Iranian Fisheries Research Organization
Iranian Journal of Fisheries Sciences
1562-2916
11
4
2012
10
1
First feeding strategy for hatchery produced Beluga sturgeon, Huso huso larvae
713
723
EN
N.
Agh
agh@urmia.ac.ir
Y
F.
Noori
N
N. M.
Makhdom
N
Co-feeding
of fish larvae with live food and formulated diet has been at the focus of fish
nutritionists since last decade. In this study we tried to refine the feeding
practices of great beluga sturgeon (Huso huso) larvae using different
combinations of newly hatched Artemia urmiana nauplii and trout starter
diet. Three replicate groups (250
fish/replicate) of first-feeding Huso huso
larvae were fed on the basis of four main
feeding regimens: (1) live food (live nauplii of brine shrimp Artemia urmiana)
(2) indirect transition (5 days live food followed by gradual transition to
formulated diet) (3) direct transition (using different combinations of live
and formulated diet from start feeding) (4) formulated feed (FD). It
was found that combining live food and manufactured diets (co-feeding) from
first feeding stage (direct transition) significantly improves the weight gain
in H. huso larvae followed by indirect transition, live food and FD. But
survival was significantly higher in larvae fed on pure live food and direct
transition regimens compared to indirect transition and FD. It was concluded that co-feeding of H.
huso could be started immediately from commencement of exogenous feeding.
Huso huso, Artemia nauplii, Formulated diet, Co-feeding, Growth, Survival
http://jifro.ir/article-1-732-en.html
http://jifro.ir/article-1-732-en.pdf
Iranian Fisheries Research Organization
Iranian Journal of Fisheries Sciences
1562-2916
11
4
2012
10
1
Seasonal Variations of Fat and Fatty Acid Composition in Muscle Tissues of Mediterranean Octopuses
724
731
EN
Deniz
Ayas
ayasdeniz@gmail.com
Y
The effects of seasons on lipid and fatty acid profiles of muscle types
(mantle and arm) of Mediterranean octopuses (common octopus-Octopus vulgaris
and musky octopus-Eledone moschata) were investigated. The
results showed that lipid levels ranged from 0.75% to 1.60% in both muscle
types of octopuses which were considered as lean. Lipid levels in mantle
tissues of both octopus species were higher than lipid levels in their arms.
Although these two octopus species contain small amounts of lipid, they are
good sources of n-3 PUFAs content
(especially EPA and DHA) for all season regardless of muscle types. The highest
levels of EPA were obtained from mantle and arms tissues (18.23%) of common
octopus in spring. The highest levels of EPA were obtained from mantle (12.90%)
and arms (12.67%) of musky octopus in autumn and winter. The levels of EPA in both
of muscle tissues of common octopus were found to be higher than levels of EPA
in both of muscle tissues of musky octopus. The highest DHA levels were
obtained from mantle tissue (28.17%) of common octopus in summer. There were
significant differences (p<0.05) in the levels of SFA, MUFA and PUFA in
terms of species, season, and muscle types.
Common octopus, Musky octopus, Season, Fatty acids, Lipid
http://jifro.ir/article-1-733-en.html
http://jifro.ir/article-1-733-en.pdf
Iranian Fisheries Research Organization
Iranian Journal of Fisheries Sciences
1562-2916
11
4
2012
10
1
State of Mnemiopsis leidyi (Ctenophora: Lobata) and mesozooplankton in Iranian waters of the Caspian Sea during 2008 in comparison with previous surveys
732
754
EN
S.
Bagheri
siamakbp@gmail.com
Y
U.
Niermann
N
J.
Sabkara
N
A.
Mirzajani
N
H.
Babaei
N
Mnemiopsis leidyi which was accidentally
introduced into the Caspian Sea in 1999 and
since then has colonized extensively. The horizontal distribution of M. leidyi and dominant mesozooplankton
species was investigated in the south western Caspian Sea during February, May,
July and November 2008. The average number and biomass of M. leidyi were in the same range (ca 200 individuals.m-3
(2000 ind.m-2) and 16 g wet weight.m-3
(180 g.m-2) in comparison with previous surveys. As in previous
years the population consisted mainly of individuals <1 cm. The decline in
mesozooplankton species observed since 1996 continued in 2008. Only two species
of the previously recorded 24 Cladocera
species were found in 2008. Of five Copepoda species recorded in 1996, only one,
Acartia tonsa, was found in 2008 and
even here adult individuals have reduced 3-fold since 1996. Bivalve larvae have declined by one
order of magnitude since 1996. Among the dominant species, only the numbers of
Cirripedia larvae and in part the numbers of Pleopis polyphemoides
(Cladocera) were in the same range as in 1996.
