The effect of hydrolyzed protein, vitamin E and oxidized oil on growth performance, hematology and fillet quality of rainbow trout (Oncorhynchus mykiss)
Esfandyar
Najafi
Ph.D student,Department of Fisheries Science, Faculty of Natural Resources, University of Tehran, Karaj, Iran.
author
Seyed Vali
Hosseini
Department of Fisheries and Environmental Sciences
Faculty of Natural Resources
College of Agriculture & Natural Resources,
University of Tehran, Karaj, Iran.
author
Hamid
Farahmand
professor, Department of Fisheries Science, Faculty of Natural Resources, University of Tehran, Karaj, Iran.
author
Bagher
Mojazi Amiri
professor, Department of Fisheries Science, Faculty of Natural Resources, University of Tehran, Karaj, Iran.
author
Mahdi
Soltani
professor, Department of Aquatic Animal Health, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
author
text
article
2021
per
Rainbow trout fish fed one of the diets containing fresh kilka oil with 50 mg kg-1 of vitamin E 1)without (control A, FO50) or 2)with hydrolyzed protein (4% replacement for fishmeal) (treatment B, FO50HP), 50 mg kg-1 vitamin E with oxidized oil 3)without (treatment C, OO50) or 4)with hydrolyzed protein (treatment D, OO50Hp), 250 mg kg-1 vitamin E with oxidized oil 5)without (treatment E, OO250) or 6)with hydrolyzed protein (treatment F, OO250HP) in a completely randomized design (six treatments and three replications) for eight weeks. The lowest FCR was in treatment B and the highest was in treatment E (P< 0.05). The amount of other growth indices were higher (P< 0.05) in treatments A and B than other treatments. The highest and lowest concentrations of alanin amino transferase (ALT) occurred respectively in treatment C and treatments A and B (P< 0.05), the highest and lowest concentrations of aspartate amino transferase (AST) occurred in treatments C and D and treatment B (P< 0.05), respectively. The highest neutrophil (Nut) and the lowest lymphosit (Lym) percentages were in treatment E while the vise versa were observed in treatment C (P< 0.05). The phagocytosis amount was highest in treatments C and D while it was the lowest in treatment A (P< 0.05). The fillet 14: 1n-9 concentration was the highest in treatment F while it was the lowest in treatment B (P< 0.05). The fillet 18: 0 content was the highest in treatment A and the lowest in treatment D (P< 0.05). Treatment D showed the highest fillet 20: 4n- 6 content while treatment F had the lowest content (P< 0.05). Accordingly, vitamin E (50 mg kg-1 diet) with hydrolyzed protein (as a substitute for fish meal by 4%) would be able to prohibit the damages resulting from oxidative stress in growing rainbow trout.
Journal of Fisheries
دانشکده منابع طبیعی دانشگاه تهران
2008-5729
74
v.
1
no.
2021
1
15
https://jfisheries.ut.ac.ir/article_80267_ca2af480d32143b0c2a2783fdc2528ad.pdf
dx.doi.org/10.22059/jfisheries.2021.316962.1221
The effects of linoleic to linolenic fatty acids ratios on growth performance, feed conversion ratio, visceral and hepatosomatic indices of three spot gourami (Trichopodus trichopterus) brooders
Salleh
Seifi berenjestanaki
PhD Student, Faculty of Animal Sciences and Fisheries, Sari Agricultural Sciences and Natural Resources University (SANRU), Sari, Iran
author
Abolghasem
Esmaeili Fereidouni
ssociate Professor, Animal Sciences and Fisheries Faculty, Fisheries Department, Sari Agricultural Sciences and
Natural Resources University (SANRU), Sari, Iran
author
Hossein
Oraji
Associate Professor, Animal Sciences and Fisheries Faculty, Fisheries Department, Sari Agricultural Sciences and Natural Resources University (SANRU), Sari, Iran
author
Naser
Agh
Associate Professor, Artemia Reference Center, Biology and Aquaculture Department, Urmia University, Urmia, Iran
author
text
article
2021
per
