• Catch status and stock management of tunas and related species in the Persian Gulf and the sea of Oman.

      Nikouyan, A. (1992)
      Tuna fishery industry in the Indian Ocean has shown a remarkable increase over the past decade which is mainly due to the improvements in the catch data collection system in various countries of the region as well as the recent development in Purse Scine Fishery. The total tuna catch from all countries in the region, the Persian Gult and the Sea of Oman, has been recorded over 56000 mt in 1989. The Islamic Republic of Iran with 21.000 mt stands in the second place after Sultanat of Oman. The total catch of seerfishes in the Indian Ocean has increased from 43.000 mt in 1988. The total landing of seerfishes from the Persian Gulf and The Sea of Oman has also been recorded as 31,000 rnt in 1989, of which Iran landed 4188 mt. The total catch of tuna and seerfish from all countries of the region, has been compared and discussed. According to the estimation of the total production of turva species per unit area of the coast line for each country in the region and the average production per unit area from whole regon it has been concluded that Islamic republic of Iran can achieve an annual catch potential of 25 to 33 mt of tuna species, The development and management prospects of tunas and seerrishes both in Iranian waters and other regional countries along the Persian Gull and the Sea of Oman has also been discussed.
    • Temperature and water fluctuations southern Caspian sea

      Mellat-Parast, A. (1992)
      A special temperature fluctuation exists in waters of Southern Caspian Sea Depth survey of upto 100 m indicates that there are two thermal phenomena annually, One thermal phenomenon occurs in summer and autumn and the other one in winter and spring. The least disolved oxygen concentration at various depth was recorded in depth of 100 m and was 7 mg/l, This is an indication of good mixing of lake strata because of two cold cycles in winter and spring.
    • Management of shrimp resources the Persian Gulf (I.R. IRAN)

      Vosughi, A. (1992)
      Shrimp is one of the most valuable marine products. Industrial exploitation of the Persian Gulf shrimp resources of Iran began in 1959. Long coastal areas of Iran provides half of the total shrimp stocks in the Persian Gult region. in the early years of the commercial exploitation of shrimp resources, the rich stocks supported annual catches per boat of upto 118 tons of unneaded shrimps But, the increase in industrial fishing vessels as well as in small wooden vessels has caused progrsively reduced catches every year after to date. Although introduction of restrictive measures, such as, closed fishing seasons, improved resources magnitude mean annual catches of industrial vessels per boat hasfallen upto 17 tons per year. In this survey, the increasing number of industrial fishing vessels serving shrimp iridustry of Iran and the subsequent reduction in the annual catch of shrimp is analyzed and several recommendations for better management of shrimp resources are presented.
    • Identification and distribution of lobster species in southern waters of Iran

      Zarshenas, G. (1992)
      Data collected indicate presence of lobster throughout the rocky shores of the Sistan and Baluchestan province and few islands (e. g. Abu-Mussa, Larak. Tonb-e-Bozorg and Tonb-e-kuchek) in the Hormozgan province of Iran. There are four known species of Lobster in Southern waters or Iran. thies are grouped in pallinuridae family, and from Scyllaridae family.
    • Multiplication and culture of the Persian Gulf shrimp

      Matinfar, A. (1992)
      The shrimp one of the most important crustecearis in the Persian Gulf waters is examined to identify ways of its multiplication and culturing in vitro This study, which started In middle of May, 1986 and lasted throughout September, 1986, was carried out in the Aquaculture Drvision of the Fishery Research Center of Bushehr. The results obtained in this research indicate the passibility of multiplication and culture of the Persian Gull tigershrimp in fishery facilities of Iran.
    • Investigation on the infection of Capoeta capoeta with Clinonstomum and its life cycle in the Shirrod River