Mnemiopsis leidyi, Acartia tonsa, Mesozooplankton, Long-term fluctuation, Caspian Sea
http://jifro.ir/article-1-734-en.html
http://jifro.ir/article-1-734-en.pdf
Iranian Fisheries Research Organization
Iranian Journal of Fisheries Sciences
1562-2916
11
4
2012
10
1
Sperm quality, egg size, fecundity and their relationships with fertilization rate of grass carp (Ctenopharyngodon idella)
755
764
EN
Y.
Bozkurt
yfbozkurt@yahoo.com
Y
F.
Öğretmen
N
Gametes
were collected by abdominal massage from 15 anesthesized male and female grass
carp. In collected sperm samples the following mean spermatological properties
were determined: sperm volume 15.64 ± 5.39 mL, sperm motility 81.20 ± 7.61%, motility
duration 62.06 ± 19.40s, density 17.88±5.48 x109 mL-1,
total density 428.90±302.05 x109, and pH 7.25±0.81. Also egg size
(mm) and fecundity (egg/fish) were determined as 1.04±0.028
and 417867 ± 36.274 respectively in female grass carp. The fertilization
capacity of sperm was tested with the same egg pool. The insemination dosage
was 2x105 spz/egg for each fertilization experiment. Fertilization
rate was determined as mean 79.3±2.95% and positively correlated with sperm
motility (r=0.932, p<0.01), egg size (r=0.513,
p>0.05) and fecundity (r=0.539, p>0.05).
Grass carp, Sperm, Motility, Fertilization
http://jifro.ir/article-1-735-en.html
http://jifro.ir/article-1-735-en.pdf
Iranian Fisheries Research Organization
Iranian Journal of Fisheries Sciences
1562-2916
11
4
2012
10
1
In vitro effects of Sargassum latifolium (Agardeh, 1948) against selected bacterial pathogens of shrimp
765
775
EN
A.
Dashtiannasab
adashtiannasab@gmail.com
Y
S.
Kakoolaki
N
M.
Sharif Rohani
N
V.
Yeganeh
N
During the last
decade, shrimp aquaculture has developed rapidly in many developing countries. Antibiotic
resistance is a major problem in shrimp aquaculture. Seaweeds are considered as
potent source of bioactive compounds that are able to produce biological
activities. The aim of this study was to evaluate the antibacterial activity of
ethanolic and chloroformic crude extracts of the brown algae, Sargassum latifolium
derived from Persian Gulf waters. The extractions against shrimp selective
pathogen bacteria including Vibrio alginolyticus, V. parahaemolyticus and
V. harveyi were used by disk diffusion agar method. Results
revealed that all mentioned bacteria were sensitive to both ethanolic and chloroformic
crude extracts of S.latifolium. The minimum inhibitory concentration of
chloroformic extract of S. latifolium against the bacteria was performed
by tube dilution technique. MICs were 5, 10 and 10 mg ml-1 for V.
alginolyticus, V. parahaemolyticus and V. harveyi, respectively while
minimum bactericidal concentrations (MBC) were 5, 15 and 20 mg ml-1.
This study recommended that S.latifolium isolated from Persian Gulf
waters has antibacterial activity potential against shrimp pathogen bacteria.
Antibacterial activity, Sargassum latifolium, Seaweed extract, Vibrio, Persian Gulf
http://jifro.ir/article-1-737-en.html
http://jifro.ir/article-1-737-en.pdf
Iranian Fisheries Research Organization
Iranian Journal of Fisheries Sciences
1562-2916
11
4
2012
10
1
Immunohistochemical study of the endocrine cells in the stomach and pyloric caeca of the mountain trout, Salmo trutta macrostigma
776
785
EN
B.
