فهرست مطالب

  • Volume:7 Issue:2, 2019
  • تاریخ انتشار: 1398/04/20
  • تعداد عناوین: 8
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  • Ali Taheri Mirghaed*, Marzieh Abbasi, Seyyed Morteza Hoseini, Esmaeil Pirali Kheirabadi Pages 65-70
    Environmental pollutants are potentiate to disturb biological processes such as metabolism, growth and reproduction of aquatic organisms. These compounds are able to cause gonadal abnormalities, biased sex ratios and alteration in reproductive physiology in fish. The aim of this study was to examine plasma 17β-estradiol (E2) and alkali-labile phosphoprotein (ALP) levels in male and female Tench (Tinca tinca) from a polluted (the Anzali Wetland) and a non-polluted environments (the Amirkolayeh Wetland). Samples were collected over the maturation season of Tench between May and June 2017. The results revealed significant difference in mean ALP and E2 between genders in the polluted environment. However, the mean plasma ALP concentrations in male Tench of the polluted environment (39.46±1.02 µg/ml) was 45% of the average recorded in female (86.18±2.25 µg/ml) and was two times higher than the amount measured in males in the non-polluted environment (18.68±0.35 µg/ml). High concentrations of E2, were detected in the male samples from the Anzali Wetland. Mean plasma E2 concentrations for male in the Anzali Wetland was almost two times higher than male in the Amirkolayeh Wetland. The results indicate that the reproductive physiology of Tench was affected by contaminants found in the Anzali Wetland, a highly polluted area.
    Keywords: ALP, Anzali Wetland, Steroid hormone, Tinca tinca
  • Simon Buhungu*, Marcel Donou, Gaspard Ntakimazi, Clément Agossou Bonou, Elie Montchowui Pages 71-84
    The objective of this study is to determine the zooplankton species that characterize the Kinyankonge River basin in Burundi. Thus, zooplankton was sampled monthly over a period of 18 months (from July 2015 to June 2016, then from January 2017 to June 2017) at seven stations. The Indicator Value (IndVal) of the identified zooplankton species and the coverage of stations were determined. The results showed that three species characterized significantly the most upstream station whereas the water of the irrigation channel was characterized by 4 species. The waters of the Nyabagere tributary and the wastewater treatment plant are characterized by 1 and 5 species, respectively. Furthermore, the dry season was characterized by 4 singletons and 13 pairs of species, while the rainy season was characterized by 11 pairs of species. Moreover, the group of upstream stations was characterized by 5 species while 3 species characterized the group of downstream stations. These species highlighted by the indicator value method can be used to characterize stations in the Kinyankonge River and provide information on seasonal changes.
    Keywords: Zooplankton, Characteristic species, Indicator value, Kinyankonge
  • Sajjad Karimi*, Elham Katiraei, Nasrollah Mahboobi Soofiani, Seyed Aminollah Taghavimotlagh, Amir Vazirizadeh Pages 85-92
    Feeding habits of Pomadasys stridens were studied in northern part of the Persian Gulf. A total of 591 specimens were collected from the coastal water of Bushehr Province using trawl boats from May 2012 to April 2013 and diet composition, feeding intensity and season changes in diet composition were investigated. Vacuity Index was 81% during the study. RGL was 0.98±0.03 classifying this species as carnivorous to omnivorous fish. Pomadasys stridens had consumed 48 different food categories in 7 taxonomic classes. Crustacean, Mollusca, foraminifera, nematodes, Echinodermata, Annelida and miscellaneous were the main observed food items. There was no significant difference between males and females regarding diet composition in different months.
    Keywords: Food, Diet composition, Feeding intensity
  • Mohammad Reza Mirzaei*, Pedram Hatami, Seyed Abbas Hosseini Pages 93-96
    This study aimed to assess the biomass and catch per unit area (CPUA) of demersal fish resources in the northern part of the Oman Sea based on trawl survey. The study area was stratified into five stratum (I, II, III, IV and V) covering the depth layers of 10-20, 20-30, 30-50 and 50-100 m. A total number of 68 stations were monitored during the study period. The highest values of biomass were belong to stratum V and IV in the east coast of the Oman Sea and the highest species biomass was belong to batoid fishes (8054.4 tons). The lowest CPUA was recorded in the central region of the study area (stratum III, approximately 8212 kg/nm2) and the highest CPUA was on both sides of the study area (the east and west coast). Moreover, the highest CPUA (2031 kg/nm2) was observed in 20-30 m depth layer. The results showed the changes in biomass and CPUA based on different depths and the most abundant species groups were Trichiurus lepturus (50-100 meter), Sphyraena jello (30-50 meters), Caranx ignobilis (20-30 meters), and Pomadasys kaakan (10-20 meters).
