Comparison of rice straw and bamboo stick substrates in periphyton-based carp polyculture systems

Abstract

An experiment was conducted to compare rice straw mat and kanchi (bamboo sticks) as substrates in periphyton-based polyculture systems. The experiment had three treatments: (a) no substrate (control), (b) rice straw as a substrate (3 Â 2.7 kg pond À1 ) and (c) kanchi as a substrate (390 kanchi pond À1 ). Fingerlings (n 5 40) of rohu, Labeo rohita (24.5 AE 0.5 g); mrigal, Cirrhinus mrigala (25.1 AE 0.6 g); catla, Catla catla (25.8 AE 0.5 g); common carp, Cyprinus carpio (27.6 AE 0.6 g), and silver carp, Hypophthalmichthys molitrix (30.4 AE 0.9 g) were stocked at a 3:2:2:2:1 ratio and cultured for 90 days. There were no di¡erences in the number of plankton, periphyton and macro-zoobenthos among the treatments. The total plate count of bacteria was higher in the rice straw treatment (41320 millioncfu m À 2 ) than that in the kanchi treatment (11780 million cfu m À 2 ). Growth and the ¢nal mean weight of rohu, catla and common carp were higher in the substrate treatments than those in the control. Rice straw and kanchi treatment, respectively, resulted in 38% and 47% higher combined total weight gain over control. Gross margin analysis showed that rice straw treatment resulted in more pro¢t than the control and kanchi treatment. Therefore, rice straw has the potential to be used to increase production in the low-input rural aquaculture.

Substrate based zooperiphyton communities and some physicocehmical features of Dhanmondi lake, Dhaka, Bangladesh

“…8% (Table 2) respectively. Similar results like the periphytic differences due to substrates observed by Wahab et al (1999), Rai et al (2008Rai et al ( , 2010 and Hosain et al (2011). Copepoda: Copepods constituted 6% of total zooperiphyton (Fig.…”

Periphyton communities in carp culture ponds treated with cow manure and biogas slurry

“…The periphytic forms are considered as both a trophic resource and indicator of the environmental conditions (Azim et al, 2005;Rai et al, 2008). The ponds were stocked with carp fingerlings with a stocking density at 5000/ha with daily manuring.…”

Potentiality of Periphyton-based Aquaculture Technology in Rice-fish Environment

“…Moreover it is expensive for marginal poor farmers. Rai et al [85] reported higher amount of periphytic bacteria on rice straw (41 320 million cfu m ). The stocked fishes (rohu, catla and common carp) in his experiment attained 38% and 47% higher combined total weight in substrate-based environment than to substrate free control.…”

“…The gross margin analysis showed that rice straw resulted in more profit than kanchi substrate type. Therefore, Rai et al [85] advocated the use of rice straw as the potential and low input substrate to be used to increase fish production in rural aquaculture. In Apatani Plateau, it was calculated out that the rice stems provide an additional surface area of more than 1000m 2 for the local cultivar 'amo' with stem diameter of 1.0-1.3cm submerged into 20-30cm water in the field.…”