February 15-18, 2009 Washington State Convention Center Seattle ...

NEW CONCEPTS FOR STUDY ON SURVIVAL, GROWTH AND REPRODUCTIVE
CHARACTERISTICS OF BRINE SHRIMP Artemia (CRUSTACEA: ANOSTRACA)
Alireza Asem
Protectors of Urmia Lake National Park Society (NGO)
Urmia, Iran
alireza_1218@yahoo.com
Many studies on survival, growth and reproductive characteristics of Artemia populations have been done with biological and
economical approach. But there is very serious problem to determine about optimum conditions for getting best biological results
according to these studies. Sometimes data and results don’t match together. For example; in some study, it was observed
that survival decrease in a definite salinity though percentage of maturity increase or offspring rise in a specific salinity but
growth reduce and etc. Therefore some new concepts and their formulae are suggested here for solve these problems. Survival
is an important item for economical and biological decisions so Coefficient of Survival is proposed as factor.
1) Coefficient of Survival: CS =
No. of remained Artemia
total No. of cultured Artemia
Now this factor can qualify growth and reproductive characteristics for any comparison.
2) Maturity Index = CS *
total No. of maturated Artemia
No. of remained Artemia
3) Growth Index = mean of total length * CS
Because all animal reproduce after maturation and for any study on reproductive
characteristics of Artemia used maturated samples so CS must calculate when all
individuals are maturated (CS%100).
4) CS%100 =
No. of maturated Artemia
Total cultured No.
5) Offspring Index = CS%100 * total offspring
6) Nauplii produced Index = CS%100 * total nauplii produced
7) Cyst produced Index = CS%100 * total cysts produced
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