JOURNAL OF AQUATIC ANIMALS & FISHERIES
Year:2011 | Volume:2 | Issue:5|Papers Count:8

Studying of corals health (Stag horn coral) of Kish Island, is done in front of Bageh – Parandegan site (54 02 405, 26 03 078 – 54 02 158, 56 03 825) during a period of one year from winter 2007to winter 2008, seasonally. Coral Watch Method (C.W.M) for survey coral health and quadrate for studying opportunist organisms settlement are used for this study in each transect and subtransect. Resulting of coral bleaching is shown that started with 10 percent in spring and continued with 90 percent of D1 Index in winter this phenomenon also 10 percent of coral communities were living. Also settlement of Entromorpha sp. and spate of petriidae families with continuing corals bleaching are observed that estimated 15 and 68 percent for Entromorpha sp. and 865 and 10 per 1 m*m for pteriidae family in summer and winter of 2008, respectively. Parameters of temperature, salinity, turbidity and chlorophyll a by the CTD apparatus were measured in each season. Main results of Principal Components Analysis (PCA) relations with the impacts parameters of temperature, salinity, turbidity and chlorophyll a in the development of a coral bleaching, the effect of temperature components identified more than 81 percent.

In this study, ionic parameters (Na+, K+, Mg+2, and Ca+2) and metabolite factors (cholesterol, total protein, and glucose) of serum and their interrelationships were detected in 48 specimens of Liza klunzingeri captured from Bandar Abbas coastal water(Persian Gulf).Blood sampling was conducted by cutting the caudal peduncle of each sample, and blood was collected into heparinized and sterile capillary glass tubes. Results indicated that values of Na+, Ca+2, K+, and Mg+2 revealed the highest to the lowest content in blood serum of Liza klunzingeri, respectively. Cholesterol concentration was higher than glucose and the latter was estimated more than total protein. Na+ was positively correlated with Mg+2 (P<0.01), whereas it shows reversed correlations with glucose (P<0.01) and pH (P<0.05). Mg+2 had a significant and positive relationship with the ratio of Na+ to K+ and Ca+2 to K+ ratio (P<0.05) while it represented a reverse correlation with pH (P<0.01) and glucose (P<0.05). The correlation between the ratio of Na+ to K+ and Ca+2 to K+ ratio was positive (P<0.01) and Ca+2 concentration correlated positively with total protein (P<0.05).Concerning to the relationships between ionic and metabolite factors on reproductive cycle, acid–alkaline balance, and growth and osmoregulation in Liza klunzingeri, the results deduced in the present trail might improve reproductive and cultivation management of this valuable species.

For identify relation between phytoplankton concentration and environmental factors four station in bandarabbas coastal waters located. In this study 48 genera of phytoplankton related to Diatoms, Dinofllagellates, Blue-green (Cyanophycsae), and Haptophyceae identified that diatoms with 31 genera (%64.59), followed by dinoflagellates with 13 genera (%27.08), blue-green alga with 3 genera (%6.25), and Haptophyceae with 1 genera (%2.08) were dominate phytoplankton community respectively. Dinoflagellates concentration mean was 11016 (Cell/litr) followed by diatoms with 5340 (Cell/lit), cyanophyceae 3070 (Cell/lit) and haptophyceae 391 (Cell/lit) reported. Margalleff biodiversity index for phytoplankton cpmmunity renged between 332 to 2.035 in bandarabbas coastal waters. In this study temperature mean was 27.3 (c), salinity 34.5 (ppt) and nutrient renges were for po4 (231mg/lit), Sio2 (262mg/lit), No2 ((41mg/lit) and No3 (164 mg/lit)reported. Pearson correlation matrix showed a signifficant correlation between nutrient and phytoplankton community (Po4(P</05, r=/661), Sio2 (P</05, r=/585), No2 (P</05, r=/575), No3 (P</05, r=/624)) .We found inverse correlation brtween salinity and phytoplankton concentration (P</05, r=-/737) but between temperature and phytoplankton concentration not found significant correlation (P>/05, r=/118).

