Production of protein isolate and surimi from silver carp (Hypophthalmichthys molitrix) and survey their gel and powder colorimetric and chemical parameters
M.
Azadian
author
M.
Moosavi-Nasab
author
A.R.
Yousefi
author
text
article
2011
per
The purpose of this study was production of fish protein isolate and surimi from silver carp
(Hypophthalmichthys molitrix) and survey of color characteristics as well as chemical changes
of gel and powders of those products. In this research, proteins were isolated using pH shifts
method. Acidic pH (2.5 and 3.5) and basic pH (11 and 12) were used to produce fish protein
isolate. Three steps of washing cycles were used for surimi production, and in the third step
0.2% NaCl was used for more dehydration. Results showed that the product efficiency for fish
protein isolate was significantly more than the surimi. Furthermore, the produced fish protein
isolate using acidic pH had the highest production efficiency amongst the samples. As a
result, fish protein isolate had more recovery protein content compared to surimi.
Determination of fat content of the samples showed that surimi contained significantly lower
reduction in fat compared to fish protein isolate. Investigation and comparison of color
characteristics (L, a, b) attributed to gel and powder forms of the samples demonstrated that
the produced fish protein isolate using pH 2.5 had the most intense lightness (L parameter)
amongst the other samples. This study clearly showed that the production efficiency of fish
protein isolate was higher than surimi. In addition, due to the process of surimi production,
fish protein isolate had more protein content. The higher reduction of fat content of fish
protein isolate can be considered as an advantage because of possible increase in durability
and safety of the products.
*Corresponding author
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
20
v.
3
no.
2011
1
10
https://isfj.areeo.ac.ir/article_110002_21b38548c15ee553770788481ce4fd3b.pdf
dx.doi.org/10.22092/isfj.2017.110002
Optimizing the technique for replacement of unicellular algae with agricultural by-products in feeding Artemia urmiana and parthenogenetic Artemia
E.
Ownagh
author
N.
Agh
author
F.
Noori
author
text
article
2011
per
In order to assess the maximum replacement possibility of unicellular green algae with
cheap food sources for feeding Artemia, two strains of Artemia urmiana and parthenogenetic
Artemia were fed under laboratory condition using wheat bran, soybean meal and 50/50%
mixed diet of wheat bran/soybean, each in 12 different concentrations together with different
rations of Dunaliella salina for 15 days. The results were compared with those fed only on
algae D. salina as control group. At the end of the experiment, control groups in each two
strains (with 9.11mm growth and 86.25% survival in A. urmiana and 8.55mm growth and
85% survival in parthenogenetic Artemia) had almost the best condition. In A. urmiana
treatments 95.8-88% replacement for algae of wheat bran, treatment 94% replacement for
algae of soybean and treatments 97-94% replacement for algae of mixed wheat bran/ soybean
showed no significant differences with control in both growth and survival. In
parthenogenetic Artemia treatments 94-82% replacement for algae of wheat bran, treatments
91-88% replacement for algae of soybean and treatments 91-82% replacement for algae of
mixed wheat bran/soybean showed no significant differences with their control in both growth
and survival. According to the results, it seems that single-cell algae and their production
requires exorbitant spending and personnel which can be replaced with easily affordable
agricultural wastes, without need to specialized staff.
*Corresponding author
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
20
v.
3
no.
2011
11
22
https://isfj.areeo.ac.ir/article_110003_a8248a9d1e9898705defa21490a60a62.pdf
dx.doi.org/10.22092/isfj.2017.110003
Study of existing biological communities in Hormuzgan province waters (Persian Gulf) for installation of artificial reefs
S.
Behzadi
author
A.
Salarpouri
author
M.
Darvishi
author
B.
Daghoghi
author
Sh.
Siead Moradi
author
H.
