14 research outputs found
Impact of particle size of ingredients in compounded diets on pellet stability and performance in Penaeus indicus H. Milne Edwards
The impact of particle size of ingredients in a research diet and a practical feed in the water stability of pellets. Their
digestibility, growth, and food conversion ratio in the prawn Penaeus ;ndicus were investigated. The research diet
consisted of casein, code liver oil, sucrose, starch, cellulose and other additives while the practical feed was made
up of prawn waste mantis shrimp (Squilla), fish meal, groundnut oil cake and tapioca. Casein in the research diet
and prawn waste, mantis shrimp, and groundnut oil cake in the practical feed were prepared into panicles of 500,
420,300,250,2 10, 100, and 50 gm and dry pellets were prepared with ingredients in each size
Aluminium induced physiological and biochemical changes in freshwater fish Cyprinus carpio Var.Communis
Qualitative aspects of toxicology are important because they are
fundamental to the safety evaluation process in which, one first determines the
toxicologic profile of the substance and then establishes how the chemical can be
employed safely to prevent injury (Plaa, 1982). According to Durham (1974), toxicity
is the ability of a chemical molecule or compound to produce injury once it reaches
susceptible site which is determined by the dosage. Cairns (1984) reported that from a
regulatory point of view, toxicity tests are used for three major purposes; they are 1.
screening of chemicals and products, ii. establishing limits and iii. monitoring; the
author further stated that bioassay test can be used to establish the maximum
acceptable concentration of a pollutant in a given environment without deliberate
application of the chemical causing any unfavourable biological consequences
Holding and spawning of the edible oyster Crassostrea madrasensis during off season
Production of seed from the hatchery throughout the year would help to undertake
stocking in the grow out systems at appropriate time which may vary in different areas. Ripe oysters with a size range of 70-120 mm were collected from Korampallam creek near Tuticorin. Thus holding the ripe oysters is a promising line of work for getting spawn in the hatchery outside the spawning period, leading to seed production throughout the year
Microalgal species as feed for conditioning adult oyster Crassostrea madrasensis (Preston)
The rate of removal of different microalgal cells in suspension at specific time interval in respect
of six species differing in sizes such as Tetraselmis sp, Cheatoceros sp, Chlorella sp, Dicrataria sp.,
Isochrys sp, Chromulina sp, by Crassostrea madrasensis has been studied. The study revealed that often exhibit a signifiant degree of selectivity in the rate of filtration of certain algae. Further it is recorded that the filtration rate is not uniform throughout the experimental period of 24 hours. Oysters showed periods of high filtering activity and periods of relative quiescence
Characterisation of tropical reservoirs in Tamil Nadu, India in terms of plankton assemblage using multivariate analysis
The ecological status of reservoirs in Tamil Nadu, India was studied in view of their importance in culture based fisheries.
The abundance and distribution pattern of plankton assemblages with respect to important water parameters was selected to
characterise the reservoirs. Sampling was carried out seasonally in 22 reservoirs widely ranging in trophic state, during 1993
to 2004. A definite distinction was observed between Western Ghats (WG), rain shadow (RS) and plain land reservoirs (PL)
based on plankton communities and environmental factors analysed. Western Ghats reservoirs lying at the head stream of rivers
tend to show chemically oligotrophic to mesotrophic status with characteristic dominance of phytoplankters viz., chlorophyta,
Selenastrum spp., Ankistrodesmus spp., bacillariophyta, Navicula spp., Nitzshia spp. and Synedra spp. and zooplankton, rotifer,
Brachionus spp. and copepod, Diaptomus spp. Eutrophic to hyper-eutrophic status with dominant presence of cyanophyta,
Microcystis aeruginosa in all the seasons and lesser presence of Spirulina spp. was observed in many plain land reservoirs while
others with low anthropogenic pressure were sub-dominant with bacillariophyta, Nitzshia spp., Synedra spp. and Navicula spp.
