Primary Productivity of Phytoplankton, Environmental Covariates and Fish Growth in West Bengal Ponds under a Polyculture System
✍ Scribed by B. B. Jana; U. K. De
- Publisher
- John Wiley and Sons
- Year
- 1983
- Tongue
- English
- Weight
- 766 KB
- Volume
- 68
- Category
- Article
- ISSN
- 1434-2944
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✦ Synopsis
Measurements of primary production by phytoplankton in four fish ponds over a period of one year revealed a distinct spatial variation in rate. The ponds were usedfor polyculture, monoculture, or a traditional system of fish culture. The rates of gross photosynthesis were highly correlated with temperature, free CO,, oxygen, inorganic nitrogen (NH:, NO;, and NO,) and P 0 4 -P . It was shown by step-wise multiple regression analysis that in the polyculture pond with a predominantly autotrophic metabolism, gross photosynthesis was the most significant factor correlated with fish growth. I n another polyculture system in which the metabolism was mainly heterotrophic, the influence of the photosynthesis rate was slight.