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Articles by Fatma A. Abdel Razek
Total Records ( 2 ) for Fatma A. Abdel Razek
  Fatma A. Abdel Razek , Marwa I. Farghaly , Jehan Sorour and Azza Attia
  Background and Objective: Despite its abundance and commercial importance, little is known about the biology of the blue swimmer crab, Portunus pelagicus (Linnaeus, 1758), of the Egyptian waters. The study aimed to characterize the maturation stages of male and female P. pelagicus through external morphological and histological examination during gonad development, with determination of gonadosomatic index (GSI), size at first sexual maturity and spawning population from Alexandria coastal waters of Egypt. Materials and Methods: The current study investigated the sexual maturity and other reproductive biology characteristics of P. pelagicus from the Egyptian Mediterranean coast off Alexandria during the period from March, 2015-February, 2016 and the data were statistically analyzed, represented in mean and standard deviation. Results: The length-weight relationships of males showed nearly an isometric pattern of growth, whereas, in females they revealed a marked departure from isometric growth. Female gonadal development stages were morphologically and histologically investigated, they were comprised of five stages, while three development stages were recorded for male. The size at which P. pelagicus reached sexual maturity was at 107.6 and 96.1 mm carapace width (CW) for males and females, respectively. Ovigerous female showed a prolonged occurrence during the warm months, from March-October. Conclusion: According to gonad maturation, GSI and the occurrence of ripe and ovigerous females, two peaks of spawning activity were detected, in April-May and in August-September. Hence, it is reasonable to say that ovigerous females may spawn more than one time throughout the year.
  El Sayed A.E. Hamed , Hamdy Omar Ahmed , Fatma A. Abdel Razek , Mohamed M.A. Zaid and Tarek A.A. Mohammed
  Objective: The life cycle of Cymadusa filosa under experimental laboratory conditions in the Red Sea-Egypt. Methodology: Five of the ovigerous females collected from the coastal zone in front of the National Institute of Oceanography and Fisheries (NIOF) (27°17'09 N, 33°46'07 E) in Hurghada-Red Sea between summer, 2010 and middle of winter, 2011 were of a length that ranged between 8.0-9.0 mm. Each female was separated in a water tank with a capacity of 3 L and was fed different types of micro-algae. The water was changed daily (the rate of water changed was about 1/2 tank) and the follow-up process stages were from the hatching to the juvenile. Results: There are two identical periods throughout this experiment. The first period: The developing part after releasing juveniles; the aim of the experiment is to take care of juveniles to reach sexual maturity (ovigerous females) and then hatch directly into juveniles. The second period: The days taken between hatching (G0, 1) to (G0, 2) were 12-15 days, (G0, 2) to (G0, 3) were 7-10 days and (G0, 3) to (G0, 4) were 8-10 days of the ovigerous females. Conclusion: The total experimental period of the life cycle of C. filosa was (77-83 days). The fecundity of Cymadusa filosa was estimated by the number of juveniles released by a female. Females were able to carry eggs at a size of 6.50 mm. During the study, a curve linear represented the relationship between the number of juveniles and the size of ovigerous females C. filosa, it was a significant positive correlation.
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