431 research outputs found
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рдХреГрдкрдпрд╛ рдкреВрд░рд╛ рд▓реЗрдЦрд╛ рдкрдв
Larval and juvenile rearing of the sand lobster Thenus orientalis Lund, 1793- Winter School on Recent Advances in Breeding and Larviculture of Marine Finfish and Shellfish
Over the last fifty years, global aquaculture production has undergone remarkable changes, with production
scaling up from less than a million tonnes in the early 1950s to 48.1 million tonnes in 2005. China contributed to 67.3%
of the production, followed by India with 5.9%. Aquaculture now accounts for nearly 45% of the worldтАЩs food fish supply,
and this share is expected to reach 50% in 2015 (FAO, 2007). Mariculture is a relatively virgin field with continuous
scope for diversification and its ultimate aim is always to enhance high value sea food production through ecofriendly,
cost-effective technologies. The present annual mariculture production in India is about 7000t, which is estimated to
reach about 1 lakh tonnes in 2020
Open sea cage farming of Asian sea bass Lates calcarifer in the Bay of Bengal, off Chennai- National Training on Sea cage farming- 2010
Controlled captive culture of fin fishes
in open water bodies (seas, reservoirs, lakes)
is mostly done in pens and cages. Open sea
cage culture of the Asian sea bass Lates
calcarifer ,was carried out for the first time in
the Bay of Bengal off Chennai by CMFRI during
February - August 2010. The execution of the
programme began with the fabrication of
suitable cages with proper accessories,
identification of site, procuring and nursery
rearing of seed, transportation and stocking of
fingerlings and open sea rearing till harves
Thompson & Bell prediction model
Prediction or predictive models predict the effect of different levels of fishing effort on the
fish stocks in the future. Two prediction models that are widely applied are Thompson and
Bell (1934) model and the Yield per recruit model developed by Beverton and Holt (1957).
These models provide a direct link between fish stock assessment and fishery resource
management. The Thompson & Bell Model is a widely used prediction model in assessing
the optimum factor for increase or decrease of fishing effort to achieve maximum sustainable
and economic yield of a commercially exploited species. This model builds on the output of
age (as conceived in the original model) or length-based Virtual Population Analysis (VPA).
The equations used for the VPA and cohort analysis can be transformed to predict future
yields and biomass at different levels of fishing efforts; i.e., the knowledge of the past fishery
can be used to predict the future yields
Culture potential of the sand lobster Thenus orientalis (Lund)
Complete larval development of the scyflarid lobster Thenus orientalis was achieved for the first time in India at the Kovalam Field Laboratory of CMFRI. There has been only one other earlier report of a similar achievement in T. orientalis from Australia. Sub-adult male and female T. orientalis collected from the wild matured and mated in captivity Larvae (phyflosoma) were reared in treated seawater of salinity 37-39 ppt and pH 8-8.2 and fed on a combination of fresh clam meat and live zooplankto
Broodstock development and captive breeding of sand lobster Thenus orientalis lund, 1793- Winter School on Recent Advances in Breeding and Larviculture of Marine Finfish and Shellfish
Lobsters are among the largest marine arthropods, with a long life span. They are slow growing animals with a
complicated and prolonged life cycle, which greatly increases the risk of stock depletion through indiscriminate
fishing. Sand lobsters are known to inhabit the open unconsolidated sediments between the coast and
adjacent reefs and further beyond. These animals prefer soft, muddy beds. They are nocturnal feeders, with
specific predatory feeding habits. Unlike the spiny lobsters, they swim actively and cover large distances while
foraging for food. Gross morphological modifications including dorsoventral compression of the body, lateral
expansion of carapace and extreme reduction of antennae and body spines have resulted in a well
streamlined, energy-efficient swimming shape. An insight into the reproductive biology of an animal is a preliminary
requisite for broodstock development and breeding in captivity. The intricate processes underlying the actual
phenomenon of propagation of a species usually begin at the formative phase of the individual. They however
manifest as visible changes at a later phase of growth, commonly acknowledged as the тАЬadultтАЭ or тАЬsexually
matureтАЭ phase. These processes include a number of anatomical, physiological, morphological and behavioral
changes
Hatchery Technology and Seed Production of Lobsters
Lobsters are high-value seafood delicacies commanding high demand in international markets, with a high
culinary value attached and lobster tails are always in great demand world-wide. Freshwater crayfishes, which
are considered a delicacy in many parts of the world, are a favourite aquaculture candidate in North America,
Europe and Australia. Crayfish and rock lobster aquaculture practices are initially capital oriented but deliver
high production and income turnover in the long run. This industry has already taken off in countries like the
U.S.A. and Australia. The lobster fishery in India is supported by two groups of lobsters тАУ the spiny lobsters
(Palinurus homarus, P. polyphagus, P. ornatus and P. versicolor) and the scyllarid lobster (Thenus unimaculatus).
Lobster culture in India is still in the infancy stage. With the distinction of being perhaps, the only seafood
resource in IndiaтАЩs trade economy, which remains relatively low down the ladder in terms of quantity of
production but brings in maximum foreign exchange, lobsters have been the subject of study for more
than two decades now and C.M.F.R.I. has been spearheading research in the development of culture technologies
for different species of lobsters
Sand Lobster Thenus unimaculatus (Burton and Davie 2007)
Sand lobster is distributed in Indian Ocean from West to East and is one of the most promising
candidates for lobster aquaculture in India
Black porpoise Neophocena phocaenoides, G. Cuvier landed in a dol net at Seemar, Gujarat
A black porpoise, Neophocaena phocaenoides Gi Cuvier was caught in a dol net operating off Seemar bunder, Gujarat. The animal is locally called "Gonio." Local enquiry revealed that though there is no regular or targeted fishery for dolphins or porpoises, there have been stray occurrences of these mammals being captured by dol nets operated in the area. The nets {16 m long) are usually operated at a depth of 8 m. The locals utilize the oil extracted from these animals for application on their wooden boats
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