A Study on Reproductive Investment of Leaping Grey Mullet (Liza saliens) in the Southwest Caspian Sea (Bandar Anzali)
Kaveh
Amiri
گروه شیلات، دانشکده منابع طبیعی، دانشگاه گیلان، صومعه سرا
author
Ali
Bani
گروه شیلات، دانشکده منابع طبیعی، دانشگاه گیلان، صومعه سرا
author
Shahtam
Abdolmaleki
پژوهشکده آبزی پروری آبهای داخلی کشور، بندر انزلی
author
Narges
Alijanpour
گروه شیلات، دانشکده منابع طبیعی، دانشگاه گیلان، صومعه سرا
author
text
article
2012
per
The pattern of energy allocation to reproduction varies among the fish species due to their differences in size, habitat, feeding and reproductive strategy. This study surveyed the reproductive energy allocation of leaping grey mullet on the Anzali coast in the province of Guilan, Iran. A total number of 94 leaping grey mullet (20.32±0.2 cm [mean±SE]) were caught in three reproductive states: pre-spawning, spawning, and post-spawning from February to September 2011. The energy content liver, muscle, and ovary were investigated. The energy of liver and muscle changed over the reproductive status. Additionally, leaping grey mullet allocated less energy to reproduction. However, first and second time spawners of leaping grey mullet showed similar energy allocation to reproduction in the spawning season.
Journal of Fisheries
دانشکده منابع طبیعی دانشگاه تهران
2008-5729
65
v.
3
no.
2012
235
242
https://jfisheries.ut.ac.ir/article_29487_a63ed5d7e0a38f3db6fd4eb6ab49c80b.pdf
dx.doi.org/10.22059/jfisheries.2012.29487
Optimization of Extraction of Antioxidant Compounds in Microwave-Assisted Extracts of Brown Algae Sargassum angustifolium
Aria
Babakhani Lashkan
گروه فرآوری محصولات شیلاتی، دانشکده علوم دریایی، دانشگاه تربیت مدرس
author
Masoud
Rezaei
گروه فرآوری محصولات شیلاتی، دانشکده علوم دریایی، دانشگاه تربیت مدرس
author
Keramatollah
Rezaei
گروه علوم و مهندسی صنایع غذایی، دانشکده بیوسیستم، دانشگاه تهران
author
Seyed Jafar
Seifabadi
گروه بیولوژی دریا، دانشکده علوم دریایی، دانشگاه تربیت مدرس
author
text
article
2012
per
Microwave-assisted extraction was applied for extraction of algal extracts from brown algal species (Sargassum angustifolium). Extraction condition consists of three solvents (ethanol, methanol and water), three extraction times and powers of microwave (10min×90W, 20min×180W and 30 min×270W) and three ratios of algae to solvent (1:5, 1:10 and 1:20). All the experimental parameters were applied at three levels according to Taguchi's statistical design. Total phenol contents, individual phenolic compounds, DPPH scavenging activity, ferrous reducing power and total antioxidant activity of the extracts were determined. According to results, the best condition for extraction of antioxidant compounds from S.angustifolium was aqueous extract, ratio of sample to solvent 1 to 20 and 30 minute extraction time and microwave power of 270 W. The TPC, DPPH scavenging activity, FRAP and TAA in optimized treatment are respectively; 2.60 TAE, 1.80 ASAE, %60.04 and 36.45 ASAE. The water extract of Sargassum have phenolic compund such as, gallic Acid (7.33 µg/ml), Protocatechuic acid (29.93 µg/ml) gentistic acid (15.15 µg/ml) and hydroxy benzoic acid (14.61 µg/ml). Results show that this algae was suitable for the extraction of antioxidant compounds.
Journal of Fisheries
دانشکده منابع طبیعی دانشگاه تهران
2008-5729
65
v.
3
no.