In this study, the effects of different inclusion levels of two fatty acids (linoleic/linolenic fatty acids; LA/LNA) including the ratios of control, 0.5, 1, 2, 4, and 8 were examined on growth performance, feed conversion ratio, and visceral and hepatosomatic indices in three spot gourami (Trichopodus trichopterus) over a 90-day culture period. The results showed that with increasing the LA/LNA ratio in the diet, no significant effects were observed on the condition factor and the average daily growth rate (p>0.05). The final body weight, total and fork lengths showed an increasing trend with increasing LA/LNA ratio (p<0.05); so that, the highest values were recorded in the ratio of 8 despite the lack of significant differences between the levels of 0.5 to 4. The highest percentages of weight and length increments were obtained in the ratio of 8, which showed a significant difference with other treatments (p<0.05); however, there were no significant differences in specific growth rate in body length and weight gains between treatments (p>0.05). The values of both visceral and hepatosomatic indices increased from the control group to a ratio of 2, but a significant decreasing trend was observed at levels with a ratio of 4 and 8 (p<0.05). The feed conversion ratio showed significantly better values in ratios 4 and 8 compared to other ratios (p<0.05). The monthly trend of specific weight growth rate in different treatments showed that treatments with ratios of 4 and 8 showed the higher growth rate in the third month compared to the second and first months of culture period. Based on the results and in order to produce farmed brooders, it can be suggested that the inclusion of 4 and 8 ratios of LA/LNA (in diets without fish oil) resulted in higher growth and nutritional performances in three-spot gourami fish.
Journal of Fisheries
دانشکده منابع طبیعی دانشگاه تهران
2008-5729
74
v.
1
no.
2021
17
30
https://jfisheries.ut.ac.ir/article_80269_7e8f6fda76cec4a934e755bb7e7882dd.pdf
dx.doi.org/10.22059/jfisheries.2021.315046.1214
Identification and Abundance of Macrobenthic in Estuary of the Gharehsou River
Somayeh
Jamani
Graduate student, Department of Fisheries, Faculty of Agriculture and Natural Resources,
Gonbad Kavous University, Gonbad Kavous, Iran.
author
Mohammad
Gholizadeh
Assistant Professor, Department of Fisheries, Faculty of Agriculture and Natural Resources,
Gonbad Kavous University, Gonbad Kavous, Iran.
author
Rahman
Patimar
Associate Professor ,Department of Fisheries, Faculty of Agriculture and Natural Resources, Gonbad Kavous University, Gonbad Kavous, Iran
author
Abolhassan
Fathabadi
Assistant Professor, Department of Rang and Watershed Management, Faculty of Agriculture and Natural Resources, Gonbad Kavous University, Gonbad Kavous, Iran
author
text
article
2021
per
The aim of this study was to investigate the abundance of macrobenthic and their relationship with environmental factors in the sediments of the Gharehsou River and Gorgan Bay. Abundance and distribution of macrobenthic in 12 stations and three regions of Gharehsou River and its estuary, the northern and southern coastal part and parallel to the estuary in the deep part of Gorgan Bay, were evaluated using a Van Veen grab in triplicates during 2018-2019 seasonally. In this study, a total of 4414 specimens of macrobenthic from including 3 phylum, 6 order and 12 families identified. The largest number of microbenthic belonged to Streblospio gynobranchiata (7.35%), then Tubificidae with 24.2%. The lower abundances were also included Pontoporeia affinis (0.05%) and Pontogammarus rubustoides (0.1%). Season of spring with 30% had the highest abundance compared to other seasons. Then the summer season with 29% and the autumn season with 25% were in the next frequency. The lowest frequency was related to winter with 16%. The highest diversity index was in station 4 and the lowest was in station 1. According to these results, it was concluded that the macrobenthic in obtaining and different places have a large limit on the abundance and diversity index. If you use these communities to influence the environment, you have to consider them natural.
Journal of Fisheries
دانشکده منابع طبیعی دانشگاه تهران
2008-5729
74
v.
1
no.
2021
31
43
https://jfisheries.ut.ac.ir/article_80270_69e3bae50333f04806ae92ad46efe5da.pdf
dx.doi.org/10.22059/jfisheries.2021.300109.1216
Population structure and dynamics of River Oriental Prawn (Macrobrachium nipponense) in three wetlands
(Alagol, Almagol and Ajigol) of Golestan province-northern Iran
Gholamali
Bandani
Instructor, Inland Waters Aquatic Stocks Research Center, Iranian Fisheries Science Research Institute, Agricultural Research, Education and Extension Organization, (IASRC), Gorgan, Iran
author
.
