موسسه تحقیقات علوم شیلاتی کشورمجله علمی شیلات ایران1026-13543419941122Relationship between the disturbing organisms and the depth of the pearl shells field in the northeast of the Persian Gulfارتباط بین موجودات مزاحم و عمق مزرعه صدفهای مرواریدساز در قست شمال شرقی خلیج فارس31211391610.22092/isfj.1994.113916FAفریبرز احتشامیبندرلنگهJournal Article19941218<br />Fouling is a major problem in culture practices throughout the world. Fouling was investigated in depths of 1,3 and 5 meters.The constituents of foulings are found to vary in different months . Barnacles were major fouling organisms on all three depths throughout the study. Surface panels had mor<br />e density and variation of fouling. Settelment of biofouling is prior to large siltation load.Tonicates and spats of edible and pearl oysters were the major fouling after barnacles.ارتباط بین موجودات مزاحم و عمق مزرعه صدفهای مرواریدساز در قست شمال شرقی خلیج فارسموسسه تحقیقات علوم شیلاتی کشورمجله علمی شیلات ایران1026-13543419941122Biological and distribution studies of Astacus leptodactylus along Iranian coast of the Caspian Seaبررسی پراکنش خرچنگ دراز دریای خزر (Astacus leptodactylus ) (منطقه بندرانزلی )132211391710.22092/isfj.1994.113917FAشهروز برادران نویریبندرانزلیJournal Article20171218<span>There is no fishery of this species (Astacus leptodactylus) along the Iranian coast. Sampling carried out from August 1991 until August 1993 along Bandar Anzali coast the north of Iran. It was done with folding galvanized metal frame traps with 20mm mesh size (knot to knot). Amount of catch varies according to depths, locations and different seasons. The egg carrying females were observed during early May till the end of August in the water temperature of 8.6-8.8 °C. Catchability of males was approximately 4.156 times more than the catchability of females in this study. Total length of 63.7 percent of males and 72.1 percent of females were equal or more than 102 mm......</span>بررسی پراکنش خرچنگ دراز دریای خزر (Astacus leptodactylus ) (منطقه بندرانزلی )موسسه تحقیقات علوم شیلاتی کشورمجله علمی شیلات ایران1026-13543419941122Artificial propagation of (Aspius aspius)تکثیر مصنوعی ماهی ماش (Aspius aspius)213111391810.22092/isfj.1994.113918FAسید اسماعیل حسینیبندرانزلیJournal Article20171218<span>To obtain the normative s of artificial breeding biotechnique of Aspius aspius, mass production through artificial breeding and also recruitment of this valuable species, a project called “Artificial propagation of Aspius aspius” was planned and implemented. The project results indicate that: The reproduction season of this species is winter and its exact duration is from mid February to late march, in the climatic condition of Guilan province. The suitable spawning temperature range is 10-13 ˚C and egg incubation duration is 9-10 days- The effective dosage of pituitary gland to induce spawning is 3-4 mg per kg of fish weight. Hormone injection and egg stripping were carried out at time intervals of 25.5-30.5 hours. During the two years of project implementation (two spawning seasons, from February-march) 15 tests were carried out and 3.9 female breeders were injected. The number of normal eggs was 386-536 per gram and the swollen eggs were counted to be 117-277 per gram. The normal eg.....</span>تکثیر مصنوعی ماهی ماش (Aspius aspius)موسسه تحقیقات علوم شیلاتی کشورمجله علمی شیلات ایران1026-13543419941122Survey on benthos of Ghazaleh "and Ahmadi creeks in Mahshahr"بررسی بنتوزهای خورهای غزاله و احمدی در منطقه ماهشهر (استان خوزستان )334411391910.22092/isfj.1994.113919FAفریبا داودیاهوازJournal Article20171218<span>This study was carried out from March 1992 to Sept. 1993. During monthly sampling from 6 stations in two selected creeks (Ahmadi and Ghazaleh) in Mahshahr area, macrofauna and meiofauna were identified and counted. Also total organic matter of sediments was measured and grain size analysis was carried out. The results show that among macrofauna the dominant benthic animals were Polychaeta, Tanaidacea and Oligochaeta and their abundance was higher in spring and autumn. Among meiofauna, Nematoda, Foraminifera, Copepoda and Ostracoda were dominant and their abundance was higher in winter. T.O.M value was the lowest in winter and the highest in spring......</span>بررسی بنتوزهای خورهای غزاله و احمدی در منطقه ماهشهر (استان خوزستان )موسسه تحقیقات علوم شیلاتی کشورمجله علمی شیلات ایران1026-13543419941122Gourmet Leatherتهیه چرم از پوست تاس ماهیان455811392010.22092/isfj.1994.113920FAمحمود داورزنیساریJournal Article20171218<br />As the skin of Acipenser (Sturgeon fishes) have morphological, histo-logical and physio logical characteristics, they have suitable situation of fish scaly, thickness, resistance and enough elasticity. Therefore they can be useful in producing leather and leathery products. In this project, two hundreds skin pieces of different Acipenser Sturgeon-(Huso huso - A. gulden stadi- A. percicus A. undiventris - A. status) were examined in order to producing leather during eighteen months since 1990. At the end of this project a suitable method was found out for produc-ing skin and leather. In this project we used leathery factories facilities, but for obtaining desired results we changed some chemical substances and processing products. Therefore, with this proposed technic by catching mass fishes from the south shore of Caspian Sea more than one million square feet leather can be produced with different qualities. From different types of produced leather we can make bag leather, bind-ing leather, grean leather, fantasy leather, and leather of the mamalia together.تهیه چرم از پوست تاس ماهیان موسسه تحقیقات علوم شیلاتی کشورمجله علمی شیلات ایران1026-13543419941122Hydrology and Biology of Tadjan Riverهیدرولوژی و هیدروبیولوژی رودخانه تجن597211392110.22092/isfj.1994.113921FAمژگان روشن طبریساریJournal Article20171218<span>Tadjan River is the habitat of two groups of fishes, Sturgeon and teleost. Research survey in this river shows that the fish species basically belong to 6 families of Cyprinidae, Mugilidae, Gobbidae, Acipenseridae, Salmonidae and Esocidae. All studies on the aquatic organisms living in this river also indicate that aquatic submerged Microphytae mainly consist of Potamogeton which are distributed between the second and the fourth stations. 34 genesis of 4 Phytoplankton phyla are identified and the Zeoplankton existing in this river belong to 4 animal classes-working on the benthos was also among the research programme of this project and at the end, 13 families were identified......</span>هیدرولوژی و هیدروبیولوژی رودخانه تجن