Rameshi
author
text
article
2011
per
To determine the suitable locations for installation of artificial reefs we studied Persian Gulf
waters (Hormuzgan province) from December 2006 to March 2007 seasonally. The area was
stratified to 10 transects and each transect was divided to three layers and used random
sampling method. Habitats of fauna and flora including: Communities of corals, seaweeds, sea
cucumbers and sea grasses, and sedimentation depth using SCUBA diving method were
studied in each transect and layer. Sea grass communities existed in some places with below
10m depth of Bandar Mesan, Bandar Kang, Kish Island and Bandar Chirooyeh transects. Also,
seaweed habitats were seen in Bandar Mesan and some areas in Bandar Lengeh and Kish
Island in 10-20m depth transect. The study of coral and sea cucumber communities indicated
presence of Acropora sp. habitats in Bahman jetty, Bandar Mesan and Bandar Bostaneh
transects , and Porites sp. habitats in Hengam island transect, Holothuria sp. habitats in
Bandar masen and Bandar Lengeh transects and Stichopus sp. habitat in Hengam Island
transect. All these species were found in shallow waters bellow 10 meters depth and showed a
patchy distribution. Sedimentation depth results showed a statistically significant difference
between layer
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
20
v.
3
no.
2011
23
32
https://isfj.areeo.ac.ir/article_110004_dbd29355738e7c9434d3ae222cc29ac3.pdf
dx.doi.org/10.22092/isfj.2017.110004
Physicochemical and sensory quality changes of surimi from silver carp (Hypophthalmichthys molitrix) in frozen storage at -18ºC
S.H.
Jalili
author
A.
Hamrang Omshi
author
text
article
2011
per
The physicochemical and sensory quality changes of silver carp (Hypophthalmichthys
molitrix) surimi were studied during three months at frozen storage (-18ºC). The results
showed that with increasing storage time of surimi from silver carp, TVB-N, peroxide value
(PV) and expressible moisture increased significantly. TVB-N increased from 10±1 to
16.80±1.4mg%, Peroxide value from zero to 2.76±0.85meqO2/kg and expressible moisture
from 4.23±0.13 to 6.32±0.13% during three months at frozen storage. Quality score of
sensory evaluation, folding test and biting test were significantly decreased during storage
period. Quality score of produced surimi gel decreased from AA to A, C grade and biting test
decreased from 8.58±0.98 to 5.25±1.86. The results indicated that in spite of increasing of
TVB-N, PV, expressible moisture and decrease of sensory quality score, folding test and
biting test of silver carp surimi, the samples were between allowed limits and acceptable after
three months at frozen storage.
*Corresponding author
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
20
v.
3
no.
2011
33
44
https://isfj.areeo.ac.ir/article_110005_d4adfa6f2de62688f83e17b2f5b72766.pdf
dx.doi.org/10.22092/isfj.2017.110005
Genetic variation of Metapenaeus affinis in Persian Gulf coastal waters using microsatellite markers
M.
Shokoohmand
author
H.
Zolgharneen
author
F.
Laloei
author
A.M.
Fooroghmand
author
A.
Savari
author
text
article
2011
per
Genetic diversity of Metapenaeus affinis population from the northern coasts of the Persian
Gulf (Bahrakan, Lifeh-Boosiaf) was studies using microsatellite markers. During September
to October 2007, 60 samples of pleopods tissue of the shrimp were taken and genomic DNA
was extracted by acetate method. PCR was performed on microsatellite primers. To measure
fragment size, samples were run on an 8% polyacrylamid gel. For each microsatellite locus,
using genetic software, Pop Gene and Gene Alex, allele frequency, real and expected
heterozygosity, Fst and Rst and other relevant factors were measured. Of the obtained 5 paired
microsatellite primers, all were polymorphic. The mean observed and effective alleles number
was 7 and 3.67, respectively and also the mean observed and expected heterozygosis was 0.27
and 0.66, respectively. It was also seen that specimens from all regions were not in Hardy-
Weinberg Equibrium in all of the loci. Based on the analysis of molecular variance
(AMOVA) Fst, Rst and Nm were 0.107, 0.372 and 2.092, respectively. The highest genetic
distance was 0.571 and the lowest was 0.561. The present study showed that two different
populations of Metapenaeus affinis are living in the Bahrakan and Lifeh-Boosiaf region
northwest coasts of the Persian Gulf.
