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Characterization of brine shrimp Artemia from Sri Lanka



Characterization of brine shrimp Artemia from Sri Lanka



Journal of the National Science Council of Sri Lanka 23(4): 153-160



Biometrical characteristics of Artemia, such as naupliar size, determine its acceptability as a 'live feed' by specific-sized larvae in aquaculture hatcheries. In Sri Lanka, a parthenogenetic strain of the brine shrimp, Artemia parthenogenetica, occurs naturally in salterns. Biometrics of Artemia from different sources were characterized and compared using natural populations from salterns in Palavi (PAL) and Mahalewaya (ML) as well as pond-cultured populations of Artemia parthenogenetica (PAL89 and PAL90) and San Francisco Bay Artemia (SFB). The hydrated cyst diameter varied from 248.7 +- 0.82 mu-m in PAL90 cysts to 266.4 +- 0.9 mu-m in PAL89 cysts. The decapsulated cyst diameter varied from 236.5 +- 0.76 mu-m in PAL89 cysts to 245.3 +- 0.90 mu-m in PAL cysts. The naupliar length ranged from 423.9 +- 3.01 mu-m in PAL90 nauplii to 437.4 +- 1.84 mu-m in PAL nauplii. Chorion thickness of cysts and the dry weight of nauplius ranged from 3.0 to 14.95 mu-m and from 2.21 to 2.52 mu-g, respectively. Hydrated and decapsulated cyst diameters and the naupliar length of SFB Artemia were significantly smaller (p lt 0.05) than those of Sri Lankan Artemia originating from the two different sources. Cyst diameters (both hydrated and decapsulated) and naupliar lengths of natural populations from Palavi were significantly smaller than those from Mahalewaya populations. The differences in biometrical characteristics of Artemia cysts and nauplii reported here for natural and pond-cultured populations in Sri Lanka provide the necessary data to meet the live-feed size requirements of specific fish and larval stages in commercial hatcheries.

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