1,139 research outputs found
A new method to measure the chiral condensate in lattice QCD using Wilson fermions
Parity and flavor symmetry is not broken in QCD. Using this fact, we propose
a new method to measure the chiral condensate in lattice QCD using Wilson
fermions with an operator that breaks parity and flavor in addition to the
chiral symmetry.Comment: 9 pages, LaTeX, no figure
Artemia culture and Cyst production
As environmental factors play an important role in the mode of reproduction of brine shrimp, an understanding of the same is necessary to achieve optimum production of biomass and cysts under natural as well as controlled environmental conditions
Observations on experimental artificial reef constructed at Tuticorin
An experimental artificial reef was constructed in the break-water of Tuticopn Harbour during July-August, 1989 at a
depth of 6 m using discarded lorry tyres. A total number of 23 modules, consisting of 69 tyres and fabricated in lhree
different designs, were used for the reef construction. The reef occupied a bottom area of approximately SO sq.m. with
a height of 0.8 to 1 m. Within a period of one month from the time of construction, autotrophic community dominated
by red algae and heterotrophic community dominated by cirri pedes, in addition to colonization by various groups of
invertebrate organisms, were observed on the reef structure. The inhabitation by fish was observed during the third
month. The behaviour of fish and shellfish" in the artificial reef was observed by SCUBA diving
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Creation of artificial habitat for spiny lobsters in the sea off Vellapatti, Gulf of Mannar
An experimental artificial habitat for spiny lobsters was created in the
sea off Vellapatti, a fishing village near Tuticorin in the Gulf of Mannar during
June 1997. A total of 49 modules fabricated out of 147 stoneware pipes
were used to create the artificial habitat which covered a floor area of
approximately 1000 sq. m. Inhabitation of lobsters in the artificial habitat was
recordedfor the first time three months after the installation of the modules.
Both Panulirus ornatus and P.homarus were encountered in
bottom set gill net catches operated in the vicinity of the artificial habitat
Artificial reef and its role in marine fisheries development
Floating bamboo bundles and piles of stones
kept on the sea bottom have long been used by
traditional fishermen as fish gathering devices in
various parts of the world. These objects provide
living space, shelter for protection from the
predators thus functioning as (i) a habitat for
organisms. The attached algae and other sessile
organisms serve as food especially for young
ones. Thus the area where such objects are placed
function as (ii) a feeding ground. These objects
also act as a suitable substratum for attachment
of eggs in some cases thus functioning as (iii) a
spawning ground. Based on these principles
artificial reefs are constructed in different parts
of the world either to create a new fishing ground
or to improve the production potential of the
existing grounds
On the deep sea prawn resources off Tuticorin
The prawn resources along Tuticorin coast are exploited mainly by three types of gears viz. prawn gill net and thallumadi in the artisanal sector and trawl net in the mechanised sector
On the fishery of the spiny lobster off Tharuvaikulam, Gulf of Mannar
Tharuvaikulam is a fishing village near Tuticorin
on the southeast coast of Tamil Nadu. Fishing by
bottom-set gill nets is carried out off Tharuvaikulam
almost round the year. Normally, the swimming crab
Portunus pelagicus dominates the catches. But at
times lobsters are also encountered in the catches
in good numbers. Two species of lobsters namely,
Panidirus omatus and P. homarus constitute the
lobster fishery off Tharuvaikulam coast
The spiny lobster resources in the trawling grounds off Tuticorin
There are six species of spiny lobsters ofcommercial importance in Indian waters, out of which only three species namely Panulirus polyphagus, P.omatus and P. homarus contribute significantly to the commercial fishery along certain parts of the Indian coasts
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