.
Associate Professor, Department of Fisheries, Faculty of Agriculture and Natural Resources, University of onbadKavous, GonbadKavous, Iran
author
Hojjatollah.
Jafaryan
Associate Professor, Department of Fisheries, Faculty of Agriculture and Natural Resources, University of GonbadKavous, GonbadKavous, Iran
author
Mohammadreza
Shokri
Assistant Professor, Faculty of Biological Sciences, ShahidBeheshti University, G.C., Evin, Tehran, Iran
author
hadi
raeisi
Assistant Professor, Department of Fisheries, Faculty of Agriculture and Natural Resources, University of
Gonbad Kavous, Gonbad Kavous, Iran
author
Zia
Kordjezi
Department of Fisheries, Faculty of Fisheries, Gonbad Kavous University
author
text
article
2021
per
Understanding the demographic characteristics of non-native species is very important for species and habitat management. The population structure and dynamics structure of river oriental prawn (Macrobrachium nipponense) were studied in three wetlands (Alma Gol, Alagol and Ajigol) of Golestan province, where the species is considered exotic species. A total of 6539 samples were collected and their biometric data recorded, the maximum total length of specimens ranged 90 -100mm. In this range, 4 age groups (0+,1+,2+and 3+) were identified. The growth parameters, obtained using von Bertalanffys growth function and Somer seasonal growth equation, were as L∞= 108 and 91 mm, K = 0.96/year and 0.98/year for males and females respectively. The lowest mortality rate was observed in age 1. The mean normal mortality rate for males and females was estimated to be M = 1.17 and M = 1.24, respectively. Total mortality rate, based on the length-converted catch curves equation, was estimated to be Z = 1.17 for males and Z = 1.17 for females. The total length at the first sexual maturity was estimated to be 46.9 mm for females and 52 mm for males. The optimum length for females was 64 mm, and for males was 76.8.
Journal of Fisheries
دانشکده منابع طبیعی دانشگاه تهران
2008-5729
74
v.
1
no.
2021
45
60
https://jfisheries.ut.ac.ir/article_80271_ab9c1ec63d7189850b456924f65234b4.pdf
dx.doi.org/10.22059/jfisheries.2021.313832.1212
Population structure analysis of largehead hairtail fish
(Trichiurus lepturus, Linnaeus 1758) in bottom trawl by-catch in Kolahi to Dargahan waters
Zahra
Masoomi
PhD student, . Department of Fisheries, Faculty of Marine Natural Resources, Khorramshahr University of Marine Science and Technology, Khuzestan Province, Iran
author
Mahsa
Haghi
Assistant Professor, Department of Fisheries, Faculty of Marine Natural Resources
Khorramshahr University of Marine Science and Technology
Khuzestan Province, Iran
author
Mohammad
Momeni
4- Assistant Professor, Persian Gulf and Oman sea Ecological research center, Iranian Fisheries Science Research Institute, Agricultural Research Education and Extension Organization (AREEO), Bandar Abbas, Iran.
author
Mohammad
Zakeri
Associate Professor, Department of Fisheries, Faculty of Marine Natural Resources, Khorramshahr University of Marine Science and Technology, Iran.
author
text
article
2021
per
< p >Large-head hairtail, Trichiurus lepturus, is one of the commercial fish at the Persian Gulf and Oman Sea waters, which is exploited to export outside markets. To present population dynamics and characteristics of this species, the fish caught by trawling method were analyzed from Kolahi to Dargahan areas in Hormozgan province waters. The von Bertalanffy growth equation (VBGF) was fitted to length-frequency data (n =771) to obtain a VBGF with the following parameters: L∞, K, and t0 were 88.83 cm, 0.10, and -0.07, respectively. The estimated value of total mortality (Z) and natural mortality (M) were 0.44 and 0.28 (year-1), respectively. Also, fishing mortality (F) was recorded as 0.16 year-1. Exploitation rate, corresponding to the maximum relative yield per recruit (E) was 0.36, and this fish in the present study caught capacity. Recruitment pattern showing maximum added yang fishes in September. The present results have to be considered with caution for fisheries management purposes as fishing effort is still in increasing phase. Long-term monitoring is required. To better understand the T. lepturus population dynamic and its fishery framework in the study region.