2012
243
255
https://jfisheries.ut.ac.ir/article_29488_bac255100c187da35441bb35e67467b3.pdf
dx.doi.org/10.22059/jfisheries.2012.29488
Composition and Abundance of Phytoplankton and Zooplankton from Earthen White Leg (Litopenaeus vannamei) Shrimp Ponds
Narjes
Bakhtiari
گروه شیلات، دانشکده منابع طبیعی، دانشگاه صنعتی اصفهان، اصفهان، ایران
author
Omidvar
Farhadian
گروه شیلات، دانشکده منابع طبیعی، دانشگاه صنعتی اصفهان، اصفهان، ایران
author
Nasrollah
Mahboobi Soofiani
گروه شیلات، دانشکده منابع طبیعی، دانشگاه صنعتی اصفهان، اصفهان، ایران
author
Mehdi
Mohammadi
مرکز مطالعات و پژوهش های خلیج فارس، دانشگاه خلیج فارس، بوشهر، ایران
author
text
article
2012
per
In this research, composition and abundance of phytoplankton and zooplankton were investigated at earthen ponds of white leg shrimp (Litopenaeus vannamei) in Delvar, Busher. During culture period, variation range of water temperature, salinity, dissolved oxygen and water transparency were 24-32?C, 45-50 g/L, 3.5-5.5 mg/L and 60-140 cm, respectively. The dominant genera of phytoplankton communities were Navicula, Cosinodiscus, Nitzchia, Rhizosolenia and Pleurosigma from Bacillariophyceae, Peridinium and Ceratium from Dinoflagellates, Oscillatoria from Cyanobacteria, and Nannochloropsis from Chlorophyta. Investigation on zooplankton showed that their community mostly was copepod, rotifer, sergestid, polychaet, and crustacean larvae. The most abundant zooplankton assemblage was copepod which range of calanoid, cyclopoid and harpacticoid were 3-17 ind./L, 0.2-5 ind./L and 0-1 ind./L, respectively. The dominant genera of calanoid and cyclopoid were Acartia and Centropage, and Oithona, respectively, and harpacticoid had only one genus of Euterpina. Abundance of total zooplankton and total copepod had significant differences during culture of L. vannamei. Person’s correlations showed that there was significant correlation between abundance of calanoid and dissolved oxygen (r= -0.43) and salinity (r= -0.54) and also between abundance of cyclopoid and water temperature (r= 0.38) and pH (r= 0.32). In general, total zooplankton abundance had significant positive correlation with dissolved oxygen (r= 0.39) and pH (r= 0.37). Results of Principal Component Analyses (PCA) showed that rotifer abundance, pH and total zooplankton abundance as first factor and salinity and dissolved oxygen as second factor could be used to explain most of variation in zooplankton community in L. vannamei shrimp ponds.
Journal of Fisheries
دانشکده منابع طبیعی دانشگاه تهران
2008-5729
65
v.
3
no.
2012
257
269
https://jfisheries.ut.ac.ir/article_29489_2e1cf671597104820a52ee2542e87f8d.pdf
dx.doi.org/10.22059/jfisheries.2012.29489
The Effects of Copper and Cadmium Exposure on Biochemical Factors of Plasma and Liver in Beluga Sturgeon, Huso huso (Linnaeus, 1758)
Saeid
Zahedi
گروه شیلات، دانشکده منابع طبیعی کرج، دانشگاه تهران
author
Ali Reza
Mirvaghefi
گروه شیلات، دانشکده منابع طبیعی کرج، دانشگاه تهران
author
Bagher
Mojazi Amiri
گروه شیلات، دانشکده منابع طبیعی کرج، دانشگاه تهران
author
Gholamreza
Rafiee
گروه شیلات، دانشکده منابع طبیعی کرج، دانشگاه تهران
author
Mehdi
Hedayati
مرکز تحقیقات چاقی، پژوهشکده علوم غدد درون ریز، دانشگاه علوم پزشکی شهید بهشتی تهران
author
Changiz
Makhdoomi
مرکز بازسازی ذخایر و تکثیر و پرورش ماهی شهید رجایی ساری
author
Mousa
Zarei Dagesaraki
مرکز بازسازی ذخایر و تکثیر و پرورش ماهی شهید رجایی ساری
author
Saeid
Mahdavi Sahebi
گروه شیلات، دانشکده شیلات و محیط زیست، دانشگاه علوم کشاورزی و منابع طبیعی گرگان
author
text
article
2012
per
This study was undertaken to evaluate the effects of single sub-lethal copper (Cu) and cadmium (Cd) exposure on biochemical factors of plasma and liver in juveniles beluga sturgeon, Huso huso. A total of 54 fish (weight: 55.4±6.8 g; age: +4 months) were exposed to 20 and 300 µg/l of Cu and Cd in semi-static conditions for 14 days on June (2008), respectively. Then, the effects of these sub-lethal metal concentrations on selected biochemical factors were assessed during 14 days. Results showed that there were no significant differences in plasma glucose, total protein, triglyceride as well as liver protein levels among groups on day 14. Also, metal exposure had significant effects on plasma triiodothyroxine (T3) but not on thyroxine (T4) levels. In contrast, plasma cortisol levels increased significantly compared to the controls only in Cu exposure. No significant differences were observed in liver catalase (CAT) and superoxide dismutase (SOD) activities between experimental groups and controls, but there was significant difference in SOD activities between two metal treatments. This study demonstrated that sub-lethal doses of Cu and Cd were effective on beluga sturgeon. Moreover, it showed that hormonal changes were appropriate biomarkers for Cu exposure in fresh water in beluga sturgeon.
