Abstract
Seven triplicate groups of fish (67 fish group-1) designated as T1, T2, T3, T4, T5, T6 and T7 were reared in fertilized
(0.17 g N 100-1 wet fish weight daily) earthen ponds (0.012 ha) for 365 days. There were five different fish species in
each of the triplicate group viz. Labeo rohita, Catla catla, Cirrhina mrigala, Ctenopharyngodon idella and
Hypophthalmichthys molitrix in the ratio of 27:10:10:07:13, respectively. Each triplicate group of fish T1 to T6 were fed
supplementary diets at varying protein level viz., 22, 24, 26, 28, 30 and 32% digestible protein (DP), respectively @
2% of their wet body weight daily. However, control fish (T7) although had an access to plankton; but were devoid of
the availability of any supplementary diet. Data on dry weights of plankton biomass and increase in fish yield were
collected on monthly basis and subjected to regression analysis in order to estimate the percentage contribution of
plankton biomass towards increase in fish yield. The correlation for plankton productivity v/s increase in fish yield was
positively significant (p<0.01) under all the treatments, showing the direct dependence of fish yield on plankton
productivity. The order of percentage contribution of plankton productivity towards increase in fish yield is T3 ≥ T4>
T1> T6> T7> T5> T2. Regression model developed for T1, T2, T3, T4, T5, T6 and T7 illustrated 63.40, 51.60, 64.50,
64.00, 52.20, 58.70 and 54.00% dependence of increase in fish yield on plankton productivity, respectively.
Jhan Zeb, Muhammad Javed. (2016) Forecasting percentage contribution of plankton biomass towards increase in fish yield under composite culture conditions, Punjab University Journal of Zoology, Volume 31, Issue 2.
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