NEW TECHNOLOGIES IN AQUACULTURE DEVELOPMENT (JOURNAL OF FISHERIES)
Year:2017 | Volume:11 | Issue:3 |Papers Count:8

Nonylphenols havecomprehensive usage in plastic, cleaning products, resins and stabilizers in industry and via sewage permeate to aquatic ecosystems. The study demonstrated the effects of the 4-nonylphenolon microsatellites in the prelarvae of the Iranian sturgeon (Acipenser persicus) as biomarkers to investigate their genetic diversity. 480 prelarvae of the Iranian sturgeon in the 4 treatments and 3 replications (two sublethal concentrations 40 and 70 μ g/l of the 4-nonylphenol, control and sham) was applied in the ten days three periods. The experiment was carried out semi-static condition. Evaluation genetic diversity of the prelarvae's Iranian sturgeon for four pairs of the microsatellites markers (AfuG68b, AfuG63, AfuG241 & LS-68) carried out in the above four concentrations. Finally, the minimum number of alleles observed were 2 (AfuG68b) and the maximum number of alleles observed were 4 (AfuG63) in the 70 μ g/l of the 4-nonylphenol. The minimum heterozygocity observed was 0. 733 (AfuG68b) and the maximum hetrozygocity observed was 1(AfuG241). The minimum hetrozygocity expected was 0. 511 (AfuG68b) and the maximum hetrozygocity expected was 0. 644 (AfuG63). At the fourtreatments, the medium hetrozygocity expected &hetrozygocity observed 0. 852 and 0. 583, respectively. The number of effective allels were increased in the 70 μ g/lat the AfuG63 locus than control. Therefore, the genetic diversity was increased in the environmental with 4-nonylphenol compounds.

Nutritional value of cuttle fish (Sepia pharaonis), sand worm (Perinereis nuntica) and edible bivalve meat (Solen brevis), with determination of the amount of fatty acids such as arachidonic acid (20: 4n-6), stearic acid (18: 00), oleic acid (18: 1n-9), palmitic acid, palmitoleic acid (16: 1n-7), eicosapentaenoic acid (20: 5n-3) and docosahexaenoic acid, essential amino acids inclusive arginine, lysine, leucine, isoleusine, threonine, valine, histidine, phenylalanine, methionine, tryptophane and crude protein, crude fat, crude fiber, ash and moisture were done in laboratory. The results showed that, the amount of essential amino acides and nonessential amino acides (in the more causes) in Sepia pharaonis were more than Solen brevis and in Solen brevis more than Perinereis nuntica. Only nonessential amino acides, such as glysine and alanine in Solen brevis were more than Sepia pharaonis. Also in chemical analysis of wet feeds, crude protein percent in cattle fish was 2. 9 times and 2. 2 times more than Solen brevis and Perinereis nuntica, respectively. The crude fat in cattle fish was 2. 1 times and 1. 6 times more than Solen brevis and Perinereis nuntica respectively. Total crude fat of Sepia pharaonis, Perinereis nuntica and Solen brevis determined 7. 92, 5. 90 and 3. 63 percent respectively. Tottaly, the amount of essential fatty acids in Sepia pharaonis and Perinereis nuntica were more than Solen brevis and in Sepia pharaonis and Perinereis nuntica were almost equal.

This study was carried out during the period of breeding and migration of kutum Rutillus Frissi to the Shirud river (Iran), between March to April 2015 and the physico-chemical factors in two different sites (in the catching area of Shirud river and in the sea with about 100 m distance from the river) including water temperature, pH, dissolved oxygen, TDS, EC and salinity and reproductive parameters such as egg weight, fertilization rate, number of eggs per gram and egg diameter were measured. According to Pearson's correlation test, the salinity of sea water and egg's weight had a significant negative correlation (P<0. 05). There was a significant correlation between the salinity of the river with the egg's weight and the fertilization rate. Also there was a significant relationship between EC and TDS parameters of Shirud river with the egg's weight (P<0. 05) and other physico-chemical factors measured in the river and the sea were dependent from reproductive parameters of kutum.

