Azad Saheb

Questions and Answers (30) View all

• Answer added in Reproductive Biology
  12 What is the physiological definition of "sexual maturity" in fish?
  By Starrlight Augustine · Aix-Marseille Université
  Azad Saheb · Kuwait Institute for Scientific Research

  I agree and disagree with the conclusions drawn by different experts here, mainly in the context of aquaculture. The first spawning (release of effect... [more]

  I agree and disagree with the conclusions drawn by different experts here, mainly in the context of aquaculture. The first spawning (release of effective spawanable gametes) that happens in the nature (environmental cues in balance) is not the same what happens in captivity. The fish of the same species might have different age of effective spawning (may not at all spawn in the captive cases..as it happened with the carps, shrimp). The basic driving factor is though the hormonal levels takeing part in the process of reproduction, other environmental stimulii might hinder or activate the process. Even for an intervened process of gamete maturation (the removal of maturation inhibition hormones in shrimp eye stalk is one example) or induction of spawning of mature oocytes (carp ovulation using hormonal injections such as OVAPRIM) there should be a basic readiness of the individuals to be responsive. Hence, I feel its the process of formation of fertilizable gametes that marks the begining of the sexual maturity.
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• Question asked in Diagnostics
  1 Is it that we are better placed to come to know of viral infections now, and this has nothing to do with aquaculture incidences of viral infections?
  Ever since the white spot virus in the shrimp aquaculture came to be identified and researched, I am of the opinion that our capacities of detection a... [more]
  Ever since the white spot virus in the shrimp aquaculture came to be identified and researched, I am of the opinion that our capacities of detection and diagnostics are responsible for the reporting of more viral infection cases in boths shrimp and fish. Though aquaculture stress might have added to the stress and susceptibility of the hosts, the increased incidences should be properly analysed? Were the shrimp or fish not carrying (not detected) the viruses?
  By Azad Saheb · Kuwait Institute for Scientific Research
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• Answer added in Aquaculture
  72 Which sector should be given priority: Aquaculture or open water fisheries?
  By Md. Mosaddequr Rahman · University of Rajshahi
  Azad Saheb · Kuwait Institute for Scientific Research

  I was going through a documentary on National Geographic whcih said the shoaling fish make a come back dramatically if proper fishing restrictions/man... [more]

  I was going through a documentary on National Geographic whcih said the shoaling fish make a come back dramatically if proper fishing restrictions/managerail measures are in place. Can any one tell, is it an indication of good Fish Stock Resource in a given eco-system if the carnivores are see in good numbers and of larger sizes??
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• Answer added in Aquaculture Nutrition
  2 Nutrition and immunity of aquaculture fish!!!
  By Ahmed Kutiet · National Institute of Oceanography and Fisheries
  Azad Saheb · Kuwait Institute for Scientific Research

  Do you want to get more input into these aspects or you have a specific question? this is not clear. Any way, your thinking is right. Aquaculture stre... [more]

  Do you want to get more input into these aspects or you have a specific question? this is not clear. Any way, your thinking is right. Aquaculture stress comples fish to go through many additional energy partitionings to cope with the stress, or spare vital nutrients for this other wise not necessary activity. This makes it go short of supply required for many normal physiological activities including diesease resistance. This makes the fish more susceptible. Extra nutritional doses of nutrients especially the vitamins have been known to enhance immunity and well being. Also some of the trace elements which are utilized for the stress responses, may become limiting and hence increase sensitivity to diseases, such trace elements may also be required in addiotinal quanitities. Many hormone genes go down regulated due to stress.
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• Answer added in Biochemical Engineering
  99 Is the relation between OD reading and cell concentration (cells/mL) of bacteria different in various culture media?
  By Hamed Khodadadi · Eastern Mediterranean University
  Azad Saheb · Kuwait Institute for Scientific Research

  I suggest you to stnadardize your OD against the plate count if you are looking for the viable counts in a defined medium grown for a difeined period ... [more]

  I suggest you to stnadardize your OD against the plate count if you are looking for the viable counts in a defined medium grown for a difeined period of time and under known conditions. This if re-checked when you use a different batch of medium, it will be nice. But surely you have to have the curve for different brands of media.types of media under which you grow the bacterium.
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