Iraqi Journal of Aquaculture

The growth of Barbus xanthopterus (Heckel) juveniles was studied
with men primary length and weight 7.96±0.076 cm 37.14±0.032 gm
respectively in aquariums under laboratory conditions using artificial
diet for a period sixty days , the biological parameters, length, weight ,
weight increase , relative growth rate, specific growth rate and some
environmental parameters were also measured. The environmental
parameters was within the ideality limit of Barbus xanthopterus , the
results showed the existence of differences in growth rates between
fishes in aquariums experience the highest rate for increasing weight
recorded for fish in the aquarium B, amounting to 118.4 g, followed by
the fishes in the aquarium A and B, amounting to 114.6 and 111.2 g
respectively.
The study showed that the current fish Barbus
xanthopterus is a local fish that can be cultivated because they give
great growth encouraging compete with local species other if cultured in
appropriate environments and densities because the growth is directly
proportional to the temperature, the total values for increasing weight
(every 15 days) during the experiment was 0.832and 1.383 and 1.350
and 1.606 g / day.

This study reviewed the validity of using the scales of Hilsa Shad
(Tenualosa ilisha) and other migratory species as a tool to
estimate age, growth, maturity schedule and migration. Hilsa
Shad scales were used long ago, and proved in several studies.
most of these studies showed that scales could give valuable
information, which could be used as benchmarks in the study of
fisheries and plans for future successful management policies. Bt
it needs Patience and precision for the extraction of these
information, because of difficulties in reading these scales. The
work need to study the sufficient number of scales and practice,
to be easily. As a result, this study will open doors that were
closed for decades to set new migration study tools for Hilsa Shad
in Iraq.

In the study we cultured the shrimp L. vannamei (initial weight
0.0004 g) under laboratory conditions in marine science center and using
three types of food. These were life food (Artemia nauplii), artificial died
and mixed food (Artemia nauplii and artificial died). The highest average
weight were achieved when feeding on the mixed feed (1.210 g), while,
lower values achieved when fed on artificial diets 0.220 g. There are
significant differences (P<0.05) between these three food types. A similar
results were obtained for growth in terms of length, the highest average
length of larvae after six weeks was achieved when fed on the mixed food
(36.58 mm ), comparing with these larvae fed on Artemia and artificial
feed were 31.11 and 18.72 mm respectively, and there are difference
significantly too (P < 0.05) between the three food types. The highest
average weight increment was recorded during the sixth week with mixed
food it was 0.55 g, compared with 0.23g and 0.12 g for Artemia and
artificial diets respectively. The higher survival rates after sixth week were
calculated for the three treatments, the high survival in larvae fed on
Artemia it was 90.58 %, while, these fed on mixed food and artificial diet
it was 85.62% and 73.24 % respectively.

This study was carried out in the Marine Sciences Laboratory
of Agriculture Faculty at Tishreen University, in collaboration with
the Higher Commission for Scientific Research, on the Small
Spotted Catshark Scyliorhinus canicula (Linnaeus, 1758) in the
Syrian marine water (Eastern Levant of Mediterranean sea); From
Rass Albassit northward ( 35° 55  N), to the Lebanese borders
southward (
°
34
50
´
N). During the period January 2012 to
September 2013. 417 specimens (231 females, 186males) were
collected at depths 50-250 m, from sandy or sandy-muddy bottoms
by different fishing gears; mainly hook sub bottom. S. canicula
suffers an overfishing into the Syrian marine water. The highest
fishing quantity was during spring and summer. The total length of
specimens ranged from 225 to 515 mm TL, and weighed from 22
380 g. Smallest specimens matured of males and females were 355,
350 mm, respectively. The total length ranged from 355 -500 mm
TL for adult males, and 350 -515 mm TL for adult females. S.
canicula is an oviparous species. The largest yolky oocytes diameter
was 12 mm, and weighed 1.3 g. The ripe oocytes is covered and
ovulated as an egg capsule. The length of egg capsules ranged from
42 -50 mm, their width from 16-18 mm, and their mass reached to
4.8 g.

In the present study the fish Coptodon zillii are
collectedfrom Sarragy River in Abu Alkhasiib region through two
season that the first is expansion from 7\2013 to 11\2013 and the
second season is expansion from 12\2013 to 6\2014,and bringing it to
the laboratory for dissection and ablation the gills for studied the
histopathological change that appear on it, that included change of
the form of some secondary lamellae, adherence in other secondary
lamella ,cellular hyperplasia , hypertrophy , swelling in the epithelial
layer of secondary lamellae, epithelial lifting ,and hyperplasia in
cartilage skeletal of primary filaments.

The experiment was conducted using 48 fish, common carp
Cyprinus carpio (average weight 41.51 + 3.51 gm), The fish
were distributed on 6 aquaria each one contain 8 individuals,
after two weeks acclimatization on commercial diet (35%
protein) to reduce individual differences in nutritional status,
fish were exposed to starvation, fish weighed and body
composition (moisture, protein, lipid and ash) was analyzed
using 5 specimens every two weeks. Fish weight decreased
noticeably as a result of consumption of some components of
the body to sustain essential activities, fish showed significant
decrease (P < 0.01) in carcass dry matter, protein and lipid,
while moisture increased significantly (P < 0.01), fish used
91.8% of carcass lipid and 20.1% of carcass protein during the
experiment period, no significant (P > 0.05) effect of star