ORIGINAL_ARTICLE
The study of effective Zooplanktons in nutrition of Acipenser stellatus Fingerlings in earthen Ponds
In order to study the growth rate of stellate sturgeon, three earthen ponds with 2 hectares area were selected randomly two ponds were treated with 16 tons organic fertilizer and 40 kg Daphnia. The total culture period considered 35 days. The physical and chemical parameters of and also the density of zooplanktons and benthos were measured during the rearing period. Apart from these factors the gastrosomatic index (GSI), daily growth rate and the condition factor of the fingerlings were also determined in order to assess the output of each pond. On the basis of the statistical analysis conducted, no significant difference was observed in the physical factors of the water in the three ponds but for nitrite values were significant. The major productivity of zooplanktons and benthic organisms were Daphnia (D. magna and D.pulex), cyclops and nauplii of cyclops. The minimum and maximum biomass of zooplanktons and benthic organisms m the ponds treated with fertilizer and live-food were estimated 0.018 and 38.63 g/m3; 00 to 2.1 g/m2, respectively. No significant difference was observed in the productivity of the ponds. On the basis of the abundance of prey in the studied pond, D. magna and D. pulex were the primary prey (FP>50), cyclops and nauplii cyclops were secondary prey (10<FP <50) and Tubificidae and Chironomidae were the occasional preys (FP=0). The results or GSI observations indicated a decrease in daily growth rate and condition factor with an increase in weight and length or the fingerlings, but this difference was not significant, The analysis of gut contents of the 120 fingerlings in the ponds treated with animal fertilizer and live-food indicated that 30 of the fingerlings were reared under good rearing conditions.
https://isfj.areeo.ac.ir/article_115796_3e87802942f37e52a92057c6f1a8fa1e.pdf
2001-06-22
1
14
10.22092/isfj.2001.115796
K.
Hadadi moghadam
1
AUTHOR
M.
Ahmadi
2
AUTHOR
A.
Keyvan
3
AUTHOR
ORIGINAL_ARTICLE
Molecular population study on Penaeus semisulcatus from the Persian Gulf and Oman Sea using Cytochrom Oxidase Subunit I (COI) gene by RFLP method.
The objective of this investigation was molecular population study on Penaeus semisulcatus stocks from the Persian Gulf and Oman Sea. Samples were collected using trawling method from Hormuz (40 individuals) and Bushehr (35 individuals) regions. The DNA of samples were extracted using phenol and chloroform method and then were simplified using a pair premier of Cytochrom Oxidase Subunit I (COI) gene sequence by a thermal cycler. Nine restriction enzyme were Used to digest the larger gene region that five of them (Alu I, Hinf I, Hinc I I, Hpa I I and Rca I) appeared Polymorphic patterns. Reap software and X2 test were used to analyses the RFLP data. The average nucleotide diversity arid haplotype diversity among the population were 0.0345720 ± 0.0011952 and 0.28590±0.08174 and nucleotide divergence among population, being studied, is supposed to be 8.5%. Considering the result dispersion of haplotypes in two region showed a significant difference and this is an evidence for proving the variety of the stocks.
https://isfj.areeo.ac.ir/article_115797_51d8dd09cb048b444b5ca7761140b105.pdf
2001-06-22
15
30
10.22092/isfj.2001.115797
S.
Rezvani
1
AUTHOR
A.
Babaei
2
AUTHOR
M.
Pourkazemi
pourkazemi@sturgeon.ir
3
AUTHOR
ORIGINAL_ARTICLE
The changes in TVN and Histamine of Kilka within the different preservation methods
The purpose of this research was to evaluate the quality of preserved kilka for human consumption. The different preservation methods (CSW and crushed ice) were used and the results were compared with the traditional method. Two main parameters (TVN and Histamine) of collected samples were measured in different preservation-time, namely: a) Time zero (after fishing), b) T5 and T10 (5 and 10 hours duration from fishing ground to processing room). The mean value of Histamine of T10 (10 hours after fishing) for traditional, CSW and crushed ice methods were determined 10.3, 2.2 and 1.5mg/100, respectively. On the other hand, the measured TVN values above mentioned methods were 22.3, 19.0 and 17.0 mg/100, respectively. The results showed a significant difference between the traditional method and two other methods (P<0.05) but (here was no significant between CSW and crushed ice methods. Since, the preserved kilkas in the CSW showed higher quality, therefore, it is proposed that tor using kilka as human consumption, they showed be preferably preserved in chilled sea water after fishing.
https://isfj.areeo.ac.ir/article_115799_aa27b7738a23b72d2bdff57ca6c04958.pdf
2001-06-22
31
40
10.22092/isfj.2001.115799
A.
Salmani
1
AUTHOR
S.
Gholami por
2
AUTHOR
M.
