ന്യൂസ്‌ അപ്പ്‌ഡേറ്റ്

VHS: a vesceroptropic disease of young fishes An acute to chronic vesceroptropic disease of young (fingerling to yearling) rainbow trout at 10 0 C or lower. Also in adult trouts and salmonids, but not usual. Etiology: VHSV (Viral Haemorrhagic Septicemia Virus) Viral characteristics: Bullet-shaped rhabdovirus, enveloped. Length- 180 nm, width- 70-85 nm, apical end rounded, other end flat. ss RNA, replication in cytoplasm. Sensitive to lipid solvents, detergents and proteolytic enzymes. Distribution: Trouts farms in European countries: Denmark, Italy, Germany, Switzerland and Spain (not in UK and USA). Signs and pathology: Acute: Poor feeding. High mortality. Dark skin, exophthalmia. Pale gills, anaemia. Widespread internal haemorrhages in skeletal muscles and viscera. Hyperemic and swollen kidney and liver. Empty intestine. Hemorrhages in muscle and kidney. Focal necrosis in liver. Chronic: Low mortality. Dark skin. Exophthalmia. ...

Do You Know? (Fisheries Facts) Blue wheal is the largest animal of the world reaching up to 10 m. The oarfish ( Regalecus glesne ) is the world’s largest teleost, reaching lengths of 8 m to as much as 12 m. Whole specimen are rare. Whale shark is the largest fish. Most sharks are harmless- at least to humans. Nevertheless, 25 species of sharks are known to have attacked humans, and at least 12 more are suspected of doing so. Three are particularly dangerous- the great white, tiger and bull sharks. Shark jaws display triangular teeth and rows of spears. Each tooth has even small teeth along its edges. It has been estimated that a tiger shark may grow and discard 24,000 teeth in a 10 year period! The whale shark ( Rhiniadon typus ) usually feed by staining plankton from huge mouthfuls of water. It has probably evolved a huge mouth and lost the large teeth of most other sharks not to avoid competition with other sharks but as a specialization for plankton feeding. Pois...