Recent advances in the hatchery production of seed of some commercial bivalves in India

The Central Marine Fisheries Research Institute has established a shellfish hatchery laboratory at its Tuticorin Research Centre with the objective of developing appropriate technology for the production of seed of commercial bivalves. A viable technology was developed for the mass production of the seed of Pinctada fucata, P. margaretifera, Crassostrea madrasensis, Perna indica, P. viridis, Anadara granosa and Meretrix meretrix. The hatchery facility and the technology, comprising brood stock conditioning, induced spawning, larval rearing and seed production are described. In the light of these developments the future outlook is appraised

The windowpane oyster resources of Kakinada Bay

Among the commercially exploited bivalve mollmcs in India the windowpane oyster Placenta placenta (Uniiaeus) (Talapu gulla in Telugu) is next in importance to the clams in quantitative abundance. A major fishery for this species exists in the Kakinada Bay where the annual production is about 50001. Production is about 1500 t/year of empty shells in the Kndhara Bay in the Gulf of Kutch and about 350 t/year in Naukim Bay at Goa. In the fishery at Kakinada Bay about 300 plank-built boats are deployed. This species occurs in stray numbers at several other centres along the Indian Coast. Considerable quantities of the shell are also collected from the subsoil deposits, particularly from the Vembanad Lake in Kerala State

Technology of mollusc culture

THE molluscs are an important group of shellfish and are exploited along the Indian coasts. Their meat is used as food; the shell is an important raw material in lime based industries and also in making curios. In temperature countries culture of molluscs such as oystelS, clams, mussels scallops and abalones is widely practised to augment production. In India, technologies for fanning several species of molluscs have been developed during the past two decades, mainly due to the efforts at the Central Marine Fisheries Research Institute (CMFRl)

Technology of cephalopod scallops and abalone culture

Our- present knowledge on cephalopod culture is limited to rearing of t he squid/cuttlefish from egg to maturity in tanks or ponds and commercial culture is not practised anywher

Fishery and biology of clam and cockles

The most productive areas are the Kalbadevi estuary and Bhatia creek in Ratnagiri District. Torkarli creek south of Malwan is also important. Clams are collected by men, women and children at low ntide by hand picking . Canoes and rake nets are also use

Kakinada Bay fisheries - Nostalgic memories

In 1978 work was initiated to culture the -blood clam Anadara granosa in the Bay. A 100 m2 area was selected, an elderly clam fisherman from the village was entrusted with the watch and ward. Wide publicity was given in the village to create awareness. In the evening, the site was fenced with dry palmyra leaves (to serve as pen enclosure). Nylon netting was not preferred due to possible poachin

Modeling and analysis of chemiluminescence sensing for syngas, methane and jet-A combustion

Flame chemiluminescence has received increasing attention for its potential sensor and diagnostic applications in combustors. A number of studies have used flame chemiluminescence to monitor flame status, and combustor performance. While most of these studies have been empirical in nature, chemiluminescence modeling has the potential to provide a better understanding of the chemiluminescence processes and their dependence on various combustion operating conditions. The primary objective of this research was to identify and validate the important chemiluminescence reaction mechanisms for OH*, CH* and CO2*. To this end, measurements were performed at various operating conditions, primarily in laminar, premixed flames, fueled with methane, syngas (H2/CO) and Jet-A. The results are compared to 1-d laminar flame simulations employing the chemiluminescence mechanisms. The secondary objective was to use the experiments and validated chemiluminescence reaction mechanisms to evaluate the usefulness of flame chemiluminescence as a combustion diagnostic, particularly for heat release rate and equivalence ratio. The validation studies were able to identify specific mechanisms for OH*, CH* and CO2* that produced excellent agreement with the experimental data in most cases. The mechanisms were able to predict the variation of the chemiluminescence signals with equivalence ratio but not with pressure and reactant preheat. The possible reasons causing this disagreement could be due to the inaccuracies in the basic chemical mechanism used in the simulations, lack of accurate quenching data (for CH*), thermal excitation (for OH*) and radiative trapping (for OH* and CO2*) and interference from the emissions of other species (such as HCO and H2O), for CO2*. Regarding the utility of chemiluminescence for sensing, a number of observations can be made. In syngas-air flames, CO2* is a reasonable heat release rate marker, at least for very lean conditions. OH* shows some advantage in atmospheric-pressure methane and Jet-A flames in general, while CH* is advantageous at high pressure and very lean conditions at atmospheric pressure. The CO2*/OH* intensity ratio is not useful for sensing equivalence ratio in syngas flames, except maybe at very lean conditions. However, the CH*/OH* signal ratio is a promising approach for sensing equivalence ratio at low or very high pressure conditions in hydrocarbon flames. Thermal excitation and self-absorption processes for OH* chemiluminescence can become important for combustors operating at high pressure, high preheat and near stoichiometric conditions. Background subtracted chemiluminescence signals are recommended for sensing purposes.Ph.D.Committee Chair: Seitzman, Jerry; Committee Member: Jagoda, Jechiel; Committee Member: Lieuwen, Tim; Committee Member: Menon, Suresh; Committee Member: Docquier, Nicolas; Committee Member: Huey, Gregory

Studies on some aspects of biology and fishery of the cockle, Anadara granosa (Linnaeus), from Kakinada bay

Age and growth of A,granosa has been studied by an examination of the size-frequencies of random samples for the period from April 1965 to September 1966. The cockles measure 31 -5 mm. in length at the end of the first year and 49.3 mm. at the end of the second year of life. No growth rings were noticed to be of use in age determination. The commercial catches chiefly consisted of '0' and 1 + age groups in the year April 1965 to March 1966. The cockles reach sexual maturity when they measure 21 mm. and about 7 months old. They appear to breed throughout the year. There is a peak spawning activity in January- April period. The length-weight relationship has been studied

Technology of clams and cockles culture

Good numbers of clams are at present cultivated in a number of countries. It my be seen that clam/cockle culture is extensively practised in Japan, Korea, Taiwan, Malaysia and Thailand