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Conducive conditions for the hatchability of freshwater fairy shrimp Streptocephalus dichotomus (Baird) diapausing cysts

Amutha, C and Subramanian, P (2008) Conducive conditions for the hatchability of freshwater fairy shrimp Streptocephalus dichotomus (Baird) diapausing cysts. Biochemistry and Cell Arch., 8 (2). pp. 245-248. ISSN 0972-5075

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Abstract

The freshwater fairy shrimp Streptocephalus dichotomus cysts are propounded to be an ideal live feed for fresh water hatchery, as Artemia species in salt water hatchery. Present study was designed to understand the rate of Streptocephalus dichotomus cyst hatchability with respect of different type of waters (pond water, tap water, distilled water and rain water) and the changing water parameters like temperature, pH and salinity. In this regard six different levels of temperature (ranging from 24 to 34°C), pH (ranging from 0.6 to 9.0) and salinity (ranges from freshwater to 5 ppt) were experimented. The obtained results showed that S. dichotomus cyst exhibit a maximum level of hatchability in the optimum temperature range of 26-28°C, pH 7.0-8.5 and salinity below 1 ppt respectively. In addition it was found that the hatchability was in the hierarchy of distilled water > rain water > pond water > tap water. Moreover the eggs in suspension yield more hatchability and the floating and settled eggs were not hatched. The floating eggs are unviable one where as if the se4ttled eggs needs decapsulation to hatch.

Item Type: Article
Uncontrolled Keywords: Fairy shrimps; Sreptocephalus dichotomus; diapausing eggs
Subjects: Oceanography > marine biology
Divisions: Annamalai Univ - Marine Biology
Depositing User: CASMB
Date Deposited: 10 Mar 2010 08:14
Last Modified: 10 Mar 2010 08:14
URI: http://moeseprints.incois.gov.in/id/eprint/59

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