Journal of Aquaculture Development
Year:2014 | Volume:8 | Issue:1|Papers Count:8

The study of macrozoobenthic and physico-chemical factors of water was done during June to October 2010 in three farms of Shife site in Boushehr province. The physicochemical factor such as water temperature, oxygen dissolved, salinity, pH, total phosphate, nitrate, nitrite and NH3 were measured. Sediment by using in order to identify benthos of grab with 250 cm2 covering area sampled and transferred to the shrimp laboratory of Boushehr province. The result showed that identified macrobentoze included three main types: gastropoda, bivalves, polycheata. In addition the average of physicochemical factors such as pH, salinity, temperature, oxygen dissolved was reported. The average of factors such as Nitrate, Nitrite and NH3, total phosphate also were measured. The correlation between oxygen and mean weight and size was negative and significant (P<0.05). Multifactorial analysis between qualitative factors of water showed the negative correlation between Phosphates, whereas nitrite showed negative correlation with mean weight and size of shrimp. The result showed the Shife site has the poverty of Macrobenthose population.

This study was conducted to evaluate the effects of dietary supplementation of alanine on growth performance, nutrition and survival rates in Persian sturgeon (Acipenser persicus) fingerlings under identical rearing conditions. The experiment was performed in a completely randomized design. A total of 600 A.persicus fingerlings with an average weight of 1.5±0.4 g (mean±SD) and an average total length of 6.1±1.9 (mean±SD) cm were randomly allocated to fifteen 50-L aerated tanks (40 fish in each tank) with flow rate of about 0.2 l/min. Fish were fed one of the five experimental diets supplemented with 0 (as a control diet), 1, 2 and 3% of alanine for 45 days. Each diet was randomly assigned to triplicate groups of fish. The fifth experimental diets was balanced with (1 plant: 1 animal) protein sources and then was formulated with 3% of alanine. The results obtained from this study revealed that there were no significant differences in survival rates among treatments. Maximum weight gain (5.9±1.2 g), body weight increase (1380±288 %) and specific growth rate (5.4±0.4 %) were recorded in fish fed supplemented with 3% of alanine. Fish fed diets supplemented with 3% of alanine showed significant differences in weight gain, body weight increase (BWI %) and specific growth rate (SGR) when compared with fish fed control diet, diets supplemented with 1% of alanine and also plant/animal protein-based diet (1: 1). The results of this study indicated that alanine is essential to improve growth performance and nutrition in A.persicus fingerlings.

This research has conducted to evaluate the effect of L-lysine complement on Common Carp (Cyprinus carpio) as a food attractant during 8 weeks on summer of 2012 in Aquacultural Education and Research Center (AERC). 204 individuals of Common carp by the weight of 18.12±3 g and density of 17/tank fed in fiberglass tanks. Four treatments of different levels of l-lysin including 0 (control), 0.5, 1 and 1.5 percent added to diet. At the final growth and feeding indices including final weight, food conversion ratio, specific growth rate, survival rate and body composition. According to the results of this study significance difference observed in growth parameters (p<0.05). In some feeding parameters including daily feed intake (daily percentage) and FCR significant difference observed among treatments (p<0.05). There was no significant difference in survival rate (p>0.05). There was significant difference in protein, fat and ash of all treatment carcasses (p<0.05). Treatment of 1% contained the highest protein (p<0.05). Totally considering no significant differences in most parameters l-lysine is not recommended to improve the growth and surviving juvenile common carp.

In this study effect of water soluble fraction of crude oil on catalase and super oxide dismutase enzymes concentration in juvenile beluga (Huso huso) weighting 10.76±0.23 g was assessed. Firstly, the 96LC50 value of water soluble fraction of crude oil was calculated and then the control group and 3 treatments were choosed in lower concentrations (0.4 LC50, 0.6 LC50, 0.8 LC50) than the 96LC50. Each experimental group had 3 replicates. During the experiments physical and chemical factors of water were measured and in each 24h the liver were sampled and enzymes concentrations were calculated. As the result, the catalase enzyme concentration showed different signification between all treatments and control. Even in fourth day significant difference between all treatments and increase of this enzyme was observed (p<0.05). The 0.4 LC50 treatment in first time of sampling (24h) was the only exception and didn’t show any significant difference with control (p>0.05). The super oxide dismutase enzyme concentration in fourth day showed significant difference between all treatments with control (p<0.05). In all experimental days maximum average of super oxide dismutase enzyme was observed in 0.8 LC50 treatment. However as the results of regression test there were no correlation between the oil pollution dosage and the enzymes concentration changes, neither the enzymes with themselves.