*Corresponding author
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
20
v.
3
no.
2011
45
54
https://isfj.areeo.ac.ir/article_110006_b47ce7dca948f097a7599c3b2a193543.pdf
dx.doi.org/10.22092/isfj.2017.110006
Effects of Diazinon concentrations on LC50, hematocrit and clinical signs of Roach Torkemani (Rutilus rutilus caspius) fries of Caspian Sea
M.
Sheikh
author
A.M.
Hajimoradloo
author
R.
Ghorbani
author
M.
Mollaei
author
A.
Khodanazary
author
text
article
2011
per
Effects of different concentrations of Diazinon on Roach Torkemani (Rutilus rutilus caspius) fries
supplied from Ghareh-Soo Fishery Research Station was studied in Gorgan University of Agricultural
Science and Natural Resources in 2009 to determine 50% lethal concentration (LC50) for the fish
within 96 hours. In this study, 126 Roach fries with mean weight of 3 grams were used. Tests were
performed statically based on instructions of O.E.C.D under fixed water quality conditions at the
temperature 24±1 and pH 8-8.5 in a completely random trial with five concentrations treatments of
Diazinon (5, 5.95, 7.07, 8.48 and 10mg/l) in three replications and the means were compared using
Duncan test at 5% significance level. The results indicated that at the end of 96-hour test, LC50 was
7.88mg/l. In this test, clinical signs such as hunched spinal column, thrilling, clot in caudal fin and
head, and irregular swimming were observed in the studied fish specimens. In hematological
examination, there was a remarkable decrease in percent of hematocrit between concentrations of 5
and 5.95mg/l of Diazinon. By increasing the concentration of this poison, the decrease became slower.
Furthermore, there was a significant difference in percent of hematocrit between control group and
LC50 group, with mean amounts of 36 and 27%, respectively. Based on the results, Diazinon was
classified as toxic pesticide for Roach Torkemani.
*Corresponding author
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
20
v.
3
no.
2011
55
62
https://isfj.areeo.ac.ir/article_110007_9fc4c715ee8b318ec635548d40abc59a.pdf
dx.doi.org/10.22092/isfj.2017.110007
Effect of replacement of Caspian Sea gammarus meal by partial kilka fish meal on growth performance, feed conversion ratio and survival of juveniles of rainbow trout (Oncorhynchus mykiss)
A.
Azimi
author
S.A.
Hosseini
author
M.
Sudagar
author
H.
Aslanparviz
author
text
article
2011
per
The effects of using different of gammarus meal levels (0, 5, 10 and 20%) instead of kilk
fish meal as a protein source on growth performance, feed conversion ratio and survival of
rainbow trout (Oncorhynchus mykiss) fingerlings were studied over 8 weeks. Rainbow trout
fingerlings (mean body weight 5.48 ± 0.32g) were reared in a completely randomized design
with three replications in the same conditions. Based on the results, no significant difference
was observed in the final length and weight and specific growth rate among treatments.
Increase of gammarus meal in diet led to increase of feed conversion ratio and decrease of
survival, but the difference was not significant among treatments. Commercial analysis
showed that the cost price of feed increased with increase of gammarus meal in diet,
significantly. Thus, results of our study showed that adding up to 10% of gammarus meal
instead of kilka fish meal in rainbow trout fingerlings diet is suitable, considering gammarus
abundance in the shores of south Caspian Sea and lack of significance in difference on
growth, feed conversion ratio and survival.
*Corresponding author
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
20
v.
3
no.
