons
    Type: Monograph or Serial Issue , NonPeerReviewed
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  • 3
    Publication Date: 2016-10-12
    Description: Study of batch profile evolution and scouring effect due to the wave and current impacts in the coastal zone has been one of the most important issues in coastal engineering research projects during the past decades .to construct the coastal protective structures such piers, breakwaters and seawalls, it is necessary to estimate the scouring depth and bed level changes in the vicinity of such structures. Furthermore, the time - dependent changes in the equilibrium profile of the surf zone can be of great importance in designing coastal structures. Because of the importance of coastal engineering study in Iran due to the existence of two important coastal area located in the north and south parts of the country, and due to the lack of classified data in this respect (particularly the effect of sea level rise on coastal morphology) in the present study, based on the available data of Bandar Anzali region, an analysis of the coastal zone behavior is made. Bed level elevations are measured and compared with the theoretical equilibrium profile. It is shown that the behavior of the coastal zone in the region is consistent with the dean (equilibrium profile . In the next stage, following extensive investigations, the bed level changes due to a rise in sea level at different locations in the surf zone are estimated. Finally based on the results obtained for profile evolution due to sea level rise, the conclusion is made for design of coastal structures located in the study area. The results obtained from the present study indicate that the sea level rise can have a significant effect on beach profile and resulting erosion in the study area. The results are graphically presented with can be used for design purposes and establishing a data base for the coastal zone in the study region. It is believed that the present work can be regarded as a contribution to the existing knowledge of coast process in the study area and referred to as a basis for the future coastal research projects.
    Keywords: Environment ; Oceanography
    Repository Name: Aquatic Commons
    Type: Thesis , NonPeerReviewed
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  • 4
    Publication Date: 2018-01-15
    Description: In this study Astacus leptodactylus were tested for 8 week with three practical diets containing three crude protein (30, 35 and 40%) and isoenergetic level (370kcal/100 g) in fresh water and brackish water of Caspian Sea. In this test, 6 treatments were used with three replicates in 18 fiberglass tank (110 liter). Each tank had 5 narrow clawed Cray fish (mean (±SD) individual weight=17±2.3g) and totally 90 clawed Cray fish were stocking. Result indicates mean weight of Cray fish in fresh water and brackish water were 14.82 and 12.73, respectively, that were significantly different. The highest survival occurred in interaction between protein (30%) and salinity (0) (95.55%) and lowest survival occurred in protein 40 – salinity (12) that were significantly different. The highest specific growth rate (SGR), weight gain (WG), Protein Efficiency Ratio (PER), Net Protein Utilization (NPU) and lowest Feed Conversion Ratio (FCR), demonstrated that dietary (protein 30% and fresh water) which had no significantly differences. Result of this study showed that the highest protein of body composition were in practical diet containing 30% protein and 0 salinity (freshwater) that were significantly different with other treatment.
    Keywords: Aquaculture ; Biology
    Repository Name: Aquatic Commons
    Type: Article , PeerReviewed
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  • 5
    Publication Date: 2018-04-05
    Description: Sampling was done using 90 post larvae which were produced by reproduction of some broodstocks of Fenneropenaeus indicus in one day and reared in the same situation for 4 months. Samples were divided into 3 groups: high, medium and low growth (based on weight and length). Genomic DNA was extracted from muscle tissue using the phenol-chloroform method. The polymerase chain reaction (PCR) was carried out using 21 RAPD loci and PCR products were separated on 3% Agarose gel. From 21 loci studied, 12 produced polymorphic bands. The most polymorphic produced bands using OPAQ 9 and the least by OPAQ 7. Search for specific markers in F. indicus one specific band was observed in the low growth group using OPAQ4. The highest genetic distance (0.457) was between the low growth group and the medium and the lowest (0.091) between high growth and medium groups, therefore the highest genetic identity (0.912) was between high growth and medium groups and the lowest (0.633) between low growth group and the medium. Neighbor-joining resulted in two groups, the first including high and medium growth groups and the second low growth group. It appears that low growth group depended on separated population. Considering the mean weight of F1 (mean weight of 90 specimens) (16.25±1.5 g), parental generation mean weight of 15 ±1.2 and mean weight of parent 31.6 g, response to selection (R) and heritability for growth in this species were estimated to be 1.2±0.2 and 0.07±0.01 respectively.
    Keywords: Biology ; Fisheries
    Repository Name: Aquatic Commons
    Type: Article , PeerReviewed
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  • 6
    Publication Date: 2018-05-01
    Description: The present study was carried out in order to establish an economical effective diet for the Pacific white shrimp in the southern part conditions of Iran. Three dietary energy levels (E1=262, E2=312, E3=362 Kcal 100 g^-1 diet) and 6 ratios of fish meal (FM): soybean meal (SBM) [(P1= 100% FM+ 0% SBM), (P2= 80% FM+ 20% SBM), (P3= 60% FM+ 40% SBM), (P4= 40% FM+ 60% SBM), (P5= 20% FM+ 80% SBM), (P6= 0% FM+ 100% SBM)], 18 experimental diets were prepared. Completely randomized design was used to assign 54 polyethylene 300 litre round tanks provided by aeration and was stocked by 19 juvenile shrimp as 3 replicates to each treatment. Shrimps average weight was about 0.77 g at the start. After 56 days culture period, maximum growth and nutritional performance were observed in the P6E1 and P5E1 treatments. In addition, the highest survival rate of the shrimps was observed in the P1E1, P1E2, P3E3 and P5E3 treatments. Results indicated that protein, fat, fiber and ash contents of carcase were significantly affected by the treatments (P〈0.05). Results of the present study suggest the replacement possibility of at least 80% of dietary fishmeal by soybean meal in the diet of Pacific white shrimp in the conditions of southern part of Iran.