Gençer Tarakçi
btarakci@firat.edu.tr
Y
A.
Bayrakdar
N
M.
Yaman
N
The endocrine cells of Salmo trutta macrostigma stomach and
pyloric caeca have been investigated using immunohistochemical techniques. 8
antisera were tested and 6 of them were detected in the endocrine cells serotonin,
somatostatin, substance P, galanin, CCK and neuropeptide Y. These
immunoreactive cells are described for the first time in the stomach and
pyloric caeaca of Salmo trutta
macrostigma. Neurotensin and VIP immunoreactivity were not detected in
these regions. The regional distribution and relative frequency of the endocrine
cells in the stomach and pyloric caeca of Salmo
trutta macrostigma were resembled (with respect to serotonin, somatostatin,
CCK and substance P immunoreactivity) and showed also some particularities
(presence of galanin and NPY positive cells) to those of the other salmonid
species.
Endocrine cell, Stomach, Pyloric caeca, Salmo trutta macrostigma, Immunohistochemistry
http://jifro.ir/article-1-736-en.html
http://jifro.ir/article-1-736-en.pdf
Iranian Fisheries Research Organization
Iranian Journal of Fisheries Sciences
1562-2916
11
4
2012
10
1
Population structure of Killifish, Aphanius anatoliae (Cyprinodontidae) endemic to Anatolia in Lake Eğirdir-Isparta (Turkey)
786
795
EN
Salim Serkan
Guclu
salimguclu@sdu.edu.tr
Y
The
population structure of Aphanius
anatoliae in Lake Eğirdir-Isparta-Turkey was studied, using 522 fish monthly in 2008. This
study were observed in the number of individuals of each sex, age, weight and size
compositions. In addition, the total length-weight relationship was calculated
as well as the Von Bertalanffy growth equation. A study of the food uptake
throughout the year has been carried by examination of the content of the digestive
track. Males made up 51.92%, and females 48.08% of the population. The length-weight
relationship and Von Bertalanffy growth equation were estimated as W= 0.0232 e 0.098L,
r=0.8262, Lt = 54.51 (1 – e –0.279 ( t+1.345)),
respectively. Bacillariophyta, Gammarus
pulex and aquatic insecta are the major food items for Aphanius anatoliae.
Anatolia, Killifish, Endemic, Growth, Feeding
http://jifro.ir/article-1-738-en.html
http://jifro.ir/article-1-738-en.pdf
Iranian Fisheries Research Organization
Iranian Journal of Fisheries Sciences
1562-2916
11
4
2012
10
1
Fishery and biological aspects of anchovy Kilka ( Clupeonella engrauliformis) in the southern Caspian Sea
796
806
EN
A. A.
Janbaz
aliasgharjanbaz@yahoo.com
Y
H.
Fazli
N
R.
Pourgholam
N
F.
Kaymaram
N
M. A.
Afraei Bandpei
N
S.
Abdolmaleki
N
K.
Khedmati
N
This paper aimed to investigate
the fishery and biological characteristics of anchovy Kilka in Iranian waters
of the Caspian Sea from 2005-2007, including length and age structure ,Von Bertalanffy growth parameters, length and age at
first capture, condition factor, sex ratio,
natural and fishing mortality. The examination of
catch data approved that Kilka population in the Caspian Sea have been declined
a few years ago following entrance jellyfish Ctenophora Mnemiopsis leidyi.
The greatest destruction of anchovy kilka catch was occurred while the catch of
anchovy from 4250 tonnes in 2005 reached to 924 tonnes in 2007.
The results showed that K value and L∞ calculated 0.375/year,
131.7mm, respectively. The instantaneous coefficient of natural mortality was
estimated 0.49/year.The instantaneous coefficient of fishing mortality and total mortality was 0.51 /year and 1/year, respectively. The
Exploitation rate was calculated as 0.51. The length and age ranges restricted comparison
to last decade and sharply decreased recruitment. In
the past few years, the main reasons of
disintegrates among anchovy Kilka stocks in the Caspian
Sea were synchronized
overfishing competitive anchovy Kilka with M. leidyi.