2011
63
74
https://isfj.areeo.ac.ir/article_110008_8b2e5c2821b7defe5a7b3bc6baa4e414.pdf
dx.doi.org/10.22092/isfj.2017.110008
Study on moving direction and survival index of Persian sturgeon (Acipenser persicus) fingerlings using mark-recapture method in Caspian Sea (Guilan province coasts)
B.
Fadaee
author
B.
Younes Haghighi
author
text
article
2011
per
To study moving direction and survival index of Persian sturgeon fingerlings, a total of
390200 individuals of the fish in three weight classes: less than 3g, 3 to 5g and 6 to10g were
marked by coded wire tags (CWT) during 2003 to 2008. In 2003, 101500 of these individuals
were marked in Shahid Beheshti, Shahid Rajaee and Shahid Marjani Sturgeon Rearing
Centers, in north of Iran and then released in Sephidrud, Tajan and Gorganrud rivers. During
2004 to 2008, 288700 pieces were marked by Shahid Beheshti Rearing Centers and released
in Sephidrud River. Catch and detection of fingerlings carried out by gill net prepared from
nylon with mesh sizes 22, 26, 33 (2 filaments for each mesh) and one 40mm mesh size.
Totally, 175 meters of net was used to study fishes in waters under 10m depth in Guilan
province. In all, 2827 pieces of this fish were caught of which 40 had CWT and these
belonged to weight classes 6-10g (22 pieces), 3-5g (17 pieces) and under 3g (one piece).
Results on release and catch of the fingerlings for Sephirud River showed that more than 70%
of fingerlings moved to eastern parts of the estuary and eastern coasts of Guilan province
(stations like 12 Bahman, Dastak and Chaboksar). Of the fingerlings released in Gorganrud
and Tajan rivers, only one piece was caught in Chaboksar and another in Lisar after 15
months. Hence, we postulated that the fingerlings released in Mazandaran and Golestan
provices migrated to Guilan province coasts. Statistical analysis of the survival index in
different weight classes indicated that the class 6-10g had higher survival rate, twice than
class 3-5g and 20 times more than that of the class under 3g. Considering these results,
probably the higher weight at release time can be effective in increasing the survival rate of
the Persian sturgeon fingerlings.
*Corresponding author
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
20
v.
3
no.
2011
75
86
https://isfj.areeo.ac.ir/article_110009_d191706533644970f45dbab03067d5dc.pdf
dx.doi.org/10.22092/isfj.2017.110009
Replacing of live food with artificial diet on growth and survival rates of white leg shrimp (Litopenaeus vannamei) larvae
R.
Ghorbani Vagheie
author
A.
Matinfar
author
Kh.
Aeinjamshid
author
M.
Hafezieh
author
R.
Ghorbani
author
text
article
2011
per
Replacing live food with artificial diets in aquatic larviculture, especially in shrimp larvae
not only is caused convenience feeding, but also in economical view is very important. With
this object, in this survey, a density of 100.L-1 white leg shrimp larvae in 9 nutritional
treatments each with three replicates were cultured in 20L tanks each one was held with 10L
of 30% salty water using one air stone. The larvae were fed 4 times.day-1 with different diets,
including live foods (Cheatoceros gracilis and Artemia nauplii), artificial diets (handmade
and imported) and different combinations. The results showed that the growth rate and
survival percentage in larvae fed with combination feed treatments, were more desirable than
those fed with food and feed treatments and feeding with homemade and imported feeds
alone, raised high mortality in shrimp larvae during the experiment. Also, it was denoted that
even if the zoea larvae has been fed with live food, feeding with 100% artificial diets for the
resting larviculture period won't be possible because of decreasing significantly in growth
rate, total length and survival percent of shrimp larvae, compare to the other treatments. In
addition, replacing partly of live food with artificial diet without adverse affects on growth
and survival rates of white leg shrimp larvae will be possible and the observation supported
that the handmade feed with given formulation, had more suitable results comparing to the
imported one for mixing with live food economically. Therefore, we recommend that a
mixture the formulated diet and algae plus Artemia nauplii is used for culturing white shrimp
larvae.
