725 research outputs found
Status of the fishery and resource characteristics of Carangids along the Indian Coasts
A consistent increase was observed in carangid production with minor fluctuations from a nominal
24,560 tin 1969 to 1,36,094 t in 2004 with a peak p!'oduction of 1,96,832 t in 1995. Carangids were the third
major pelagic resource constituting 5.5% of the total all India fish production next only to mackerel and oil
sardine. The average annual catch of carangid was 1771.2, 4940.5, 922.6, 4199.5, and 1856.5 t at Veraval,
Mangalore, Kochi, Tuticorin and Kakinada respectively. The small-mechanised trawl is the most effective
gear in exploiting the carangids along both the coasts
Hypoxic Culture Conditions as a Solution for Mesenchymal Stem Cell Based Regenerative Therapy
Cell-based regenerative therapies, based on in vitro propagation of stem cells, offer tremendous hope to many individuals suffering from degenerative diseases that were previously deemed untreatable. Due to the self-renewal capacity, multilineage potential, and immunosuppressive property, mesenchymal stem cells (MSCs) are considered as an attractive source of stem cells for regenerative therapies. However, poor growth kinetics, early senescence, and genetic instability during in vitro expansion and poor engraftment after transplantation are considered to be among the major disadvantages of MSC-based regenerative therapies. A number of complex inter-and intracellular interactive signaling systems control growth, multiplication, and differentiation of MSCs in their niche. Common laboratory conditions for stem cell culture involve ambient O-2 concentration (20%) in contrast to their niche where they usually reside in 2-9% O-2. Notably, O-2 plays an important role in maintaining stem cell fate in terms of proliferation and differentiation, by regulating hypoxia-inducible factor-1 (HIF-1) mediated expression of different genes. This paper aims to describe and compare the role of normoxia (20% O-2) and hypoxia (2-9% O-2) on the biology of MSCs. Finally it is concluded that a hypoxic environment can greatly improve growth kinetics, genetic stability, and expression of chemokine receptors during in vitro expansion and eventually can increase efficiency of MSC-based regenerative therapies.Article Link:
http://www.hindawi.com/journals/tswj/2013/632972
Identification and characterisation of fisheries management units
This is a discussion paper on the identification of Fisheries Management Units (FMU) in Tamil Nadu and Puducherry.
The choice of fisheries management units or FMUs depends on many factors like fisheries resource configuration,
structure of the fisheries, availability of information, institutional aspects and the scale or level at which one can
make a significant contribution to the management goals and objectives. Six possible FMU were identified based
on various groupings such as fish resources, gear based, fleet based, geographical, harvesters and subsectors, and
combinations of these as the seventh FMU. The prospects of each type of FMU in the TN & P context are discussed
in detail in this paper
Fisheries Management Options for Tamil Nadu & Puducherry
The specific aim or output of the work package on fisheries management is to “define a new fisheries management
system” for Tamil Nadu & Puducherry (TN & PC) since it is an essential tool for achieving the long term
development goal of the project. The approach was a mixture of (i) expert consultations with fishery biologists,
fishery statisticians, academics, fisheries NGOs, fisheries officials, (ii) review of fisheries management with available
current information, (iii) a detailed analysis of catch data species wise, district wise and sector wise (mechanised,
motorised and non-motorised) and (iv) an exercise to identify potential Fisheries Management Units (FMUs) and to
develop a detailed characterization of them. Based on the above, fisheries management options for TN & PC have
been worked out and presented in a state level multi-stakeholder workshop and subsequently refined. This report is
the outcome of this process
Supplementary Papers on Fisheries Management
There are myriad laws and regulations that have some impact on marine fishing in Tamil Nadu and Puducherry.
Obviously, the most important is the MFRA. Increasingly, environmental laws are having a significant impact as are
regulations by seafood importing nations and trade related instruments brought in by the WTO. A major central law
is also in the making. The plethoras of laws (and agencies implementing them) also mean that there is considerable
overlap and lack of coherence. There is no mechanism at the moment to ensure that they all converge towards a
common understanding and vision for fisheries management.
An important factor that cannot be ignored is that the large traditional fishing community has its own laws and
independent system of management that has a huge influence on how constitutional laws get implemented
Tuna Fishery and Stock Assessment of Component Species off Chennai Coast
All India tuna production continued to increase with fluctuations from 848 t in 1951 to
64,006 t in 2006, with a peak production of 64,006 t in 2006. During 1985-2006 it varied from
27,148 t in 1985 to 64,006 t in 2006 with annual average landings of 39,937 t. Annual average
tuna production by different maritime states was 17,041 t (42.7%) by Kerala, 5,615 t (14.1%)
by Gujarat, 5,000 t (12.5%) by Tamilnadu, 2,741 t (6.9%) by Lakshadweep, 2,812 (7.0%)
Karnataka, 2,716 t (6.8%) by Maharashtra, 2,009 t (5.9%) by Andhrapradesh, 1,095 t (2.7%) by
Goa, 444 t (1.1%) by Andaman & Nicobar Islands, 262 t (0.7%) by Pondicherry, 134 t (0.3%) by
Orissa, 68 t (0.2%) by West Bengal. Tamilnadu catch varied from 1,336 t in 1985 to 10,912 t in
2006 with an average of 5,000 t forming 1.4% of total marine fish production during 1985-2006.
