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درس نمو وتطور القلب في اسماك الكارب الشائع باستخدام عدة نماذج من اليرقات واليافعات أثناء التلقيح الاصطناعي في مفقس اسماك مركز علوم البحار وبدرجة حرارة حضن بلغت 26 ᵒم، واستغرقت فترة الحضن 38 ساعة، شملت الدراسة الجانبين المظهري والنسيجي لتطور القلب، ولوحظ ظهور بادئات رديم القلب Heart rudiment بعد مرور 22 ساعة من الحضن، إذ أصبح القلب تدريجياً أكثر تمايزاً مع ظهور البطين والأذين فضلاً عن البصلة القلبية. ظهر القلب نسيجياً في عمر 24 و28 ساعة من الحضن على شكل أنبوب صغير غير متمايز، وكان البطين محاطاً بطبقتين من الخلايا، أما الأذين فكان محاطاً بطبقة واحدة فقط، مع تمايز البصلة القلبية. وخلال يوم بعد الفقس تكون القلب من الأجزاء الرئيسية وهي الأذينatrium والبطين ventricle والمجمع الوريدي فضلاً عن البصلة القلبية، وظهرت الصمامات القلبية في عمر 5أيام إلى 8 أيام بعد الفقس، وقد اكتمل تكون القلب بشكل نهائي عند عمر 30 يوماً بعد الفقس، مع تمايز طبقتي عضلة القلب وهما الطبقة الصلدة compact layer والطبقة الحويحزية trabacular layer .

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Effects of feeding ratios (3%, 5% and 7%) on growth and food conversion rate (FCR) of common carp Cyprinus carpio reared in floating cages at Shatt Al-Arab River, Hartha district were studied during a period of 27-4-2010 to 28-6-2010. Statically analysis of results proved that there were significant differences between final weight and length reached by fishes fed on 3% of fish weight and fished fed on 5% and 7% of fish weight. Final weights of fishes were (188, 275.8 and 252.6) g and final lengths were (216.6, 234.6 and 227.2) mm for (3, 5 and 7)% feeding ratio respectively. Better results of growth and FCR obtained from fishes fed 5% of fish weight. Results appeared that FCR values were 4.82, 2.63 and 3.98, daily growth rates were (1.07, 3.16 and 2.78) g/day and specific growth rates were (0.7, 1.85 and 1.71) %/day for fishes fed 3, 5 and 7% of fish weight respectively.

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Pampus argenteus (Euphrasen, 1788) is one of the most commercially important fish in the North Gulf region, Iraq in particular. It's stocks were critically endangered. The study showed the semi-artificial spawning. The mature brooders were collected from the region corresponding to the Khor Al-Zubair. The semi- artificial spawning was done by mixing the sperm and ova of the live fish. It was found that fishes collected in the afternoon were most suitable for semi-artificial spawning. This research was able to diagnose the place and time of spawning fish, and time getting semen and its preservation, time to get mature eggs , access to the mechanism of action and necessary equipment. In addition to planning for subsequent phases of fertilized eggs rearing, hatching and larval rearing.

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The present study was aimed to ecological evolution for the north part of Shatt Al Arab River, by using water quality index (WQI, Canadian Model) because the efficiency of this method to volutes fresh water quality and to determinate the water quality for different uses. This study has been done through the period between December, 2012 to November, 2013; samples were collected monthly during low tide, three stations have been chosen, the first one was near Al Hartha area, the second station was near Al Hartha area and the third station was near Saeed Ali Al Noor Bridge. The present results were showed that water temperature were ranged between 13.8 ºC – 37 ºC and dissolved solids were 100—1670 mg/l, , salinity range were 0.6-2.5 ‰, the range of dissolved oxygen was 5.7-10.7 mg/l, the hardness value was range between 500-1120 mg magnesium ions was 35-93 mg/l, nitrite was 3.5-15 µg nitrogen atom-nitrate/l, the range of phosphate was 0.05-0.5 µg phosphor atom-phosphate /l, phosphorous range was 158-536 mg/l, the range number of faucal bacterial colon was 21-495 CFU/100ml. Water quality index values (WQI) for all study stations, the range was 47-67, these were classified between third (Fair) and fourth (Marginal) categories. Classification of stations was fair for the first station and marginal for the second and third stations.

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Mud crab (Scylla spp.) aquaculture has become an important livelihood option for the coastal fisher-folks in Bangladesh. Mud crabs harvested from wild sources are traditionally fattened in pens installed in tidal rivers, ghers, and earthen ponds in Bangladesh. The study was aimed at understanding the practice and production economics of mud crab farming in the South-West Sundarbans region of Bangladesh, and was conducted in the areas namely Bagerhat, Satkhira and Khulna districts where mud crab fattening are predominately ventured. Most of the farmers fatten both male (lean) and female (gonadally immature) crabs of 100 - 180 g. The crabs are stocked at varying rate (12 - 641 g/m2), and fed at the rate of 8-10% of body weight with trash live fishes, dried fishes, snails, mollusks, and cattle viscera. The fattening for a mean cycle of 22 ± 14.34 days has the survival rate of 55 - 90%, and has the production of 0.065 ± 0.26, 0.084 ± 1.33, and 0.17 ± 3.76 kg/m2 in Bagerhat, Satkhira, and Khulna, respectively. After harvesting (mostly partial), crabs are sold at average price rate of 4.35 ± 0.45 US$/kg. The lowest production cost (3.14 US$/kg) and the better economic return (US$ 147.77) per cycle was recorded in the district of Satkhira. The mud crab fattening has hitherto Abul Farah Md. Hasanuzzaman et al. 58 been evaluated economically feasible in and around the Sundarbans region, but the production and economic efficiency can be scaled up adopting scientifically demonstrated regime of stocking, feeding, and health management. The development of crab seed hatchery, artificial feed for crab, and strongest marketing network are addressed as crux issues for the sustainability of mud crab aquaculture in Bangladesh.

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