In this study 16 groups of zooplankton belong protozoa, arthropoda, rotifer and cyliophora were investigated. The number of these zooplanktons were accounted in m3 and also their biomass (mg/m3) was measured. The average biomass of zooplankton was measured 531. 74, 30. 77, 225. 07 and 96. 26 mg/m3 respectively and the total was attained 883. 83 mg/m3. The maximum and minimum biomass of all zooplanktons was estimated in November and July, 3446. 23 and 6 mg/m3 respectively. Furthermore, the maximum and minimum numbers of zooplanktons were found in September and July which were 48. 4 and 0. 002 millions respectively and the average number was 8. 4 ind/m3.

This study evaluated and compared the accumulation of Ni in the muscle tissue of fish Cobia (Rachycentron Canadum) and its relation to the total length, total weight and age of the fish in the waters of the Persian Gulf in 2014 was northwest. 96 fish samples were collected at 6 length group. Measuring the level of essential elements samples were digested through wet digestion method and by Perkin Elmer 4100. The difference between the means analysis of variance (ANOVA) and the presence or absence of difference and a significant relationship was estimated at 95%. Mean concentrations Ni in the muscle tissue were Rachycentron Canadum 0. 148± 0. 05 mg/kg dry weight (P<0. 05). The highest concentration of Ni in groups belonging to different lengths of groups larger than 127 cm in length (0. 238± 0. 9 mg/kg dry weight). A positive correlation was established between in the total length and total weight and age and accumulation of Ni at levels significantly (P<0. 05). Concentrations of Ni in muscle of Rachycentron Canadum were lower than international standards WHO (0. 38 mg/kg).

The Sampling was done in 4 transacts in Anzali, Tonekaboun, Noushahr and Amirabad at 3 different depths including 5, 10 and 20 m. Sampling was carried out in four seasons of spring, summer, autumn and winter in 2013. The annual changes of zooplankton was between 392± 113 ind. /m3 in autumn (Amirabad) to 8065± 11735 ind. /m3 in winter (Amirabad). The lowest density of zooplankton in the spring was 2207 ind. /m3 in Anzali. The density of zooplankton in Tonekabon and Amirabad was 2. 0 and 2. 8 fold more than other transects respectively. The results showed that the abundance of zooplankton in summer was between 1964± 470 ind. /m3 (Amirabad) to 5706± 6088 ind. /m3 (Tonekabon). The biomass was 30. 02, 52. 22, 22. 98 and 18. 31 in Anzali, Tonekabon, noshahr and Amirabad respectively. The abundance of zooplankton in the autumn reached the lowest value. The lowest value was 392± 113 ind. /m3 and 3. 71± 0. 91 mg/m3 (Amirabad) and highest value was 2280± 1435 ind. /m3 and 20. 23± 1450 mg/m3 (Anzali). The highest density was observed in Amirabad (8065 ind. /m3) and Anzali (8061 ind. /m3) in winter. The aim of this study was diversity, distribution, density and biomass of zooplankton in the southern of Caspian Sea.

One way of obtain for marine data is direct measurements or ongoing case. Generally data processing is to convert the data into information so that management and applied marine sciences purely on the basis of information occurs. Therefore, any scientific study is necessary to turn data into information. Marine data as basic information for the design of marine structures and coastal and Fisheries and Aquaculture are of vital importance. Optimal design of structures such as breakwaters, docks, oil rigs, pipelines deployed on the seabed, coastal protection systems and naval shore facilities directly depends on the accuracy of the information used. In this study, the analysis of field data and the current wave profile in Bandar Anzali, in June 2003, has been paid. According to this measure the maximum significant wave height of 3. 26 meters and out of the port of Anzali to the prevailing north-east of the waves and the period of 10 seconds. The magnitude of speed dominant current outside of Bandar Anzali 0. 38 m/s and direction is the eastern. For station in mouth of Bandar Anzali significant wave height time series with time-series variation of the current speed is consistent. So currents in this area is mainly due to the wave breaking.

This study was carried out to evaluate the physicochemical parameters on growth performance in Rutilus rutilus caspicus juvenile in ponds of Sijaval cultivation center for releasing them into Gorgan-rud River for restocking of them. Sampling from water was achieved with 1 liter sampler, from zooplankton with planktonic net (mesh size. 3μ ) and from fish juvenile for surveying of feeding, survival and growth performance from April 2014 to June 2014 (every 10 daily). Results showed that the physicochemical condition was suitable. In surveying of juvenile quality situation, pond 3 having higher length and weight growth performance than others. Probably, it is for better feeding situation of juveniles. In conclusion, Sijual center ponds are having suitable condition.