Main purpose of this research was to study the effects of LHRH-A3 hormone on semi artificial reproduction indices and compared that with LHRH-A2 hormone in Hypophthalmichthys molitrix. For this purpose, were separated in 3 treatment of female and were injected with hormone containing 3.75, 5 and 6.25mg/kg respectively. Per treatment consists of 5female with 1repeatation were studied. For male stockes just used doze of 2.5mg/kg. Also another group with similar condition, asprone control group were injected LHRH-A2 hormone. Results indicated that using of LHRH-A3 hormone, can be induce sexually maturation in Hypophthalmichthys molitrix stocks and releasing of egg and milt of those injected with hormone. The best of doze for sexually maturationwas abserved on 5mg/kg. This hormones have similar effects with LHRH-A2 hormone and No meaningful statistical differences was observed in any of the factors (amount of stocking, fertilization percentage, hatching percentage and survival larva percent until frysac absorb) (P<0.05). Paying attention to the obtained results, indicate that using Doze of 3.75 microgram of LHRH-A2 or LHRH-A3 hormone induce decrease in releasing egg.

In order to prioritize the benefits and limitations of integrated rice-fish farming a descriptive study was conducted in 2012 in the Guilan province. In this study, target population was formed from Fisheries Department and Agricultural Organization (Jihad-e-Keshavarzi) experts. The sample size in this study was consisted of 110 experts (55 experts from the Fisheries Department and 55 experts from the Agriculture Department of Guilan Province). The analysis and prioritization was performed by screening method of triangular fuzzy numbers. Results showed that most important of integrated rice-fish farming benefits in Guilan province were more accessible of villagers to white meat through the production of fish, optimal and dual use of rice fields, pollution reduction and environmental sustainability by reducing the use of pesticides and chemical fertilizers, fish production as an additional product and increase revenue rice farmers, dual use from water irrigation resources, increase soil fertility of rice field by fish farming, biological control of weeds and pests. Also, results showed that limitations of rice-fish farming were lack of extension professionals in rural areas, economic problems and lack of adequate facilities, lack of knowledge and expertise, lack of insurance, animals hunter, shortage of anoxia in rice fields, mortality of fish in rice fields and dehydration problems and poor water quality.

The Golabar dam reservoir has been established in order to agriculture activity with geographic position 48o 19' E and 36o 19' N in Zanjan province that can be used for aquaculture purposes. This study was conducted on benthic invertebrate within every 50 days periods during 2009-2010. The samples were taken in 4 stations by van veen grab 20×20 cm and 3 replicates. The results showed the dominance of Chironomidae and Tubificidae families so far the most frequencies were 910 and 770 ind./m2 for them respectively. The average biomass of benthos was 1.44±0.97 g/m2. The fisheries potential production was estimated 2.9 kg/ha for benthovorous fishes. The P/B coefficient value was estimated about 21.5 according to regional climatology that consequently able to provide about 15.5 kg/ha fish production. In conclusion, according to environmental parameters and hydrological regimes also the hydro-chemical characteristics, the aquaculture activity may be planed specially for a short time, limited for maximum of 4 months.

Fish are more important for man kinds as a source of proteins and different vitamins. Some trace elements are necessary for metabolite of human body. If concentration of these traces elements were reached high being toxic for human tissue. Cyprinus Carpio is a commercial fish (third level of fish catch) in the southern of Caspian Sea; therefore, this study was conducted to determine six heavy metals (Fe, Zn, Cu, Ni, Co and Mn) concentrations in edible fish tissue of Cyprinus Carpioin 2012-2013. Forty five samples of fish (Cyprinus Carpio) were collected during winter and spring. All samples were prepared by digesting and extracting processes and then determined using Atomic Absorption Spectroscopy (AAS) instrument. Results of current study showed that mean contents and standard error (±SE) of essential (Fe, Zn, Cu) and semiessential (Ni, Co, Mn) trace element were registered 77.91 (±11), 63.45 (±14.00), 12.11 (±2.00) and 121 (±14), 323 (±28), 3.29 (±0.54) mg/g.dw, respectively. Metals concentrations in edible fish tissue were found in the following order: Fe>Zn>Cu>Mn>Co>Ni. In conclusion, the results revealed that a comparison with tissue quality guideline quotient (WHO) indicated that essential and semi-essential trace elements were not ecotoxicological threats.