In this article we will discuss about:- 1. Meaning of Pearl Culture 2. Important Pearl-Producing Oysters 3. Distribution in Indian Waters 4. Biology of Pearl Oyster 5. Formation of Pearl 6. Artificial Pearl Culture 7. Large-Scale Pearl Culture. Meaning of Pearl Culture: Pearl is secreted by the mantle of marine bivalve molluscs, the pearl oysters (Fig.47.9). The Secretion is known [...]
In this article we will discuss about:- 1. Types of Breeds of Fowls 2. Methods of Rearing Birds 3. Diseases and their Management 4. Prevention and Treatment of Diseases. Types of Breeds of Fowls: The domestic fowl, Gallus domesticus, are descendants of wild fowl Gallus Gallus. The following breeds of fowls are common: 1. Asiatic breeds: Large-sized birds with feathered [...]
In this article we will discuss about the prawn culture in India. A. Important cultural prawns and their importance in fishery: A good number of prawn species are of commercial value. The following are important: a. Penaeus indicus (Fig. 47.8): Maximum size 230 mm. One of the most important commercial species. Young ones are fished in estuary. b. Penaeus monodon: [...]