Caspian Sea, Clupeonella engrauliformis, Age, Growth, Sex ratio, Overfishing
http://jifro.ir/article-1-739-en.html
http://jifro.ir/article-1-739-en.pdf
Iranian Fisheries Research Organization
Iranian Journal of Fisheries Sciences
1562-2916
11
4
2012
10
1
Phytoplankton growth and microzooplankton grazing in the Homa Lagoon (İzmir Bay, Turkey)
807
824
EN
K.
Banu
kutlubanu@gmail.com
Y
Phytoplankton
growth and microzooplankton grazing were investigated at one station in the
Homa Lagoon from February to January in 2006-2007. Our results showed
significant seasonal variations in phytoplankton dynamics. Microzooplankton was
mainly composed of dinoflagellates and tintinnid ciliates and nauplii.
Microzooplankton grazing increased with increasing of temperature. Grazing rate
was maximum levels in spring and summer. Microphytoplankton, which dominated
the total algal biomass and production, were characterized by the proliferation
of several chain-forming diatoms. Small heterotrophic flagellates and aloricate
ciliates were the main controllers of phytoplankton.
Phytoplankton represented a significant for micrograzers, which grazing
represented 20–120% of diatom and cynabacteria algal production during
2006-2007. Microzooplankton has, however, a relatively high impact on
microphytoplankton, as > 45% of microalgal production was consumed
throughout the year. These results suggest that the low grazing was one of the
factors contributing to the development of the spring bloom. All of seasonal bases, the phytoplankton production were grazed by
microzooplankton in summer, autumn and winter–spring seasons have been changing
between 20%-120%. The seasonal variation in the
microzooplankton grazing pressure seems to result from the dominant size class of
the phytoplankton community of this lagoon diatom and cynabacteria.
Grazing, Lagoons, Microzooplankton, Nutrient, Phytoplankton
http://jifro.ir/article-1-740-en.html
http://jifro.ir/article-1-740-en.pdf
Iranian Fisheries Research Organization
Iranian Journal of Fisheries Sciences
1562-2916
11
4
2012
10
1
Concentration of heavy and toxic metals Cu, Zn, Cd, Pb and Hg in liver and muscles of Rutilus frisii kutum during spawning season with respect to growth parameters
825
839
EN
F.
Monsefrad
javidiman@gmail.com
Y
J.
Imanpour Namin
N
S.
Heidary
N
Concentration of heavy and
toxic metals Cu, Zn, Cd, Pb and Hg were determined in liver and muscles of Rutilus
frisii kutum and their relationships with growth parameters (length, age,
condition factor) and hepatosomatic index were examined. Thirty-six fish
samples were collected from February through March 2009 caught by beach seine in
the southwest parts of the Caspian Sea. Atomic absorption and Hg determined
concentrations of Cd, Pb, Zn and Cu by vapor method. Cadmium was recorded only
in liver samples. Range of other metals in muscle tissue were ND -0.591, 0.001-0.013,
11- 26 and 0.729 -7.261 µg.g-1dw for Pb, Hg, Zn and Cu respectively.
Highest levels of Pb, Zn, and Cu were recorded in muscles Hg and Cd in liver
samples. Growth parameters showed a significant relationship with Zn and Cd concentrations
in liver samples and only Zn concentrations in muscle samples. There was a
positive significant correlation between concentration of Cd in liver and
physiological indices (p<0.05). Although higher
concentration of Pb was recorded in this study in comparison to previous
studies, based on Provisional Tolerable Weekly and daily Intake of fish for
human health, kutum is considered safe for human consumption. Considering the
results of this study it seems reproductive status of the fish influences heavy
metals concentration in liver and muscles of kutum and therefore concentrations
of some metals such as Zn and Cu in liver samples may not be a reliable bioindicator
for environmental pollution.
Rutilus frisii kutum, Caspian Sea, Reproduction, Growth, Condition factor, HSI
http://jifro.ir/article-1-741-en.html
http://jifro.ir/article-1-741-en.pdf
Iranian Fisheries Research Organization
Iranian Journal of Fisheries Sciences
1562-2916
11
4
2012
10
1
Seasonal change of thyroid histomorphological structure and hormone production in yellowfin seabream (Acanthopagrus latus) in the Persian Gulf
840
848
EN
N.