*Corresponding author
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
20
v.
3
no.
2011
87
102
https://isfj.areeo.ac.ir/article_110010_277d4751f46312e7e3ca6ad439a5f7b3.pdf
dx.doi.org/10.22092/isfj.2017.110010
The biomass of the medicinal red algae (Rhodophyta) in the intertidal zone of the Chabahar coasts
B.M.
Gharanjik
author
M.
Wynne
author
Xia
Bangmei
author
S.
Khajeh
author
H.
Keyanmehr
author
M.R.
Hosseini
author
text
article
2011
per
Monthly sampling of red algae was carried out from April 2005 to March 2006 in
Chabahar coasts (southestern of Iran) along Sistan & Baluchistan province coastal waters. We
considered monthly periods of maximum tide according to tide tables. Then seaweed growth
area in intertidal zones was determind through GPS, GIS and satellite imagery. Monthly
sampling was conducted on a number of transects with equal distance and in randomly chosen
50Ã50cm quadrates. The samples were transfered to Offshore Waters Research Centerâs lab
and after cleaning and separating, the weight of each species recognized was measuerd
according to the present references. The biomass of each species was obtained per area unit
and in the total area after determing the average weight of species. During this research, 13
species of medicinal red algae were recognized, and the most important families included:
Gelidiaceae, Gracilariaceae, Hypneaceae and Rhodomelaceae. Total biomass in the area of
Chabahar Coasts were 865.2 tons and the monthly average was 72.1 tons. The maximum
biomass was obtained in February as 149.8 tons (828g/m2) and the minimum biomass was
seen in May as 16.3 tons (90.2g/m2). The maximum biomass belonged to Gracilaria corticata
(%33.1) and the minimum biomass to Hypnea pannosa (%1).
*Corresponding author
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
20
v.
3
no.
2011
103
114
https://isfj.areeo.ac.ir/article_110011_191db3793242bd4c24e648b62afdf08d.pdf
dx.doi.org/10.22092/isfj.2017.110011
Comparison of the digestive enzyme activities in Artemia urmiana from nauplii to adult stages using different diets
M.
Lashkarizadeh
author
M.
Farhangi
author
N.
Agh
author
O.
Safari
author
text
article
2011
per
Due to the importance of adult Artemia in aquaculture, information regarding the digestive
enzyme activities variation with inexpensive diets has great importance in Artemia at different
life stages. In this study, the effect of different inexpensive diets on digestive enzyme
activities, including trypsin, amylse and lipase of Artemia urmiana was investigated in
different life stages. The experiment was carried out with 5 treatments and each with 2
replicates over 15 days using 5 diets (wheat meal, common carp diet, soy meal, a mixture of
soy meal and canola meal (compound diet 1) and a mixture of soy meal and wheat meal
(compound diet 2) in a completely random design. Nauplii were introduced to their
cultivation environments after hatching and the digestive enzyme activities were measured in
days 5, 10 and 15 of the experiment. Positive and significant correlation were observed
between the crude protein content of the diets and trypsin activity (0.74), the carbohydrate
content of the diets and amylase activity (0.49), and crude fat content of the diets and lipase
activity (0.84). The activities of all enzymes were increased with the Artemia development in
this study. During the experimental period, the trypsin, activities were increased in all
treatments with the exception of wheat meal treatment, amylase activities were increased in
all treatments and lipase activities were increased in all treatments with the exception of
common carp diet and wheat meal treatments. Digestive enzyme activities were affected by
the diets and Artemia life stages. Regarding the increasing digestive enzyme activities until
adult stage in Artemia urmiana, using adult Artemia urmiana decreases pressure on resources
of Artemia cyst and nauplii in natural environments. In addition, this condition may result in
more economic returns and better quality of adult Artemia compared to its cyst and nauplii.
*Corresponding author
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
20
v.
3
no.
