Effects of paddy straw and sugarcane bagasse on water quality, bacterial biofilm production and growth and survival of rohu, Labeo rohita (Hamilton)

Abstract

Sugarcane bagasse (T1), paddy straw (T2) and their mixture (T3) were added to mud‐bottomed, manured cement tanks in triplicate to study the effect on bacterial biofilm production and growth and survival of rohu, Labeo rohita. All tanks were stocked with fingerling rohu at 10 000 ha−1. The total plate count (TPC) of bacteria in water and on substrate did not differ significantly between treatments. The mean phytoplankton and zooplankton density in water was the highest in T2, followed by T3 and T1. The growth of fish was significantly (P<0.05) higher in T2 and T3 compared with T1. Significantly higher RNA values were recorded in T2 and T3 compared with T1. Similarly, T2 and T3 registered higher DNA values than T1. RNA:DNA ratio was higher in T2 compared with T1. However, T3 did not differ significantly from T1 and T2. Both intestinal and hepatopancreatic protease and lipase activity was higher in T1 and T2 compared with T3 and both differ significantly from T1. Intestinal amylase activity was higher in T2 and T3 compared with T1, whereas hepatopancreatic amylase activity was higher in T2 compared with T1 and T3. The results demonstrated that production of L. rohita can be significantly increased by the introduction of biodegradable substrates into culture systems where fertilization is employed.

Effect of paddy straw and sugarcane bagasse on growth and survival of giant freshwater prawn Macrobrachium rosenbergii (de Man, 1879)

“…In general, protease activity in the intestinal segments is higher than that in hepatopancreas. Bazaz and Keshavanath (1993), Manjappa (1999) and Mridula et al (2003Mridula et al ( , 2005 reported similar observations in Tor khudree, Catla catla, Labeo fimbriatus and Labeo rohita respectively. Dietary protein content is known to effect protease activity (Mukhopadhyay et al, 1978;Phadate, 1987;Gangadhar et al, 1997;Mridula et al, 2003Mridula et al, , 2005.…”

“…Ammonia, nitrite, nitrate, phosphate and alkalinity values recorded in the present study were generally within the suitable limits for fish culture (Azim, 2001;Mridula et al, 2005). Substrate-based treatments recorded lower ammonia and nitrite and higher nitrate concentrations than the control.…”

“…Microbial biofilm on substrates in aquatic system plays an important role in enhancing fish production (Ramesh et al, 1999;Umesh et al, 1999;Mridula et al, 2005;Rajesh et al, 2008;Gowda et al, 2012;Milstein et al, 2013). Importance of substrates in the culture of shrimp and freshwater prawn is very well recognised (Tidwell et al, 1999;Uddin et al, 2007).…”

Periphyton Growth on Three Bio-substrates and Its Influence on the Performance of Jaraqui (<i>Semaprochilodus insignis</i>)

“…In recent years, periphyton-based fish culture is developing as an alternative to systems with low input supplemental feeding, due to the high cost of artificial diets. It results in increased fish/prawn production (Mridula et al, 2005;Jana et al, 2006;Garg et al, 2007;Asaduzzaman et al, 2010, Keshavanath et al, 2015Bharti et al, 2016;Shilta et al, 2016;Tortolero et al, 2016;Kumar et al, 2017), simultaneously addressing environmental concerns through effective recycling of nutrients from the aquatic system. Higher fish yield from such systems is enabled by the nutritional contribution of periphyton growing on the substrates and also better survival since substrates act as shelters for fish.…”

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“…(Gangadhar and Keshavanath, 2008). Studies aimed at determining the efficiency of substrate type in the production of periphyton have tested biodegradable substrates such as bamboo, sugarcane bagasse, rice straw, palm leaf, coconut leaf and arecanut leafsheath as well as non-biodegradable substrates like tyre, ceramic tile, PVC pipe and glass slide (Mridula et al, 2005;Gangadhar and Keshavanath, 2008;Keshavanath et al, 2012Keshavanath et al, , 2015.…”