Salamat
salamatnegin@yahoo.com
Y
M.
Havasi
N
N.
Earfani Majd
N
A.
Savari
N
Seasonal changes of the thyroid gland structure
and hormones secretion was examined in yellowfin seabream (Acanthopagrus
latus) in the northwest of Persian Gulf (Musa creek). Thyroid gland composed
of follicles scattered around the ventral aorta, near the gills. Follicular
cells varied according to secretion of the gland during warm and cold seasons. Thyroid hormones (Triidothyronine [T3]
and Thyroxine [T4]) were detected in the fish
serum in levels ranged from 4.09-1.30 ng/mL for T3 and from 1.10-0.21 ng/mL for
(T4) in the warm and cold seasons, respectively. The results showed that the
height of thyroid epithelium and plasma concentration of thyroid hormones (thyroid
activity) in A. latus increased significantly during spring and summer.
The peak of these factors occurred in midsummer (August). Then, the thyroid
activity decreased significantly during autumn and early winter from
October to December according to decrease of temperature. T3 and T4 increased
significantly from January to April.
Yellowfin seabream, Acanthopagrus latus, Thyroid gland, Triidothyronine, Thyroxine, Histology, Plasma
http://jifro.ir/article-1-742-en.html
http://jifro.ir/article-1-742-en.pdf
Iranian Fisheries Research Organization
Iranian Journal of Fisheries Sciences
1562-2916
11
4
2012
10
1
A putative probiotic isolated from hatchery reared juvenile Penaeus monodon
849
866
EN
S.
Shakibazadeh
N
S.
Che Roos
cheroos@agri.upm.edu.my
Y
M.
Hafezieh
N
A.
Christianus
N
M.
Saleh Kamarudin
N
Sijam Kamaruzaman
N
Probiotic is
considered as a remedy to solve disease problem in shrimp aquaculture. Shrimp
body and environment bacterial flora are recommended as reliable source for
extracting of beneficial bacteria. Therefore, 5000 pieces of post larvae of Penaeus
monodon were distributed equally in 4 tanks in probiotic and antibiotic
free condition up to juvenile. Then microbiological samples from digestive system,
muscles, body surface, rearing water and tank sediment were inoculated onto the
selective media plates. Incident of total bacteria, Vibrio, Pseudomonas
and Entrobacteriaceae were evaluated in different body parts and rearing
environment of shrimp. The highest bacteria count for total bacteria, Vibrio,
Pseudomonas was occurred in sediment followed by digestive system. No Entrobacteriaceae
was observed from all samples. Isolated bacteria were identified and placed in
7 genera consisted of Vibrio, Shewanella, Burkholderia,
Clavibacter, Staphylococcus, Brevibacterium,
Corynebacterium, while one genus remained unidentified. Genus Shewanella
exhibited highest frequent bacteria in digestive system of P. monodon which
may be indicated its ability to colonization in digestive system. Shewanella
algae was selected from whole isolated bacteria as candidate probiotic via
well plate diffusion technique and cross streak antagonistic test against Vibrio
harveyi, V. parahaemolyticus and V. alginolyticus. It was
able to digest lipid and protein in tributyrin agar and skim milk agar.
Probiotic, Shewanella algae, Penaeus monodon, Shrimp
http://jifro.ir/article-1-743-en.html
http://jifro.ir/article-1-743-en.pdf
Iranian Fisheries Research Organization
Iranian Journal of Fisheries Sciences
1562-2916
11
4
2012
10
1
Pb and Cd accumulation in Avicennia marina from Qeshm Island,
867
875
EN
E.
Shirvani Mahdavi
eshirvani@gmail.com
Y
A. E.
Khajeh Rahimi
N
H.
