ORIGINAL_ARTICLE
Some aspects of reproduction biology of white Cheek Shark (Carcharhinus dussumieri) in Hormozgan Waters (Oman Sea)
During one year period, 603 specimens of white cheek shark (Carcharhinus dussumieri) were examined monthly. Results indicated that, sex ratio is 1:1.13 (Male To female). Maturity occured along with increase in ovary and testis weight, increasing ova diameter, uterine width, and also increase in clasper length and its calcification. Size at first maturity of males was (Total Length). Size at 50% maturity (LM50) was 690mm in males and 680mm in females (T.L). This shark has placental attachment and an umbilical cord. Number of embryos ranged from 1 to 5 and mainly were 2. Maximum length of male and female embryos were 380 and 385 mm (T.L) respectively. Pubs had umbilical scars which remains for some times. Lengths ranged from 345-490 and 350-425 mm (T.L) for males, and females respectively. Sexual reproduction continue throughout the year, with a pick of mating in spring and a distinct pregnancy period from October to April and a pick of parturition in June to July.
https://isfj.areeo.ac.ir/article_115672_033d0484c9fc1c9429031739872ce85e.pdf
2001-04-21
1
18
10.22092/isfj.2001.115672
Carcharkinus• dusstonieri
Reproduction
Hcrmmgan
Tran
H.
Asadi
assadyh@gmail.com
1
AUTHOR
ORIGINAL_ARTICLE
Aquatic insects as indicators of water organic pollution
Aquatic insects as bioindicators and in order to determine water quality in relation to organic matters were used to evaluate the water quality of Fars Province streams and two drainages. Eighteen springs that were presumed to be undisturbed by human activities and two others, disturbed by human activities were chosen to show the effects of the pollutions. Insects fauna or each stream were sampled seasonally in a year period by D. framed aquatic net. Each species (with index value) was used for calculating the biotic index pollutants of these water resources. Water quality determined for 18 springs and two drainages, Based on these values. Chel Cheshmeh, Salavat, Shirin and streams had excellent water qualities (no organic pollution). Paeen, Tang-e-Bostanak and Kamfirooz had good water quality with possible slight organic pollution. Kavar and Barm-e-delak streams had fair water quality (significant organic pollution) and two drainages had poor water qualities (very significant and sever organic pollution). To compare the results, some physical and chemical parameters of water were measured.
https://isfj.areeo.ac.ir/article_115673_354db5bfd1fd10062cf8d2585990f70d.pdf
2001-04-21
19
36
10.22092/isfj.2001.115673
Aquatic insects
Fars province
Iran
M.
Hafezieh
jhafezieh@yahoo.com
1
AUTHOR
ORIGINAL_ARTICLE
Some aspect of reproductive biology of Sillago sihama in Persian Gulf
This study was carried out to evaluate some biological reproductive aspects of Sillago sihama, a valuable gonochoristic species living in coastal areas of the Persian Gulf, from August 1997 to September 1998. Forty fish were caught each month, and their total length, standard length and total weight were measured. Fish were then diseeted and liver, stomach and gonads were weighted. A piece of gonad samples 01 different stages of maturity were taken and placed in bouins fixative. Minimum and maximum fish length were and 23.5 centimeters respectively. Length-weight relationship showed isometric growth in this species. Gonadosomatic index (GSI), gastrosomatic index (GI) and hepatosomatie index (HSI) were also measured. GSI was averaged 4.5 in March for females and 1.50 in April for males. Histological evidence showed that this fish has an ovary with free riped ova at the same time and spawn once a year in spring (synchronos). Sex ratio was measured (1 M:1.2F)(α=0.05,df=1, X2=5), Size of maturity were 11.4 and 12.6cm for males and females respectively.
https://isfj.areeo.ac.ir/article_115674_8b0fdf1033fac616f4089786b4c5c982.pdf
2001-04-21
37
54
10.22092/isfj.2001.115674
H.
Hossein zadeh
h_hosseinzadeh@yahoo.com
1
AUTHOR
M.
Soltani
2
AUTHOR
F.
Dadvar
3
AUTHOR
ORIGINAL_ARTICLE
Biological study on Gorganrood River
Biological study on Gorganrood River was performed from November 1990 until October 1991. Fourteen sampling Stations along the 200km distance from Chai Qushan to estuary. Fish distribution was not similar in all parts and was more dense in lower parts. Density Of common carp, roach and white fish were more considerable particularly in spawning season. Density of benthic organism was very low and blood worms (Chironomidae) and shells of dead mollusca were obtained. Frequency of phytoplankton maximum in September and minimum in January. Bacilliarophyceae, Chlorophyceae and Mynophyceae had more biomass during studying period. Zooplankton had maximum biomass in September and minimum in February and March. Among zooplankton, Protozoa and Rotatoria had maximum biomass.
https://isfj.areeo.ac.ir/article_115675_2e18eeddfc2dce4a5a6b7342fe20d2d3.pdf
2001-04-21
55
72
10.22092/isfj.2001.115675
Biological
Gorganrood
Mazandaran
Iren
Y.