Journal of Fisheries
دانشکده منابع طبیعی دانشگاه تهران
2008-5729
74
v.
1
no.
2021
61
71
https://jfisheries.ut.ac.ir/article_80272_fe3df1501ee76d023a628dde744f25b7.pdf
dx.doi.org/10.22059/jfisheries.2021.314549.1213
Morphological variations, length-weight relationship parameters and condition factor of autumn and spring populations of Alburnus chalcoides (Gueldenstaedt, 1772) from Sefid and Siahdarvishan rivers in the southern Caspian Sea basin
Keyvan
Abbasi
Asistance Professor, Inland Waters Aquaculture Research Center, Iranian Fisheries Sciences Research Institute, Agricultural Research, Education and Extension Organization, Bandar Anzali, Iran.
author
Atta
Mouludi-Saleh
Department of Fisheries, Faculty of Natural Resources, University of Tehran, Karaj, Iran.
author
Soheil
Eagderi
Associate Professor, Department of Fisheries, Faculty of Natural Resources, University of Tehran, Karaj, Iran
author
nasrin
nikmehr
Ph.D, Department of Fisheries, Faculty of Natural Resources, University of Tehran, Karaj, Iran
author
text
article
2021
per
Morphological variations (morphometric and meristic traits), length-weight relationship parameters and condition factor were studied in autumn and spring populations of Alburnus chalcoides, collected from Sefid River (45 autumn and 113 spring) and Siahdarvishan (22 autumn and 28 spring) in the southern Caspian Sea basin. After anesthesia and fixation into the 4% buffered formalin, the samples were transferred to the laboratory and a total of 22 morphometric and 8 meristic characters were measured and counted using caliper and stereo-microscope, respectively. The results showed that the autumn and spring migratory populations of the studied species in the Sefid and Siahdarvishan rivers have significant differences in 7 and 2 morphometric traits (P<0.05), respectively, but not different in meristic characters (P>0.05). The results of the length-weight relationship parameters revealed that the Sefid River populations has an isometric growth pattern and the autumn and spring populations of the Siahdarvishan River showed positive allometric and isometric growth patterns, respectively.
Journal of Fisheries
دانشکده منابع طبیعی دانشگاه تهران
2008-5729
74
v.
1
no.
2021
73
83
https://jfisheries.ut.ac.ir/article_80273_be1c65007d6499636db40a4d0038ebfd.pdf
dx.doi.org/10.22059/jfisheries.2021.313779.1211
Antimicrobial activity of extract derived from
Pseudoalteromonas piscicida isolated from sea anemone
(Stichodactyla haddoni) against Aeromonas hydrophila
Neda
Fazeli
Ph.D student, Department of Biology, Faculty of Sciences, University of Guilan, Rasht, Iran
author
Akram Sadat
Naeemi
Assistant Professor, Department of Biology, Faculty of Sciences, University of Guilan, Rasht, Iran
author
Seyed Amir Hossein
Jalali
Assistant Professor, Department of Fisheries, Faculty of Natural Resources, Isfahan University of Technology, Isfahan, Iran
author
Hojjatolah
Zamani
Assistant Professor, Department of Biology, Faculty of Sciences, University of Guilan, Rasht, Iran
author
text
article
2021
per
Aeromonas hydrophila is one of the most important aquatic pathogens that cause fish losses and poor product quality in fish farms. The ability of Aeromonas hydrophila to form a biofilm makes this bacterium resistant to antibiotics. Hence, finding new antimicrobials with the potential to inhibit biofilm formation would be valuable. The aim of the present study was to evaluate the antibacterial and antibiofilm activity of the extract from Pseudoalteromonas piscicida, isolated from the sea anemone (Stichodactyla haddoni) against Aeromonas hydrophila. The Microdilution broth method was used to determine the minimum bactericidal concentration (MBC), and minimum inhibitory concentration (MIC) of Pseudoalteromonas piscicida extract. The anti-biofilm ability of this extract against formation of Aeromonas hydrophila biofilm was assessed using crystal violet staining method in 96-well plates. The results showed that the extract of Pseudoalteromonas piscicida inhibited the growth and biofilm formation of Aeromonas hydrophila at MIC=MBIC= 200 mg/ml. In addition, using physical and chemical treatments, it was shown that the active compounds are mainly proteinous in nature and are proteases. The results from the experimental challenge of zebrafish (Danio rerio) with the pathogen demonstrated that oral administration of Pseudoalteromonas piscicida extract in two safe doses of 200 and 400 mg mL-1 increased survival rates of the fish and decreased colonization of Aeromonas hydrophila in their intestine within 7 days. The results of the present study showed that Pseudoaltromonas picisidia extract contains bioactive compounds with antibacterial and antibiofilm ability against Aeromonas hydrophila and due to its low toxicity in fish, if purified, it can be a good alternative to antibiotics.