Yosefian
yousefianeco@yahoo.com
3
AUTHOR
ORIGINAL_ARTICLE
Fish Fauna investigation in Arass reservoir and its Iranian tributaries
During two different periods (from 1994 to 1995 and 1997), the identification of fish fauna of Arass reservoir and its Iranian tributaries were carried out seasonally. Different fishing gears, namely: gillnet, beach scine, castnet, electric-shocker were used to catch fishes in 18 stations within 6 regions. Main purposes of this study were: species identification, spatial and temporal distribution and also to determine some ecological and biological Characteristics of fishes. In the present study, 27 species belong to 6 families and 4 orders were identified. From point of species composition, the Cyprinidae family with 77.8 percent was the most abundant and the percentage of species composition for other families were Gobiidae 7.4 % and each or following families namely: Balistidae, Siluridae, Pocciliidae and Pereidae represented by3.7%. The most abundant fishes belonged Percidae family with 37.27% Cyprinidae With 23.64% and Gobiidae with 28.61%. Sander lucioperca and Neogobius kessleri with 37.3% and 27.8% of the total number of fishes were the dominant species among catch composition, and on the other hand the least frequency in number observed for Brbus mursa, Ctenopharyngodon idella, Hypophthalmyichthys molitrix, H. nobilis and Gobio persus with a total frequency of 0.5%. Among the total 27 identified species, 7 species were classified as exotic fishes. I should be mentioned that 8 species are reported for the first time from the studied area.
https://isfj.areeo.ac.ir/article_115800_bd13a43232005ef9bf38b267b46a268e.pdf
2001-06-22
41
62
10.22092/isfj.2001.115800
K.
Abbasi
kayvan_abbasi@yahoo.com
1
AUTHOR
A.
Sarpanah
sarpanah5050@gmail.com
2
AUTHOR
ORIGINAL_ARTICLE
The quantitative changes of Silicon and Diatoms in southern part of Caspian Sea
The purpose or this study was to evaluate the changes of dissolved silicon concentration and biomass of diatoms in southern part of Caspian Sea, 1270 plankton and water samples were collected seasonally from 77 stations for further quantitative and qualitative analysis. The results showed that the minimum and maximum density of dissolved silicon and biomass of diatoms were varied from 0.195 to 0308 ppm and 33 to 179 mg/m3 respectively. As well as the fluctuation of dissolved silicon concentration in different depths of photic zone. It was indicated that the maximum and minimum concentration of this element were found in the eastern area with 0.269 ppm and western area with 0.180 ppm. The most and the least biomass of diatoms were observed in the western and central areas with 180 and 89 mg/m3, respectively. The concentration or silicon in offshore waters was more than coastal waters and on the contrary, the biomass of diatoms from coastal to offshore waters indicated decreasing trend. In a conclusion, the concentration of dissolved silicon and biomass of diatoms could be affected by different physical parameters such as: water circulation, river currents, exchange of biogenic sediments in photic and aphotic zones. Also, there was a significant relationship between the biomass of diatoms and silicon concentration.
https://isfj.areeo.ac.ir/article_115801_523bf8d9e74e5ad10d2c1ca99e0cc633.pdf
2001-06-22
63
76
10.22092/isfj.2001.115801
H.
Nasrolah zadeh saravi
hnsaravi@gmail.com
1
AUTHOR
A.
Makhlogh
asieh_makhlogh@yahoo.com
2
AUTHOR
ORIGINAL_ARTICLE
Estimation of potential yield on demersal fishery resources based on the production of Macrobenthic Fauna in the Chabahar bay
Population density, distribution and biomass of macrobenthic fauna in Chabahar Bay were investigated from May 1995 to Match 1996 on a bimonthly basis. The most abundant groups were Amphipods (21.0%), Polychaetes (19.0%), Gastropods (15.7%) and Bivalves (10.6%). Maximum (13000 individuals/m2) and minimum (4600 individuals/m2) were observed in May and July, respectively. The changes in density were influenced by monsoon season of the Indian Ocean. Spatial and temporal variation in biomass were recorded for all groups separately. The lowest biomass was observed during monsoon period (July-September) with a mean of 51.5g dry wt/m2 and the highest in premonsoon period (March-May) with an average 164.8gr dry wt/m2. Furthermore, the average biomass of total macrofauna in the survey area estimated as 109.3 g dry wt/m2 (corresponding to 481.0 wet wt/m2) Having these figures, the annual production Of Macrobenthic fauna was estimated for the whole studied area. The potential yield of demersal fishery resources (fish and crustacean) was then estimated to be 15390 tons/year. Accordingly the annual exploitable demersal fishery resources for the entire Chabahar Bay was estimated to be 7700 to 8500) tons/year.
https://isfj.areeo.ac.ir/article_115802_26819d145656df627bde1f6fe84e0abb.pdf
2001-06-22
77
102
10.22092/isfj.2001.115802
A.
Nikoeian
1
AUTHOR
ORIGINAL_ARTICLE
Occurance of Flavobacterium psychrophilus-Like infection in Silver carp (Hypophthalmichthys molitrix)
In winter 1994, a mortality up to70% was observed in cultured silver Carp (H. molitrix) in one of the Khouzestan Province fish farms. Bacteriological studies were carried out on the samples obtained from kidney, liver, eroded tails and gills using Cytophaga medium resulted in isolation of filamenus gram negative bacteria. These bacteria were similar to Flavobacterium psychrophilus from point of chemical characteristics. Histological observations showed some necrosis in skin's layers, tissues or livers, kidneys and some sections of gill filaments. Review of present Literature indicate that there is no pervious report on natural occurence of Flavobacrerium psychrophilus infection in silver carp.
https://isfj.areeo.ac.ir/article_115804_2bc369d4f31bf74f5a30d356ee3a59c0.pdf
2001-06-22
103
111
10.22092/isfj.2001.115804
Silver carp
Bacterial infection
psychrophilns
F.
Esmaeili
1
AUTHOR
M.
Soltani
2
AUTHOR
A.
Sayari
3
AUTHOR