213 research outputs found
Bacterial Flora of Water and Rotifers in Outdoor Mass Culture Tanks Fed with Different Microalagal Diets
Investigations were carried out on the bacterial flora of water and the quality of rotifers in outdoor mass culture tanks.
Brachionus plicatilis and B. rotundiformis were cultured in 10 numbers of 1 tonne tanks and the physico-chemical parameters and
microbial loads of water, and total bacterial and Vibrio loads of microalgae and rotifers, during the period 2014-15, were studied. The
study revealed a significant variation of the ammonia levels and total bacterial loads with different diets (P < 0.05). A positive
correlation was observed between the total bacterial loads of algal concentrations and loads of rotifers, but no correlation was
observed between Vibrio loads of water and rotifers. The prevalence of Vibrio loads of rotifers was low in tanks fed with
Nannochloropsis oculata and maximum Vibrio loads were recorded in Chaetoceros calcitrans fed rotifers. The Vibrio loads
significantly varied with days of culture and also with the algal diets. A positive correlation was observed between the total Vibrio
loads of water and rotifers
Experimental studies on Macro fouling communities on net panels at marine cage farm of Karwar, India
A study was undertaken on the fouling pattern, monthly settlement and species dominance at marine cage
culture during the year 2014-2015. The net panels deployed at three different depths during December
2014 and the study was carried out for seven months. The study revealed wide variations in colonization
of the bio-foulers, the density varied between 2-260/cm2. The overall density was found to be more in
bottom panels (6mt) compared to the top (1mt) and middle panels (3mt). The overall dominant species
were hydroids and barnacles throughout the culture period. In the top panels, hydroids were dominant
(91.67%) during December, followed by barnacles and amphipods. Additionally, complete dominance of
barnacles was observed in the middle panel during May. Barnacles were found dominant (93.75%) on the
bottom panels during March, followed by hydroids and crabs. The study underscored that barnacles
formed a major contribution of the fouling organisms throughout the culture period. Significant variation
in the occurrence and abundance of fouling organisms was observed, between the depths at cage sit
Environmental monitoring in Sea cage culture
Cage culture is a fast growing industry all over the world
and demands good environmental practices to assure
sustainability. The sustained development of coastal aquaculture
has reached a good understanding with the environment,
respecting it and undertaking actions that tend to diminish the
possible impacts that may arise from this activity. In order to do
so, measures are to be taken in production to avoid degrading the
environment, whilst still being appropriate, economically viable
and socially acceptable. In this sense, it has been considered
necessary to develop some basic environmental strategies to assure
the best site for the aquaculture purposes, avoiding possible
confrontations with other coastal uses
Roth Net-Assisted Endoscopic-Guided Manometry Catheter Placement.
High-resolution esophageal manometry (HRM) has become the gold standard to diagnose esophageal motility disorders. Usually, this procedure is performed by introducing the catheter, which has pressure sensors, into the esophagus and proximal stomach via the nares. Repeated coiling of the catheter and inability to pass through the gastroesophageal junction (GEJ) are common challenges encountered. Endoscopy-guided placement of the catheter can overcome these difficulties. However, sometimes even with the use of endoscopy, it is difficult to advance catheter due to anatomical variants. The extreme fragility of the catheter and sensors and the high cost of this reusable device precludes the use of biopsy forceps or snare to advance the catheter. There is no literature on using accessories during endoscopy in case of difficult placement under direct visualization. We report a unique case of using Roth Net via the suction channel to advance esophageal manometry catheter into the stomach by using endoscopy
Abundance of natural fish seed resources prioritized for mariculture in the Kali estuary
Mariculture is a promising fish producing industry
in India with cage farming of marine finfish and
shellfish becoming popular along the entire coast.
Fish seed availability is the need of the hour for
sustaining and supporting expansion of cage farming
of fishes in India. Capture Based Aquaculture (CBA),
can be considered as an economic activity for
fishermen communities to practise where by
accessing natural fish seed resources for culture, it
enhances the fish production, yield and market
value
Exploited resources of major perches in India
The present paper reviews the studies on the exploited resources
of mqjor perches from, the Indian seas. Major perches consist
of fairly large sized fishes belonging to families Serranidae,
Lutjanidae and Lethrinidae, popularly known as rock
cods,snappers and pigface breams respectively. They form 17% of
the total perch catch. The average annual production of major
perches in the country during 1990-98 is estimated as 23,800t.
The highest landing of major perches is from the state ofTamilnadu
(49.5%), followed by Kerala (19.74%). They inhabit the rocky and
coralline grounds of/" the south west and south east coasts and
the Wadge Bank and also in the rocky grounds off Gujarat and
Maharashtra . Along the south west and south east coasts, the
peak fishing season is from December to April. This resource
could be exploited more efficiently by hooks and lines as well as
the traps rather than trawl nets, as the grounds are often not
trawlable
Effect of microalgal diets on filtration and ingestion rates of the rotifer Brachionus plicatilis
Effect of marine microalgal diet on filtration and ingestion rates of Brachionus plicatilis was studied. Marine microalgae viz., Nannochloropsis oculata, Isochrysis galbana, Chaetoceros calcitrans and a combination of N. oculata and I. galbana (Nanno+Iso) at different cell concentrations were selected for the experiment and triplicates were maintained for each feed. Significant difference (p<0.05) was observed in the filtration and ingestion rates of B. plicatilis, between the treatments. Peak filtration rate of 12.2x10-5 cells ml-1 ind-1 min-1 was recorded in B. plicatilis fed with Nanno+Iso, followed by I. galbana. Ingestion rate was found to be significantly high (p<0.05) for those fed with C. calcitrans, followed by Nanno+Iso. Filtration rate was significantly high (p<0.05) in rotifers stocked at an initial density of 50 nos. ml-1 fed with Nanno+Iso. The results indicated that a combination of Nanno and Iso is the best suitable microalgal diet for rotifer with peak filtration (12.2x10-5cells ml-1 ind-1 min-1) and ingestion (5.4x10-3 cells ml-1 ind-1 min-1) rates during the first 60 min
Standardization of culture aspects of Apocyclops cmfri sp. nov. a native cyclopoid copepod
Copepods are considered as ideal larval feed,
due to their smaller size (<100╬╝m), high protein and
favourable fatty acid profiles. There are three types
of copepods viz., harpacticoid, calanoid and
cyclopoid, which can be cultured on a large scale
under controlled conditions as live feed for the
initial stages of fish and shellfish larvae. Karwar
Research Centre of ICAR- CMFRI made a significant
contribution in standardizing the protocols for the
culture of a new cyclopoid copepod
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