Journal of Fisheries
دانشکده منابع طبیعی دانشگاه تهران
2008-5729
74
v.
1
no.
2021
85
96
https://jfisheries.ut.ac.ir/article_80274_5155360b9c4f495315c01f467be56229.pdf
dx.doi.org/10.22059/jfisheries.2021.312541.1207
Histopathological effects of aflatoxin B1 and zearalenone on liver tissue of rainbow trout (Oncorhynchus mykiss)
Hamed
Ghafarifarsani
Ph.D student, Department of Biology, Faculty of Sciences, University of Guilan, Rasht, Iran
author
Ahmad
Imani
Urmia University, Faculty of Natural Resources, Dept. of Fisheries
author
Theo
Niewold
Nutrition and Health Unit, Department of Biosystems, Faculty of Bioscience Engineering, Heverlee, KU Leuven
author
Constanze
Pietsch-Schmied
Institute of Natural Resource Sciences (IUNR), Zurich University of Applied Sciences (ZHAW), Grüental, P.O. Box, 8820, Wädenswil
author
Kourosh
Sarvi moghanlou
Urmia University
author
text
article
2021
per
The aim of this study was to evaluate the histological effects of aflatoxin B1 (AFB1) and zearalenone (ZEA) on the liver tissue of the rainbow trout. In this study, 540 rainbow trout 12.07±0.23 g (Mean±SD), as 9 experimental treatments with three replications were fed separately and simultaneously with diets containing different concentrations of AFB1 and ZEA over 60 days. In this regard, the concentrations of 50 and 100 ppb AFB1 and 300 and 600 ppb of ZEA were used. At the end of the experimental period, the liver tissue was sampled and pathological changes were qualitatively and semi-quantitatively examined. The toxin-induced histological damage included necrosis and deformation of hepatocytes. The severity of tissue lesions increased with increasing dietary levels of AFB1 and ZEA separately and simultaneously. The results showed that the severity of lesions was higher in fish receiving diets containing combinations of AFB1 and ZEA in comparison to other treatments.
Journal of Fisheries
دانشکده منابع طبیعی دانشگاه تهران
2008-5729
74
v.
1
no.
2021
97
106
https://jfisheries.ut.ac.ir/article_80275_914f375dd1868f3d0e094adf0d374d17.pdf
dx.doi.org/10.22059/jfisheries.2021.317750.1224
Effect of heavy metals on the antioxidant compounds of Monoraphidium and Scenedesmus microalgae
parichehr
hanachi
Associate Professor, Department of Biotechnology, Faculty of Biological Sciences, Alzahra University, Tehran, IRAN
author
Asiyeh
Aghababaei
Msc. Student, Department of Biotechnology, Faculty of Biological Sciences, Alzahra University, Tehran, IRAN
author
Mostafa
Noroozi
َAssistant Professor, Department of Biotechnology, Faculty of Biological Sciences, Alzahra University, Tehran, Iran.