    Keywords: Biomass, Demersal fish, Catch Per Unit Area, Oman Sea
  • Odgerel Bumandalai*, Rentsenkhand Tserennadmid Pages 95-99
    Although inorganic fertilizers are known to raise environmental and health problems, the current agricultural practices are heavily dependent on the application of synthetic fertilizers and pesticides. In this study, we examined the effect of Chlorella vulgaris strain on germination of tomato and cucumber seeds. Seeds were germinated in culture medium containing algal strain and grown for 3, 6, 9 and 12 days to study its effect on growth parameters. As results, C. vulgaris suspension increased the seed growth compared to those of the control (sterilized culture medium) of seed germination. The best treatments were 0.17 and 0.25 g/L of algal suspension for the root and shoot lengths of tomato and cucumber seeds, respectively.
    Keywords: Biofertilizer, Germination, Algae, Crop
  • Gangbé Luc, Achoh Mardochée Ephraim*, Aboudou Zouberou Aboudou, Hounhoedo Aimé, Agbohozo Buenas, Aizonou Romaric, Agadjihouèdé Hyppolite Pages 100-105
    Controversies on the performance of the tilapia strain Oreochromis niloticus (S2 INRAB, SI), led us to be interested to the evaluating of that strain’s growth in comparison with the strain commonly used by the fish farmers named Faizou’s strain (SF). Fry of average weight 10.17±2.0663 g were stocked in concrete tank (density: 10 individuals/m2). The experiment lasted 60 days where the temperature, oxygen-dissolved and pH parameters were measured morning and evening every 48 hours. The feed used was made from local products at protein level of 45%. The results revealed that physicochemical parameters have no negative influenced on fish growth even though they were significantly different from one strain to another. The gain in weight obtained was significantly higher for the strain SF (38.12±5.65 g) than the SI (37.15±4.99 g) despite it recorded 13.33% more mortality than the SI strain. Above of this, the average daily gain (ADG) of the SF strain was almost linear over the entire study period, unlike the SI strain whose has no linear ADG. It shows that the SF strain is more productive despite the recorded mortality. This confirms the fish farmers’ claims on the lowest growth of the SI strain, which however is to be considered in selection and breeding programmes.
    Keywords: Tilapia, Strain, Zootechnical Performance, Local feed
  • Ensieh Salehghamari*, Zohre Nasrollahzadeh, Mohammad Tahmaseb, Mohammad Ali Amoozegar Pages 106-111
    Aquatic saline ecosystems are suitable environments for isolation of microorganisms with high diversity and widely used biotechnology features. The pectinase enzyme is one of the most important commercial enzymes with high potential in food and pharmaceutical industries. Therefore, the discovery of microorganisms with new characteristics has always been a focus of research. As such, a pectinase producing actinomycete Streptomyces coelicoflavus GIAL86 was isolated from Meyghan Salt Lake of Arak located in Markazi Province of Iran. This strain was screened among 35 isolates of halotolerant actinomycetes with the highest production of pectinase enzymes. It was also found that production of pectate lyase, pectin esterase and polygalacturonase increased simultaneously with the logarithmic growth of the strain and its maximum production is at the time of stationary phase beginning. Also, some actinomycete strains with more pectinase activity were identified by molecular identification and their phylogenic relationships were investigated.
    Keywords: Actinomycete, Halotolerant, Pectin methyl esterase, Pectate lyase, Poly galactoronase
  • Ali Reza Radkhah, Soheil Eagderi*, Hadi Poorbagher Pages 112-116
    The Caspian Sea basin is one of the most important inland water basin of Iran having the most diverse inland water fishes. The present study aimed to review the book entitled "Fish of Guilan'' by Keyvan Abbasi Ranjbar published in 2017. This book provides general and biological information of the reported fishes in Guilan Province that can be used as a reference and identification key by fishermen and researchers who are involved in aquaculture, fisheries and biology.
    Keywords: Caspian Sea, Diversity, Guilan, Inland waters