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Studies on the reproductive biology of two species of brine shrimps under different eco-physiological conditions (TH 101)

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Relation http://eprints.cmfri.org.in/7175/
 
Title Studies on the reproductive biology of two species of brine shrimps under different eco-physiological conditions (TH 101)
 
Creator Soniraj, N
 
Subject Theses
Fish biology
Prawn and Prawn fisheries
 
Description There are asexual Artemia parthenogenetica (Barigozzi 1974)
and sexual Artemia franciscana (Kellog 1906) species available at the
saltpans of Tuticorin and the chances of dominance of either of these species
can not be ruled out. Sexual species is believed to have entered the saltpans
because of contamination from the local hatcheries where the imported cysts
are being used. Here an attempt was made to study the effect of
ecophysiological conditions such as salinity, temperature, starvation , different
feeds and feeding levels, photoperiodism etc. on the biology of these two
species of Artemia. Sexual species has the advantage of dominating the
indigenous asexual species as they had performed better in most of the
conditions studied. At fixed temperature the asexual species had a better
brood size than the sexual species but at ambient temperature the sexual had
larger brood size. The pre reproductive period of asexual species at higher
salinities was less than the sexual species, while at lower salinities the sexual
had shorter pre reproductive period. The brood sizes of asexual species were
also large than the sexual species at higher salinities while at lower salinities
sexual species had larger broods. Therefore rather than a complete
dominance of either of these species the sexual species may dominate in the
winter/rainy season and the asexual one in the summer season . The
oviparous mode of reproduction by the asexual species at lower temperature
also supports this view as the sexual species could produce nauplii offspring
even at this temperature. In laboratory rearing of Artemia algal feeds like
/sochrisis sp. or ricebran were found good for biomass production as the
fecundity was high with these feeds. Low temperature could induce cyst
production in both sexual as well as asexual species, while the asexual
responded more positively to low temperature of 25°C as they never turned
back to ovoviviparous mode of reproduction. Algal feeds favoured the
encystment rate, while ricebran fed animals could never produce cysted
offspring. Temperature and feed were found to be the major factors, which
influence the encystment while salinity increase and photoperiodism can only
enhance the cyst production rate.
 
Date 2002
 
Type Thesis
NonPeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/7175/1/TH-101_Son.pdf
Soniraj, N (2002) Studies on the reproductive biology of two species of brine shrimps under different eco-physiological conditions (TH 101). ["eprint_fieldopt_thesis_type_phd" not defined] thesis, Central Institute of Fisheries Education, Versova.