author
Roshanak
Zarringhalami
Assistant Professor, Department of Biotechnology, Faculty of Biological Sciences, Alzahra University, Tehran, IRAN
author
text
article
2021
per
Microalgae are one of the rich sources of antioxidant compounds with health benefits. The synthesis of such compounds in microalgae cells can be increased under stress conditions. The aim of this study was to investigate the effect of heavy metals on antioxidant compounds production. For this purpose, both Monoraphidium and Scenedesmus strains were first cultured in BBM medium and after reaching the appropriate growth, they were treated with mercury chloride under stress conditions. Total antioxidant activity was measured by FRAP and DPPH methods, also photosynthetic pigments and superoxide dismutase activity were examined. The growth rates and the amount of antioxidant compounds decreased in both Monoraphidium and Scenedesmus microalgae under different concentrations of mercury chloride stress. However, the activity of superoxide dismutase increased while mercury chloride concentration increased. The results of this study showed that by removing heavy metals from algae medium, a suitable environment is provided to increase the specific compounds and these microalgae compounds cab be used in the pharmaceutical, medical and food supplements industries.
Journal of Fisheries
دانشکده منابع طبیعی دانشگاه تهران
2008-5729
74
v.
1
no.
2021
107
118
https://jfisheries.ut.ac.ir/article_80276_b5e5e7696c28d0f2e1d11f0931c1e2a2.pdf
dx.doi.org/10.22059/jfisheries.2021.318063.1226
Initial feeding of Persian sturgeon (Acipenser persicus) with various live foods on growth parameters, survival, carcass analysis and fatty acids profile in adaptation to artificial feed using chironomide
Iraj
Efatpanah
PhD student, Fisheries Department, Faculty of Natural Resources, University of Guilan, Sowmeh Sara, Guilan, Iran
author
Bahram
Falahatkar
Professor, Fisheries Department, Faculty of Natural Resources, University of Guilan, Sowmeh Sara, Guilan, Iran
author
Mirmasoud
Sajjadi
Professor, Department of Marine Sciences, The Caspian Sea Basin Research Center, University of Guilan, Rasht, Guilan, Iran
author
Maryam
Monsef Shokri
Assistant professor, International Sturgeon Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Rasht, Iran
author
text
article
2021
per
The aim of this study was to use chironomide as a food in transition to accustom this fish to dry feed and its effect on growth indices, survival, fatty acid profiles and carcass analysis. In order to do the experiment, first, Persian sturgeon larvae were reared for 11 days from the beginning of active feeding with 4 treatments including: 1 (Artemia + Daphnia), 2 (Artemia only), 3 (Artemia + chironomide) and 4 (chironomide only) and in the second stage for transition to the formulated diet, 300 pieces of Persian sturgeon were reared with 3 replicates over 21 days using chironomide and formulated feed. Final weight, growth rate, and feed efficiency were significantly higher in treatment 4 than the other treatments. Specific growth rate and body weight increase in treatment 4 were higher than the other treatments. Feed conversion ratio in treatment 4 was the lowest . The crude protein in the Artemia-fed treatment was higher than the Artemia + Daphnia-fed treatment. Fat and ash contents in the treatment fed with chironomide was higher than the fish fed with Artemia + Daphnia. Analysis of larvae at the end of the first stage showed the effect of live food on fatty acids profile in different treatments (P < 0.05). However, in the adaptation to dry feed, the results changed and no significant differences were observed among the treatments. This study showed that the use of chironomide in the diet of Persian sturgeon at the start of feeding up to the adaption period can increase the DHA/EPA ratio, conversion of short-chain unsaturated fatty acids to long-chain, resulting in an increase in the ratio of n-6 to n-3, as well as more fat absorption in the body and increases growth indices and survival rate in this stage.
Journal of Fisheries
دانشکده منابع طبیعی دانشگاه تهران
2008-5729
74
v.
1
no.
