पिंजरा मछ्ली पालन केलिए प्लवकी खाद्य का निर्माण

कृपया पूरा लेखा पढ

गुजरात के सूत्रपादा और दिऊ के घोघला में समुद्री पिंजरों में शूली महाचिंगट पानुलिरस पोलिफागस का पालन

Sea cage culture of spiny lobster Panulirus polyfagus at Sutrapada, Gujarat and Di

पिंजरों में मछली पालन की भौगोलिक स्थिति – एक अवलोकन

कृपया पूरा लेखा पढ

Artificial Reefs and its Importance in Marine Fisheries Management

Nowadays the need for artificial reefs is growing in India, since the fishery resources of the inshore areas are being intensively exploited. There is a considerable increase in the fishing effort, especially by mechanised vessels all along the Indian coast. Heavy competition among different kinds of fishing vessels has led to reduced incomes and moreover, in a multi species fishery, management measures like seasonal fishing ban adopted for conservation will have a limited effect. In this context, artificial reefs as a device for increasing the fish biomass gets importance

Length weight relationship and condition factor of Penaeus monodon (Fabricius, 1798) from Digha coast, West Bengal, India

The Indian Tiger prawn Penaeus monodon Fabricius 1798 is the largest species among the penaeid prawns and is commonly known as “Jumbo Tiger Prawn” in the Indo-Pacific region (Rao, 2013) [23]. In West Bengal it is known as Bagda chingdi. It is widely distributed in the Indian waters but forms a substantial component of the prawn landings from the sea and the estuaries of the east coast. P. monodon has been recorded in all the maritime states of India (Mohamed, 1970) [18]

Assessment of nitrogen and sulphur cycle bacteria and shrimp production in ponds treated with biological products

Objective: To study the influence of biological products on the levels of nitrogen and sulphur cycle bacteria in shrimp culture systems of West Bengal, India. Methods: The pond water and sediment samples were analyzed for physico-chemical parameters as per standard methods. The bacteria involved in ammonification, nitrification, denitrification, sulphate reduction and sulphur oxidation were enumerated by most probable number technique. Results: The semi-intensive and modified extensive shrimp farms used a variety of biological products during various stages of production. No biological products were used in traditional farms. The water and sediment samples of modified extensive system recorded significantly higher mean heterotrophic bacterial counts. The counts of ammonia, nitrite and sulphur oxidizers, and nitrate and sulphate reducers varied among the systems. The cycling of nitrogen and sulphur appeared to be affected with the intensification of culture practices. Conclusions: The application of biological products in certain systems helped to maintain the bacteria involved in nitrogen and sulphur cycles and safe levels of ammonia, nitrite and nitrate. An assessment of these metabolically active bacteria in shrimp culture ponds and the application of right kind microbial products would help ameliorate the organic pollution in shrimp aquaculture

Aquaculture of spiny lobsters in sea cages in Gujarat, India

A total of 2,256 juveniles of the mud spiny lobster, Panulirus polyphagus with a mean carapace length of 40.44 mm and mean body weight of 67.83 g after acclimatization for a period of twelve weeks in 8000 litres FRP tanks were stocked in open sea cage near Veraval on the coast of Gujarat, India at a density of 12.4 m-3. The lobsters were fed twice daily with fresh fish and mollusc meat at 10% of lobster biomass per day. Monitoring of the water quality parameters in the vicinity of the cage found that they were well within the favourable ranges for shellfish culture indicating that the cage has not made any adverse impact on the local environment. The lobsters were harvested from the cage after 120 days at a mean wet weight of 212.65 g. Survival was 86.1 %. The results of this preliminary experiment indicate that there is commercial potential for the development of sea cage culture of Panulirus polyphagus in Gujarat

Microcosm evaluation of indigenous microflora of traditional shrimp farming system as bioremediators

The ability of indigenous microflora of traditional shrimp farming system to remove ammonia was evaluated under laboratory conditions. The indigenous microflora in combination were capable of removal of total ammoniacal nitrogen (TAN) to the tune of 85 - 99% within a week. The activity of nitrifying bacteria was observed to be substrate dependent. The results revealed that the TAN removal rate was affected by high initial TAN concentration and varied microbial activity. The results of the present study would release new avenues for future research and refinement of techniques on bioremediation in shrim