    Keywords: Aquaculture ; Fisheries
    Repository Name: Aquatic Commons
    Type: Article , PeerReviewed
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  • 7
    Publication Date: 2018-07-17
    Description: The white leg shrimp (Litopenaeus vannamei) was introduced to Iran in 2005 by Iranian Fisheries Research Organization. In this study which was carried out at the Iran Shrimp Research Center in Bushehr, shrimp growth in three density treatments 50, 100 and 150 PCs/m super(3) with three replications were compared. The experiment was conducted for 50 days in fiberglass tanks (three ton capacity). Daily tests of salinity, pH, temperature and dissolved oxygen were also carried out. We found that the mean salinity, pH, temperature and dissolved oxygen were 30.2 ppt, 7.9, 25.5 degrees centigrade and 6.2mg/l respectively. We recorded a mean weight of 2.96, 2.17 and 1.87 grams for shrimps in 50, 100 and 150 PCs/m ^(3) respectively.
    Keywords: Aquaculture
    Repository Name: Aquatic Commons
    Type: Article , PeerReviewed
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  • 8
    Publication Date: 2018-07-20
    Description: This study was conducted in the Shrimp Research Center of Bushehr in winter 2005. We treated reared White Leg Shrimp (Litopenaeus vannamei Boone 1931) with five diets containing 20%, 25% ,30%, 35% and 40% protein levels and three salinity levels 15-17ppt, 27-30ppt, and 40-45ppt. We focused on growth, survival, food conversion ratio, hemolymph osmolality, hemolymph protein and corpse protein content. We applied 15 treatments each with three replicates in 45 tanks with 300 liter capacity. Shrimps average weight was about 2 grams at the start and reared after 60 days of culture. Shrimp biomass growth in 15-17 salinity was higher than other salinities showing statistically significant difference with those grew in 40-45ppt salinity (P〉0.05). No statistically significant difference was found between growth of the shrimp in 15-17ppt and in 27-30ppt water.
    Keywords: Aquaculture
    Repository Name: Aquatic Commons
    Type: Article , PeerReviewed
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  • 9
    Publication Date: 2018-07-20
    Description: The probiotic effects of Bacillus spp. bacteria on the growth and survival rate of Litopenaeus vannamei in 30 and 40 g, salinities was investigated. We conducted the experiment in Bandargah Research Station, Bushehr province during 45 days. Four treatments with three replicates, and two controls were used and probiotic powder, dissolved in water along with the growth stage pellet was applied in 3O ppt and 4O ppt salinities. The control treatments were only fed by the growth stage pellet in 3O ppt and 4O ppt salinities. The results revealed that growth and survival rate of treatment groups in 3O ppt salinity exposed to the probiotic powder were higher than those of the controls without increasing probiotic powder (P〈0.05). Although the growth rate of treatment groups in 4O ppt salinity was higher than those of the control without increasing probiotic powder in 4O ppt salinity, but there was no significant difference between the two (P〉0.05). Survival rate of the treatment groups in 4O ppt salinity was significantly higher than those of the control (P〈0.05). Also, the results indicated that growth and survival factors of the treatment groups in 3O ppt salinity in comparison with those of the control in 4O ppt salinity were significantly higher. We conclude that addition of Bacillus spp. bacteria to 3O ppt salinity together with application of growth stage pellets to white shrimp, Litopenaeus vannaiiiei, could be very useful in comparison with 4O ppt salinity. The results of this study were obtained through ANOVA and LSD tests.
    Keywords: Aquaculture ; Health
    Repository Name: Aquatic Commons
    Type: Article , PeerReviewed
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  • 10
    Publication Date: 2018-07-20
    Description: To introduce Litopenaeus vannamei to Iran as a cultured shrimp species, a experimental study was carried out to assess the effects of different stocking densities on growth rate, mean weight, survival rate, food conversion ratio and the total harvest of L. vannamei. Mee post-larval groups (P1,12) of L. vannamei (pond A: 20 PL/m2, pond B: 30 PL/m2 and pond C: 50 PL/m2) with average size 0.9cm and initial mean weight 0.01±0.005g were used in this study. The experiments were carried out in three replications in 9 earthen ponds each half a hectare in size in Khouzestan province, south of Iran during 110 days. The result showed there was no significant correlation (P〉0.05) between stocking density and survival rate in the semi intensive culture condition. Mean survival rate among farms were greatest at the lowest density, where mean survival in pond A, B, and C was 88.6%, 83.3%, 73.3%, respectively but the differences were not significant (P〉0.05). The results also showed there was no significant relationship (P〉0.05) between growth rate and growth days in each experiment. The mean growth rate/days for ponds A, B, and C were calculated at 0.16g/day, 0.16g/day and 0.15g/day, respectively. The food conversion ratio in the end of the study period for ponds A, B and C was 1.01, 1.17 and 1.2, respectively. Shrimp production increased with an increase in stocking density when farm production at Pond A and B indicated a significant difference (P〈0.05) compared to that of the pond C. The total shrimp production for ponds A, B and C was calculated at 2803kg/ha, 3146kg/ha and 3972kg/ha, respectively. The water temperature ranged between 28±3°C to 23±3°C, with the highest in July and lowest in September. Salinity ranged between 25±2ppt to 12±3ppt, pH ranged between 8.6±0.2 to 7.50.4 and dissolved oxygen ranged between 5.8± 0.4ppm to 5.3±0.3ppm throughout the study. The study proved that L. vannamei could adapt to common conditions in Iranian shrimp culture environment and also we showed that the species production was higher than the native species already under culture.
    Keywords: Biology
    Repository Name: Aquatic Commons
    Type: Article , PeerReviewed
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