2021
119
137
https://jfisheries.ut.ac.ir/article_80294_8066451cd6864b846fd09ed964cfb6b0.pdf
dx.doi.org/10.22059/jfisheries.2021.315468.1215
Assessment of habitat suitability of the River brown trout
(Salmo trutta fario) in Chalous River using generalized linear model
Rahmat
Zarkami
Associate professor, Department of Environment science, Faculty of Natural Resources, University of Guilan, Sowmeh Sara, Guilan, Iran
author
Rahmat
Zarkami
MSc student. Department of Environment science, Faculty of Natural Resources, University of Guilan, Sowmeh Sara, Guilan, Iran
author
Mortza
Saharkhiz
MSc. Chalous environmental protection bureau, Guilan, Iran
author
text
article
2021
per
The River brown trout (Salmo trutta fario) is one of the freshwater fish species that is endangered in Iran due to overfishing, habitat destruction and demolation of special substates for spawning. Three sampling sites were considered from different parts of Chalous River (upstream, middle and downstream of river) to predict the habitat suitability of the River brown trout. A set of environmental variables (physico-chemical and structural variables) was monthly sampled at each sampling site (in total 19 variables). The environmental variables were simultaneously colledted with the presence/absence of the river trout (12 samples presence and 24 samples absence) during one-year study period (2017-2018). Based on the prediction of the generalized linear model, there was a significant difference between the presence and absence of fish in the sampling sites regarding all the environmental factors (after excluding the variables with high correlation) (p< 0.01). The results of the model showed that increase of the water flow velocity, river depth and dissolved oxygen concentration (especially in the upper part of the river) may increase the probability of fish presence in the river. In contrast, increasing physical and structural variables such as water temperature, the river width and the distance from the source and also increasing the concentration of water quality variables such as salinity, nutrients (such as nitrate and phosphate), chemical oxygen demand and suspended solids gradually might decrease the presence of fish.
Journal of Fisheries
دانشکده منابع طبیعی دانشگاه تهران
2008-5729
74
v.
1
no.
2021
139
152
https://jfisheries.ut.ac.ir/article_80295_03990f1faebe34a00d3568c56baa757d.pdf
dx.doi.org/10.22059/jfisheries.2021.317271.1222
Alterations in growth indices and body composition of goldfish (Carassius auratus) fed on diets contaminated with different levels of Aflatoxin B1 and Zearalenone toxins
SOLEYMAN
HASSANPOUR
Ph.D. Student, Department of Fisheries, Faculty of Agriculture and Natural Resources, University of Urmia, Urmia, Iran.
author
Kourosh
Sarvi moghanlou
Associate Professor, Department of Fisheries, Faculty of Agriculture and Natural Resources, University of Urmia, Urmia, Iran
author
mazdak
razi
associate Professor, Department of Comparative Histology and Embryology, Faculty of Veterinary Medicine, Urmia University
author
Ahmad
Imani
Associate Professor, Department of Basic Science, Faculty of Veterinary Medicine, University of Urmia, Urmia, Iran
author
text
article
2021
per
The purpose of this study is to investigate the effects of aflatoxin B1 and zearalenone in regards to changes in growth indices and body composition of gold fish. For this purpose, 675 juvenile fish weighing approximately 6.25±0.12 grams in the form of 9 experimental treatments with diets containing three levels of Aflatoxin B1 (AF) (0, 50 and 100 ppb) and three levels of Zearalenone (ZER) (0, 500 and 1000 ppb) and they were fed for 60 days. Then, growth indices and body composition were measured. Based on the results, the weight gain in juveniles fed diets containing AF50 with ZER1000 andAF100ZER1000 (treatments 7 and 9) decreased compared to the control group (p<0.05). Groups fed with diet containing AF50, AF100ZER500, and AF100ZER1000 showed lower weight gain (p<0.05). Specific growth rate at levels of AF50, AF100, ZER1000 and combination treatments of two toxins had a significant decrease compared to the control group (p <0.05). Although there was no significant difference between treatments in indices of feed conversion ratio, the lowest value was observed in the group without toxin (treatment 1) and the highest value was observed in treatment 9 (AF100ZER1000) (p >0.05). The lowest body protein was observed in treatment 6 (AF50ZER500) (p <0.05). Also, the lowest body fat was observed in treatment 4 (ZER500) (p <0.05). The lowest moisture was observed in treatment 7 (AF50ZER1000) (p <0.05). It can be concluded that both Aflatoxin B1 and Zearalenone alone, reduce growth indices and changes in body composition, but the simultaneous presence of two toxins has the greatest effect on these indices.
Journal of Fisheries
دانشکده منابع طبیعی دانشگاه تهران
2008-5729
74
v.
1
no.
2021
153
163
https://jfisheries.ut.ac.ir/article_80296_502ffd987e72c881eda19f1b72e2bbbf.pdf
dx.doi.org/10.22059/jfisheries.2021.318417.1229