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Primary Productivity of Phytoplankton, Environmental Covariates and Fish Growth in West Bengal Ponds under a Polyculture System
Author(s) -
Jana B. B.,
De U. K.
Publication year - 1983
Publication title -
internationale revue der gesamten hydrobiologie und hydrographie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 52
eISSN - 1522-2632
pISSN - 0020-9309
DOI - 10.1002/iroh.19830680104
Subject(s) - polyculture , monoculture , phytoplankton , productivity , photosynthesis , trophic level , biology , ecology , fishery , fish <actinopterygii> , botany , aquaculture , nutrient , macroeconomics , economics
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 used for polyculture, monoculture, or a traditional system of fish culture. The rates of gross photosynthesis were highly correlated with temperature, free CO 2 , oxygen, inorganic nitrogen (NH 4 + , NO 2 − , and NO 3 − ) and PO 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. In another polyculture system in which the metabolism was mainly hetero‐trophic, the influence of the photosynthesis rate was slight.