      Malek, Masoomeh (1993)
      This is the first report on the C. capoeta infestation with C. complanatum. 112 fish sampled and surveyed for the likely infection with C. complanatum. Using the length group, extent of contamination, sex, infected organs and number of parasites in each organ, various graphs prepared. It was concluded that female fish were the most infected with decreasing percent of infestation as the body length increased. Gill cavity and pharynx were demonstrated to be the main contaminated areas and ten parasite per fish was the greatest number recorded. Contaminated organs were subject to pathological studies. Since birds are the end host separated metacercariae were fed to 15 chicks and their maturity stages was investigated at different time intervals in contaminated organs. The parasites were mature after three days.
    • Hydrobiological survey of Gorgan-Bay

      Lalouie, Faramarz (1993)
      A preliminary study was carried out to understand Gorgan-Bay ecosystem as a whole and determine environmental factors affecting it. Gorgan-Bay with an area of 400 Km^2 is situated in the south-eastern part of the Caspian Sea. There have been four canals connecting the Bay to the sea, now reduced to only one. Average pH is found to 8.3 and there is no difference in total alkalinity, total hardness and pH of the Bay compared 10 the Caspian Sea. Water temperature ranges from 5 °c to 30°c in a year. The bottom is covered with Marine alluvial and colluvial sediments with the organic materials originating from dead plants and non-skeletal parts of marine oysters. Pollution sources include urban/industrial sewage and pesticides. During the study 8 genus of zooplankton and 16 genus phytoplankton were identified with the abundance ranging from 71,000 to 12,915,000 per cubic meter. Identified fishes include natural and artificially produced Cyprinus carpio, Aspius aspiuc, Rutilus rutilus caspius, Mugil sp. and Gobius sp.
    • On kilka fishing status in the Caspian Sea

      Razavi, B. (1993)
      lran's commercial catch on this fish commenced in 1971 and in spite of recent years endeavour to boost the development of kilka fishery, the catch did not exceed 15 thousand tones by year 1991. In this regard a one year survey program conducted in 1991 data collected and stock status identified in Iranian coastline at areas with a seabed depth of 40 to 80 m, in 56 fishing stations spaced at 10 mile intervals along the coast. The survey showed that Clupeonella engruliformis is dominant (91.8 %) followed by Clupeonella grimmi (6.84%) and Clupeonella cultriventris which shared only 1.35% of the total catch. Furthermore 69.95% of Anchovy type kilka, 81.06% of Big eye kilka and 80.88% of common kilka belonged to 2+ and 3+ year class. This major fishing study which carried out in Bandar Anzali using "Catch per Unit Effort" Method, reflects practical variability in fishing and shows that there are more suitable areas with higher densities than Bandar Anzati stations which are yet unexploited. 17 fishing stations from among 56 demonstrate catch rate ranging from 800-1200 kg kilka per unit effort per hour which can h ranked in the first class of kilka yielding grounds, Traditional fishing grounds in Anzali show the catch rate of 400-800 kg per unit effort per hour which is the second class in kilka fishing grounds category. The Iranian coastline bottom topography features sharp slopes which is a favorable habitat for wintering of kilka. The present study shows that possible yearly catch can be promoted up to a ceiling of 100, 1000 metric tons.
    • Anesthetizing Pinctada radiata with MS-222

      Ehteshami, Fariborz (1993)
      The effect of MS 222 for inducing anesthesia in 60 P. radiata was studied under different concentration and various stimulating factors. Based on the results of mortality rate, induction time, duration of anesthesia, recovery time, responses of the organism to the anesthetic and handling, it was concluded that the concentration of 1ppt of MS-222 was the best for inducing anesthesia, in P. radiata.
    • Evaluation of octadecyl-bonded silica membrane disk for extraction of surfactants from water

      Ashraf-Khorassani, M.; Yamini, Y. (1993)
      Octadecyl-bonded silica membrane disk was evaluated for extraction of surfactants from water. Different parameters such as extraction efficiency, maximum capacity of the disk, proper eluent for washing the surfactants from the disk and effect of vacuum pressure on percent recoveries were studied. Results showed that more than 95 percent of surfactants were extracted easily from water, Maximum capacity of the disk was about 5 mg. Also it was determined that this technique compare to liquid/liquid extraction would introduce less error in analytical results.
    • The chronological development of embryo in Rutilus frisii kutum, Kamensky

