Influence of low and high temperature on diurnal periodicity of tetraspore shedding in some red algae

Influence of low and high temperature on diurnal periodicity in tetrespore output from Gelidium pmillunt, Petwcladia heteroplatos and Gelidiopsis variabilis was investigated. In general, peak shedding of spores was delayed than the normal periodicity in G. pusillum and G. varia-bilis at low (0 and 20°C) as well as high (40°C) temperature. Temperature plays a major role in altering the peak liberation of tetraspores in a day in these three red algae

Prospects of seaweed farming in India

Seaweeds constitute one of the commercially important marine living renewable resources. They are used as human food, feed for animals, fertilizer for land crops, source of chemicals and drugs. The estimated total standing crop of seaweeds from intertidal and shallow waters of all maritime states, Lakshadweep and Andaman was 91,339 tons (wet wt.). The quantity of seaweeds estimated in deep waters of Tamilnadu was 75,373 tons (wet wt.) in an area of 1863 sq.km. from Dhanushkodi to Kanyakumari

Products from seaweeds

Seaweeds constitute one of the commercially important marine living renewable resources. They are the only source for the production of phytochemicals such as agar, agarose, carrageenan and algin which are widely used in various industries as gelling, stabilising and thickening agents. Seaweeds are good sources of food and medicine. Food products like jelly, jam, pickle etc. can be prepared from seaweeds. Many bioactive compounds can be extracted from seaweeds. Seaweed meal and seaweed liquid fertilizer are also' manufacture.d from marine algae. The methods for manufacturing different phyto-chemicals and products from seaweeds are given in this paper

Effects of environmental factors on diurnal periodicity of tetraspore output in some red algae of Visakhapatnam coast

Effects of environmental factors such ·as desiccat ion, salin it y, light aOO temperat ure on the diurnal period ic ity in liberation of tetraspores in Gelidium pusillum, Pterocla:1ia heteroplatos and Gelid iopsis vmiabilis were sh.died. Desiccation of ff OrdS, salinity ard continuous dark or light at different intensities had no effect on the diurnal periodicity in spore output in these three red algae. The temperature of sea wat er was the primary factor controll ing the peak output of spores. Peak liber ation of spores was delayed for 4-12 hr in a day in G. pusillum and G. variabilis when the temperature of sea water was below JO"C

समुद्री शैवाल संवर्धन- मछुआरों की आजीविका के लिए एक नया विकल्प

कृपया पूरा लेखा पढ

Marine plants of Mandapam coast and their uses

In the sea 3 types of plants occur and they arePhytoplanktons, Seaweeds or Marine Algae and Seagrasses. Phytoplanktons are microscopic and free floating forms and they are the primary producers of the sea. Seaweeds or Marine Algae are macroscopic, attached or free floating plants

केंद्रीय समुद्री मात्स्यिकी अनुसंधान संस्थान का मंडपम क्षेत्रीय केंद्र

केंद्रीय समुद्री मात्स्यिकी अनुसंधान संस्थान का मंडपम क्षेत्रीय केंद्

Seaweed biotechnology

Seaweeds or marine macro algae are primitive non-flowering plants without true root, stem and leaves. They form one of the commercially important marine living renewable resources. They are the only source for the production of phytochemicals such as agar, carrageenan and algin. Seaweeds occur in the intertidal, shallow and deep waters of the sea upto 180m depth and also in estuaries and backwaters. They grow on rocks, dead corals, stones, pebbles, solid substrata and on other plant

Seaweed potential and its exploitation in India

The potential areas in India for luxuriant growth of seaweeds are south Tamil Nadu coast, Gujarat coast, Lakshadweep and Andaman Nicobar Islands. The total standing crop of seaweeds from Intertidal and shallow waters of all maritime states and Lakshadweep Islands was estimated as 91339 tons (wet WI.) The quantity of seaweeds growing in deep waters ofTamiJ Nadu was estimated as 75372 tons (wet wt) in an area of 1863 sq km from Dhanushkodi to Kanyakumari. Data were collected every month from 1978 to 1995 from the seaweed landing centres in Tamil Nadu on the quantity of seaweeds exploited from the natural seaweed beds. During this period the quantity of agar yielding seaweeds Gelidiella acerosa, Graci/aria edulis, G. crassa and G. foliifera exploited in a year varied from 248 to 1289 tons (dry wt).; algin yielding seaweeds Sargassum spp and Turbinaria spp from 651 5537 tons (dry wt) and all the above seaweeds from 1177 to 6420 tons (dry wt). Since several years, agar yielding red algae are over exploited in Tamil Nadu. The need for conservat ion of commercially important seaweeds of Tamil Nadu and time - table for their commercial exploitation are given. The harvesting of under exploited and unexploited seaweeds from Tamil Nadu and unexploited seaweeds from other parts of Indian coast are suggested

Tropical Cyclones

The term 'Cyclone' derived from a Greek word meaning the coil of a snake, is used for tropical revolving storms occurring in the Bay of Bengal and the Arabian Sea. These storms are confined to definite regions of the earth and occur, for the most part, in the tropical portions of the western sides of the great oceans. The term cyclone is applied to all tropical storms although they are known as 'hurricanes' in the Atlantic and Eastern Pacific, as 'typhoons' in the Western Pacific, as 'willy willias' in the Australian Seas and as 'Baguios' in the Philippines