2011
115
128
https://isfj.areeo.ac.ir/article_110012_eb3c07427e9a8582a5878c15f9e6a999.pdf
dx.doi.org/10.22092/isfj.2017.110012
Macro-benthic population structure in Neor Lake, Ardebil province
R.
Mosavi Nadoshan
author
M.
Samanpazhoh
author
H.
Emadi
author
S.M.R.
Fatemi
author
text
article
2011
per
Macro-invertebrates play a key role in freshwater lentic and lotic ecosystems. Lake Neor is
located in northwest of Iran, southeast of Ardebil city, 2480m above the sea level.
Limnological data about lake is incomplete. This tectonic lake is known to have a unique
macro-invertebrate fauna. In order to describe the zoo-benthic community of the lake more
completely, the present study was conducted during a period of one year from August 2008 to
July 2009 with the exception of 3 months during the 5 months the lake is covered by ice. The
benthic assemblage was sampled monthly from four sites and these fauna were found to be
very limited with a total of 11 species belonging to 10 families, 10 orders, 7 classes and 3
phyla. Eight species were identified and recorded for the first time in the lake and in Iran.
Gammarus fasciatus, Pisidium supinum and Quistadrilus multisetosus were the dominant
benthic species representing more than 49, 43 and 5 percent of the total benthic fauna. Almost
all benthic species showed the same intra-annual, seasonal and spatial pattern. The highest
density was found in station 4, near the outlet, in July. The maximum abundance of total
population of macro-benthoses in Neor lake was composed of 41872.75 pieces in a sample
per square meter in September and the minimum with 28177.08 pieces in March. Dissolved
oxygen, temperature and habitat homogeneity seemed to be the main environmental factors
affecting community indices in Lake Neor.
*Corresponding author
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
20
v.
3
no.
2011
129
142
https://isfj.areeo.ac.ir/article_110013_77a542c3b2e3b048e2f90346a3f216d6.pdf
dx.doi.org/10.22092/isfj.2017.110013
Effects of lecithin on growth and hematological indices in juveniles of Siberian sturgeon (Acipenser baeri Brandet 1869)
E.
Najafipour Moghadam
author
B
Falahatkar .
author
M.R.
Kalbassi
author
text
article
2011
per
This study was carried out to evaluate the effects of dietary lecithin on growth performance
and hematological indices in juveniles of Siberian sturgeon (Acipenser baeri). Fish with initial
average weight of 32.9±0.3 grams were fed five isoproteic and isolipidic formulated diets
with different soybean lecithin levels including 0, 2.5, 5, 7.5 and 10% in triplicate groups for
8 weeks. Results showed that lecithin supplementation to 7.5% significantly increased some
growth indices such as body weight increase (BWI), specific growth rate (SGR), feed
conversion ratio (FCR ) final weight (Wf), condition factor (CF) and protein efficiency ratio
(PER). Also, increasing dietary lecithin to the level of 10% significantly decreased growth
indices. According to the results of hematological assays, hemoglobin (Hb) in treatments of
5% and 7.5% in comparison to other treatments had higher value. Hematocrit (Hct) in fish fed
with 7.5% lecithin was higher than those fed with 0 and 2.5% lecithin in the diets. Other
hematological indices such as WBC, RBC, MCV, MCH and MCHC showed no significant
differences among the treatments. In conclusion, the results of this study indicated that
Siberian sturgeon juveniles have a relatively moderate lecithin requirement (between 5 and
7.5 percent of the diet) and these levels of lecithin in diet induces increase of growth
performance and improves health status of this species.
*Corresponding author
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
20
v.
3
no.
2011
143
154
https://isfj.areeo.ac.ir/article_110014_786783b994e9d7d0ec101c0db782fc65.pdf
dx.doi.org/10.22092/isfj.2017.110014
Population dynamics of Barbus grypus (Heckel, 1843) and Barbus barbulus (Heckel, 1847) in Karoon River, south-west Iran
S.A.R.
Hashemi
author
S.A.