Vakili Amini
N
The
accumulation of heavy metals Pb and Cd in the mangrove, Avicennia marina,
was studied on the southern coast of Iran, particularly on and near Qeshm
Island in the Persian Gulf. The samples were collected from 7 stations
which they were analyzed by flame Atomic absorption spectrophotometer after
chemical digestion. Maximum Pb and Cd in leaves are (34.50, 3.52 ppm) and
minimum of them are in stems (2.00, 0.05 ppm) and the accumulation of
metals in leaves is more than stems. The different between monitored stations and accumulation of metals in tissues (P≥0.01) was not significant and there was no significant relationship
between the leaves and stems of metals concentration (P≥0.05) but it was
significant relationship between concentration of Pb and Cd in leaf tissue and
stem tissue alone. (P<0.05). After entering these metals to food chain, are
accumulated in human body and this matter may cause some disease by receiving
metals more than provisional tolerable
weekly intake (PTWI) of lead and cadmium, in adults which in 0.025
and 0.007 mg/kg body weight with
standards ENHIS.
Heavy metal, Avicennia marina, Persian Gulf
http://jifro.ir/article-1-744-en.html
http://jifro.ir/article-1-744-en.pdf
Iranian Fisheries Research Organization
Iranian Journal of Fisheries Sciences
1562-2916
11
4
2012
10
1
Cyanobacterial community patterns as water quality Bioindicators
876
891
EN
N.
Soltani
N
K.
Khodaei
khodaeekamal@yahoo.com
Y
N.
Alnajar
N
A
Shahsavari
N
A.
Ashja Ardalan
N
The main goal of this
study was to examine the use of cyanobacteria for evaluating the
quality of running water. Accordingly epilithic cyanobacterial communities were
collected in Dez River and Ojeyreb drain in south of Iran. Samples were
collected in two seasons: autumn and spring. Effective physical and chemical
factors on the structure of cyanobacterial communities and the dispersion of
the species in relation with them were determined using PCA and CCA analyses. The
Shannon-wiener biodiversity index was used to define the species diversity. The
concentration of Nitrate as main nutrient had significant increase in Drain
stations. A decline in species richness was observed associated with these
increases in nutrient load in both seasons in different cyanobacterial
community structure. The results
indicated that order Oscillatoriales had higher proportion of cyanobacteria
species at Drain. The species Oscillatoria
chlorina, Chroococcus minor, Phormidium
tenue and Lyngbya kuetzingii S
had the most positive correlation with nutrient factor. Species Lyngbya infixa and Lyngbya mesotrichia had the most negative correlation with nitrate. Our
results confirm the using of cyanobacteria species as indicators for monitoring
eutrophication in rivers and define them as water eutrophication bioindicators.
Cyanobacteria, Drainage, Eutrophication, River, Water quality, PCA
http://jifro.ir/article-1-745-en.html
http://jifro.ir/article-1-745-en.pdf
Iranian Fisheries Research Organization
Iranian Journal of Fisheries Sciences
1562-2916
11
4
2012
10
1
Feeding habits and stomach contents of Silver Sillago,
892
901
EN
A.
Taghavi Motlagh
N
M.
Hakimelahi
hakimelahi@inio.ac.ir
Y
M.
Ghodrati Shojaei
N
A.
Vahabnezhad
N
A.
Taheri Mirghaed
N
The
study investigated the stomach content of Sillago sihama in
Hormuzgan Province waters located in the northern Persian Gulf from October
2009 to March 2010. The stomach analysis was carried
out using frequency of occurrence and numeric methods. Diatoms, blue- green
algae and dinoflagellates constituted main food of plant origin. Diatoms were
found to be the most preferable food of plant origin where it occurred in more
than 60.8% of food item by number and 59.5% by occurrence. Crustacean
including crabs and their larvae, shrimps, copepods, eggs and larval forms
comprised the maximum part of the food of animal origin. It was concluded that Sillago
sihama in the Coastal waters of Hormuzgan Province is planktonivorous and feeding
on a wide range of food of planktonic and benthic organisms.
Sillago sihama, Feeding, Stomach contents, FP, Persian Gulf
http://jifro.ir/article-1-746-en.html
http://jifro.ir/article-1-746-en.pdf
Iranian Fisheries Research Organization
Iranian Journal of Fisheries Sciences
1562-2916
11
4
2012
10
1
Effect of different levels of dietary Betaine on growth performance, food efficiency and survival rate of pike perch (Sander lucioperca) fingerlings
902
910
EN
E.
Zakipour Rahimabadi
e_zakipour@yahoo.com
Y
M.
Akbari
N
A.