Indian Mackerel (Rastrelliger Kanagurta) belongs Scombridae family with high economic value exists in south of Iran. In 2011, A studing did on R. Kanagurata feeding from October 2011 to February 2011 during 6 months in district of coastal waters of Bandar Abbas city. 181 fish investigated as variations range of stomach items in different length groups, vacuity index (CV), stomach fullness index (FI), food preference (FP), gastro somatic index (GSI) And the percent of items observed. The length variations range of R. Kanagurata was between 175 to 285 mm. This fish with a mean relative length of gut (RLG) (1.906±0.272) is zooplankters and the changes of vacuity index is showing voracious this fish. Copepods are preference food with 91.10 percent in stomach contents and Mollusks are second food with 20.9 percent. The gastro somatic index, condition factor and stomach fullness index calculated as monthly and the  Highest amount observed during period studying (0.58) in January, (1121) November (100) Respectively.

In this study some of the ionic composition indices and their relations with the efficiency of reproduction and artificial spermatozoa maturation factors in Kutum Rutilus frisii kutum were measured. For these propose examined the 20 samples that 10 male specimen from the maturation of 3 years, 10 male specimen with 4 years were examined. Results shows that the average and standard deviation of ions properties in fish 3 and 4 years include: 96±5.7 meq/l and 96.6±6.4 for Na, 32±1.6 meq/l and 2.4±34.5 for Potassium, 4.23±1.43 mg/dl, 3.58±1.02 for calcium, 2.25±0.62 meq/l and 0.47±2.27 for Magnesium, 100.1±7.95 meq/l and 107.3±7.68 for Cl were investigated respectively. According to the results relation between potassium and chloride ions with fertilization rate and hatching percentage were significantly positive and the direct relationship of sodium, magnesium and calcium with fertilization rate and hatching percent were significantly negative.

This study was carried out to survey of omega -3 fatty acid distribution in six natural and cultural shrimp species, Fenneropenaeus merguiensis, Penaus semisulcatus, Fenneropenaeus indicus, Metapenaeus affinis, Parapenaeopsis stylifera and Litopenaeus vannamei. Oil extracts were done according Bligh and Dyer, 1959 and by gas chromatography, HP-6820. Results showed the important fatty acids in samples were EPA (C20:5n3), DHA (C22:6n3) and ETE (C20:3n3). C16:0 was the important of SFA and C18:1n9 was the important of MUFA. Also results showed amount of omega-3 was more than omega-6 in the samples. The more amounts of PUFA/ SFA was 1.04 mg/g in Metapenaeus affinis, while that was less in Penaus semisulcatu (0.86 mg/g), altogether the more of fatty acids was in Litopenaeus vannamei.

This study was carried out for the preparation of chromosomal expansion of freshwater Shrimp (Caridina fossarum) from its egg and larvae stages. It is used immersion method rather than injecting one due to the small size of the shrimp. This study was proceeded up to the observation of cells, broken cells and eventually chromatids. The case of working with the cells of egg, the cell was not observed because it can be hard chitin membranes around eggs, sudden mortality of eggs cell in stage of the immersion.

This experiment was aimed to determine the effect of Lactobacillus bacteria as probiotic on resistance of white shrimp (litopenaeus vannamei) larvae against stress tests in The Persian Gulf and Oman Sea Ecology Research center. In this study the white shrimp larvae were feed on 6 times a day from mysis1 to post-larvae5 stages by 2 experiment treatments named A (with enriched rotifer by probiotic) and B (with enriched rotifer by probiotic & probiotic powder dissolved in water) and control or C with three replicates in 20-L plastic tanks containing 10-L of seawater with 50 larvae per liter. At the end of period (after 8 days) the shrimp larvae were tested by salinity (10 & 45 ppt) and formalin (100ppm) stress. The result indicated that the used probiotic bacteria had positive and significant effects on resistance of shrimp (P<0.05) the survival rate and resistance against salinity and formalin stress of containing pribiotic treatments (A&B) were significantly higher than control (P<0.05). The highest survival and resistance were founded in B treatment but it had no significant difference with A (P>0.05). This study showed that using of probiotic has good effect on survival rate and resistance of white shrimp larvae.