Journal of Fisheries
دانشکده منابع طبیعی دانشگاه تهران
2008-5729
65
v.
3
no.
2012
271
282
https://jfisheries.ut.ac.ir/article_29490_fd3a01062dab579fd4a2bdfad18b2a5d.pdf
dx.doi.org/10.22059/jfisheries.2012.29490
Possibility of White Leg Shrimp (Litopenaeus vannamei) Production Twice a Year in the Shrimp Farms of Western Hormozgan Province
Hasan
Sareban
گروه شیلات، دانشکده کشاورزی و منابع طبیعی، دانشگاه هرمزگان، بندرعباس
author
Ehsan
Bozorgi
مجتمع کشت و صنعت خلیج نای بند، بندرمقام
author
Ehsan
Kamrani
گروه بیولوژی دریا و آبزیان، دانشکده کشاورزی و منابع طبیعی، دانشگاه هرمزگان، بندرعباس
author
Mir Masoud
Sajjadi
گروه بیولوژی دریا و آبزیان، دانشکده کشاورزی و منابع طبیعی، دانشگاه هرمزگان، بندرعباس
author
Saeid
Masandani
اداره کل شیلات استان هرمزگان
author
text
article
2012
per
This study was conducted to evaluate the possibility of white leg shrimp (Litopenaeus vannamei) culture twice a year in Nayband Agro-industry complex in 2010. Three earth ponds (0.8 ha) were selected in the farm which had similar conditions in terms of culture system, postlarvae age (PL12) and stocking density (37-38 PL m3). The first period of shrimp culture started from mid April and they were harvested in mid July after 93 days. The second period of culture started in mid August and shrimps were harvested from the ponds in early December after 110 days. Final weight, survival, total production and feed conversion ratio (FCR)in the first period of culture were 13.5 ± 3.12 g, 80 ± 2.27 percent, 3200 ± 27 kg and 1.2 ± 0.09, respectively. These factors were 17.5 ± 3.31 g, 85 ± 2.35 percent, 4500 ± 119 kg and 1.09 ± 0.05 for the second period of culture, respectively. The results of the present study showed that the number of culture days, final weight and survival of shrimps in the second period of culture was higher compared with the first period of culture. Better FCR in the second period of culture showed that the condition of culture in this period is better and more economical than first period of culture. There was 9600 kg shrimp in the twice a year production system that is three times more than common shrimp production system (once a year) in the shrimp farms of southern Iran.
Journal of Fisheries
دانشکده منابع طبیعی دانشگاه تهران
2008-5729
65
v.
3
no.
2012
283
293
https://jfisheries.ut.ac.ir/article_29491_f25328c8fff0a4c4c632ae8b737b93c7.pdf
dx.doi.org/10.22059/jfisheries.2012.29491
Seasonal Changes of Some Physiological Parameters of Salmo trutta caspiusfingrlings in Fresh and Brackish Water
Koroush
Sarvi Moghanlou
گروه شیلات، دانشکده علوم دریایی، دانشگاه تربیت مدرس، نور، مازندران، ایران
author
Mohammad
Kalbassi
گروه شیلات، دانشکده علوم دریایی، دانشگاه تربیت مدرس، نور، مازندران، ایران
author
Bagher
Mojazi Amiri
گروه شیلات و محیط زیست، دانشکده منابع طبیعی، دانشگاه تهران، کرج، ایران
author
text
article
2012
per
In this study, in order to determine the appropriate time and size to release Salmo trutta caspius, in Kelardasht center conditions, some biometric and physiological parameters were investigated. In this regard, sampling was carried out twice in each season from Parr (one-summer fingerlings) to smolt (two- summer fingerlings) stages in the course of 1 year. The trend of length, weight and condition factor, ions, Osmolality, thyroid hormones (T3, T4) and Cortisol levels of plasma in Freshwater fish and those transferred to Caspian sea Brackish water were measured. Based on the results, weight and length of fishes increased significantly from 8 g and 9.2 cm in autumn to 35.3 g and 14.9 cm in next summer, respectively (p
Journal of Fisheries
دانشکده منابع طبیعی دانشگاه تهران
2008-5729
65
v.
