Effects of stocking densities of tilapia Oreochromis niloticus (Linnaeus, 1758) with the inclusion of silver carp Hypophthalmichthys molitrix (Valenciennes, 1844) in C/N-CP prawn Macrobrachium rosenbergii (De Man, 1879) culture pond

2018 ◽  
Vol 26 (2) ◽  
pp. 523-541 ◽  
Author(s):  
M. Rezoanul Haque ◽  
M. Ashraful Islam ◽  
Zohura Khatun ◽  
Md Afzal Hossain ◽  
Md Abdul Wahab
Keyword(s):  
Oreochromis Niloticus ◽  
Silver Carp ◽  
Macrobrachium Rosenbergii ◽  
Hypophthalmichthys Molitrix ◽  
De Man

scholarly journals Potential and Economic Viability of Freshwater Prawn Macrobrachium rosenbergii (de Man, 1879) Polyculture with Indian Major Carps in Northwestern Bangladesh

Our Nature ◽  
1970 ◽  
Vol 9 (1) ◽  
pp. 61-72 ◽  
Author(s):  
S. Jasmine ◽  
M. Molina ◽  
M.Y. Hossain ◽  
M.A.S. Jewel ◽  
F. Ahamed ◽  
...  
Keyword(s):  
Silver Carp ◽  
Macrobrachium Rosenbergii ◽  
Economic Feasibility ◽  
Freshwater Prawn ◽  
Catla Catla ◽  
Hypophthalmichthys Molitrix ◽  
Indian Major Carps ◽  
Northwestern Bangladesh ◽  
De Man ◽  
Major Carps

This study was conducted to assess the aquaculture potential of the freshwater prawn Macrobrachium rosenbergii (de Man, 1879) with the Indian major carps (Catla, Catla catla; Rui, Labeo rohita and Mrigal, Cirrhinus mrigala) and silver carp, Hypophthalmichthys molitrix in northwestern Bangladesh. Further, the effect of the culture system on overall production and economic feasibility was evaluated. A 3×2 (treatment×replicate) experimental setup was conducted using six earthen ponds measuring 100 m2 each for a culture period of six months from September, 2007 to February, 2008. The treatments were as follows: T1 was stocked with only carps (catla, rohu, mrigal and silver) at the 3000 (catla), 2000 (ruhu), 3000 (mrigal) and 2000 (silver) ha-1; T2 and T3 were stocked with catla and silver carp were 3000 and 2000 ha-1, respectively; and additionally M. rosenbergii (juvenile) was stocked at 15000 and 20000 ha-1 in T2 and T3, respectively. All the ponds were subjected to the same fertilization treatment. Fish were fed twice per day at a rate of 5-12% of the prawn and fish body weight. The net weight gain of catla and silver carp were 69.08±11.63 and 108.67±15.00 g in T1, 61.76±12.58 and 98.80±17.05 g in T2, while 58.11±12.51 and 93.09±14.84 g in T3, respectively. The mean individual weight of harvested prawn was significantly higher in T2 (14.61±02.06 g) than T3 (14.04±01.83 g) (P<0.05). Also the survival rate of prawn was higher in T2 (74.15%) than T3 (69.25%) (P<0.05). The net production of prawn was higher in T3 (1141.28±46.35 kg ha-1) than T2 (964.54±25.53 kg ha-1), but the specific growth rate was significantly higher in T2 (2.07%) than T3 (1.99%) (P<0.05). Higher profit was obtained in T3 (35682.18 Tk ha-1) than T1 (8537.53 Tk ha-1) and T2 (30801.56 Tk ha-1); however, cost-benefit ratio (CBR) was significantly higher in T2 (3.19) where stocking densities of prawn was 15000 ha-1 than T1 (2.92) and T3 (2.47). The results of this experiment indicate that the polyculture of the freshwater prawn with the Indian major and Chinese carp present a more profitable venture which is more economically feasible than the monoculture of the freshwater prawn.DOI: http://dx.doi.org/10.3126/on.v9i1.5735

Impact of Feeding Activity of Silver Carp on Plankton Removal from a High-Rate Pond Effluent

2005 ◽  
Vol 40 (2) ◽  
pp. 191-201 ◽  
Author(s):  
Nadia Berday ◽  
Driss Zaoui ◽  
Abdeljaouad Lamrini ◽  
Mustapha Abi
Keyword(s):  
Feeding Activity ◽  
Silver Carp ◽  
Treatment Plant ◽  
High Rate ◽  
Fish Pond ◽  
Gut Contents ◽  
Hypophthalmichthys Molitrix ◽  
Technology System ◽  
Solids Concentration ◽  
Plankton Communities

Abstract The effect of silver carp (Hypophthalmichthys molitrix Val.) feeding activity on the plankton communities in a high-rate pond technology system (HRPTS) effluent was investigated over a period of 100 days. The experiment was conducted at the experimental wastewater treatment plant of the Agronomic and Veterinary Medicine Institute (AVI) of Rabat, Morocco, using a HRPTS in a fish pond receiving the plant effluent. The effluent was highly dominated by phytoplankton (99.95%). Silver carp could survive and grow in the fish pond. Production was 37 kg with a very low mortality rate (12%). The high specific intestine weight (7%) and intake rates of biomass and phytoplankton by silver carp (616 g kg-1 of fish day-1 and 1.6 x 1011 cell kg-1 of fish day-1, respectively) demonstrated the importance of the feeding activity of the fish. Zooplankton intake rates were lower (2 x 107 bodies kg-1 of fish day-1). The high intestine index (3 to 4.3 for fish sizes of 14 to 22 cm) and the dominance of phytoplankton in the gut contents (99.95%) confirmed an omnivorous/ phytoplanctivorous diet. Silver carp were efficient in removing plankton from the HRPTS effluent. The net removal yields of biomass were 285 g m-3 day-1 and 322 g kg-1 of fish day-1, 7 x 1010 algal cells kg-1 of fish day-1 and 8.7 x 107 zooplankton bodies kg-1 of fish day-1, with net removal rates of 47, 64 and 62%, respectively. The total suspended solids concentration decreased from 211 in the inflow to 112 mg L-1 in the fish pond.

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