and chlorophyta Scenedesmus spp. and Selenastrum spp. Blooms of Microcystis aeruginosa occurred in shallow plain reservoirs
receiving agricultural, industrial and municipal run-off during monsoon. Rain shadow reservoirs depicted early eutrophy stage
as estimated through Carlssons Trophic State Index, represented by species of two groups, chlorophyceae and myxophyceae,
distribution being influenced mostly by habitat characteristics. Principal component analysis (PCA) suggested that secchi disc
transparency and nutrients were important variables determining the ecological status of the reservoirs. The overall division
of the reservoirs is explained by species environmental relationship using BIOENV (Primer 6), which described the positive
correlation of temperature, specific conductivity and hardness to plankton composition and numerical abundance. Some plain
reservoirs move out of their group to assume a solitary position exhibiting different plankton composition with respect to
hydrological characteristics
Indian edible oyster
In India pioneering attempts were made by James Hornell
in 1910 in developing Oyster culture in the erstwhile Madras
State. Scientific investigations were undertaken during early
70's by the Central Marine Fisheries Research Institute, at
Tuticorin. The Institute has conducted R & D programmes on
all aspects of Oyster farming during the last two decades,
culminating in a wealth of informations on the technology of
Oyster farming. The Brochure outlines various aspects of the
technology of farming of the Indian Edible Oyster or the Indian
Backwater Oyster Crasaostrea madrasensis (Preston} including
information on biology, ecology and economics of Oyster
farming
Renaissance in Fisheries: Outlook and Strategies - Book of Abstracts 9th Indian Fisheries Forum, December 19-23, 2011, Chennai, India
The Asian Fisheries Society тАУ Indian Branch (AFSIB) since its inception in 1986, has been providing
a platform for discussion at the national level on issues related to research, development, education
and policies by organizing Indian Fisheries Forum (IFF) every three years in different parts of the
country. The 9th Indian Fisheries Forum (9th iff) will be hosted by the Central Marine
Fisheries Research Institute (CMFRI), at Chennai during 19-23 December 2011. The
main theme of the 9th iff is тАЬRenaissance in Fisheries: Outlook & StrategiesтАЭ. It would have a
comprehensive look for the fisheries and aquaculture sectors, for achieving greater synergy among
the stakeholders and planning strategies for capture fisheries and aquafarming to build higher
levels of sustainability and profitability. The forum would also address the issues of impact of climate
change and its mitigation, resource constraint and species diversification for the expansion of fish
production activity; and encourage young scientists to undertake need-based and resource specific
research. An international symposium sponsored by the Bay of Bengal Large Marine Ecosystem
(BoBLME) is scheduled to be held during the forum on 21 December, 2011 with theme: Bay of
BengalтАУEcosystem Approach to Fisheries Management
я╗┐Seasonal gonadal changes, spawning and condition index of oyster Crassostrea madrasensis (Preston) in the Korampallam creek, Tuticorin
я╗┐Seanod changca in the gonad of edible oyrter Crassosma madmsensis were oberved hir-
tologically in samples colleated &om Korampallam creek during February 1987 to January 1988.
Two peak spawning reasons wore observed in March and September. Gametogenerir atarted in
May 1987 and ripe atagea wore noticed from September 1987. Spawning occurred during Sep-
tember to Ootober. A second cycle of gametogenerir began during November 1987 and higher
percentage of ripe rtages were noticed during March 1987 and spawning commenced in early
March. Oyaten showed 5.60% of apent stage8 with reridual eggs throughout the year except
August, September. December and February. Oyden panred through indoterminate atage before
the advance of gametogenesis. No hermaphrodites were observed during thin period
Not Available
Not Availableя╗┐Seanod changca in the gonad of edible oyrter Crassosma madmsensis were oberved hir-
tologically in samples colleated &om Korampallam creek during February 1987 to January 1988.
Two peak spawning reasons wore observed in March and September. Gametogenerir atarted in
May 1987 and ripe atagea wore noticed from September 1987. Spawning occurred during Sep-
tember to Ootober. A second cycle of gametogenerir began during November 1987 and higher
percentage of ripe rtages were noticed during March 1987 and spawning commenced in early
March. Oyaten showed 5.60% of apent stage8 with reridual eggs throughout the year except
August, September. December and February. Oyden panred through indoterminate atage before
the advance of gametogenesis. No hermaphrodites were observed during thin period.Not Availabl
Not Available
Not AvailableThe rate of removal of different microalgal cells in suspension at specific time interval in respect
of six species differing in sizes such as Tetraselmis sp, Cheatoceros sp, Chlorella sp, Dicrataria sp.,
Isochrys sp, Chromulina sp, by Crassostrea madrasensis has been studied. The study revealed that often exhibit a signifiant degree of selectivity in the rate of filtration of certain algae. Further it is recorded that the filtration rate is not uniform throughout the experimental period of 24 hours. Oysters showed periods of high filtering activity and periods of relative quiescence.Not Availabl