Olomi
uosef_oloomi@yahoo.com
1
AUTHOR
ORIGINAL_ARTICLE
The reproductive study of Golden Snapper (Lutjanus johnii) in Hormozgan waters
Golden snapper is a species of family LUTJANIDAE which is distributed in Hormozgan waters. Biological (especially reproductive) study of each species is necessary both for the cultivation and stock assessment of that species. 613 specimens were sampled monthly from May 1996 to July 1997 in Hormozgan waters, for determining some reproductive factors such as Lm50, spawning season, fecundity and ratio. Spawning season was determined based on GSI from April 10 July with a pick in August. Length of fish in which half of females were matured (Lm50) was obtained at length of 44cm. Fecundity range was calculated in each month. Maximum fecundity was 2539592 in July. This fish is a total spawner species. Sex ratio was 1.23 female to 1 male. Chi square test was applied to compare female and male frequency, and did not show a significant difference (p=0.012) yearly.
https://isfj.areeo.ac.ir/article_115676_c03161ab65802c25edfa9a3507053b95.pdf
2001-04-21
73
90
10.22092/isfj.2001.115676
Lutjnaus johni
Reproductive
Hormozgan
Iran
I.
Kamali
kamalyeassa@yahoo.com
1
AUTHOR
ORIGINAL_ARTICLE
Determination of the oil pollution rate in southern Caspian Sea (from Tonekabon to Bandar Torkaman)
This research was conducted to evaluate total petroleum hydrocarbon (TPH) in the sea water of Mazandaran and Golestan provinces situated in the southern part of the Caspian Sea, during fall 1996 to winter 1997. 330 water samples were collected from the depths of less than 5 meters and 10 meters in seven selected stations. Total petroleum hydrocarbon (TPH) was determined using IR instrument according to ASTM (1995), ROPME (1989) and Russian standard method (1992). As a result, the minimum and maximum TPH of water were 0.11-0.63 and 0.11-2.9 mg/l, in less than 5m depth and 0.078-0.627 and 0.083-0.648 mg/l, in meters depth respectively. The statistical analysis indicated that there was a significant ion between stations and seasons (P<0.001), but there was not any significant difference between the less than 5m and 10m depths (12<0.346). As a conclusion, this region was round to have very low oil pollution comparing to Baku region in Azarbayjan, but higher than the Mediterranean region concerning the fact that no sign of oil activities were observed in this area. Therefore, southern part of Caspian Sea has the lower pollution rate because of the low industrial sewages from coastal rivers and oil platforms.
https://isfj.areeo.ac.ir/article_115677_e5b9d8eb52ae98351b55a05ff350406f.pdf
2001-04-21
91
102
10.22092/isfj.2001.115677
oil pollution. Bandar •Iirkarnan
Caspian Sea
Iran
H.
Nasrolah zadeh saravi
1
AUTHOR
ORIGINAL_ARTICLE
Study on quantity and quality of released Sturgeon Larvae into the Mazandaran and Golestan Provinces Rivers in 1999
Artificial propagation of different kinds of commercial fish of the Caspian Sea, such as sturgeon fishes (specially Persian acetras Acipenser persicus Borodin, 1897) has been recover the stocks in the sea as the natural spawning places in the river has been destroyed in this area. At the present research the number and the quality of fingerlings during the release wad studied. 12361001 pieces of fingerlings 3315846, 7803455 and 1148700 in three center, Rajaei, Sad-e-voshemgir and Marjani respectively) were released in the rivers of Mazandaran and Golestan province. That consist of 87.7, 6.6, 3.3 and 2.4% of A. persicus, A. guldenstaedtii (Brandt, 1833) Huso huso (Linnaeus, 1758) and A. nudiventris (Iovetsky, 1826) respectively. The most important river were Gorgan-rood, Tajan, Larim and Goharbaran (8659377, 1453410, 1211875 and 743561 number, respectively). The average Of weight of above mentioned fish were also 2.55, 4.12, 3.40 and 3.09 gr, as well as 67.2, 40, 34.9 and 47.7% had less than 3 gr weight respectively. These fingerlings were reared in 205 hectare (65.5 he in Rajaei center and 139.5 he in Golestan province). In Rajaei center there was not only any sign or microbial contamination; Diplostumum and Dactylogyrous parasites but 36.7% of fingerlings of A. persicus was combinated to Tericodin.
https://isfj.areeo.ac.ir/article_115678_c8490b95dfde33e8fba5ddd70a3315ea.pdf
2001-04-21
103
110
10.22092/isfj.2001.115678
Sturgeon
released Mazandaran province
Gulestan province
Iran
H.
Fazli
hn_fazli@yahoo.com
1
AUTHOR