Abstract
The study was conducted to assess the growth and survival of <em>Macrobrachium rosenbergii</em> in earthen culture ponds in order to know about the growth potential of <em>M. rosenbergii</em> in mono as well as polyculture conditions in Jammu. Polyculture experiments of prawn with some selected carps Indian Major Carps (<em>Cirrhinus mrigala</em> and <em>Labeo rohita</em>) and Exotic Carps (<em>Cyprinus carpio</em>) were undertaken in 3 freshwater ponds for duration of 4 months. Under the monoculture conditions, prawns attained an average size of 10.40 ± 0.17 cm weighing 23.84 ± 0.32 g in 4 months and the survival rate was found to be more than 75%. The growth rate of prawns was found to increase steadily during the first half (upto mid-October) after which a decline in the growth rate was evident as the mean temperature reached below 18°C. In the polyculture ponds the prawns attained an average size of 10.10 ± 0.03 cm weighing 18.39 ± 0.89g (without<em> C. carpio</em>) and 8.4 ± 0.36 cm weighing 15.23 ± 0.36 g (with <em>C. carpio</em>) in 4 months and their survival rate was less than 70%. Prawns being benthic feeders utilized the leftover food (of the fishes) that settled at the bottom, therefore, saving the feed cost. It was observed that mean size of the fish attained in the polyculture practice was almost similar to that obtained in the monoculture. The ideal prawn polyculture should be practiced with fast growing compatible carps such as Rohu and grass carp. Bottom feeder carps such as Mrigal (<em>C. mrigala</em>) should be avoided in prawn polyculture practice as they compete with prawns in feeding.
Highlights
Macrobrachium rosenbergii[1] is a freshwater prawn, commonly known as ‘Scampi’ or ‘giant freshwater prawn’ commonly distributed in fresh as well as in brackish water and estuaries[2]
Larvae of M. rosenbergii were stocked in three different ponds with different densities of carps (C. mrigala, L. rohita, C. carpio) keeping the density of prawns (M. rosenbergii) constant and each density was treated as treatment
Various growth parameters were estimated at weekly intervals in terms of Body Weight Gain (BWG), Percentage Weight Gain (%WG), Average Individual Body Length (AIBL), Total Length Gain (TLG), Average Individual Body Weight (AIBW), Specific Growth Rate (SGR), Feed Conversion Ratio (FCR), Feed Conversion Efficiency (FCE) and Survival by using the following formulae: TLG BWG (g) %WG (%)
Summary
Macrobrachium rosenbergii (de Man, 1879)[1] is a freshwater prawn, commonly known as ‘Scampi’ or ‘giant freshwater prawn’ commonly distributed in fresh as well as in brackish water and estuaries[2]. Reported that M. rosenbergii is one of the most desirable candidate species for freshwater aquaculture in different parts of the Indo-Pacific region. The breakthrough in its seed production and larval rearing technology has led to a new wave of enthusiasm among the prawn farmers for its monoculture and polyculture along with fish species like catla (Catlacatla), rohu (Labeo rohita) and mrigal (Cirrhinus cirrhosus). Dayanum[16,17,18,19,20] and establishment of M. rosenbergii for the last 8 to 9 years in Jammu[21,22] first attempt has been made to study the growth of M. rosenbergii under mono and polyculture conditions in earthen ponds of Jammu region, the Northern part of India
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