Paper Information

Journal:   JOURNAL OF SCIENCE (UNIVERSITY OF TEHRAN) (JSUT)   Winter 2004 , Volume 29 , Number 2(A); Page(s) 305 To 316.
 
Paper: 

ETTECTS OF DIFFERENT SALINITIES ON SURVIVAL, GROWTH, REPRODUCTION AND LIFESPAN CHARACTERISTICS OF THREE POPULATIONS OF ARTEMIA FROM IRAN

 
 
Author(s):  LOTFI GORCHIN GHALE V., SEPEHRI H.*
 
* Department of Biology, faculty of science, Tehran University, Tehran, Iran
 
Abstract: 

The effects of different salinities on the survival, growth, reproductive and lifespan characteristics of three Artemia populations from Urmia lake, Maharlu lake and small lagoons around Urmia lake were studied in laboratory conditions. Artemia cysts were collected from the abovementioned lakes and lagoons and hatched according to the standard procedure. Four replicates of 200 newly hatched nauplii were treated in salinities of 75, 100, 125, 150 and 175 ppt. The larvae were fed with algae Dunaliella teriolecta and chemically treated yeast known as Lansy PZ. Survival rate of the Artemia were calculated on days 8, 11, 14, 17, 20 and 23 of growth. Total lengths also were measured on days 8, 11, 17, 20 and 23 of growth using a micrometer and were compared with each other. After attaining the adulthood, thirty pairs of adult Artemia (in case of bisexual spp.) and 30 adult female (in case of parthenogenetic populations) were transferred from all salinities into separate 50 ml falcon tubes to compare their reproductive and lifespan characteristics. The results showed that survival and growth rates decreased with increasing salinity. Reproductive characteristics such as reproduction frequency, total off-springs, number of off-springs in each reproduction and number of off-springs in each day of reproduction period reduced with increasing in salinity. Moreover, higher salinity prolonged the pre-reproductive period but shortened the total reproductive period. Higher salinities also had some impacts on the percentage of encystment, post-reproductive period and life span, but existence of a logic relationships between salinity and these parameters could not be proved.

 
Keyword(s):  ARTEMIA, URMIA LAKE, MAHARLU LAKE, LAGOON, SALINITY, SRUVIVAL, GROWTH, REPRODUCTION, LIFESPAN
 
References: 
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