Density effects of silver carp Hypophthalmichthys molitrix and catla Catla catla on the production system in all‐male freshwater prawn–finfish polyculture ponds |
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Authors: | Sheikh Md. Shamsur Rahman Md. Abdul Wahab Mrityunjoy Kunda Md. Ashraful Islam Md. Ekram Azim |
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Affiliation: | 1. Department of Fisheries Management, Bangladesh Agricultural University (BAU), Mymensingh, Bangladesh;2. Department of Physical and Environmental Sciences, University of Toronto, Toronto, ON, Canada |
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Abstract: | The effects of three different combinations of silver carp Hypophthalmichthys molitrix and catla Catla catla density on the production system in all‐male freshwater prawn–finfish polyculture ponds were evaluated in triplicate. The stocking density of silver carp and catla, respectively, were maintained at 2000 and 500 ha?1 in treatment SC2000C500, 1500 and 1000 ha?1 in treatment SC1500C1000 and 1000 and 1500 ha?1 in treatment SC1000C1500. Male freshwater prawn Macrobrachium rosenbergii and small fish mola Amblypharyngodon mola densities were fixed in all treatments at 12 000 and 20 000 ha?1 respectively. Management practices were same for all treatments. Blue‐clawed male prawns were harvested twice during the 122‐day culture at 15‐day intervals before the final harvest. Plankton and macro‐benthos abundance and water quality parameters (except transparency and chlorophyll a) did not vary significantly (P>0.05) among treatments. Mean final weights of both silver carp and catla were decreased with the increasing of their own stocking density. The treatment SC1500C1000 resulted in 25–32% increased net production of silver carp plus catla (461 kg ha?1) and 20–21% increased net production of all species combined (874 kg ha?1) as compared with the other treatments, although the differences in production of prawn and mola among treatments were not significant. |
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Keywords: | all‐male freshwater prawn silver carp catla mola polyculture stocking density |
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