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Re: decapsulation & raising Artemia nauplii
Hello hut,
decapsulation is the removal of the outer shell of the cyst by means of a
complete oxydation of the cyst shell. It saves some energy the emerging
nauplius needs for breaking through the shell, it lowers the bacterial count
in the hatching medium and you will prevent the introduction of
non-digestable cyst shells in your fish tank. These shells might obstruct
the digestive tract of fish (larvae). Decapsulation requires some practice
and I wouldn't recommend it for a beginner. It is helpfull, but not
mandatory. Hatching the nauplii followed by siphoning the nauplii out of the
hatching container and careful rinsing of the nauplii under tapwater will be
sufficient.
Raising Artemia nauplii to adulthood is far from easy and extremely time and
labour consuming. You can find more info on this subject at
http://www.sfbb.com/technical_info/Growing.htm
Quality of freeze dried foods generally is of a slightly lesser quality
compared to frozen foods or dry foods, e.g. it oxydises more quickly and
some compounds (e.g. certain enzymes) might be destroyed. I did not read
anything yet on that change to the shell during freeze-drying you mentioned.
Are you talking about the Artemia shell? Their exoskeleton is nearly
non-existent.
Regards,
Steve Geerts
Biologist San Francisco Bay brand
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