Mortazavi
author
text
article
2011
per
Barbus sp. fish samples were collected during November 2007 to October 2008 from five
landing stations in Karoon River: Gotvand, Shoshtar, Molasani, Ahwaz, and Darkhoin.
During one year of study, more than 2000 specimens of B. grypus and B. barbulus were
measured, mean±SD length values for this species were 37.94±8.18 and 43.62±10.27,
respectively and maximum and minimum total length were 20-76cm and 20-94cm,
respectively. Mean±SD of weight values for this species were 873.2±1092.45 grams and
778.59±725.97 grams, respectively and maximum and minimum weight were 52-11170
grams and 52-4675 grams, respectively. Growth and mortality parameters were calculated for
B. grypus and B. barbulus as Lâ: 86.64, 132.9 and K: 0.27, 0.17 and t0: -0.46, -0.66, M: 0.50,
0.33, F: 1.22, 1.04, Z: 1.72, 2.72, 'Ф: 3.31, 3.48, E: 0.71, 0.76, respectively. According to the
exploitation coefficient, B. grypus and B. barbulus stocks are overfished hence we suggest a
decrease in exploitation coefficient. Based on results and their comparison with the American
Fisheries Society (AFS) indices, these species are classified in moderate to high vulnerable
group fishes.
*Corresponding author
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
20
v.
3
no.
2011
155
166
https://isfj.areeo.ac.ir/article_110015_b2e31bdcd62e860f25b209250f08a32c.pdf
dx.doi.org/10.22092/isfj.2017.110015
Comparison of muscular tissue composition of rainbow trout in brackish and different salinity waters
H.
Hosseinzadeh
author
Sh.
Masaeli
author
H.
Negarestan
author
M.
Alizadeh
author
text
article
2011
per
In this research, controlled changes of rainbow trout muscular composition cultured in
brackish water (14.1ppt) and freshwater (4.3ppt) was compared. Some 180 juvenile rainbow
trout with a weight of 47.2±0.1g each were released in 6 polyethylene tanks with a capacity of
1.5m³. During the experiment, water temperature was kept constant. Feeding fish was
conducted using common Faradaneh food and considering water temperature and fish biomass.
After 126 days, fishes attained around 320±20g of weight, were sampled and taken to
laboratory and the amount of protein, fat, ash, minerals and moisture in their muscle tissue were
measured. Results showed amount of fat and dry matter in brackish water cultured fishes is less
than those cultured in freshwater. The average percentage of protein and minerals in brackish
freshwater cultured fishes were significantly different and the average percentage of moisture in
brackish water cultured fish was higher than those of the freshwater fish.
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
20
v.
3
no.
2011
167
172
https://isfj.areeo.ac.ir/article_110016_9083344a92c2e261087ac75597dc253b.pdf
dx.doi.org/10.22092/isfj.2017.110016
Morphological changes of Bunni (Barbus sharpeyi) larvae in laboratory conditions
M.
Khodadadi
author
S.
Ahmadi
author
A.
Dezfoulian
author
text
article
2011
per
In this study, the early development of Bunni (Barbus sharpeyi) larvae was surveyed
through morphological changes and measuring total length, standard length, head length,
thickness of larvae, eye diameter and snout length. The initial period of the larval life can be
divided into 2 phases: endogenous and exogenous food sources. During the first three days of
the larvae development, there was a gradual yolk sac reduction until its complete absorption at
the end of third day, indicating the necessity of exogenous feeding. From the fourth to
eleventh day, the final development of the heart, gill, air bladder, fins and intestine were
observed. Total length of newly hatched larvae was 6.26mm and total length of fifteen days
larvae was 8.35mm. The larval development of Barbus sharpeyi was similar to other Barbus
species.
*Corresponding author
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
20
v.
3
no.
2011
173
178
https://isfj.areeo.ac.ir/article_110017_44c2075ec75d20c84d51c5054d8be7d2.pdf
dx.doi.org/10.22092/isfj.2017.110017