Species composition of all India tuna catch was Euthynnus affinis (51.2%), Katsuwonus pelamis
(4.1%), Thunnus tonggol (10.4%), Auxis spp. (20.7%) and other tunnies (13.6%) and the species
composition of Tamilnadu was E. affinis (59.7%), K. pelamis (11.5), Auxis spp. (12.5%), T.
tonggol (5.5%) and other tunas (10.8%)
Marine Fish Production in Tamil Nadu & Puducherry. A Report based on a detailed analysis of Central Marine Fisheries Research Institute Data
Continuous growth in TN marine fisheries is observed in the form of introduction of new fishing vessels, fishing
methods, new fishing gears and development of different infrastructure since 1950 leading to a five-fold increase in
catch and three-fold increase in active fishers. There is a continuous expansion of fishing operation to deeper and
distant waters. There has been a continuous discovery of new fishing grounds, new fishery resources and new fishing
methods. The entire shelf area off Tamil Nadu (TN) coast is covered by TN fishing fleet and there is no scope for
additional catch from the shelf area.
The landings grew continuously till 1997, witnessed a sharp fall during 1998-2004 and then a sharp increase in the
following years 2006-09 hitting the new peak of 5.39 lakh tonnes well beyond the potential yield estimate of 4.25
lakh tonnes by CMFRI. A section of the TN fishing fleet depend heavily on fishing in neighbouring waters and
nearly 20% of the catch comes from South Andhra and Sri Lankan waters. Deep sea fishing is already in vogue in
TN as Kanyakumari’s Thoothoor fishers with a fleet of approximately 500 long-liners cum gillnetters reigning all
over the west coast and landing their catch at Kochi. Chennai gillnetters and a tiny fleet of long-liners in Puducherry
have already started fishing beyond the shelf on the east coast
Role of Women in Fisheries in Coastal Eco-System of Andhra Pradesh, Karnataka, Kerala and Tamil Nadu
Fish eaters in the study area comprise 47 per cent of the total population ranging from 237 per
cent in Tamil Nadu to 85 per cent in Kerala. Though the position of Tamil Nadu in terms of number of
coastal districts and possession of coast line including the number of landing centres, is envious, the
number of fish eaters in the state is minimal. Andhra Pradesl') employs 32 per cent of its fisherwomen in
fish curing/drying/net making and 27 per cent in processing plant works
Exploited seerfish fishery resources of India - A review
Seerfishes forming 1.7 % of the total marine Jish catch of the
country are considered as one of the high value resources Andhra
Pradesh (14.3%) and Tami Nadu (11.5%) on the east coast and
Gujarat (22.8%). Maharashtra (16.9%) and Kerala (16.1%) on the
west coast are the principal contributors of seerfish. They are caught
mainly in gillnet (65.12%) and hook & line (6.96%) from 25-50 m
depth zone and. in trawl (11.47%) operated from beyond 50 m depth.
Of the five species available in Indian waters, the fishery is sustained
by the king seer Scomberomorus commerson and the spotted
seer S.guttatus. The stock assessment studies on the king
seer revealed that the present yield in different regions of the country
are closer to MSY. However there is scope for stepping up production
by extending fishing operations to the deeper waters beyond
50 m depth. The paper reviews their fishery, biology and stock
characteristics in Indian waters
Fishery and population characteristics of Indian mackerel, Rastrelliger kanagurta (Cuvier) at Kakinada
Indian mackerel, Rastrelliger kanagurta is exploited by trawls and gillnets
along Kakinada coast. Its production increased from 67 t in 1988 ’99 to 3,493
t in 1997 ’98. Period of peak abundance and fishery was February-March while
recruitment was high during December-January. Length weight relationship
showed that females were slightly heavier than males of the same size. Growth
parameters, L∞ and K were estimated as 286.3 mm and 1.89/year respectively.
Natural mortality of the stock was 2.61. Total mortality varied between 4.69
and 9.29 and fishing mortality between 2.08 and 6.68. Stock varied during the
period between 1,814 and 5,255 t and biomass between 268 and 902 t. Maximum
sustainable yield is 2,239 t. Emax is 0.77, whereas exploitation rate varied
between 0.44 and 0.72. These indicated that the resource is currently under
moderate fishing pressure especially from trawls and has only marginal
scope for further increase in production. Since further increase in effort by
trawls would be detrimental for the resource it is recommended to reduce their
effort marginally or to maintain at the present level, whereas effort by gillnets
can be increased
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