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ABSTRACT:
Presence of predatory and weed fishes in fish cultured pond is also serious problem due to their faster growth rate and better utilization of food and cultured carp habitat. Due to their carnivorous nature they engulf the finger lings of cultured crops and adversely affect the aquaculture production. The WHO and FAO have tested several thousand synthetic compound for the control of weed and predatory fishes through these pesticide so for not provide them self to be entirely satisfactory with a growing awareness of environmental pollution, effort are being made to find out piscicidal product from plant origin. Being product of bio synthesis, these are easily biodegradable in nature. Exposure to 96 hour of fish with sub lethal doses (40% and 80% of LC50, 24h) of latex powder of Nerium indcum caused significant (P<0.05) decrement in the level of total protein, glycogen and nuclic acids and enhancement in level of total free amino acid and activity of enzyme proteases. The reversibility in action and non-toxic effect on mammals are the important positive feature of these botanical piscicides, which reduce the threat of environmental pollution.
KEY WORDS: Predatory fish, Piscicide, Glycogen, Channa punctuates, Nerium indcum, Proteases.
INTRODUCTION:
In country like India the intake of meat and milk is low so fish has special importance as a supplement to ill balanced cereal diets. Today protein deficiency is the world's most serious human multi nutritional problem and perhaps 30 to 40% of the world population is suffering from protein deficiency. It is estimated that about 10 million tons of fish required annually meeting the present day demand of fish protein in the country against an animal production of only 35 million tons (Shukla and Upadhyay, 2008).
Fish production in India has increased at a higher rate compared to food grains, milk, eggs and other food items. India ranks second in the world fish production with an annual fish production of about 6.9 million metric tons (Economic Times, 2007). Fisheries sector contributed Rs. 34,758 crores to the GDP during 200506, which was 1.2% of the national GDP and to 5.3% of the agricultural GDP. However, the share of fisheries sector in the State Domestic product was estimated to be 1.44% in 2005-06 (Economic Survey, 2007). There has...