Effect of broodstocks numbers on cyst formation of bisexual and parthenogenetic strains of Artemia urmiana habitat

Artemia has important role as live food in aquaculture nutrition. There are bisexual and parthenogenetic strains of Artemia urmiana which are living around the Urmia Lake. Selection of suitable strain for culturing programe must be considered at aquaculture industry. In order to find suitable at both strains for, the evaluation of ovoviviparous and viviparously characteristics must be done. The objective of the present study was to introduce the suitable generation for both characteristics (cyst & nauplii production) in bisexual and parthenogenetic strains of Artemia urmiana at urmia lake, Iran. This research was carried out at laboratory under similar and fixed experimental condition for culture. Each artemia was fed with live Dunaliella tertiolecta species .Adults at each generation were assessed the number for frequency of cyst and nauplii production and mortality rate. Results with using one-way ANOVA &Duncan test by SPSS software were analyzed. The results showed that there is significant difference among 10 generation at bisexual strain of Artemia urmiana for cyst-production and mortality rate (P<0.05) and this variation was not significant for nauplii production.In addition that the seventh generation had high cyst-production and sixth generation had high nauplii-production in bisexual strain. The results showed that there is significant difference among 10 generation for at parthenogenetic strain of Artemia urmiana around urmia lake for cyst and nauplii production and mortality rate (P<0.05). In addition that the seventh generation had high cyst-production and tenth generation had high nauplii-production in parthenogenetic strain. Totally, adults of bisexual strain was suitable for cyst-production and parthenogenetic strain for nauplii-production was suitable. The mortality rate had high at bisexual strain compared to parthenogenetic strain .It can be concluded that the seventh generation for cyst-production were suitable in both strains and sixth generation for nauplii-production in bisexual strain and tenth generation for nauplii-production in parthenogenetic strain were suitable. It is recommended to select seventh generation for cyst-production at both strains and tenth generation for nauplii-production at parthenogenetic strain studied.

Iranian Fisheries Science Research Institute

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