      Parivar, Kazem; Behzadi, Saffiea; Razavi, Bahram (1993)
      The chronological development of Rutilus frisii kutum, Kamensky from Caspian Sea was investigated. Artificial propagation was carried out by stripping sperm on the eggs. The gametes were gently mixed for 5 minutes, then incubated at 14-16°C in 8 liter glass incubators. Development of embryos including organogenesis and different chronological developmental stages were followed up morphologically and histologically. As the chorion is semitransparent in this species, we were forced to dechlorinate the eggs. So the chorionic is develops of the embryos were removed under stereomicroscope using two fine needles; weight and length of the samples at each stage were measured for statistical analysis. The embryos were prepared for serial sectioning and microscopic studies. The developmental stages were investigated from 5 minutes after fertilization up to day 30. Fertilized eggs were cleaved and gastrulation began within 24-30 hours. Most of the embryos began to batch out of chorion (Vitelline membrane) at 216 hours (10 days after fertilization) and resorption of the yolk material was completed in day 16. After this stage, the larvae matured and began to swim up and feed on fish food (swim up, fry stage). Twenty-four stages of embryonic development of this fish at 14-16 °C have been described with emphasis on the cleavage stages and morphogenesis of external organs and body tissues.
    • Some observation on the length frequency distribution and gonad development of longtail Tuna in Iranian Waters

      Nikouyan, A.; Firozi, A. (1993)
      Sampling of longtail tuna (Thunnus longgol) wa conduced during each delivery of tuna catch to the tuna. canning Factory in Bandar-Abbas, Length frequency data was collected on a monthly basis. All individuals in the samples were examined for sex identification. The maturity stages for females were determined according to a 5 point scale.For the purpose the gonad index based on the weight of the fish was applied, most longtail tuna captured off the alost coast Iran principally from the Gulf of Oman arc considerably larger ranging from 75 to 80 Cm fork length. Fish below 55 Cm length were not represented in the samples. This results provide no modal progession for the monthly lenght frequency. Thy possible sourocs creating bias in the length distribution data such as migratory nature of longtail tuna and gear selectivity has been discussed. Thc study on the maturity magos reveals. that the spawning season for longtail tuna captured in Iran from the sea of Oman extraids from August through October. The possible multiple spawning season for this species has also been discussed.
    • Surveying methods and quantity of small scale fishing in the western part of Hormozgan Province

      Mazhari, Taghi (1993)
      The survey was conducted in the western part of Hormozgan province in the spring of the year 1370 (1991) and covered nine important landing centres in the area From east to west these centres are as follows: Bandar - e - Kang, Bandar - e - Lengeh, Bostaneh, Maghvieh, Hosseinieh, Garzeh,.Moghom, Lavan Island and Gavbandi.. Acquired results show that on average 306 vessels including122. boats, 153 launches and 31 sardine fishing boats named Ammeleh, has been active every month, During the investigation period, 2280 tones of various aquatics catched of which sharks (CARCHARHINIDAE sharing %16 (365 tonnes) of the Tidal catch ranked in the first grade. Also among The investigated center, Bandar - e - Kang with 84 launches and a total catch of 1409 tonnes was the most active. The most important gear used in fishing was gilinet, sharing %78 of the total catch.
    • Biological Survey on cuttlefishes of Systan-o-Baluchistan waters (Southeastern Iran)

      Valli Nassab, Touradj (1993)
      Species of cephalopoda and biological characteristics of Sepia pharaonis, were investigated in tho fishing grounds of Goitre" to "Gallak" corresponding to 61,31 - 59,30 eastern longitude and 25,10 - 25,23 northern latitude respectively. The balk of the study was confined to chabahar estuary during which 8 cephalopoda species were identified With Sepia pharaonis beingihe dominant one. Spawning of S. pharapnis occurs between the two southwest and northeast monsoon periods in December and November. Although spring spawning is demonstrated to occur, it is Are spawning which coniribute mostly io regeneration of S. pharapnis. Water temperature in spawning season varies between 22 to 28.5 degrees centigrade. Fishing season in this arca overlaps with spawning or S. pharaonis and in this period they have been found to migrate from deeper waters to shallower waters in littoral zone. The best fishing grounds in Systan - o - Baluchistan provirice are recognized to be "Ties and "Pozm". A series of analyses carried out on the meat, ink and cuttle bone of S. pharaonis and the ratio of ingredients were Determined.
    • Quantitative analysis of meat properties in some Tuna fishes