3
no.
2012
295
305
https://jfisheries.ut.ac.ir/article_29492_54df2dc8115c1d75e2db1f5c83ad8d19.pdf
dx.doi.org/10.22059/jfisheries.2012.29492
Qualitative Assessment of Golden Gray Mullet Stocks (Liza aurata Risso, 1810) in the Caspian Sea (1991-2011)
Hasan
Fazli
بخش ارزیابی ذخایر، پژوهشکده اکولوژی دریای خزر، ساری، ایران
author
Gholamreza
Daryanabard
بخش ارزیابی ذخایر، پژوهشکده اکولوژی دریای خزر، ساری، ایران
author
text
article
2012
per
The main objective of the present study was qualitative assessment of golden gray mullet stocks by using indicators of overfishing in Iranian waters of the Caspian Sea during a long period (1991-2011). Three fisheries indicators in catch were: 1. percentage of mature fish, with 100% as target; 2. percent of specimens with optimum length, with 100% as target; and 3. percentage of mega-spawners, with 0% as target, and if no upper size limit exists, 30-40% as representative of reasonable stock structure. Over this period, the condition factor of golden gray mullet showed decreasing trends, declined from 1.16 in 1993-1994 to 1.01 in 2010-2011. The range of length with optimum yield was between 31.8-38.8 cm, using biological parameters. The mega-spawner measured as fish a size larger than 38.8 cm. According to these three indicators, the percentage of mature (fork length>28 cm), optimum size and mega-spawners were ranged between 58.6%-88.4%, 26.4%-47.6% and 6.8%-29.0%, and were averaged (±S.D) 76.0%±6.78, 36.1%±5.44 and 18.9%±5.71, respectively. Therefore, for conservation and revitalization of golden gray mullet in the Caspian Sea, the target would be to all (100%) fish spawn at least once, using bigger mesh size in sac (e.g. 33 mm, during whole fishing season), also, the aim would be to implement a fishing strategy that result no (0%) mega-spawners being caught, and the main catch focus on optimum length. Also, the start of the fishing season should be delayed in order for stocks to complete their spawning.
Journal of Fisheries
دانشکده منابع طبیعی دانشگاه تهران
2008-5729
65
v.
3
no.
2012
307
315
https://jfisheries.ut.ac.ir/article_29493_010bb3abb552347b507cfa98983b218f.pdf
dx.doi.org/10.22059/jfisheries.2012.29493
A comparative Study on Different Transition Times from Live Food to Artificial Feed in the Rearing of Pikeperch (Sander lucioperca) Larvae
Hadis
Mansouri Taee
دانشگاه آزاد اسلامی، واحد خرم آباد، باشگاه پژوهشگران جوان، خرم آباد، ایران
author
Hossein
Ouraji
گروه شیلات، دانشکده علوم دامی و شیلات، دانشگاه علوم کشاورزی و منابع طبیعی، ساری
author
Hossein
Rahmani
گروه شیلات، دانشکده علوم دامی و شیلات، دانشگاه علوم کشاورزی و منابع طبیعی، ساری
author
Iraj
Efatpanah
مرکز تکثیر و پرورش آبزیان دکتر یوسف پور، سیاهکل
author
Mahboubeh
Nematzadeh
گروه شیلات، دانشکده علوم دامی و شیلات، دانشگاه علوم کشاورزی و منابع طبیعی، ساری
author
text
article
2012
per
The aim of the peresent study was to find the optimum weaning time to shift pikeperch larvae feeding from live food to the artificial feed. In this experiment, pikeperch larvae were fed with seived pond zooplankton (mainly rotifers) and Artemia nauplii from the first feeding day to day 16 of post-hatching. then three weaning times were used on day 16 (W16), day 22 (W22), and day 28 (W28) of post-hatching, and compared with a control group (fed on only live food). According to the obtained results, the best growth (mean weight gain = 152. 8 mg) and the highest survival rate (61.6%) were found in larvae fed only on live food during the whole period of rearing. The lowest weight gain (28 mg) and the lowest survival rate (13.3%) were observed in larvae weaned at day 16 post-hatching. From the biological point of view (growth parameters), the most suitable method of pikeperch larvae rearing was exclusively with live food throughout the experiment (0-34 days), however, the results of growth performance in larvae weaned at day 28 post-hatching was noticeable.
