شهرام فرقانی

This project accomplished with aim of new studies on the type and nutritional content density, coefficient of empty stomach and detection it’s favorite food in different months of year on silver Pomfret fish. For this reason 1095 fish of this kind captured from station: Musa estuary, Bahrekan, Boshehr and Dayyer in the north-east of Persian gulf in year (2012-13), and their sampling of stomach and intestine is performed in there. Thus, the detection nutritional resources in samples includes 18 kind of food with plant source and 12 kind with animal source, that observed greatest food preference from plant sources Diploneis sp., Nitzschia sp., Rhizosolenia sp., & Ceratium sp. (totally with preference 50.37 %) and from animal sources Copepoda, Cladocera & Ostracoda (totally with preference 24.72 %) and also Peridinium sp. & Prorocentrum sp. are from plant resources (respectively 2.4 % and 3.51%) that observed accidently in their nutritional diet. Most nutrition compression occurred in the year between October and February that have mainly plant source, and amount of food with plant source decreases and increases animal source in the year between April to May (P<0.01). On the base of coefficient of filled stomach and intensive of fish, the lowest coefficient is related to May until September with average 37.05 percent and highest amount observed with a mutation in April with 79.8 percent at two years.

Penaeidae family is one of important index of shrimp stores in the Persian Gulf that has been studied the larva stores and fishing effort (SPUE) between 2012-14, also studied maximum of sustainable production (MSY) and the index of maximum of real withdrawal (MCY) on twelve years ago in the northwest casts of Persian Gulf. According to this the most abundant species that identified from penaeid larva are consist of Prapenaeopsis stylifera 1806 number and lowest number of Penaeus is P.semisulcatus (green tiger shrimp) consist of 181 number of total samples that be taken that average of larval density in 10 m² observed 250 number in surface unit in during the year, on the other hand by obtaining the average index of fishing effort in terms of kilograms per hour (Kg/h) 5.57 and the average of the maximum real withdrawal with KADIMA order in the last twelve years (1637.99 ton per year) and it’s comparison with capture average (1560.17 ton per year) in during mentioned period despite the harmony between averages of this two index, still decrease of liner trend of capture was observed with coefficient 0.87 because of lack of normal distribution during the last twelve years (P<0.01).

Pomfret is one of the valuable and economic fishes in the Persian Gulf. According to observations and reports in the last 10 years, amount of fishing and it’s average size in the fishermen net is strongly decreased. The problems in it’s artificial reproduction, make impossible the restoration by reproduction way. For this reason accurate evaluation of population and then store management according to principles of population dynamic and it’s biology in the stable exploitation is necessary order. For this purpose performed extensive study between 2007 – 2013 years, that in this section is accounted growth coefficient, natural death amount, total death amount, fishing coefficient amount and then exploitation coefficient for evaluation; has been studied sexual testis and fishes puberty stages for store management. Growth coefficient is accounted during study 0.4, and after accounting total death, natural death and fishing coefficient, exploitation coefficient amount is 0.1296 that shows store reduction and critical status of population. The fish has a long spawning period from May to November (p 0.001). And the greatest sexual activity is in the female fishes with standard length 25.5cm and in the male fishes with standard length 21.5 cm (p<0.01).