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Articles by A.M. Abdelhamid
Total Records ( 2 ) for A.M. Abdelhamid
  A.I. Mehrim , A.M. Abdelhamid , I.A. Radwan and A.F. Abdelhamid
  African catfish, Clarias gariepinus, is a highly appreciated species for aquaculture. So, the present research was carried out to study the possibility of improving artificial reproduction of African catfish C. gariepinus brood stock by injection with some stimulating preparations. Females and males were divided into five treatments (T), each treatment had five females and two males, the females only were injected; T2, was injected with imported Pregnyl®; T3, was injected with imported Argent®; T4, was injected with native carp pituitary gland and T5, was injected with native catfish pituitary gland; but T1, set as a control, without injection. The obtained results revealed that the ovary length was significantly (p≤0.05) longer in T2, T3 and T4 than in T1 and T5. Also, T3 gave the highest Absolute Fecundity (AF), being 119917 and T2, T4 and T5 also represented higher AF, being 7.6, 7.8 and 3.9 times, respectively than T1. Yet, T3 gave the highest Relative Fecundity (RF), being 126.4 which was 8.5 times than T1. There were significant differences among treatments for serum FSH, LH and progesterone (P4) but not for estrogen. Treatment No. 2 reflected the highest (p≤0.05) level of FSH and LH among all treatments but P4 level in each of T2, T3 and T5 was significantly higher than T1 and T4. Histological examination of ovaries revealed normal structure of ovarian lamellae among all treatments and various development stages of oogenesis were observed. So, it could be concluded that T3 followed by T2 and T5 were the best treatments for improving the reproductive performance of C. gariepinus concerning the significantly heaviest egg weight and highest AF, RF, serum FSH, LH and P4 than T1 and T4.
  A.M. Abdelhamid , A.I. Mehrim , A.A.M. Abdel Hamid and M.E. El-Katan
  Fish are one of the most extensively distributed organisms in the aquatic environment. A field study was conducted for 102 days at feeding period. A 100 fish/net-Hapa (Nile tilapia, silver carp, common carp and African catfish) were stocked at a rate of 1: 1: 1: 1 using a polyculture system. Two experimental net-Hapa/treatment were used, one treatment as a control fish fed a commercial diet and the second one fish were fed a Dried Sewage Sludge (DSS), product of treating sanitary and agricultural drainage of Al-Reiad city, Kafr El-Sheikh, Egypt). At the end of the experiment, blood samples were withdrawn for measuring the hematological and serum biochemical parameters, also liver samples were taken from each fish species for histopathological examinations. From the obtained results, it was clear that DSS feeding did not negatively affect the blood picture in general, although the significantly elevated values of transaminases activity and triglycerides concentration. The DSS feeding led to some drastic histological alterations in the liver structure. Conclusively, the presence of some pollutants from agricultural and urban drainages whether in the rearing water or in DSS that can negatively affect fish health, production and quality as well as could be inter the food chain and threat human health; so, it is recommended to give more concern on food and water quality (environmental friendly) used in aquaculture to offer more safe products for human consumption.
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