ISSN: 1812-237X

Volume 11, Issue 2

Volume 11, Issue 2, Autumn 2014, Page 85-164

Determination of Maturity and reproductive cycle of Small Spoted Catshark Scyliorhinus canicula (Linnaeus, 1758)(Scyliorhinidae: Elasmobranchii) From the Syrian marine water

Shadi Jneidi; Haitham Kurbaj; Adib Saad; Malek Fares Ali

Iraqi Journal of Aquaculture, Volume 11, Issue 2, Pages 97-112

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 Spoted 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 (´50 34° 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 subbottom. 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.

Growth of Barbus xanthopterus(Heckel) Juveniles Under Laboratory Conditions

Khalid W. Farnar

Iraqi Journal of Aquaculture, Volume 11, Issue 2, Pages 85-96

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.

Study of Histopathological change in gills of Coptodon zillii as a bioindicator of pollution in Sarragy River In Abu Alkhasiib region

Ali A. A. AL Ali; Khalid Abdul Samad

Iraqi Journal of Aquaculture, Volume 11, Issue 2, Pages 113-124

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 72013 to 112013 and the second season is expansion from 122013 to 62014,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.

Bioaccumulation of heavy metals in Acanthopagrus latus Collected from Iraqi marine waters

H.T. Al-Saad; A.C. Al-Shammary; A. A. Hantoush; G. A. Al-Najare

Iraqi Journal of Aquaculture, Volume 11, Issue 2, Pages 125-138

Concentrations of cadmium, cobalt, cupper, iron, manganese and nickel were determined in four organs (liver, gills, ovaries and muscles) of Acanthopagrus latus, which collected from Iraqi marine waters during the period between November 2010 and October 2011. Heavy metals have been determined by means of Atomic Absorption Spectrophotometry. The fish average weight was 61.2 g and the average length was 144 mm. Nickel showed the highest values in liver, gills and muscles during spring (201.19, 190.00 and 148.00 µg/gm dry weight), respectively. While cobalt showed the lower value (1.12 µg/gm dry weight) in the liver and cadmium showed its lower value (1.23 µg/gm dry weight) in the gills during winter. Muscles showed constant levels of heavy metals, it showed the lower values (not detected) during winter. Ovaries showed high levels for all heavy metals during spring, but its value still instable during the other seasons. This study showed that the concentration of heavy metals distributed in the organs was as follows: liver > gills > muscles > ovaries, while the heavy metals concentration had been distributed during the seasons as follow: winter > spring > autumn > summer.

The effect of starvation on chemical composition of Common carp Cyprinus carpio L.

Qusay Hamid

Iraqi Journal of Aquaculture, Volume 11, Issue 2, Pages 155-164

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 starvation on carcass ash except the last two weeks of experiment.