      Khorshidpour, B. (1993)
      A scrics of on the analyses on the meat tuna fishes from fishing till canning stage were carried out for this experiment sample were taken from fresh defrost and canned fishes of yellow tuna skipjack tuna, esterni little tuna, Iittle tuna and long tail tuna.
    • Fish immunology

      Peighan, Rahim (1993)
      If a piece of life tissue of a person is grafted to another person, after a short period the transplanted tissue will be disintegrated and disappear. Also in most infectious diseases , the victim will be resistant against the malady after recovery. Such body responses are are called Immunological reactions and the study of these reactions, mechanisms involved and related consequences is known as Irnmunology. Of the most important applications of Immunology are disease prophilaxy (through vaccination), diagnosis and treatment.
    • Synthesis of Chitosan and Glucosamine from Crustaceans Wastes (Shrimp, Crab, Lobster)

      Tahami, Mahdieh (1993)
      Processing Crustaceans results large amount of shell left overs. Chitin a natural polymer, constitutes the major part of this waste.Optimal application of this material in different fields may bring about a new era of activity based on chitin industry. Practically, large amounts of crustacean left overs is wasted. Glucosamine and chitosan, with a wide application are being made from these wastes., Heating chitin in the presence of sodium hydroxide. under nitrogen leads to formation of chitosan with 70 - 90%. purity degree. In presence of concentrated hydrochloric acid, chitin is converted into glucosamine with 60 - 70% purity degree. Chitin and Glucosamine are widely used in sewage treatrnent, glue production. food.industries, cosmetics paper mills, agriculture , medicine, dentistry, pharmaceutics, textile chromatography. photograiry. etc.
    • Plankton survey in the southern part of the Caspian Sea

      Fallahi, Mayam (1993)
      A Plankton survey was conducted in the southern part of the Caspian Sea in order to idlentify the plankton communities and to put the exploitation of these aquatic resources on a rational and sustainable basis. A column of water from surface to bottom was sampled in different seasons, abundance and distribution of Phyto and Zooplankton was determined for the surface transparent aid thermocline layers.
    • Biological Survey of Chalcalburnus chalcoides guldenstadti Spawning Migration in Anzati Lagoon

      Karimpour, M.; Hosseinpour, N.; Haghigni, D. (1993)
      Different biological forms of Chalcalburnus chalcoides, which is called Sharnaya in Russian and Saphidcooly in Persian, are distributed in the Caspian Sea, Aral Sea and Black Sea, The saphidcooly which live in the Caspian Sea scattered in the southern and western regions. and enter the Kura and Terek Rivers in the northern coast fur spawning (Berg. 1965). The Anzali lagoon Saphidcooly is smaller in size cornparad with the Kura's population, but the results of this survey indicate that after maturation, The Anzali lagoon Saphidcooly show greater growth than the Kuras population. the migration for spawning to Anzali lagoon commences in March with slow run, and reaches the peak in May and the beginning of June.
    • Surveying Adrenaline Influence Upon Acid Phosphatase Activity in Crassostrea cucullata Gonadal Extract

      Roostaeian, Peyman (1993)
      The effect of Adrenaline on Acid phosphatase activity in the gonadal extract of C. cucullata at different time intervals (10, 20, 30 minutes) and adrenaline concentrations (0,.074, 0.74, 7.4. 74 Rgrn1-1) was studied. The results showed that there is highly significant ccarrelation between time intervals (IV)1 and acid phosphate activity (DV)2 at different adrenaline concentrations (P < 0_05 r > 0.999). Aditionally, no significant correlation was detected between adrenaline concentration (IV) and acid phosphatase activity (DV) at different time intervals (F> 0,2. , r> 05).