Give merits and demerits of fish culture.
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advantages:
Increase in organic fertilization by fish excreta and remains of artificial feed.Better tillering of the rice seedlings due to the activity of the fish.Reduction in the number of harmful insects, such as paddy stem borers, whose larvae are eaten by fish.Reduction in rat population due to increase in the water level.Increased mineralization of the organic matter and increased aeration of the soil resulting from the puddling of mud by benthic feeders.Control of algae and weeds (by phytophagons fish) which compete with rice for light and nutrients.disadvantages:
Increase in organic fertilization by fish excreta and remains of artificial feed.Better tillering of the rice seedlings due to the activity of the fish.Reduction in the number of harmful insects, such as paddy stem borers, whose larvae are eaten by fish.Reduction in rat population due to increase in the water level.Increased mineralization of the organic matter and increased aeration of the soil resulting from the puddling of mud by benthic feeders.Control of algae and weeds (by phytophagons fish) which compete with rice for light and nutrients.
Increase in organic fertilization by fish excreta and remains of artificial feed.Better tillering of the rice seedlings due to the activity of the fish.Reduction in the number of harmful insects, such as paddy stem borers, whose larvae are eaten by fish.Reduction in rat population due to increase in the water level.Increased mineralization of the organic matter and increased aeration of the soil resulting from the puddling of mud by benthic feeders.Control of algae and weeds (by phytophagons fish) which compete with rice for light and nutrients.disadvantages:
Increase in organic fertilization by fish excreta and remains of artificial feed.Better tillering of the rice seedlings due to the activity of the fish.Reduction in the number of harmful insects, such as paddy stem borers, whose larvae are eaten by fish.Reduction in rat population due to increase in the water level.Increased mineralization of the organic matter and increased aeration of the soil resulting from the puddling of mud by benthic feeders.Control of algae and weeds (by phytophagons fish) which compete with rice for light and nutrients.
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Answer:
merits...
- quality and quantity of desired fish can be increased
- fish being chief source of animal protein are quality food in itself
- fish culture provides good economic value
demerits...
- only canonically valued fish are cultured
- the selection of fish for culture may be a threat to biodiversity...
hope this helps u....
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