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Studies on certain selected Live feed organisms used in Aquaculture with special Reference to rotifers (Family: Brachionidae) (TH 118)

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Relation http://eprints.cmfri.org.in/7194/
 
Title Studies on certain selected
Live feed organisms used in
Aquaculture with special
Reference to rotifers
(Family: Brachionidae) (TH 118)
 
Creator Anitha, P S
 
Subject Aquaculture
Theses
Rotifer
Feed
 
Description The present study focuses on the taxonomy, ecology and biology of rotifers
along the south-west coast of Kerala, India. Species composition, population
density and distribution of rotifers in relation to various abiotic and biotic
parameters were investigated at three stations in Veli - Aakulam and at two
stations in Poonthura estuaries from February 2000 to January 2001 . Based on
a review of the history of taxonomy, a comprehensive and systematic study on
brachionid family was conducted realizing its importance as potential live feed
in aquaculture practices in India. Forty four species of rotifers belonging to 16
genera and 12 families are recorded. Among these, Brachionus dichotomus
reductus, B. kostei and B. urceolatis nilsoni are new records for India and B.
quadtidentatus mirabilis and B. calyciflorus borgerti are new records for Kerala.
The three species under the B. plicatilis complex are taxonomically segregated
and redescribed. Similarly, B. havanaensis trahea is recovered and redescribed
from India for the first time. Its earlier name was B. forficula keralaiensis from
Irinjalakuda (Kerala) as a variety of B. forficula. Many are common and
cosmopolitan. Presence of B. dichotomus reductus and B. kostei in Indian
waters, considered earlier as endemic Australian species, has thrown new light
on the discontinuous distribution as well as the close affinity of the fauna
between India and Australia. The impact of physico - chemical parameters and
algal blooms on the occurrence, abundance and species composition of rotifers
in two estuaries are delineated. Salinity and nutrients significantly correlate with
the estuarine abundance while algal blooms appear to be the most important
, factor especially in Veli-Aakulam. B. angulatis, B. plicatilis, B. calyciflorus and
F. longiseta are the dominants in Veli-Aakulam, whereas B. angulatis, B.
calyciflorus, Keratel/a cochleatis and Polyarthra vulgatis in Poonthura. High
population density resulted in low species diversity and vice-versa in the study
area. The impact of salinity, temperature, feed type and feed concentration on
reproductive potential and life table parameters of six brachionid rotifers namely
Brachionus angulatis, B. caudatus, B. calyciflorus, B. plicatilis, B. murray and
B. rotundiformis are studied. Of these, population dynamic studies on B.
angulatis, B. caudatus and B. calyciflorus in India are conducted for the first
time. The results suggest that all the variables significantly influenced the
reproductive potential, fecundity, lifespan and growth of the species individually
and in turn interacted with each other in varying magnitudes. The optimum
salinity for the maximum production of B. angulatis, B. caudatus and B.
calyciflorus is registered at 0.5 ppt, whereas the same for B. plicatilis, B. murray
and B. rotundiformis is at 5 ppt, 10 ppt and 15 ppt respectively. The influence of
finfish (Ttichogaster leen) larval age on the rotifers of different sizes illustrated
a significant relationship between the larval age and size of the prey. The
suitability of rotifers as live feed for the tiger shrimp (Penaeus monodon) larvae
is evaluated and the survival is significantly higher in the diet with rotifer group
than in the diet without rotifers.
 
Date 2003
 
Type Thesis
NonPeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/7194/1/TH-118.pdf
Anitha, P S (2003) Studies on certain selected Live feed organisms used in Aquaculture with special Reference to rotifers (Family: Brachionidae) (TH 118). Doctoral thesis, Central Institute of Fisheries Education, Mumbai.