Arshadi
N
E
Effatpanah
N
A
6-week feeding experiments were carried out to determine the effects of different
levels of dietary betaine on growth performance, food efficiency and survival
rate of pike perch which has a critical period during transition feeding. Fingerlings
of pike perch were fed with live food (treatment A), without betaine added to
biomar (treatment B), 1% betaine added to biomar (treatment C) and 2% betaine
added to biomar (treatment D) in 1000 l concreted tanks. 200 fingerlings (1.50
g, mean weight) were stocked in each tank and fed up to 7 meals per day. Higher
increment in body weight (4.99 ± 0.73 g), specific growth
rate (3.90 ± 0.06) and food efficiency (104.42 ± 4.27) were obtained with
treatment D (2% betaine added to biomar). This treatment also showed
significant (P<0.05) decrease in food conversion ratio (0.93 ± 0.04) in comparison with
other treatments. Highest survival rate was observed in treatment B (biomar
without betaine) with a 34.5 % rate and greatest cannibalism (1.03 ± 0.01) was found in
treatment D, respectively. It was concluded that betaine could increase the
palatability and acceptability of food and could be suitable to weaning the
pike perch fingerlings to artificial diet.
Sander lucioperca, Betaine, Food attractants, Growth, Food efficiency
http://jifro.ir/article-1-747-en.html
http://jifro.ir/article-1-747-en.pdf
Iranian Fisheries Research Organization
Iranian Journal of Fisheries Sciences
1562-2916
11
4
2012
10
1
Chitinase Isolated from Water and Soil Bacteria in Shrimp farming Ponds
911
925
EN
M.
Zarei
N
S.
Aminzadeh
aminzade@nigeb.ac.ir
Y
A.
Ghoroghi
N
A. A.
Motalebi
N
J.
Alikhajeh
N
M.
Daliri
N
Chitinases have received
attention because of their wide applications in the medicine, biotechnology,
agriculture, waste management and industrial applications such as food quality
enhancer and biopesticide. Excessive use of insecticides has led to several
problems related to pollution and environmental degradation. In this study, isolation and identification of native bacterial
strains with chitin hydrolysis activity, took place from water and soil of shrimp
culture ponds in Bushehr and Abadan.
To investigate the capacity of our chitinase for using in insecticide,
biochemical properties of selected chitinase obtained in this research were
compared to that of produced by Bacillus cereus p-1, isolated
from an insecticide tablet. In this
research, three mesophilic strains containing: Serratia marcescens B4A, Citrobacter
freundii B1A and Bacillus cereus B3R were isolated. Results showed a 1600 bp band corresponding to
chitinase gene. The similarity between temperature and pH profile and stability of
chitinase was extracted from native bacteria and ones was obtained from Bacillus
cereus p-1 implied that chitinase extracted from Serratia
marcescens B4A has potential application in industry.
Chitinase, Chitin, Shrimp pond, Bacteria
http://jifro.ir/article-1-748-en.html
http://jifro.ir/article-1-748-en.pdf
Iranian Fisheries Research Organization
Iranian Journal of Fisheries Sciences
1562-2916
11
4
2012
10
1
Short Communication: DNA Extraction Using Liquid Nitrogen in Staphylococcus aureus
926
929
EN
H.
Ahari
Dr_hamed_ahari@hotmail.com
Y
V.
Razavilar
N
A. A.
Motalebi
N
B.
Akbari-adergani
N
s.
Kakoolaki
N
A. A.
Anvar
N
D.
Shahbazadeh
N
N.
Mooraki
N
Staphylococcus aureus, DNA extraction, Liquid nitrogen
http://jifro.ir/article-1-749-en.html
http://jifro.ir/article-1-749-en.pdf
Iranian Fisheries Research Organization
Iranian Journal of Fisheries Sciences
1562-2916
11
4
2012
10
1
Short Communication: Effects of Hypoxic Stress on Electrolyte Levels of Blood in Juvenile Rainbow Trout (Oncorhynchus mykiss)
930
937
EN
G. T.
Keleştemur
gkelestemur@firat.edu.tr
Y
Rainbow trout, Flow rate, Hypoxic stress, Blood electrolyte
http://jifro.ir/article-1-750-en.html
http://jifro.ir/article-1-750-en.pdf