Journal of Fisheries
دانشکده منابع طبیعی دانشگاه تهران
2008-5729
65
v.
3
no.
2012
317
325
https://jfisheries.ut.ac.ir/article_29494_72ccff778ce4708b74d28ff75137745a.pdf
dx.doi.org/10.22059/jfisheries.2012.29494
Identification of Brown Trout, Salmo trutta, of Mardgh River in Liqvan River (Iran), Using Microsatellite Loci
Iraj
Hashemzadeh Segherloo
گروه شیلات و محیط زیست، دانشکده منابع طبیعی و علوم زمین، دانشگاه شهرکرد، شهرکرد
author
Hamid
Farahmand
گروه شیلات، دانشکده منابع طبیعی، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج
author
Asghar
Abdoli
گروه تنوع زیستی، پژوهشکده علوم محیطی، دانشگاه شهید بهشتی، تهران
author
Louis
Bernatchez
گروه زیست شناسی، دانشگاه لاوال، کبک، کانادا
author
Mahmood
Karami
گروه محیط زیست، دانشکده منابع طبیعی، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج
author
text
article
2012
per
In this study brown trout Salmo trutta populations in Mardagh and Liqvan Rivers from the West and East Azerbaijan provinces (Iran) were studied using 12 microsatellite loci. In total 52 fish from the mentioned populations and 45 fish from Babolrood and Haraz Rivers were analyzed. According to the analysis of the private alleles, Hardy-Weinberg equilibrium test and genetic differentiation between the populations (Fst=0.04) and based on other reports, it can be concluded that during the years 2004-2007, there should be at least a case of brown trout transfer from Mardagh to Liqvan River. In both the Liqvan and Mardagh Rivers private alleles specific to each river were observed, indicating that indigenous brown trout were existent in Liqvan River prior to fish transfer.
Journal of Fisheries
دانشکده منابع طبیعی دانشگاه تهران
2008-5729
65
v.
3
no.
2012
327
337
https://jfisheries.ut.ac.ir/article_29495_0330f1c323d3f99899012108b9a8b3a4.pdf
dx.doi.org/10.22059/jfisheries.2012.29495
Effluent Characterization and Rate of Mineralization of Sludge Produced by Rainbow Trout (Oncorhynchus mykiss)
Mohammad
Harsij
گروه شیلات، دانشکده کشاورزی و منابع طبیعی دانشگاه گنبدکاووس، گنبدکاووس
author
Gholamreza
Rafiee
گروه شیلات، دانشکده منابع طبیعی دانشگاه تهران، کرج
author
Ali Reza
Mirvaghefi
گروه شیلات، دانشکده منابع طبیعی دانشگاه تهران، کرج
author
Hadi
Asadi
گروه شیلات، دانشکده منابع طبیعی دانشگاه تهران، کرج
author
text
article
2012
per
In this research, sludge characterization and rates of mineralization was evaluated in different sizes of rainbow trout (Oncorhynchus mykiss) in the culture systems. Four weight groups of fish (20±3; 50±5; 100±9; 200±10 gr) in triplicates were introduced and cultured in the experimental units (200 liter tanks) for a three day period. The fish were fed with a commercial dry feed pellete (Faradaneh Co.). The rates of mineralization due to the effect of natural flora (microorganisms) of bacteria on the produced sludge, was detected. In this respect, the fish captured and remainder sludge and the rate of macro and microelements recorded in all the treatments during a 7 day period. Concentration of TAN (Total Ammonia Nitrogen) and NO3-, shwoed significant differences among all treatments within initial day until the third day (p
Journal of Fisheries
دانشکده منابع طبیعی دانشگاه تهران
2008-5729
65
v.
3
no.
2012
339
352
https://jfisheries.ut.ac.ir/article_29496_f8f907e47303c88c96556d4c79716809.pdf
dx.doi.org/10.22059/jfisheries.2012.29496