At low salinity (below 4 ppt), the proportion of major minerals (Cl, Na, SO4, Mg, Ca, K) is important as well as the absolute concentration for the growth and survival of marine shrimps. Does anyone know this statement still works in brackish water (10-25 ppt)? And what mineral is the most important?
Sorry, in your question, the term "mineral" is used incorrectly.
According to the "Glossary of Geology" is a mineral, without human intervention, (Quotation): "A naturally occurring inorganic element or compound having an orderly internal crystal structure and characteristic chemical composition, crystal forms, and physical properties."
A few exceptions are X-ray amorphous.
There are currently around 5,400 mineral species approved by the IMA (International Mineralogical Association).
What you mean are cations or anion complexes!
Best regards,
Guenter Grundmann
Agus,
The following link should give you a good introduction to the essential elements that are needed for normal function in shrimps.
http://www.fao.org/docrep/field/003/ab470e/AB470E06.htm
I have also attached some papers that you may find interesting.
Tomas
Agus,
Not sure if you have seen the following paper, but in case you have not here is a link:
https://repository.seafdec.org.ph/bitstream/handle/10862/879/ficcpps_p123-130.pdf
I have also attached a few more early papers on prawn culture that discuss the requirements of essential elements in prawn diets. These papers should give you enough information that you will be able to answer your question. After reading these you may agree that asking which essential element is the most important in shrimp diets may not be the right question to ask.
Tomas
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